Unruh response functions for scalar fields in de Sitter space

Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology

Scientific paper

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16 pages, 1 figure, accepted for publication by Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/21/21/016

We calculate the response functions of a freely falling Unruh detector in de
Sitter space coupled to scalar fields of different coupling to the curvature,
including the minimally coupled massless case. Although the responses differ
strongly in the infrared as a consequence of the amplification of superhorizon
modes, the energy levels of the detector are thermally populated.

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