Author:
Bari Pritha,Bertacca Daniele,Bartolo Nicola,Ricciardone Angelo,Giardiello Serena,Matarrese Sabino
Abstract
Abstract
The imprint of gravitational waves (GWs) on large-scale structures (LSS) is a useful and promising way to detect or to constrain them. Tensor fossils have been largely studied in the literature as an indirect way to detect primordial GWs. In this paper we analyze a new effect induced by primordial GWs: a correction to the density contrast of the underlying matter distribution of LSS, as well as its radiation counterpart, induced by the energy density fluctuation of the gravitational radiation. We perform our derivation of the full analytical solution of the density contrast for waves entering the horizon during radiation dominance. We account for two phases in the radiation era, depending on the main contributor to the perturbed energy density of the Universe. By comparing the density contrast of cold dark matter and radiation — sourced by linear gravitational waves only — we conclude that the former overcomes the latter at some time in the radiation era, a behaviour analogous to their linear counterpart. Then we conclude by discussing the case of density perturbations produced by GWs entering the Hubble radius during the matter era as well as their evolution in the late dark-energy dominated phase.
Subject
Astronomy and Astrophysics
Reference74 articles.
1. Observation of Gravitational Waves from a Binary Black Hole Merger;Abbott;Phys. Rev. Lett.,2016
2. Sources of Gravitational Waves: theory and Observations;Buonanno,2014
3. Stochastic background of gravitational waves generated by a cosmological population of young, rapidly rotating neutron stars;Ferrari;Mon. Not. Roy. Astron. Soc.,1999
4. A Practical theorem on gravitational wave backgrounds;Phinney,2001
5. The astrophysical gravitational wave stochastic background;Regimbau;Res. Astron. Astrophys.,2011