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General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
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.