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roman pasechnik

Roman Pasechnik

Senior lecturer

roman pasechnik

Exploring the viability of a pseudo-Nambu-Goldstone boson as ultralight dark matter in a mass range relevant for strong gravity applications

Author

  • António P. Morais
  • Vinícius Oliveira
  • António Onofre
  • Roman Pasechnik
  • Rui Santos

Summary, in English

We study a simple extension of the Standard Model featuring a dark sector with an ultralight pseudo-Nambu-Goldstone boson as a dark matter candidate. We focus on the mass range O(10-20-10-10) eV, relevant for strong gravity applications, and explore its production and evolution in the early Universe. The model is formulated in such a way that dark matter does not couple directly to photons or other Standard Model particles avoiding some of the most stringent cosmological bounds related to axionlike particles. In this work, two different scenarios are considered depending on whether dark matter is produced in a preinflationary or postinflationary regime. We also discuss the effect from emergent topological defects such as cosmic strings and domain walls and estimate the spectrum of stochastic gravitational waves produced by their decay, enabling us to test the model at current and future gravitational-wave experiments.

Department/s

  • Particle and nuclear physics

Publishing year

2024-08

Language

English

Publication/Series

Physical Review D

Volume

110

Issue

3

Document type

Journal article

Publisher

American Physical Society

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 2470-0010