Cosmic Microwave Background - Science topic

Primordial gravitational waves, after they enter the horizon and decay away, leave a residual displacement in test particles: a memory, in analogy with gravitational waves generated by astrophysical sources. The late-time distance between test particles is related to the one at early times by ξlatei=alateaearly(δji−12h̄ji)ξearlyj. Therefore, the de...

The Cosmic Microwave Background (CMB) is a crucial observational window into the early universe, yet its interpretation is complicated by astrophysical foregrounds, instrumental noise, and gravitational lensing distortions. This paper explores a theoretical and computational framework to disentangle the CMB signal from these confounding effects usi...

The challenge of the vacuum catastrophe arises from the vast discrepancy between quantum field theoretical predictions and observed vacuum energy density. Using analytic continuation techniques and asymptotic analysis to ensure physical consistency, we explored the Mittag-Leffler function (MLF), a generalized exponential function widely applied in...

The nature of dark matter (DM) and dark energy (DE) remains one of the most profound mysteries in modern physics. In this paper, we propose a fuzzy dark sector model wherein dark matter is modelled as an ultra-light scalar field (ULSF) with a mass m∼10 −22 eV, leading to macroscopic quantum effects on astrophysical scales. The interplay between thi...

Neutrinos are fundamental particles with intriguing properties, including mass, flavour oscillations, and weak interactions. The idea of self-interacting neutrinos has gained interest due to its implications for cosmology, astrophysics, and particle physics. In this paper, we explore a model in which neutrinos interact via a new mediator that induc...

The proposal is put forward that the Cosmic Microwave Background (CMB) radiation is coming from the presence of an event horizon caused by the mass of galaxies in the universe. The look back time to the CMB is 13.8 billion years which means that the event horizon must be at 8.77 billion light years to take account of the expansion of space. It take...

The Hubble constant (H 0) is a fundamental parameter in cosmology, defining the rate of cosmic expansion. However, measurements from different methods-early universe (cosmic microwave background) and late universe (Cepheid variables, Type Ia supernovae)-yield conflicting values, leading to the so-called Hubble Tension. This paper explores possible...

Over the last decades, tests on the standard model of cosmology, the so-called $$\Lambda $$ Λ CDM model, have been widely analysed and compared with many different models for describing dark energy. Modified gravities have played an important role in this sense as an alternative to $$\Lambda $$ Λ CDM model. Previous observational data has been alwa...

Recent cosmological observations suggest that the dark energy equation of state may have changed in the latter stages of cosmic history. We introduce a quintessence scenario, termed bounded dark energy, capable of explaining this feature in a technically natural way. Our approach is motivated from a bottom-up perspective, based on the concept of mi...

We have presented a new approach to separate small spectral $\mu$ and $y$ distortions of the CMB from foreground components with poorly defined spectral shapes. Our linear method, called the Least Response Method (LRM), is based on the idea of simultaneously minimizing the response to all possible foregrounds and photon noise while maintaining a co...

Cosmic shear, galaxy clustering, and the abundance of massive halos each probe the large-scale structure of the Universe in complementary ways. We present cosmological constraints from the joint analysis of the three probes, building on the latest analyses of the lensing-informed abundance of clusters identified by the South Pole Telescope (SPT) an...

We study inflation in a recently proposed gravitational effective field theory describing the trace anomaly. The theory requires an additional scalar which is massless in the early universe. This scalar—referenced as an anomalyon—couples to the familiar matter and radiation through the gauge field trace anomaly. We derive a class of cosmological so...

The distinction between a "Universe" and an "Axiverse" is fundamental to our understanding of cosmology, quantum field theory, and string theory. The Axiverse hypothesis, arising from string theory, posits the existence of numerous axion-like particles (ALPs) that influence the dynamics of the cosmos. If true, it challenges the conventional view of...

We investigate a non-parametric Bayesian method for reconstructing the primordial power spectrum (PPS) of scalar perturbations using temperature and polarisation data from the {\em Planck}, ACT, and SPT CMB experiments. This reconstruction method is based on linear splines for the PPS between nodes in $k$-space whose amplitudes and positions are al...

