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

journal contribution
posted on 2023-06-08, 05:57 authored by David SeeryDavid Seery
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 equations of motion 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.

History

Publication status

  • Published

Journal

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

Publisher

Institute of Physics

Issue

05

Volume

2009

Page range

021

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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