Refined Study of Isocurvature Fluctuations in the Curvaton Scenario
| Autor: | Naoya Kitajima, David Langlois, Shuichiro Yokoyama, Tomo Takahashi |
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| Přispěvatelé: | AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) |
| Rok vydání: | 2017 |
| Předmět: |
High Energy Physics - Theory
Particle physics axion: oscillation Cosmology and Nongalactic Astrophysics (astro-ph.CO) [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] media_common.quotation_subject Dark matter FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics General Relativity and Quantum Cosmology (gr-qc) isocurvature: perturbation 01 natural sciences General Relativity and Quantum Cosmology [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th] High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Cosmological perturbation theory curvaton: decay Curvaton 010303 astronomy & astrophysics Axion media_common Inflation (cosmology) Physics axion: dark matter 010308 nuclear & particles physics fluctuation [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th] Astronomy and Astrophysics dark matter: freeze-out suppression Universe dark matter: decoupling High Energy Physics - Phenomenology Amplitude High Energy Physics - Theory (hep-th) [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | JCAP JCAP, 2017, 12, pp.042. ⟨10.1088/1475-7516/2017/12/042⟩ JCAP, 2017, 12 (12), pp.042. 〈10.1088/1475-7516/2017/12/042〉 |
| DOI: | 10.48550/arxiv.1707.06929 |
| Popis: | We revisit the generation of dark matter isocurvature perturbations in the curvaton model in greater detail, both analytically and numerically. As concrete examples, we investigate the cases of thermally decoupled dark matter and axionic dark matter. We show that the radiation produced by the decay of the curvaton, which has not been taken into account in previous analytical studies, can significantly affect the amplitude of isocurvature perturbations. In particular, we find that they are drastically suppressed even when the dark matter freeze-out (or the onset of the axion oscillations for axionic dark matter) occurs before the curvaton decays, provided the freeze-out takes place deep in the curvaton-dominated Universe. As a consequence, we show that the current observational isocurvature constraints on the curvaton parameters are not as severe as usually thought. Comment: 34 pages, 7 figures |
| Databáze: | OpenAIRE |
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