Horst Stoecker

Horst Stoecker
Frankfurt Institute for Advanced Studies FIAS · Theory Experiment Simulations

Ph.D. Physics

About

694
Publications
25,798
Reads
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51,778
Citations
Additional affiliations
August 2007 - present
GSI Helmholtzzentrum für Schwerionenforschung and FIAS and Goethe University
Position
  • Professor, CEO, research group leader 'theory-experiment-simulations', senior fellow
August 2007 - present
GSI Helmholtzzentrum für Schwerionenforschung
Position
  • CEO and Scientific Director
January 2004 - present
Frankfurt Institute for Advanced Studies FIAS
Position
  • Vorstand and Senior Fellow
Education
April 1976 - August 1979
Goethe-Universität Frankfurt am Main
Field of study
  • Theoretical Physics

Publications

Publications (694)
Article
Full-text available
An extension to the Einstein–Cartan (EC) action is discussed in terms of cosmological solutions. The torsion incorporated in the EC Lagrangian is assumed to be totally anti-symmetric, represented by a time-like axial vector $$S^\mu $$ S μ . The dynamics of torsion is invoked by a novel kinetic term. Here we show that this kinetic term gives rise to...
Preprint
Ground-state properties of finite drops of alpha particles (Q-balls) are studied within a field-theoretical approach in the mean-field approximation. The strong interaction of alphas is described by the scalar field with a sextic Skyrme-like potential. The radial profiles of scalar and Coulomb fields are found by solving the coupled system of Klein...
Article
The equation of state and phase diagram of strongly interacting matter composed of α particles are studied in the mean-field approximation. The particle interactions are included via a Skyrme-like mean field, containing both attractive and repulsive terms. The model parameters are found by fitting the values of binding energy and baryon density in...
Article
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The properties of compact stars and in particular the existence of twin star solutions are investigated within an effective model that is constrained by lattice QCD thermodynamics. The model is modified at large baryon densities to incorporate a large variety of scenarios of first order phase transitions to a phase of deconfined quarks. This is ach...
Preprint
Full-text available
The properties of compact stars and in particular the existence of twin star solutions are investigated within an effective model that is constrained by lattice QCD thermodynamics. The model is modified at large baryon densities to incorporate a large variety of scenarios of first order phase transitions to a phase of deconfined quarks. This is ach...
Article
The phase diagram of isospin-symmetric chemically equilibrated mixture of α particles and nucleons (N) is studied in the mean-field approximation. Skyrme-like parametrization is used for the mean-field potentials as functions of partial densities nα and nN. We find that there is a threshold value a* of the parameter aNα which describes the attracti...
Article
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In this report the theoretical concepts of a chirally symmetric meson field theory are reviewed and an overview of the most relevant applications in nuclear physics is given. This includes a unified description of the vacuum properties of hadrons, finite nuclei and hot, dense and strange nuclear matter in an extended chiral SU(3)_L x SU(3)_R σ-ω mo...
Article
Thermodynamical properties of an interacting boson system at finite temperatures and zero chemical potential are studied within the framework of the Skyrme-like mean-field toy model. It is assumed that the mean field contains both attractive and repulsive terms. Self-consistency relations between the mean field and thermodynamic functions are deriv...
Preprint
The phase diagram of isospin-symmetric chemically equilibrated mixture of alpha particles and nucleons is studied in the mean-field approximation. Skyrme-like parametrization is used for the mean-field potentials as functions of partial densities of nucleons and alphas. We find that there is a threshold value a* of the parameter a(N-alpha) which de...
Article
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The chemical freeze-out parameters in central nucleus-nucleus collisions are extracted consistently from hadron-yield data within the quantum van der Waals (QvdW) hadron resonance gas model. The beam energy dependencies for skewness and kurtosis of net baryon, net electric, and net strangeness charges are predicted. The QvdW interactions in asymmet...
Article
The equation of state and the phase diagram of an isospin-symmetric chemically equilibrated mixture of a particles and nucleons (N) are studied in the mean-field approximation. We use a Skyrme-like parametrization of mean-field potentials as functions of the partial densities of particles. The parameters of these potentials are chosen by fitting th...
