3D simulations with boosted primordial power spectra and ultracompact minihalos
| Autor: | Julian Adamek, Christian T. Byrnes, Shaun Hotchkiss, Mateja Gosenca |
|---|---|
| Přispěvatelé: | Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Univers et Théories ( LUTH ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Annihilation Structure formation Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] Dark matter Spectral density FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Upper and lower bounds Spectral line High Energy Physics - Phenomenology Amplitude High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Halo [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010303 astronomy & astrophysics QC Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Phys.Rev.D Phys.Rev.D, 2017, 96 (12), pp.123519. ⟨10.1103/PhysRevD.96.123519⟩ Physical Review D Physical Review D, American Physical Society, 2017, 96 (12), pp.123519. ⟨10.1103/PhysRevD.96.123519⟩ Phys.Rev.D, 2017, 96 (12), pp.123519. 〈10.1103/PhysRevD.96.123519〉 |
| ISSN: | 1550-7998 1550-2368 2470-0010 |
| DOI: | 10.1103/PhysRevD.96.123519⟩ |
| Popis: | We perform three-dimensional simulations of structure formation in the early Universe, when boosting the primordial power spectrum on approximately kpc scales. We demonstrate that our simulations are capable of producing power-law profiles close to the steep $\rho\propto r^{-9/4}$ halo profiles that are commonly assumed to be a good approximation to ultracompact minihalos (UCMHs). However, we show that for more realistic initial conditions in which halos are neither perfectly symmetric nor isolated, the steep power-law profile is disrupted and we find that the Navarro-Frenk-White profile is a better fit to most halos. In the presence of background fluctuations even extreme, nearly spherical initial conditions do not remain exceptional. Nonetheless, boosting the amplitude of initial fluctuations causes all structures to form earlier and thus at larger densities. With sufficiently large amplitude of fluctuations we find that values for the concentration of typical halos in our simulations can become very large. However, despite the signal coming from dark matter annihilation inside the cores of these halos being enhanced, it is still orders-of-magnitude smaller compared to the usually assumed UCMH profile. The upper bound on the primordial power spectrum from the non-observation of UCMHs should therefore be re-evaluated. Comment: 19 pages, 20 figures. v2: Minor changes to match the published version |
| Databáze: | OpenAIRE |
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