Quantum aspects of nonlocal approach to the cosmological constant problem

Quantum aspects of nonlocal approach to the cosmological constant problem We have recently presented a manifestly local and general coordinate invariant formulation of a nonlocal approach to the cosmological constant problem which has been proposed by Carroll and Remmen. In this article, based on our formulation, we investigate some quantum aspects of this approach to the cosmological constant problem. In particular, we explicitly evaluate quantum effects to the effective cosmological constant from matter fields at one-loop level. We show that the effective cosmological constant receives radiative corrections and is not stable against quantum corrections so that it must be fine-tuned at every stage in the loop expansion. Next, we propose a new geometrical model of a nonlocal approach to the cosmological constant problem, and we show explicitly that in this new model the effective cosmological constant is indeed stable against radiative corrections. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Quantum aspects of nonlocal approach to the cosmological constant problem

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Quantum aspects of nonlocal approach to the cosmological constant problem

Abstract

We have recently presented a manifestly local and general coordinate invariant formulation of a nonlocal approach to the cosmological constant problem which has been proposed by Carroll and Remmen. In this article, based on our formulation, we investigate some quantum aspects of this approach to the cosmological constant problem. In particular, we explicitly evaluate quantum effects to the effective cosmological constant from matter fields at one-loop level. We show that the effective cosmological constant receives radiative corrections and is not stable against quantum corrections so that it must be fine-tuned at every stage in the loop expansion. Next, we propose a new geometrical model of a nonlocal approach to the cosmological constant problem, and we show explicitly that in this new model the effective cosmological constant is indeed stable against radiative corrections.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.024027
Publisher site
See Article on Publisher Site

Abstract

We have recently presented a manifestly local and general coordinate invariant formulation of a nonlocal approach to the cosmological constant problem which has been proposed by Carroll and Remmen. In this article, based on our formulation, we investigate some quantum aspects of this approach to the cosmological constant problem. In particular, we explicitly evaluate quantum effects to the effective cosmological constant from matter fields at one-loop level. We show that the effective cosmological constant receives radiative corrections and is not stable against quantum corrections so that it must be fine-tuned at every stage in the loop expansion. Next, we propose a new geometrical model of a nonlocal approach to the cosmological constant problem, and we show explicitly that in this new model the effective cosmological constant is indeed stable against radiative corrections.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 15, 2017

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