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

作者：Seery David^*

来源：Journal of Cosmology and Astroparticle Physics, 2009, 2009(5): 021.

DOI：10.1088/1475-7516/2009/05/021

• inflation
• initial conditions and eternal universe
• physics of the early universe
• cosmological perturbation theory

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.

• 出版日期2009-5