Article
Thermodynamical properties of an interacting system of scalar bosons at finite temperatures are studied within the framework of a field-theoretical model containing the attractive and repulsive self-interaction terms. Self-consistency relations between the effective mass and the thermodynamic functions are derived in the mean-field approximation. W...
Article
A model of inflation realization driven by fermions with curvature-dependent mass is studied. Such a term is derived from the covariant canonical gauge theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de Sitter phase followed by a successful exit, and moreover we acquire the subsequent thermal history, with an effective m...
Preprint
In this note we argue that the pathologies around the vacuum energy can be resolved by a Covariant Canonical Quantization (CCQ) procedure for fields, an inherently quantum theoretical description which does \emph{not} assume any classical dynamics in the expansion in terms of creation and annihilation operators. It is completely compatible with con...
Preprint
Full-text available
The chemical freeze-out parameters in central nucleus-nucleus collisions are extracted consistently from hadron yield data within the quantum van der Waals (QvdW) hadron resonance gas model. The beam energy dependence of both, skewness and kurtosis, of baryonic- and electric charges are predicted. The QvdW interactions in asymmetric matter, $Q/B \n...
Preprint
Full-text available
Thermodynamical properties of an interacting system of scalar bosons at finite temperatures are studied within the framework of a field-theoretical model containing the attractive and repulsive self-interaction terms. Self-consistency relations between the effective mass and thermodynamic functions are derived in the mean-field approximation. We sh...
Preprint
Full-text available
Inertial Confinement Fusion is a promising option to provide massive, clean, and affordable energy for humanity in the future. The present status of research and development is hindered by hydrodynamic instabilities occurring at the intense compression of the target fuel by energetic laser beams. A recent proposal Csernai et al. (2018) combines adv...
Article
The kaon-to-pion ratio K+/π+ and the scaled variance ω− for fluctuations of negatively charged particles are studied within the statistical hadron resonance gas (HRG) model and the ultrarelativistic quantum molecular dynamics (urqmd) transport model. The calculations are done for p+p,Be+Be,Ar+Sc, and Pb+Pb collisions at the CERN Super Proton Synchr...
Article
The equation of state and phase diagram of isospin-symmetric chemically equilibrated mixture of α particles and nucleons N are studied in the mean-field approximation. The model takes into account the effects of Fermi and Bose statistics for N and α, respectively. We use Skyrme-like parametrization of the mean-field potentials as functions of parti...
Article
Full-text available
The noncongruent liquid-gas phase transition (LGPT) in asymmetric nuclear matter is studied using the recently developed quantum van der Waals model in the grand canonical ensemble. Different values of the electric-to-baryon charge ratio, Q/B, are considered. This noncongruent LGPT exhibits several features which are not present in the congruent LG...
Article
Full-text available
The QCD equation of state at finite baryon density is studied in the framework of a Cluster Expansion Model (CEM), which is based on the fugacity expansion of the net baryon density. The CEM uses the two leading Fourier coefficients, obtained from lattice simulations at imaginary μB, as the only model input and permits a closed analytic form. Excel...
Preprint
Full-text available
On the basis of the regularized Dirac Lagrangian, we derive the Pauli interaction term of the subsequent field equation from the minimal coupling of the spinor $\psi$ to an external electromagnetic field $A_{\mu}$. An analogous coupling term emerges from the spinor's coupling to the spinor connection $\omega_{\mu}(x)$ in a curved spacetime. In the...
Article
We analyze the newest data from the NA61/SHINE Collaboration which, in addition to previous results on pions and kaons, include mean multiplicities of p, Λ, and ϕ mesons produced in inelastic proton-proton (p+p) interactions at sNN=6.3–17.3GeV. The canonical ensemble formulation of the ideal hadron resonance gas (HRG) model is used with exact conse...
Preprint
The kaon to pion ratio $K^+/\pi^+$ and the scaled variance $\omega^-$ for fluctuations of negatively charged particles are studied within the statistical hadron resonance gas (HRG) model and the Ultra relativistic Quantum Molecular Dynamics (UrQMD) transport model. The calculations are done for p+p, Be+Be, Ar+Sc, and Pb+Pb collisions at the CERN Su...
