John N. Bahcall’s research while affiliated with Columbia University and other places

... There exist many references in the published literature to the phenomenon of anomalous galactic rotation curves, and the implications for the existence of dark matter. (See [6], for example, for a pedagogical overview.) The issue can be summarised reasonably succinctly: the observed velocities of stars orbiting in galaxies, instead of falling off in proportion to 1/ √ R (where R is the radial distance of the star from the galactic centre), as might be expected with a conventional Keplerian model in Newtonian gravity, appear to remain virtually constant and extend out to distances several times greater than the radius of the galaxy's luminous core. ...

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Flattened Galaxy Rotation Curves in the Exochronous Metric

... An impressive example are the efforts of John Bahcall over an extended period. As reviewed by Bahcall (1989) early models did not include diffusion (e.g., Bahcall and Ulrich 1988). Bahcall and Pinsonneault (1992b) included diffusion of helium, whereas later models (e.g., Bahcall and Pinsonneault 1995;Bahcall et al. 2006 Cox et al. (1989), Guenther et al. (1992), Berthomieu et al. (1993), Turck-Chièze and Lopes (1993), Gabriel (1994Gabriel ( , 1997, Chaboyer et al. (1995), Guenther et al. (1996), Richard et al. (1996), Schlattl et al. (1997), Brun et al. (1998), Elliott (1998), Morel et al. (1999), Neuforge-Verheecke et al. (2001a) and Serenelli et al. (2011). ...

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Solar structure and evolution

... Due to these complications, at first it was necessary to assume the SSM predictions for all the solar neutrino fluxes and their uncertainties in order to extract reasonably constrained values for neutrino masses and mixing. The upcoming of the real-time experiments Super-Kamiokande and SNO and the independent determination of the flavor oscillation probability using reactor antineutrinos at KamLAND opened up the possibility of extracting the solar neutrino fluxes and their uncertainties directly from the data [9,171819202122. Nevertheless, in these works some set of simplifying assumptions had to be imposed in order to reduce the number of free parameters to be determined. ...

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Direct determination of the solar neutrino fluxes from solar neutrino data

... In the /resources/PPC_tables/south_pole/, we provide tables that parametrize the ice beneath the south pole. This uses scattering and absorption taken from [63], a uniform angular acceptance, and no tilt paramterization, i.e. it assumes flat ice. More details than these are known about the South Pole ice, e.g. ...

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Prometheus: An Open-Source Neutrino Telescope Simulation

... Extra-galactic sources are very far and the possibility of a individual discovery in a km 3 scale neutrino telescope is expected only in particular theoretical models, or using the source stacking methods: it is a combined analysis for different classes of objects which enhance the neutrinos detection probability [77]. ...

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High-Energy Astrophysics with Neutrino Telescopes

... The IceCube Observatory is a 1 km 3 deep Cherenkov detector located in glacial ice near the geographic South Pole [26]. It is optimized to detect neutrinos above an energy threshold of ∼ 100 GeV. ...

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Revealing ultra-high-energy cosmic ray acceleration with multi-messenger observations of the nearby GRB 980425/SN 1998bw

... For this reason, searches looking for WIMP annihilations in the centre of the Earth typically put limits on the annihilation rate or the muon flux coming from the centre of the Earth. The latest available limits are from the AMANDA [148] and Super-Kamiokande [149] experiments. No significant flux of neutrinos was found, and the limits on the muon flux from the centre of the Earth are on the order of 10 3 km −2 y −1 . ...

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Search for neutrinos from annihilating dark matter in galaxies and galaxy clusters with the IceCube detector

... Once operational, these experiments will represent the state of the art with their respective technologies. There are also a number of neutrino observatories such as KM3NeT [14] and IceCube [15], which shall complement the terrestrial experiments with observations of neutrinos of solar, atmospheric and astrophysical origin. ...

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Exploring SMEFT Induced Non-Standard Interactions from COHERENT to Neutrino Oscillations

... In Canada, a widely used grade 12 textbook 5 features the Sudbury Neutrino Observatory and links this topic to an introduction to particles and detection fundamentals. We conclude this brief look at an exciting field with some references [6][7][8][9][10][11][12] to representative articles that may be of interest. ...

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The Wondrous New World of Modern Particle Astrophysics

... The modern picture of the internal structure of the Sun has been built up over time. The three most important contributions to this have been the 'standard solar model' (SSM; Bahcall et al. 1982), helioseismology (Leibacher et al., 1985), and solar neutrino observations (Bahcall, 2001). As the interior of the Sun cannot be directly observed, its structure is modeled and then compared to the observed properties by iteratively changing the model parameters, until they match the observations. ...

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Evolution and Consequences of Coronal Mass Ejections in the Heliosphere