PIRSA:24050098

Upper Bound on Thermal Gravitational Wave Backgrounds from Hidden Sectors

Klaric, J. (2024). Upper Bound on Thermal Gravitational Wave Backgrounds from Hidden Sectors. Perimeter Institute. https://pirsa.org/24050098

Klaric, Juraj. Upper Bound on Thermal Gravitational Wave Backgrounds from Hidden Sectors. Perimeter Institute, May. 31, 2024, https://pirsa.org/24050098 

          @misc{ pirsa_PIRSA:24050098,
            doi = {10.48660/24050098},
            url = {https://pirsa.org/24050098},
            author = {Klaric, Juraj},
            keywords = {Particle Physics},
            language = {en},
            title = {Upper Bound on Thermal Gravitational Wave Backgrounds from Hidden Sectors},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {may},
            note = {PIRSA:24050098 see, \url{https://pirsa.org}}
          }

Juraj Klaric

University of Amsterdam

Talk number
PIRSA:24050098
Collection
Talk Type
Subject
Abstract

Hot viscous plasmas unavoidably emit a gravitational wave background, similar to electromagnetic black body radiation. In this talk we will discuss the contribution from hidden particles to the diffuse background emitted by the primordial plasma in the early universe. While this contribution can easily dominate over that from Standard Model particles, both are capped by a generic upper bound that makes them difficult to detect with interferometers in the foreseeable future. We will illustrate our results on the examples of axion-like particles and heavy neutral leptons. We will also discuss how this bound affects the previous estimates of gravitational wave backgrounds from particle decays out of thermal equilibrium.

---

Zoom link