Journal Article

PUBDB-2021-04107

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Revisiting isocurvature bounds in models unifying the axion with the inflaton

Ballesteros, G. (Corresponding author) ; Ringwald, A. (Corresponding author)DESY* ; Tamarit, C. (Corresponding author) ; Welling, Y. M. (Corresponding author)DESY*

2021
IOP London

This record in other databases:        

Please use a persistent id in citations: doi:10.1088/1475-7516/2021/09/036  doi:10.3204/PUBDB-2021-04107

Report No.: DESY-21-048; IFT-UAM/CSIC-21-45; TUM-HEP-1334-21; arXiv:2104.13847

Abstract: Axion scenarios in which the spontaneous breaking of the Peccei-Quinn symmetry takes place before or during inflation, and in which axion dark matter arises from the misalignment mechanism, can be constrained by Cosmic Microwave Background isocurvature bounds. Dark matter isocurvature is thought to be suppressed in models with axion-inflaton interactions, for which axion perturbations are assumed to freeze at horizon crossing during inflation. However, this assumption can be an oversimplification due to the interactions themselves. In particular, non-perturbative effects during reheating may lead to a dramatic growth of axion perturbations. We perform lattice calculations in two models in which the Peccei-Quinn field participates in inflation. We find that the growth of axion perturbations is such that the Peccei-Quinn symmetry is restored for an axion decay constant $f_A\lesssim10^{16}$-$10^{17}$ GeV, leading to an over-abundance of dark matter, unless $f_A \lesssim 2 \times 10^{11}$ GeV. For $f_A\gtrsim10^{16}$-$10^{17}$ GeV we still find a large growth of axion perturbations at low momentum, such that a naive extrapolation to CMB scales suggests a violation of the isocurvature bounds.

Keyword(s): symmetry, Peccei-Quinn ; axion, dark matter ; inflaton, axion ; axion, decay constant ; effect, nonperturbative ; momentum, low ; horizon, crossing ; perturbation ; isocurvature ; GeV ; inflation ; cosmic background radiation ; spontaneous symmetry breaking ; lattice ; reheating ; suppression ; alignment

---

Contributing Institute(s):

1. Theorie-Gruppe (T)
2. Any Light Particle Search (ALPS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. EXC 2121 - Das Quantisierte Universum (390833306) (390833306)
3. STRINGFLATION - Inflation in String Theory - Connecting Quantum Gravity with Observations (647995) (647995)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Ballesteros, G. (Corresponding author) ; Ringwald, A. (Corresponding author)DESY* ; Tamarit, C. (Corresponding author) ; Welling, Y. M. (Corresponding author)DESY*
Revisiting isocurvature bounds in models unifying the axion with the inflaton
1-30 (2021) [10.3204/PUBDB-2021-02000]2021     Files  Fulltext by arXiv.org Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---