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

Seery, David (2009) A parton picture of de Sitter space during slow-roll inflation. Journal of Cosmology and Astroparticle Physics, 2009 (05). 021. ISSN 1475-7516

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: David Seery
Date Deposited: 06 Feb 2012 20:19
Last Modified: 20 Jul 2012 11:42
URI: http://srodev.sussex.ac.uk/id/eprint/25438
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