Soft gravitons screen coupling in de Sitter space

Soft gravitons screen coupling in de Sitter space
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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:
Int.J.Mod.Phys.Conf.Ser.
影响因子:
--
通讯作者:
Kitazawa
Kitazawa
中科院分区:
--
文献类型:
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作者:
Kitamoto;Kitazawa

文献摘要

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de Sitter空间量子涨落的尺度不变性导致了引力子传播子中de Sitter对称性破缺红外辐射的出现。我们研究了软引力子对宇宙视界内物质场局部动力学的物理效应。我们证明了在标量场论和狄拉克场论中,红外谱不破坏洛伦兹不变性。在这两种情况下,领先的红外光谱可以被吸收的时间相关的波函数重整化因子。在有Yukawa相互作用的相互作用场论中,我们发现这种耦合具有一定的标度指数。我们认为,耦合的相对标度指数是规范不变的和物理的,因为我们可以使用耦合的演化作为一个物理时间。
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.