Abstract:We consider the difference between the radiation of particles in the de Sitter spacetime and the Schwinger pair creation in the electric field. We use the stationary Painleve-Gullstrand metric for the...We consider the difference between the radiation of particles in the de Sitter spacetime and the Schwinger pair creation in the electric field. We use the stationary Painleve-Gullstrand metric for the de Sitter spacetime, where the particles are created by Hawking radiation from the cosmological horizon, and time independent gauge for the electric field. In these stationary frames the Hamiltonians and the energy spectra of massive particles look rather similar. However, the final results are essentially different. In case of Schwinger pair production the number density of the created pairs grows with time, while in the de Sitter vacuum the number density of the created pairs is finite. The latter suggests that Hawking radiation from the cosmological horizon does not lead to instability of the de Sitter vacuum, and the other mechanisms of instability are required for the dynamical solution of the cosmological constant problem. This conclusion is supported by the consideration of the thermodynamics of the de Sitter state. As distinct from the black hole physics, the de Sitter thermodynamics is not determined by the cosmological horizon and its Hawking temperature. In particular, the atom in the de Sitter universe experiences thermal activation corresponding to the local temperature, which is twice larger than the Hawking temperature. The reason, why it is exactly twice the Hawking temperature, follows from the geometry of the de Sitter spacetime.Read More
Publication Year: 2020
Publication Date: 2020-07-12
Language: en
Type: article
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