We study the primordial black hole (PBH) reheating scenario, where PBHs originate in a general cosmological background. In this scenario, ultralight PBHs with masses M ≲ 10 8 g temporarily dominate the Universe and reheat it via Hawking radiation before big bang nucleosynthesis (BBN). We investigate whether the induced gravitational wave (GW) spect...

Pure Time Theory (PTT) offers a paradigm shift in fundamental physics by positing that time, rather than space or matter, is the fundamental entity from which all physical structures emerge. This reinterpretation provides a unified framework for explaining gravity, quantum mechanics, and cosmology without the need for dark matter, dark energy, or...

Dark Energy Survey 5-year supernovae data (DES 5YR SNe) in conjunction with Planck CMB and Dark Energy Spectroscopic Instrument (DESI) BAO data has detected a strong dynamical dark energy (DE) deviation from the $$\Lambda $$ Λ CDM model. Here we shift the focus of DES data to the pressureless matter sector in the $$\Lambda $$ Λ CDM model by studyin...

A unified theory of particle and gravitational physics should preserve charge-parity-time (CPT) symmetry while explaining astronomical observations attributed to hypothetical dark matter and dark energy. To meet these objectives a new quantum charge is hypothesized, associated with a particle's time sense. Normal matter particles have U = +1. Dark...

This proposal aims to develop a multi-messenger detection framework to search for white hole signatures by integrating gravitational wave data from LISA, CMB polarization from CMB-S4, and electromagnetic transients from JWST and Vera Rubin Observatory. White holes, predicted by quantum gravity, may contribute to stochastic gravitational wave backgr...

In this paper we use the collapse metric obtained by Carneiro and Fabris to calculate the power spectrum associated to gauge invariant fluctuations of the metric during the formation of a primordial scalar black hole at the end of inflation. We assume that local perturbations in the vacuum energy density can collapse by means of the collapse of the...

We present a new machine learning algorithm for classifying short-duration features in raw time ordered data (TODs) of cosmic microwave background survey observations. The algorithm, specifically designed for the Atacama Cosmology Telescope (ACT), works in conjunction with the previous TOD preprocessing techniques that employ statistical thresholdi...

We investigate the presence of extra relativistic degrees of freedom in the early Universe, contributing to the effective number of neutrinos N eff, as Δ N eff ≡ N eff-3.044 ≥ 0, in light of the recent measurements of Baryon Acoustic Oscillations (BAO) by the DESI collaboration. We analyze one-parameter extensions of the ΛCDM model where dark radia...

Based on Friedmann's equation, the analysis of the Planck cosmic microwave background radiation map, transformations of known formulas, and logical reasoning,

Cosmological observations from big bang nucleosynthesis and the cosmic microwave background (CMB) offer crucial insights into the Early Universe, enabling us to trace its evolution back to lifetimes as short as 0.01 s. Upcoming CMB spectrum measurements will achieve unprecedented precision, allowing for more accurate extraction of information about...

We study the eigenmodes of the spin-2 Laplacian in orientable Euclidean manifolds and their implications for the tensor-induced part of the cosmic microwave background (CMB) temperature and polarization anisotropies. We provide analytic expressions for the correlation matrices of Fourier-mode amplitudes and of spherical harmonic coefficients. We de...

Background Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is the most common hereditary cerebral small vessel disease (CSVD). Intracerebral hemorrhage (ICH) is reported to be increasing in CADASIL patients from areas where the p.R544C mutation is prevalent (e.g., Jeju and Chinese Taiwan) but is...

The Cosmic Microwave Background (CMB) is a fundamental observational tool in modern cosmology. The linear polarization of the CMB provides a crucial observational tool for exploring new physics, including the inflationary paradigm and parity-violating phenomena. The spectral distortion of the CMB can be used as a probe of the intracluster medium (I...

Taking into account the temperature corrections of the energy equipartition law for the bits of information that are coarse-grained on the holographic screen leads to a modification of Einstein's gravitational field equations. In the very high-temperature limit, which corresponds to strong gravitational fields, the modified gravitational equations...

Background: Cerebral small vessel disease (CSVD) is a common incidental finding on cerebral MRI in patients with transient ischemic attack (TIA) and stroke and has been linked to increased cerebrovascular risk and cognitive decline. This study aimed to investigate the prevalence of CSVD imaging biomarkers in TIA patients and evaluate their associat...