Preprint
The equation of state and phase diagram of isospin-symmetric chemically equilibrated mixture of alpha particles and nucleons are studied in the mean-field approximation. The model takes into account the effects of Fermi and Bose statistics for nucleons and alphas, respectively. We use Skyrme-like parametrization of the mean-field potentials as func...
Preprint
The QCD equation of state at finite baryon density is studied in the framework of a Cluster Expansion Model (CEM), which is based on the fugacity expansion of the net baryon density. The CEM uses the two leading Fourier coefficients, obtained from lattice simulations at imaginary $\mu_B$, as the only model input and permits a closed analytic form....
Preprint
We analyze the newest data from the NA61/SHINE collaboration which, in addition to previous results on pions and kaons, include mean multiplicities of $p$, $\Lambda$, and $\phi$-mesons produced in inelastic proton-proton (p+p) interactions at $\sqrt{s_{NN}}=6.3-17.3$~GeV. The canonical ensemble formulation of the ideal hadron resonance gas (HRG) mo...
Article
Full-text available
The effect of nuclear interactions on measurable net-proton number fluctuations in heavy ion collisions at the SIS18/GSI accelerator is investigated. The state of the art UrQMD model including interaction potentials is employed. It is found that the nuclear forces enhance the baryon number cumulants, as predicted from grand canonical thermodynamica...
Article
Eigenvolume effects in the hadron resonance gas (HRG) model are studied for experimental hadronic yields in nucleus–nucleus collisions. If particle eigenvolumes are different for different hadron species, the excluded volume HRG (EV-HRG) improves fits to multiplicity data. In particular, using different mass–volume relations for strange and non-str...
Article
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The covariant canonical transformation theory applied to the relativistic theory of classical matter fields in dynamical space-time yields a new gauge field theory of gravitation. The emerging field equations embrace a quadratic Riemann curvature term added to Einstein's linear equation. The quadratic term facilitates a momentum field which generat...
Article
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An introduction describing Walter Greiner's scientific life for the topical volume to be published by EPJA
Article
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In this article we will focus on the appearance of the hadron-quark phase transition and the formation of strange matter in the interior region of the hypermassive neutron star and its conjunction with the spectral properties of the emitted gravitational waves (GWs). A strong hadron-quark phase transition might give rise to a mass-radius relation w...
Article
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In this proceeding we review our recent work using supervised learning with a deep convolutional neural network (CNN) to identify the QCD equation of state (EoS) employed in hydrodynamic modeling of heavy-ion collisions given only final-state particle spectra ρ(pT, Ф). We showed that there is a traceable encoder of the dynamical information from ph...
Article
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In this talk we discuss the effects of the hadronic rescattering on final state observables in high energy nuclear collisions. We do so by employing the UrQMD transport model for a realistic description of the hadronic decoupling process. The rescattering of hadrons modifies every hadronic bulk observable. For example apparent multiplicity of reson...
Chapter
The underlying open questions in the fields of general relativistic astrophysics and elementary particle and nuclear physics are strongly connected and their results are interdependent. Although the physical systems are quite different, the properties of a merged binary system of two neutron stars and the properties of the hot and dense matter crea...
Article
Full-text available
The generic form of spacetime dynamics as a gauge theory has recently been derived, based on only the action principle and on the general principle of relativity. In the present paper, the physical consequences are discussed. The gauge coupling terms obtained imply that Einstein's theory holds only for structureless (spin zero) particles, and aggre...
Article
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We present a general linear parameterization scheme for the QCD Landau free energy in the vicinity of the critical point of chiral phase transition in the $\mu$-$T$ plane. Based on the parametric free energy, we show that, due to the finite size effects, the regions of fluctuations of the order parameter (i.e. the $\sigma$ field) are broadened, and...
Article
Full-text available
Cluster Expansion Model (CEM), representing a relativistic extension of Mayer's cluster expansion, is constructed to study baryon number fluctuations in QCD. The temperature dependent first two coefficients, corresponding to the partial pressures in the baryon number $B = 1$ and $B = 2$ sectors, are the only model input, which we fix by recent latt...
Chapter
The hadron resonance gas model with the hadron-type dependent eigenvolume corrections is employed to fit the hadron yield data of the NA49 collaboration for central Pb + Pb collisions at the center of mass energy of the nucleon pair \(\sqrt{s_{_\mathrm{NN}}} = 6.3, 7.6, 8.8, 12.3,\) and 17.3 GeV, the hadron midrapidity yield data of the STAR collab...
