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arXiv 1901.06299gr-qcastro-ph.CO
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引力非最小耦合模型中的粒子产生和衰变

Particle creation and decay in nonminimally coupled models of gravity

R. P. L. Azevedo, P. P. Avelino

摘要:

在扩展的引力模型中,与物质的非最小耦合被认为会导致不可逆的粒子产生。在本文中,我们挑战这个假设。我们认为,一个非最小的耦合的物质和引力部门的结果在宇宙学的时间尺度上的粒子动量的变化,无论粒子的创建或衰变。我们进一步认为,粒子的创建或衰变与引力的非最小耦合只能发生作为一个结果的显着偏离均匀的Friedmann-Robertson-Walker几何在微观尺度上,并提供了一个唯象描述粒子创建或衰变的宇宙演化的物质场密度的影响。

英文摘要:

In extended models of gravity a nonminimal coupling to matter has been assumed to lead to irreversible particle creation. In this paper we challenge this assumption. We argue that a non-minimal coupling of the matter and gravitational sectors results in a change in particle-momentum on a cosmological timescale, irrespective of particle creation or decay. We further argue that particle creation or decay associated with a non-minimal coupling to gravity could only happen as a result of significant deviations from a homogeneous Friedmann-Robertson-Walker geometry on microscopic scales, and provide a phenomenological description of the impact of particle creation or decay on the cosmological evolution of the density of the matter fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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