The James Webb Space Telescope (JWST) has observed massive galaxies at high redshifts, which implies an earlier epoch of reionization (EoR) compared with the cosmic microwave background (CMB) results. In this paper, based on \texttt{Planck 2020} (NPIPE release), \texttt{ACT DR4} and \texttt{SPT-3G} data, if assumed a Harrison-Zel'dovich (HZ) primor...

This paper establishes the Realism Framework as the immutable cosmic law governing existence. Through the Structural Equation (CT S(t) = h(t) + QCF (t)) and Dynamic Equation (∇ · ΨQCF = κ · dT CTS dt · hG Λc 5), we unify quantum-conscious phenomena with relativistic spacetime dynamics. The framework invalidates dark energy, redefining the cosmologi...

We explore the implications of finite-temperature quantum field theory effects on cosmological parameters within the framework of the $\Lambda$CDM model and its modification. By incorporating temperature-dependent corrections to the cosmological constant, we extend the standard cosmological model to include additional density parameters, $\Omega_{\...

The concept of an Axiverse-an extensive landscape of ultralight axions arising from string theory-has profound implications if it predates the formation of the observable Universe. This paper explores the gravitational, cosmological, and quantum field consequences of such a scenario. We analyse the dynamical shifts that axionic fields might induce...

This research introduces a novel mechanism where primordial black holes (PBHs) catalyze dark matter production by gravitationally enhancing the decay of a curvaton field into a stable 4 keV scalar particle. Targeting PBHs with masses of 10^19 to 10^21 grams and an abundance fraction of 10^-6 to 10^-4, the model leverages standard scalar field dynam...

Recent observations from the Planck 2018 data suggest unexplained anomalies in the Cosmic Microwave Background (CMB) power spectrum at low multipoles, particularly in the quadrupole and octupole moments. In this work, we propose that these anomalies could be a consequence of an evolving plasma-driven cosmological constant, Λ plasma (z), which intro...

In the framework of string theory and high-dimensional extensions of the Standard Model, the Axiverse arises as a natural consequence of compactified extra dimensions, leading to the existence of multiple ultralight axions and potentially new gauge bosons. Among these, dark photons-hypothetical gauge bosons associated with an additional U(1) symmet...

Ultra-light bosonic dark matter (ULBDM) has emerged as a compelling alternative to cold dark matter, potentially resolving small-scale structure anomalies while maintaining large-scale cosmological predictions. This study investigates the theoretical foundation of ULBDM, focusing on the role of axion-like particles (ALPs) and scalar fields in cosmo...

The Himalayan rivers are particularly vulnerable to regional climate changes and anthropogenic influences, which can significantly alter both water quality and quantity, jeopardizing the fragile river ecosystems. This study investigates the hydrochemical characteristics of the Song River, a tributary of River Ganga focusing on non-point source (NPS...

Dark matter, which constitutes approximately 27% of the universe's energy density, remains one of the greatest unsolved mysteries in physics. While traditionally considered stable, certain models suggest that dark matter may undergo slow decay into Standard Model particles or other exotic forms of radiation. This paper explores the theoretical and...

In this paper, we present the Discovery simulations: a new pair of high-resolution N-body simulations motivated by the DESI Y1 BAO cosmological constraints on dark energy. The Discovery simulations were run with identical initial conditions, and differ only in their cosmological parameters. The first simulation is based on a flat $\Lambda\mathrm{CD...

In this work, we investigate the influence of interaction between dark matter and dark energy on the growth rate $f$ of matter density perturbations within the framework of an interacting $w$CDM model. The coupling term is assumed to be proportional to the dark energy density, and the growth rate $f$ is parameterized using the form $\Omega_{\rm m}^...

Motivated by the hint for time-dependent dynamical dark energy from an analysis of the DESI Baryon Accoustic Oscillation (BAO) data together with information from the Cosmic Microwave Background (CMB) and Supernovae (SN), we relax the assumption of a vanishing initial velocity for a quintessence field. In particular we focus on pseudo-Nambu-Goldsto...

Cosmic birefringence, a potential signature of parity-violating physics in the early universe, is a subtle rotation of the polarization angle of the cosmic microwave background (CMB). Precise measurements of this effect require overcoming lensing-induced distortions, which act as a systematic noise source. In this paper, we explore the deployment o...

