Dark Matter that can form Dark Stars

Abstract

The first stars to form in the Universe may be powered by the annihilation of weakly interacting dark matter particles. These so-called dark stars, if observed, may give us a clue about the nature of dark matter. Here we examine which models for particle dark matter satisfy the conditions for the formation of dark stars. We find that in general models with thermal dark matter lead to the formation of dark stars, with few notable exceptions: heavy neutralinos in the presence of coannihilations, annihilations that are resonant at dark matter freeze-out but not in dark stars, some models of neutrinophilic dark matter annihilating into neutrinos only and lighter than about 50 GeV. In particular, we find that a thermal DM candidate in standard Cosmology always forms a dark star as long as its mass is heavier than about 50 GeV and the thermal average of its annihilation cross section is the same at the decoupling temperature and during the dark star formation, as for instance in the case of an annihilation cross section with a non-vanishing s-wave contribution.

17 pages, 4 figures, figure 1 fixed

References in corpus (16)

• PYTHIA 6.4 Physics and Manual
• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• CMB constraints on Dark Matter models with large annihilation cross-section
• Dark matter and the first stars: a new phase of stellar evolution
• Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement
• Electroweak Bremsstrahlung in Dark Matter Annihilation
• Dark Matter Capture in the First Stars: a Power Source and Limit on Stellar Mass
• The Zero Age Main Sequence of WIMP burners
• The formation and evolution of young low-mass stars within halos with high concentration of dark matter particles
• Dirac gaugino as leptophilic dark matter
• Early Black Hole Formation by Accretion of Gas and Dark Matter

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• Signatures of dark matter burning in nuclear star clusters
• Multiscatter capture of superheavy dark matter by Pop. III stars
• Dark Stars and Boosted Dark Matter Annihilation Rates
• Detectability of Supermassive Dark Stars with the Roman Space Telescope
• The Sun and stars: Giving light to dark matter
• Constraints on asymmetric dark matter from asteroseismology