Cosmological particle creation: Fluctuations and an ensemble picture

Details Cosmological particle creation: Fluctuations and an ensemble picture Cosmological particle creation: Fluctuations and an ensemble picture

2008-10-17

arxiv.org/abs/0810.3060v1

Int.J.Mod.Phys.D17:2441-2445,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, received an honorable mention in 2008 Gravity Research Foundation essay competition, to appear in special issue of IJ

Scientific paper

10.1142/S0218271808013935

We point out that in the context of quantum fields in time dependent classical backgrounds, the number of created particles with a given momentum largely deviates about its mean value. Since the corresponding Fourier modes are nonlocal, this deviation shows that the expectation value of the number operator can only make sense in an ensemble of spacetimes. Using a complete orthonormal family of localized wave packets, we show how an ensemble interpretation can be given to cosmological particle creation in local terms. The reheating process following inflation is reexamined in the light of this construction.

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