TL;DR
This paper proves that cosmological horizons in flat expanding universes emit radiation analogous to black hole horizons, extending Gibbons and Hawking's results beyond de Sitter space and linking it to the dynamical Casimir effect.
Contribution
It provides a rigorous proof of horizon radiation for any flat expanding universe with positive Hubble parameter, generalizing previous results.
Findings
Horizon radiation applies to all flat expanding universes with positive Hubble parameter.
The radiation mechanism is related to the dynamical Casimir effect.
Provides visual and intuitive understanding of horizon radiation.
Abstract
Gibbons and Hawking [Phys. Rev. D 15, 2738 (1977)] have shown that the horizon of de Sitter space emits radiation in the same way as the event horizon of the black hole. But actual cosmological horizons are not event horizons, except in de Sitter space. Nevertheless, this paper proves Gibbons' and Hawking's radiation formula as an exact result for any flat space expanding with strictly positive Hubble parameter. The paper gives visual and intuitive insight into why this is the case. The paper also indicates how cosmological horizons are related to the dynamical Casimir effect, which makes experimental tests with laboratory analogues possible.
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