A parton picture of de Sitter space during slow-roll inflation

Details A parton picture of de Sitter space during slow-roll inflation A parton picture of de Sitter space during slow-roll inflation

2009-03-16

arxiv.org/abs/0903.2788v2

JCAP 0905:021,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

36 pages; uses iopart.cls and feynmp.sty. v2: Minor typos corrected. Matches version published in JCAP

Scientific paper

10.1088/1475-7516/2009/05/021

It is well-known that expectation values in de Sitter space are afflicted by infra-red divergences. Long ago, Starobinsky proposed that infra-red effects in de Sitter space could be accommodated by evolving the long-wavelength part of the field according to the classical field equations plus a stochastic source term. I argue that--when quantum-mechanical loop corrections are taken into account--the separate-universe picture of superhorizon evolution in de Sitter space is equivalent, in a certain leading-logarithm approximation, to Starobinsky's stochastic approach. In particular, the time evolution of a box of de Sitter space can be understood in exact analogy with the DGLAP evolution of partons within a hadron, which describes a slow logarithmic evolution in the distribution of the hadron's constituent partons with the energy scale at which they are probed.

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