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Intrinsically symmetric cosmological model in the presence of dissipative fluids
International Journal of Modern Physics D ( IF 2.2 ) Pub Date : 2021-02-25 , DOI: 10.1142/s0218271821500334
Eduardo Bittencourt 1 , Leandro Gomes 1 , Grasiele Santos 1
Affiliation  

Based upon the intrinsic symmetries approach to inhomogeneous cosmologies, we propose an exact solution to Einstein’s field equations where the spatial sections are flat and the source is a nonperfect fluid such that the dissipative terms can be written in terms of spatial gradients of the energy density under a suitable choice of the coordinate system. It is shown through the calculation of the luminosity distance as a function of the redshift that the presence of such inhomogeneities may lead to an effective deceleration parameter compatible with either the standard ΛCDM model or LTB models depending on the choice of boundary conditions with no exotic matter. This fact is another evidence that different inhomogeneous models should be carefully investigated in order to verify which model may be compatible with observations and still be as close as possible to the standard model regarding the underlying assumptions, without resorting necessarily to exotic matter components.

中文翻译:

存在耗散流体的本征对称宇宙学模型

基于非均匀宇宙学的内在对称性方法,我们提出了爱因斯坦场方程的精确解,其中空间截面是平坦的,源是非完美流体,因此耗散项可以用能量密度的空间梯度来写合适的坐标系选择。通过计算作为红移函数的光度距离表明,这种不均匀性的存在可能导致有效的减速参数与任一标准兼容ΛCDM 模型或 LTB 模型取决于边界条件的选择,没有外来物质。这一事实是另一个证据,表明应该仔细研究不同的非均匀模型,以验证哪个模型可能与观察结果兼容,并且在基本假设方面仍尽可能接近标准模型,而不必求助于奇异物质成分。
更新日期:2021-02-25
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