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arXiv 0806.1493astro-ph
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大爆炸核合成与修正引力下的WIMP暗物质

Big-Bang Nucleosynthesis and WIMP dark matter in modified gravity

Jin U Kang, Grigoris Panotopoulos

摘要:

本文在一类修正的引力理论($f(R) \sim R^n$引力理论)中讨论了原初大爆炸核合成(BBN)和弱相互作用大质量粒子(WIMP)暗物质。新的引力模型的特点是一个单一的参数$n$。首先,我们确定的条件下,$^{4}$ He丰度的理论预测与观测一致。更确切地说,在BBN期间,物理学是已知的,并且所有参数都是已知的。唯一需要约束的自由参数是与新引力模型相关的幂$n$。之后,对于冷暗物质,我们使用从BBN考虑确定的$n$的值,并确定暗物质粒子的质量如何与湮灭截面相关,以满足冷暗物质约束。

英文摘要:

In the present work the primordial Big-Bang Nucleosynthesis (BBN) and weakly interacting massive particle (WIMP) dark matter are discussed in a certain class of modified gravitational theories, namely $f(R) \sim R^n$ gravity. The new gravitational model is characterized by a single parameter $n$. First we determine the conditions under which the theoretical predictions for the $^{4}$He abundance are in agreement with the observations. More precisely, during BBN the physics is known and all the parameters are known. The only free parameter to be constrained is the power $n$ related to the new gravitational model. After that, for cold dark matter we use the value of $n$ determined from the BBN considerations and determine how the mass of the dark matter particle is related to the annihilation cross section in order for the cold dark matter constraint to be satisfied.

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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