Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP10(2016)072
Keywords
Cosmology of Theories beyond the SM; Models of Quantum Gravity
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Funding
- Research Grants Council (RGC) of Hong Kong [HKUST4/CRF/13G, ECS 26300316]
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We study the decoherence of massive fields during inflation based on the Zurek's density matrix approach. With the cubic interaction between inflaton and massive fields, the reduced density matrix for the massive fields can be calculated in the Schrodinger picture which is related to the variance of the non-Gaussian exponent in the wave functional. The decoherence rate is computed in the one-loop form from functional integration. For heavy fields with m greater than or similar to O (H), quantum fluctuations will easily stay in the quantum state and decoherence is unlikely. While for light fields with mass smaller than O (H), quantum fluctuations are easily decohered within 5 similar to 10 e-folds after Hubble crossing. Thus heavy fields can play a key role in studying problems involving inflationary quantum information.
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