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Leading log solution for inflationary Yukawa theory
We generalize Starobinskii's stochastic technique to the theory of a massless, minimally coupled scalar interacting with a massless fermion in a locally de Sitter geometry. The scalar is an 'active'Expand
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Noncommutative differential calculus for a D-brane in a nonconstant B field background with H=0
In this paper we try to construct noncommutative Yang-Mills theory for generic Poisson manifolds. It turns out that the noncommutative differential calculus defined in an old work is exactly what weExpand
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The graviton propagator in de Donder gauge on de Sitter background
We construct the graviton propagator on de Sitter background in exact de Donder gauge. We prove that it must break de Sitter invariance, just like the propagator of the massless, minimally coupledExpand
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Infrared propagator corrections for constant deceleration
We derive the propagator for a massless, minimally coupled scalar on a D-dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration parameter. OurExpand
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de Sitter breaking through infrared divergences
Just because the propagator of some field obeys a de Sitter invariant equation does not mean it possesses a de Sitter invariant solution. The classic example is the propagator of a massless,Expand
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Perils of analytic continuation
A nice paper by Morrison demonstrates the recent convergence of opinion that has taken place concerning the graviton propagator on de Sitter background. We here discuss the few points which remainExpand
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Invariant measure of the one-loop quantum gravitational backreaction on inflation
We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We showExpand
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Gravitons Enhance Fermions during Inflation
We solve the effective Dirac equation for massless fermions during inflation in the simplest gauge, including all one loop corrections from quantum gravity. At late times the result for a spatialExpand
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Breaking of scaling symmetry by massless scalar on de Sitter
Abstract We study the response of a classical massless minimally coupled scalar to a static point scalar charge on de Sitter. By considering explicit solutions of the problem we conclude that – evenExpand
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Graviton one-loop effective action and inflationary dynamics
We consider the one-loop effective action due to gravitons in a FLRW background with constant epsilon=-(dH/dt)/H^2. By expanding around epsilon=0 (corresponding to an expansion around de SitterExpand
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