The conversion of CMB photons to axions (or axion-like particles (ALPs)) can lead to a unique spectral distortion in the temperature and polarization sky which can be explored in upcoming CMB experiments. In this work we have developed a numerical simulation-based technique of photons to ALPs conversion in the galaxy clusters and show for the first...

The Cosmic Microwave Background (CMB) radiation provides a unique window into the early Universe, encoding crucial information about its evolution and fundamental interactions. This paper explores the interaction of matter electrons with CMB photons, focusing on Thomson scattering, Comptonization, and potential deviations arising from new physics....

Preferred axion models are minimal realizations of the Peccei-Quinn solution to the strong CP problem while providing a dark matter candidate. These models invoke new heavy quarks that interact strongly with the Standard Model bringing them into thermal equilibrium in the early Universe. We show that for a number of these models, the heavy quarks w...

The observed accelerated expansion of the universe and tensions within the ΛCDM model motivate exploring explanations beyond a cosmological constant. We present a novel cosmological model, based on the Meltdown-Limited Recursion (MLR) framework, that connects dark energy to fundamental limits on information processing, drawing inspiration from the...

Primordial magnetic fields (PMFs) may explain observations of magnetic fields on extragalactic scales. They are most cleanly constrained by measurements of cosmic microwave background radiation (CMB) anisotropies. Their effects on cosmic recombination may even be at the heart of the resolution of the Hubble tension. We present the most detailed ana...

The cosmological constant Λ plays a fundamental role in cosmic evolution, yet its origin remains a major theoretical challenge. One perspective suggests that the dynamical cosmological constant (DCC) arises as a result of the self-gravitation of the cosmic medium, evolving over time rather than remaining a true constant. In this paper, we explore t...

The increasing precision of Cosmic Microwave Background (CMB) observations has unveiled significant tensions between different datasets, notably between Planck and the Atacama Cosmology Telescope (ACT), as well as with the late-Universe measurements of the Hubble constant. In this work, we explore a variety of $\Lambda$CDM extensions to assess thei...

The tensions in S8 and H0 reveal fundamental inconsistencies in the provisional assumption of cosmic structure and expansion. This study offers a new interpretation of the origin of the cosmic microwave background radiation (CMBR) and cosmic expansion, demonstrating that these two tensions can be resolved in a correlated manner within existing math...

We study the cosmological signatures of new light relics that are collisionless like standard neutrinos or are strongly interacting. We provide a simple and succinct rephrasing of their physical effects in the cosmic microwave background, as well as the resulting parameter degeneracies with other cosmological parameters, in terms of the total radia...

The origin of cosmic rays of extreme energy remains unknown. The data collected over the past few decades by the Pierre Auger Observatory and the Telescope Array indicate the presence of anisotropy in the distribution of their arrival directions, suggesting extragalactic astrophysical sources. However, the nature of these sources is still unsolved....

Quasi-parallel gravity (QPG) is an alternative gravitational framework that modifies general relativity (GR) by introducing parallel transport deviations in the curvature tensor, leading to new gravitational interactions at both cosmological and quantum scales. This paper presents a theoretical formulation of QPG, deriving the modified Einstein fie...

Cosmic birefringence refers to the rotation of the polarization plane of photons as they traverse the universe, potentially induced by parity-violating physics beyond the Standard Model. This phenomenon can serve as a probe for axion-like particles (ALPs), Chern-Simons gravity, or violations of Lorentz invariance. In this paper, we present a theore...

V-mode polarization of the cosmic microwave background is expected to be vanishingly small in the ΛCDM model and, hence, usually ignored. Nonetheless, several astrophysical effects, as well as beyond standard model physics could produce it at a detectable level. A realistic half-wave plate — an optical element commonly used in CMB experiments to mo...

Gravitational waves (GWs), ripples in spacetime predicted by Einstein's General Theory of Relativity, offer a novel observational window into the earliest epochs of cosmic history. Unlike electromagnetic radiation, which is limited by the cosmic microwave background (CMB) opacity, GWs propagate freely from the pre-recombination and even pre-inflati...