Article
Full-text available
The underlying open questions in the fields of general relativistic astrophysics and elementary particle and nuclear physics are strongly connected and their results are interdependent. Although the physical systems are quite different, the 4D-simulation of a merger of a binary system of two neutron stars and the properties of the hot and dense mat...
Article
Full-text available
In this paper, the generic part of the gauge theory of gravity is derived, based merely on the action principle and on the general principle of relativity. We apply the canonical transformation framework to formulate geometrodynamics as a gauge theory. The starting point of our paper is constituted by the general De~Donder-Weyl Hamiltonian of a sys...
Article
Systems of Bose particles with both repulsive and attractive interactions are studied using the Skyrme-like mean-field model. The phase diagram of such systems exhibits two special lines in the chemical potential-temperature plane: one line which represents the first-order liquid-gas phase transition with the critical end point, and another line wh...
Article
The hadron-resonance gas (HRG) model with eigenvolume corrections is employed to fit the hadron yield data of the NA49 collaboration for central Pb+Pb collisions at $\sqrt{s_{NN}}$ = 6.3, 7.6, 8.8, 12.3, and 17.3 GeV, the hadron midrapidity yield data of the STAR collaboration for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, and the hadron midrap...
Article
The hadronic phase in ultrarelativistic nuclear collisions has a large influence on final state observables like multiplicity, flow and $p_t$ spectra, as studied in the UrQMD approach. In this model one assumes that a non-equilibrium decoupling phase follows a fluid dynamical description of the high density phase. Hadrons are produced assuming loca...
Article
Full-text available
View the article online for updates and enhancements. Related content Limiting temperature of pion gas with the van der Waals equation of state R V Poberezhnyuk, V Vovchenko, D V Anchishkin et al.-Alpha particle clusters and their condensation in nuclear systems Peter Schuck, Yasuro Funaki, Hisashi Horiuchi et al.-The structure of hypernuclei and h...
Article
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Determining the differential-rotation law of compact stellar objects produced in binary neutron stars mergers or core-collapse supernovae is an old problem in relativistic astrophysics. Addressing this problem is important because it impacts directly on the maximum mass these objects can attain and hence on the threshold to black-hole formation und...
Article
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The equation of state of a baryon-symmetric hadronic matter with hard-sphere interactions is studied. It is assumed that mesons are point-like, but baryons and antibaryons have the same hard-core radius rB. Three possibilities are considered: 1) the baryon-baryon and antibaryon-baryon interactions are the same; 2) baryons do not interact with antib...
Article
The polarization of $\Lambda$ hyperons from relativistic flow vorticity is studied in peripheral heavy ion reactions at FAIR and NICA energies, just above the threshold of the transition to the Quark-Gluon Plasma. Previous calculations at higher energies with larger initial angular momentum, predicted significant $\Lambda$ polarization based on the...
Article
Particle number fluctuations are considered within the van der Waals (VDW) equation, which contains both attractive (mean-field) and repulsive (eigenvolume) interactions. The VDW equation is used to calculate the scaled variance of particle number fluctuations in generic Boltzmann VDW system and in nuclear matter. The strongly intensive measures $\...
Article
Partonic matter produced in the early stage of ultrarelativistic nucleus-nucleus collisions is assumed to be composed mainly of gluons, and quarks and antiquarks are produced at later times. The comparable hydrodynamic simulations of heavy-ion collisions for (2+1)-flavor and Yang-Mills equations of state performed by using three different hydrodyna...
Article
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We study the correlation between the distributions of the net-charge, net-kaon, net-baryon and net-proton number at hadronization and after the final hadronic decoupling by simulating ultra relativistic heavy ion collisions with the hybrid version of the ultrarelativistic quantum molecular dynamics (UrQMD) model. We find that due to the hadronic re...
Article
Partonic matter produced in the early stage of ultrarelativistic nucleus-nucleus collisions is assumed to be composed mainly of gluons, and quarks and antiquarks are produced at later times. To study the implications of such a scenario, the dynamical evolution of a chemically nonequilibrated system is described by ideal (2+1)-dimensional hydrodynam...
