In this paper we study the consistency of a cosmological model representing a universe filled with a one-component dissipative dark matter fluid, in the framework of the causal Israel–Stewart theory, where a general expression arising from perturbation analysis for the relaxation time [Formula: see text] is used. This model is described by an exact analytic solution recently found in [N. Cruz, E. González and G. Palma, Gen. Relat. Gravit. 52, 62 (2020), which depends on several model parameters as well as integration constants, allowing the use of Type Ia Supernovae and Observational Hubble data to perform by an astringent observational tests. The constraint regions found for the parameters of the solution allow the existence of an accelerated expansion of the universe at late times, after the domination era of the viscous pressure, which holds without the need of including a cosmological constant. Nevertheless, the fitted parameter values lead to drawbacks as a very large non-adiabatic contribution to the speed of sound, and some inconsistencies, not totally conclusive, with the description of the dissipative dark matter as a fluid, which is nevertheless a common feature of these kind of models.

中文翻译：

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在因果热力学中测试耗散暗物质

在本文中，我们在因果以色列-斯图尔特理论的框架内研究了代表充满单组分耗散暗物质流体的宇宙的宇宙学模型的一致性，其中由弛豫时间的扰动分析产生的一般表达式[公式: 见正文] 被使用。该模型由最近在 [N. Cruz, E. González 和 G. Palma, Gen. Relat。重力。52, 62 (2020)，这取决于几个模型参数以及积分常数，允许使用 Ia 型超新星和观测哈勃数据来执行收敛观测测试。为解的参数找到的约束区域允许在粘性压力主导时代之后的晚期宇宙加速膨胀的存在，不需要包括宇宙学常数就成立。然而，拟合的参数值会导致缺点，因为对声速的非绝热贡献非常大，并且与将耗散暗物质描述为流体存在一些不一致，并不完全确定，但这仍然是这类模型。