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Creators/Authors contains: "Yesilyurt, B"

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  1. ; (, Journal of Physics A: Mathematical and Theoretical)
    Abstract In the peculiar manner by which physicists reckon descent, this article is by a ‘child’ and ‘grandchild’ of the late Stanley Deser. We begin by sharing reminiscences of Stanley from over 40 years. Then we turn to a problem which was dear to his heart: the prospect that gravity might nonperturbatively screen its own ultraviolet divergences and those of other theories. After reviewing the original 1960 work by ADM, we describe a cosmological analogue of the problem and then begin the process of implementing it in gravity plus QED. 
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    Free, publicly-accessible full text available May 8, 2026
  2. ; ; ; (, Classical and Quantum Gravity)
    Abstract We re-consider the graviton self-energy induced by a loop of massless, minimally coupled scalars on de Sitter background. On flat space background it can be represented as a sum of two tensor differential operators acting on scalar structure functions. On a general background these differential operators can be constructed from the linearized Ricci scalar and the linearized Weyl tensor. However, in cosmology one requires a third contribution which we derive here. 
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    Free, publicly-accessible full text available May 6, 2026
  3. ; ; (, Physics Letters B)
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  4. ; (, Journal of High Energy Physics)
    A<sc>bstract</sc> Nonlinear sigma models on de Sitter background have proved a useful prototype for quantum gravity in summing the large logarithms which arise from loop corrections. We consider a model whose evolution is described, at leading logarithm order, by the trace of the coincident, doubly differentiated scalar propagator. An analytic approximation for this quantity on an arbitrary expansion history is applied to generalize the resummed de Sitter result to any cosmological background which has experienced primordial inflation. In addition to analytic expressions, we present explicit numerical results for the evolution in a plausible expansion history. The large scales of primordial inflation are transmitted to late times. 
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  5. ; ; (, Physical Review D)
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  6. ; (, Journal of High Energy Physics)
    A bstract Nonlinear sigma models on de Sitter background possess the same kind of derivative interactions as gravity, and show the same sorts of large spacetime logarithms in correlation functions and solutions to the effective field equations. It was recently demonstrated that these logarithms can be resummed by combining a variant of Starobinsky’s stochastic formalism with a variant of the renormalization group. This work considers one of these models and completes two pieces of analysis which were left unfinished: the evolution of the background at two loop order and the one loop beta function. 
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