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arXiv 1502.05406hep-phastro-ph.COhep-th
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具有非热宇宙学历史的暗物质产生机制--分类

Dark Matter Production Mechanisms with a Non-Thermal Cosmological History - A Classification

Gordon L. Kane, Piyush Kumar, Brent D. Nelson, Bob Zheng

摘要:

本文对具有非热宇宙学历史的宇宙中的暗物质模型进行了全面的研究,即在大爆炸核合成(BBN)开始之前,宇宙中存在一个无压物质占优势的阶段。这样的宇宙学历史一般由包含引力耦合标量场(模量)的UV完备预言。我们在这个框架中对DM的不同生产机制进行分类,通过考虑广泛的DM质量/耦合来概括以前的工作,并允许DM与“暗”部门保持平衡。我们确定了四个不同的参数制度的生产遗迹DM,并得出准确的半解析近似DM遗迹丰度。我们的研究结果是特别相关的超对称理论,其中标准的非热产生的DM候选人不赞成间接检测的限制。我们还评论在这个框架内的实验信号,专注于新的影响,涉及DM密度扰动的功率谱。特别是,我们确定了一类模型,其中DM密度扰动的频谱是敏感的无压物质占主导地位的时代之前,BBN,引起有趣的天体物理签名,以寻找在未来。一个有价值的未来方向将是在这个框架内研究动机良好的理论模型,并进行详细的研究,预期的实验信号的模式。

英文摘要:

We perform a comprehensive study of models of dark matter (DM) in a Universe with a non-thermal cosmological history, i.e with a phase of pressure-less matter domination before the onset of big-bang nucleosynethesis (BBN). Such cosmological histories are generically predicted by UV completions that contain gravitationally coupled scalar fields (moduli). We classify the different production mechanisms for DM in this framework, generalizing previous works by considering a wide range of DM masses/couplings and allowing for DM to be in equilibrium with a "dark" sector. We identify four distinct parametric regimes for the production of relic DM, and derive accurate semi-analytic approximations for the DM relic abundance. Our results are particularly relevant for supersymmetric theories, in which the standard non-thermally produced DM candidates are disfavored by indirect detection constraints. We also comment on experimental signals in this framework, focusing on novel effects involving the power spectrum of DM density perturbations. In particular, we identify a class of models where the spectrum of DM density perturbations is sensitive to the pressure-less matter dominated era before BBN, giving rise to interesting astrophysical signatures to be looked for in the future. A worthwhile future direction would be to study well-motivated theoretical models within this framework and carry out detailed studies of the pattern of expected experimental signals.

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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