Gravitational waves from dark matter isocurvature

2021/12/31 by Guillem Domènech, Samuel Passaglia, Sébastien Renaux‐Petel +1 · 69 citations
Physics and Astronomy · #Adiabatic process #Advanced Thermodynamics and Statistical Mechanics #Astrophysics #Classical mechanics #Cold dark matter #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Gravitation #Gravitational wave #Observable #Particle physics #Physics #Quantum mechanics #Spectral density #astro-ph.CO #gr-qc

paper · pdf · doi:10.1088/1475-7516/2022/03/023

published in Journal of Cosmology and Astroparticle Physics 2022(03), 023 (Institute of Physics) · 46 page, 9 figures; matches published version

openalex publication_date 2022/03/01 · arxiv created 2022/03/21 · arxiv updated 2022/03/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The primordial fluctuations on large scales are adiabatic, but on smaller scales this need not be the case. Here we derive the general analytical framework to compute the stochastic gravitational wave background induced by primordial cold dark matter isocurvature fluctuations on small scales. We find that large isocurvature fluctuations can yield an observable gravitational wave signal, with a spectrum distinct from the one induced by adiabatic perturbations, and we provide for the first time the exact analytic expression of the kernel necessary to compute this signal. We then forecast the constraining power of future gravitational wave detectors on dark matter isocurvature on small scales and find they will dramatically improve on existing constraints.

Citations

• The Pursuit of Non-Gaussian Fluctuations in the Cosmic Microwave Background
• Wandering in the Background: A CMB Explorer
• Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMBμdistortions
• The cosmological gravitational wave background from primordial density perturbations
• General primordial cosmic perturbation
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic Results
• Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model
• Prospects for observing and localizing gravitational-wave transients with Advanced LIGO, Advanced Virgo and KAGRA
• Science Case for the Einstein Telescope
• Primordial Black Holes as Dark Matter: Recent Developments
• Cosmological perturbations
• Primordial Black Holes as a dark matter candidate
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• Science case for the Einstein telescope
• Planck 2018 results. X. Constraints on inflation
• Laser Interferometer Space Antenna
• Planck 2018 results: VI. Cosmological parameters