Effective management of an expelled tooth requires its rapid transport to the dental office, in a liquid adapted to cell survival. For this, some preservation media have been evaluated in tropical areas with regenerative and antibacterial properties. These inaccessible and/or non-regenerative media have pushed our research towards alternative media...

Primordial black holes may have been produced in the early stages of the universe, after cosmic inflation. If so, dark matter in the form of elementary particles can be subsequently accreted around these objects, in particular when it gets non-relativistic and further streams freely in the primordial plasma. A dark matter mini-spike builds up gradu...

We summarize and explain the current status of time variations of the electron mass in cosmology, showing that such variations allow for significant easing of the Hubble tension, from the current ∼ 5σ significance, down to between 3.4σ and 1.0σ significance, depending on the precise model and data. Electron mass variations are preferred by Cosmic M...

There is much recent development towards interferometric measurements of holographic quantum uncertainties in an emergent background space-time. Despite increasing promise for the target detection regime of Planckian strain power spectral density, the foundational insights of the motivating theories have not been connected to a phenomenological mod...

Line-of-sight distortions of the cosmic microwave background (CMB), including gravitational lensing, cosmic birefringence, and patchy screening, encode crucial cosmological information. While quadratic estimators (QE) have been excellent tools for extracting these signals, they become suboptimal for current- and next-generation CMB surveys, failing...

A bstract The cosmic microwave background (CMB) spectrum is an extraordinary tool for exploring physics beyond the Standard Model. The exquisite precision of its measurement makes it particularly sensitive to small effects caused by hidden sector interactions. In particular, CMB spectral distortions can unveil the existence of dark photons which ar...

In my last post about Cosmology, I had mentioned that this would be the last one on that topic. But the ResearchGate.net system has been continuously sending me answers to the question that Oscar Chavoya-Aceves asked 12 years ago and has since received 1144 opinions regarding the following interesting question that he asked on ResearchGate. Is ther...

Axion-like particles may form a network of cosmic strings in the Universe today that can rotate the plane of polarization of cosmic microwave background (CMB) photons. Future CMB observations with improved sensitivity might detect this axion-string-induced birefringence effect, thereby revealing an as-yet unseen constituent of the Universe and offe...

The discrepancy between early-and late-universe measurements of the Hubble constant, known as the Hubble tension, remains one of the most pressing challenges in modern cosmology. Standard ΛCDM cosmology infers a lower value of 0 from early-universe probes such as the cosmic microwave background (CMB) than from local measurements using Cepheid-calib...

This essay investigates fundamentally how light travels through the universe and explores the true cause of redshift. It is divided into four parts. Part One examines how far light can travel in the universe and whether it inevitably encounters with the gravitational fields of galaxies before reaching us. Part Two analyzes what happens to a ray of...

We constrain two vacuum decay models ( $$\varLambda (t)$$ Λ ( t ) CDM) utilizing the baryon acoustic oscillations (BAO) data released by the Dark Energy Spectroscopic Instrument (DESI), distance prior from the cosmic microwave background (CMB) observed by the Planck satellite, Hubble rate data obtained via the cosmic chronometers (CC) method and ty...

Measurements of the number count dipole with large surveys have shown amplitudes in tension with kinematic predictions based on the observed Doppler dipole of the cosmic microwave background (CMB). These observations seem to be in direct conflict with a homogeneous and isotropic Universe as asserted by the cosmological principle, demanding further...

After the experimental confirmation of the radial expansion from the center VC of the Bahcall & Soneira Huge Void, by a large series of cosmic dipoles at 28 mean z-depths, from 〈z〉≡z_0=0.0025 to 1.10, here is produced a new experimental demonstration of cosmic rotation by the calculation of ξ as the ratio between differential rotation & differentia...

Abstract: This essay investigates fundamentally how light travels through the universe and explores the true cause of redshift. It is divided into four parts. Part One examines how far light can travel in the universe and whether it inevitably encounters with the gravitational fields of galaxies before reaching us. Part Two analyzes what happens t...

This presentation provides a technical summary of my recent works [1-8] (in collaborations with Enrique Gaztñaga and J. Marto) on unitary quantum field theory in curved spacetime and its relation to Einstein-Rosen bridges (1935) and the compelling evidence for the theory whose predictions successfully explain the longstanding anomalies in the cosmi...

