A quantum gravitational relaxation of the cosmological constant

被引：18
|
作者：
Alexander, S
机构：
[1] Stanford Univ, Stanford Linear Accelerator Ctr, Dept Phys, Menlo Pk, CA 94025 USA
[2] Stanford Univ, ITP, Dept Phys, Menlo Pk, CA 94025 USA
来源：
PHYSICS LETTERS B | 2005年 / 629卷 / 2-4期
关键词：
D O I：
10.1016/j.physletb.2005.09.026
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Similar to QCD, general relativity has a Theta sector due to large diffeomorphisms. We make explicit, for the first time, that the gravitational CP violating Theta parameter is nonperturbatively related to the cosmological constant. A gravitational pseudoscalar coupling to massive fermions gives rise to general relativity from a topological B Lambda F theory through a chiral symmetry breaking mechanism. We show that a gravitational Peccei-Quinn like mechanism can dynamically relax the cosmological constant. (c) 2005 Published by Elsevier B.V.
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页码：53 / 59
页数：7
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