Gravitational wave stochastic background from cosmological particle decay

Allen, Bruce

doi:10.1103/PhysRevResearch.2.012034

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Gravitational wave stochastic background from cosmological particle decay

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Allen, Bruce
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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1910.08213.pdf
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Citation

Allen, B. (2020). Gravitational wave stochastic background from cosmological particle decay. Physical Review Research, 2: 012034. doi:10.1103/PhysRevResearch.2.012034.

Cite as: https://hdl.handle.net/21.11116/0000-0004-EE72-0

Abstract

We assume that cosmological dark matter is composed of massive neutral scalar
particles that decay into two massless particles. The decay produces a
stochastic background of gravitational waves because of the "memory effect". We
calculate the spectrum of this background and discuss its potential
observability. Penrose has proposed a cosmological model for which these
particles have the Planck mass and decay into two gravitons [arXiv:1707.04169].
For these, the spectrum has an additional "direct" contribution from the decay
products, which we also estimate and discuss.