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Friction in inflaton equations of motion

Ian D. Lawrie
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Abstract

The possibility of a friction term in the equation of motion for a scalar field is investigated in non-equilibrium field theory. The results obtained differ greatly from existing estimates based on linear response theory, and suggest that dissipation is not well represented by a term of the form $η\dotϕ$.

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Ian D. Lawrie. 2002-04-20. Friction in inflaton equations of motion. https://doi.org/10.1103/physrevd.66.041702

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