Soft gravitons screen coupling in de Sitter space
Soft gravitons screen coupling in de Sitter space
复制标题
德西特空间中的软引力子屏蔽耦合
DOI:
10.1142/s2010194513009616
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Kitazawa
中科院分区:
文献类型:
--
作者:
Kitamoto;Kitazawa
The scale invariance of the quantum fluctuations in de Sitter space leads to the appearance of de Sitter symmetry breaking infrared logarithms in the graviton propagator. We investigate physical effects of soft gravitons on the local dynamics of matter fields well inside the cosmological horizon. We show that the IR logarithms do not spoil Lorentz invariance in scalar and Dirac field theory. The leading IR logarithms can be absorbed by a time dependent wave function renormalization factor in both cases. In the interacting field theory withand Yukawa interaction, we find that the couplings become time dependent with definite scaling exponents. We argue that the relative scaling exponents of the couplings are gauge invariant and physical as we can use the evolution of a coupling as a physical time.