Rate of gravitational inflaton decay via gauge trace anomaly
- Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University, Theresienstrasse 37, 80333 Munich (Germany)
We analyze decay processes of the inflaton field, {phi}, during the coherent oscillation phase after inflation in f({phi})R gravity. It is inevitable that the inflaton decays gravitationally into gauge fields in the presence of f({phi})R coupling. We show a concrete calculation of the rate that the inflaton field decays into a pair of gauge fields via the trace anomaly. Comparing this new decay channel via the anomaly with the channels from the tree-level analysis, we find that the branching ratio crucially depends on masses and the internal multiplicities (flavor quantum number) of decay product particles. While the inflaton decays exclusively into light fields, heavy fields still play a role in quantum loops. We argue that this process in principle allows us to constrain the effects of arbitrary heavy particles in the reheating. We also apply our analysis to Higgs inflation, and find that the gravitational decay rate would never exceed gauge interaction decay rates if quantum gravity is unimportant.
- OSTI ID:
- 21504961
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevD.83.043511; (c) 2011 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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BRANCHING RATIO
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DAUGHTER PRODUCTS
FLAVOR MODEL
GAUGE INVARIANCE
GRAVITATION
HIGGS BOSONS
HIGGS MODEL
INTERACTIONS
MASS
MULTIPLICITY
OSCILLATIONS
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QUANTUM GRAVITY
BOSONS
COMPOSITE MODELS
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FIELD THEORIES
INVARIANCE PRINCIPLES
ISOTOPES
MATHEMATICAL MODELS
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QUANTUM FIELD THEORY
QUARK MODEL
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