Mass loss by a scalar charge in an expanding universe

Details Mass loss by a scalar charge in an expanding universe Mass loss by a scalar charge in an expanding universe

2002-01-07

arxiv.org/abs/gr-qc/0201020v2

Phys.Rev. D65 (2002) 124006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, RevTeX4, Accepted for Phys. Rev. D

Scientific paper

10.1103/PhysRevD.65.124006

We study the phenomenon of mass loss by a scalar charge -- a point particle that acts a source for a noninteracting scalar field -- in an expanding universe. The charge is placed on comoving world lines of two cosmological spacetimes: a de Sitter universe, and a spatially-flat, matter-dominated universe. In both cases, we find that the particle's rest mass is not a constant, but that it changes in response to the emission of monopole scalar radiation by the particle. In de Sitter spacetime, the particle radiates all of its mass within a finite proper time. In the matter-dominated cosmology, this happens only if the charge of the particle is sufficiently large; for smaller charges the particle first loses some of its mass, but then regains it all eventually.

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