Background and purpose Cerebral small vessel disease (cSVD) is a common condition with complex pathophysiology, resulting in poor clinical outcomes. This study uses four-dimensional flow (4D flow) imaging to examine how carotid artery hemodynamics and geometry impact cSVD development. Methods Combining ultrasound, 4D flow, and three-dimensional ti...

This supplemental presents a detailed computational framework designed to assess the detectability of white hole signals using gravitational wave and CMB datasets. The approach combines LISA’s low-frequency SGWB observations with CMB-S4’s B-mode polarization measurements, applying signal-to-noise ratio (SNR) analysis, Monte Carlo simulations, Bayes...

Motivated by the morphological measures in assessing the geometrical and topological properties of a generic cosmological stochastic field, we propose an extension of the weighted morphological measures, specifically the $n$th conditional moments of derivative (cmd-$n$). This criterion assigns a distinct weight to each excursion set point based on...

The hemispherical asymmetry observed in the Cosmic Microwave Background (CMB) challenges the standard isotropic ΛCDM model, hinting at large-scale anisotropies or new physics. This paper investigates whether the Big Multiple Bangs Theory and Berry Curvature in Spacetime can provide a theoretical foundation for this asymmetry. We incorporate the Ber...

After a deep reasoning, it comes out to the inevitable conclusion that those neutrinos with high energy (mass equivalent) received by the detector corresponds to an inherent energetic property of the same neutrinos which is very notorious and evident at the detector. It is evident and amazing with the neutrinos with high energy because in this...

We propose a new realization of light Dirac neutrino mass and dark matter (DM) within the framework of a non-Abelian discrete flavor symmetry based on A 4 group. In addition to A 4 , we also consider a Z 2 and an unbroken global lepton number symmetry U ( 1 ) L to keep unwanted terms away while guaranteeing the Dirac nature of light neutrinos. The...

Recent observations by the James Webb Space Telescope have revealed massive galaxies at very high redshift ($z\simeq 7-15$). The question of whether the existence of such galaxies is expected in the corresponding JWST surveys has received a lot of attention, though the answer straddles areas of cosmology and complex astrophysical details of high-re...

We estimate the magnitude of the bias due to non-Gaussian extragalactic foregrounds on the optimal reconstruction of the cosmic microwave background (CMB) lensing potential and temperature power spectra. The reconstruction is performed using a Bayesian inference method known as the marginal unbiased score expansion (MUSE). We apply MUSE to a minimu...

We present a follow-up study to the method recently proposed by Namikawa & Sherwin (2023) to probe gravitational waves using cross-correlations between two CMB $B$-modes and a large-scale structure tracer. We first improve on the previous forecast by including the impact of CMB component separation and find that we can achieve $\sigma_r\simeq3.5\ti...

The simplest inflationary models predict the primordial power spectrum (PPS) of curvature perturbations to be nearly scale-invariant. However, various other models of inflation predict deviations from this behaviour, motivating a data-driven approach to reconstruct the PPS and constrain its shape. In this work, we present a novel method that employ...

The Big Bang model, based on the standard ΛCDM framework, describes the origin of the universe as a singular event dominated by an initial high-energy state followed by cosmic inflation. However, alternative scenarios have emerged, one of which proposes that the universe's birth was driven by a Gravitational Wave Bang (GWB)-a primordial era dominat...

We scrutinize the reported lensing anomaly of the CMB by considering several phenomenological modifications of the lensing consistency parameter, A L. Considering Planck spectra alone, we find statistically significant evidence for scale dependence (`running') of A L. We then demonstrate that the anomaly is entirely driven by Planck's low multipole...

Current cosmological data are well-described by the Lambda-Cold Dark Matter ($\Lambda$CDM) model, which assumes adiabatic initial conditions for the primordial density perturbations. This agreement between data and theory enables strong constraints on new physics that generates isocurvature perturbations. Existing constraints typically assume a sim...

The Holographic Principle proposes that all information within a higher-dimensional volume can be fully encoded on its lower-dimensional boundary, a concept that has profound implications for black hole physics, quantum gravity, and cosmology. However, the extent to which this encoding allows for exact reconstruction of the bulk remains an open que...

