Zobrazeno 1 - 10
of 1 158
pro vyhledávání: '"Delos M"'
Autor:
Ganjoo, Himanish, Delos, M. Sten
In cosmologies with hidden sector dark matter, the lightest hidden sector species can come to dominate the energy budget of the universe and cause an early matter-dominated era (EMDE). EMDEs amplify the matter power spectrum on small scales, leading
Externí odkaz:
http://arxiv.org/abs/2403.18893
Autor:
Delos, M. Sten
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 529, Issue 3, April 2024, Pages 2349-2355
Perturbations to stellar systems can reflect the gravitational influence of dark matter substructures. On scales much smaller than the size of a stellar system, we point out analytic connections between the stellar and dark matter distributions. In p
Externí odkaz:
http://arxiv.org/abs/2312.13338
Autor:
Delos, M. Sten
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 2, February 2024, Pages 1372-1387
Excursion set theory is a powerful and widely used tool for describing the distribution of dark matter haloes, but it is normally applied with simplifying approximations. We use numerical sampling methods to study the mass functions predicted by the
Externí odkaz:
http://arxiv.org/abs/2311.17986
Autor:
Delos, M. Sten
Publikováno v:
Phys. Rev. D 109, 023532 (2024)
Prompt $\rho\propto r^{-1.5}$ density cusps are the densest and most abundant dark matter systems. If the dark matter is a weakly interacting massive particle (WIMP), recent studies have shown that prompt cusps dominate the aggregate dark matter anni
Externí odkaz:
http://arxiv.org/abs/2310.15214
Autor:
Delos, M. Sten, Korsmeier, Michael, Widmark, Axel, Blanco, Carlos, Linden, Tim, White, Simon D. M.
Publikováno v:
Phys. Rev. D 109, 083512 (2024)
Recent studies indicate that thermally produced dark matter will form highly concentrated, low-mass cusps in the early universe that often survive until the present. While these cusps contain a small fraction of the dark matter, their high density si
Externí odkaz:
http://arxiv.org/abs/2307.13023
Autor:
Ganjoo, Himanish, Delos, M. Sten
Publikováno v:
JCAP04(2024)015
In cosmologies with an early matter-dominated era (EMDE) prior to Big Bang nucleosynthesis, the boosted growth of small-scale matter perturbations during the EMDE leads to microhalo formation long before halos would otherwise begin to form. For a ran
Externí odkaz:
http://arxiv.org/abs/2306.14961
Publikováno v:
Phys. Rev. D 108, 023528 (2023)
An era of kination occurs when the Universe's energy density is dominated by a fast-rolling scalar field. Dark matter that is thermally produced during an era of kination requires larger-than-canonical annihilation cross sections to generate the obse
Externí odkaz:
http://arxiv.org/abs/2304.12336
Autor:
Delos, M. Sten
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 522, Issue 1, June 2023, Pages L78-L83
Every dark matter halo and subhalo is expected to have a prompt $\rho\propto r^{-1.5}$ central density cusp, which is a relic of its condensation out of the smooth mass distribution of the early universe. The sizes of these prompt cusps are linked to
Externí odkaz:
http://arxiv.org/abs/2302.03040
Autor:
Delos, M. S., Franciolini, G.
Publikováno v:
Phys. Rev. D 107, 083505 (2023)
Cosmological observations precisely measure primordial variations in the density of the Universe at megaparsec and larger scales, but much smaller scales remain poorly constrained. However, sufficiently large initial perturbations at small scales can
Externí odkaz:
http://arxiv.org/abs/2301.13171
Autor:
Delos, M. Sten, Silk, Joseph
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 520, Issue 3, April 2023, Pages 4370-4375
Primordial black holes (PBHs) form from large-amplitude initial density fluctuations and may comprise some or all of the dark matter. If PBHs have a broadly extended mass spectrum, or in mixed PBH-particle dark matter scenarios, the extreme density f
Externí odkaz:
http://arxiv.org/abs/2210.04904