Article
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We present the derivation of the Yang-Mills gauge theory based on the covariant Hamiltonian representation of Noether's theorem. As the starting point, we re-formulate our previous presentation of the canonical Hamiltonian derivation of Noether's theorem. The formalism is then applied to derive the Yang-Mills gauge theory. The Noether currents of U...
Article
The early stage of a high multiplicity pp, pA and AA collisions is represented by a nearly quarkless, hot, deconfined pure gluon plasma. According to pure Yang–Mills lattice gauge theory, this hot pure glue matter undergoes, at a high temperature, a first-order phase transition into a confined Hagedorn glueball fluid. This new scenario should be ch...
Article
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We study the influence of hard-core repulsive interactions within the Hadron- Resonace Gas model in comparison to first principle calculation performed on a lattice. We check the effect of a bag-like parametrization for particle eigenvolume on flavor correlators, looking for an extension of the agreement with lattice simulations up to higher temper...
Article
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We study the eigenvolume effects in the hadron resonance gas (HRG) model on hadron yields at zero chemical potential. Using different mass-volume relations for strange and nonstrange hadrons we observe a remarkable improvement in the quality of the fit of the mean hadron multiplicities measured by the ALICE Collaboration in the central Pb+Pb collis...
Article
The hadron resonance gas model with hadron-type dependent eigenvolume corrections is employed to fit the hadron yield data of the NA49 collaboration for central Pb+Pb collisions at the c.m. energy per nucleon pair Ecm=6.3, 7.6, 8.8, 12.3, and 17.3 GeV, the hadron midrapidity yield data of the STAR collaboration for Au+Au collisions at Ecm=200 GeV,...
Article
Partonic matter produced in the early stage of ultrarelativistic nucleus-nucleus collisions is assumed to be composed mainly of gluons, and quarks and antiquarks are produced at later times. To study the implications of such a scenario, the dynamical evolution of the chemically nonequilibrated system is described by the ideal (2+1)-dimensional hydr...
Article
Full-text available
Electromagnetism, the strong and the weak interaction are commonly formulated as gauge theories in a Lagrangian description. In this paper we present an alternative formal derivation of U(1)-gauge theory in a manifestly covariant Hamilton formalism. We make use of canonical transformations as our guiding tool to formalize the gauging procedure. The...
Article
We analyze the directed flow of protons and pions in high-energy heavy-ion collisions in the incident energy range from $\sqrt{s_{{\scriptscriptstyle NN}}}=7.7$ GeV to 27 GeV within a microscopic transport model. Standard hadronic transport approaches do not describe the collapse of directed flow below $\sqrt{s_{{\scriptscriptstyle NN}}}\simeq 20$...
Article
We study the possibility that partonic matter produced at early stage of ultrarelativistic heavy-ion collisions is out of chemical equilibrium. It is assumed that initially this matter is mostly composed of gluons, but quarks and antiquarks are produced at later times. The dynamical evolution of partonic system is described by the Bjorken-like idea...
Article
Hagedorn states are the key to understand how all hadrons observed in high energy heavy ion collisions seem to reach thermal equilibrium so quickly. An assembly of Hagedorn states is formed in elementary hadronic or heavy ion collisions at hadronization. Microscopic simulations within the transport model UrQMD allow to study the time evolution of s...
Article
The conventional hadron-resonance gas (HRG) model with the Particle Data Group (PDG) hadron input and the mass dependent eigenvolume corrections is employed to fit the ALICE hadron mid-rapidity yield data on the most central Pb+Pb collisions. For the case of the point-like hadrons a well-known fit result of $T \sim 155$ MeV is reproduced. However,...
Article
Any physical theory that follows from an action principle should be invariant in its form under mappings of the reference frame in order to comply with the general principle of relativity. The required form-invariance of the action principle implies that the mapping must constitute a particular extended canonical transformation. In the realm of the...
Article
The early stage of high multiplicity nuclear collisions is represented by a nearly quarkless, hot, deconfined pure gluon plasma. These new scenario should be characterized by a suppression of high $p_T$ photons and dileptons as well as by reduced baryon to meson ratios. We present the numerical results for central Pb+Pb collisions at the LHC energi...