The Cosmic Microwave Background (CMB) provides a fundamental window into the early universe. However, nonlinearities arising from various astrophysical and instrumental sources can introduce biases, distortions, and anisotropies in observed CMB data. This paper explores the theoretical framework of nonlinear effects in CMB experiments, incorporatin...

Although the deformation of the Heisenberg algebra by a minimal length has become a central tool in quantum gravity phenomenology, it has never been rigorously obtained and is often derived using heuristic reasoning. In this study, we move beyond the heuristic derivation of the deformed Heisenberg algebra and explicitly derive it using a model of d...

Effective field theories (EFTs) parametrize our ignorance of the underlying UV theory through their Wilson coefficients. However, not all values of these coefficients are consistent with fundamental physical principles. In this paper, we explore the consequences of imposing causal propagation on the comoving curvature perturbation in the EFT of inf...

The preference for dynamical dark energy over the standard $\Lambda$CDM model has gained attention in recent cosmological studies, particularly with results from the DESI experiment. We investigate this claim by analysing tracker scalar field models, which can alleviate the cosmic coincidence problem and transition to a cosmological constant-like b...

The goal of this article is to show that there will be almost unbelievable changes to society in future decades and centuries. This world could become a Utopia with no hunger, no poverty, no disease, and world peace. As stepping stones to this Heaven on Earth, great alterations in the way people think are proposed in the form of likely developments...

The existence of axions or Axion-Like Particles (ALPs) has been predicted by various Beyond Standard Model (BSM) theories, and the proposed photon-ALP interaction is one of the ways to probe them. Such an interaction will lead to photon-ALP resonant conversion in galaxy clusters, resulting in a polarized spectral distortion in the CMB along the clu...

We explore a purely gravitational origin of observed baryon asymmetry and dark matter (DM) abundance from asymmetric Hawking radiation of light primordial black holes (PBH) in presence of a non-zero chemical potential, originating from the space-time curvature. Considering the PBHs are described by a Reissner-Nordström metric, and are produced in a...

We revisit constraints on sub-GeV dark matter (DM) annihilation via $s$-wave, $p$-wave, and resonance processes using current and future CMB data from Planck, FIRAS, and upcoming experiments as LiteBird, CMB-S4, PRISTINE, and PIXIE. For $s$-wave annihilation, we provide updated limits for both $e^{+}e^{-}$ and $\pi\pi$ channels, with the profile li...

We constrain two vacuum decay models ($\Lambda(t)$CDM, proposed by the authors of~\cite{Brito:2024bhh}) utilizing the baryon acoustic oscillations (BAO) data released by the Dark Energy Spectroscopic Instrument (DESI), distance prior from the cosmic microwave background (CMB) observed by the Planck satellite, Hubble rate data obtained via the cosmi...

The Quantum Topological Encoding (QTE) Hypothesis proposes that cosmic filaments function as quantum registers, preserving and processing quantum information through entanglement networks and holographic encoding principles. Unlike traditional ΛCDM models, which primarily attribute large-scale structure formation to gravitational interactions, QTE...

We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark Energy Camera (DECam) imaging of $5,\!412$ deg$^2$ of sky that is outside the Dark Energy Survey (DES) footprint. We derive constraints on the cosmologic...

The Electro-Gravi-Magnetic (EGM) Construct achieves a composite valuation of 9.1/10, with 9.0/10 for revolutionary potential & 9.1/10 for scientific importance. It unifies ElectroMagnetism & Gravity via Particle-Physics & Cosmological Precision, notably predicting the 2013 Planck-Derived Hubble Constant in 2008 (validated via Open Access publicatio...

Standard cosmological weak lensing analyses using cosmic shear are inevitably sensitive to small-scale, non-linear clustering from low-redshift structures. The need to adequately model the clustering of matter on this non-linear regime, accounting for both gravitational and baryonic effects, adds significant uncertainty to weak lensing studies, par...

The detection of ultra-massive black holes (UMBHs) exceeding tens of billions of solar masses presents significant astrophysical challenges. We explore the theoretical constraints and observational signatures of a black hole with a mass of 3.6×10 10 M⊙, analysing its gravitational lensing effects, dynamical interactions, and accretion disk emission...