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arXiv 1812.06151gr-qc
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从扩散宇宙学统一DE-DM

Unification of DE-DM from Diffusive Cosmology

David Benisty, Eduardo Guendelman, Zbigniew Haba

摘要:

本文研究了在具有能量扩散转移的动力学时空理论中统一的暗物质和暗能量的广义概念。动力学时空理论引入了一个向量场,其运动方程保证了某个能量动量张量的守恒,这可能与引力能量动量张量有关,但一般来说并不相同。这个特殊的能量动量张量是由作为动力学项的标量场导数和可能的标量场的势的一般组合建立的。通过要求动态空间矢量场是标量的梯度,动态时空理论变成了一个关于扩散相互作用的暗能量和暗物质的理论。这些概括产生非保守的能量动量张量,而不是保守的能量动量张量,这导致在年底制定相互作用的DE-DM。我们解决了分析的理论,我们表明,$Λ$ CDM是这些理论在大的时候一个不动点。一个特殊的情况下,渐近对应于以前研究的非拉格朗日公式的暗能量暗物质之间的扩散交换。

英文摘要:

Generalized ideas of unified dark matter and dark energy in the context of dynamical space time theories with a diffusive transfer of energy are studied. The dynamical space-time theories are introduced a vector field whose equation of motion guarantees a conservation of a certain Energy Momentum tensor, which may be related, but in general is not the same as the gravitational Energy Momentum tensor. This particular energy momentum tensor is built from a general combination of scalar fields derivatives as the kinetic terms, and possibly potentials for the scalar field. By demanding that the dynamical space vector field be the gradient of a scalar the dynamical space time theory becomes a theory for diffusive interacting dark energy and dark matter. These generalizations produce non-conserved energy momentum tensors instead of conserved energy momentum tensors which leads at the end to a formulation for interacting DE-DM. We solved analytically the theories and we show that the $Λ$CDM is a fixed point of these theories at large times. A particular case has asymptotic correspondence to previously studied non-Lagrangian formulations of diffusive exchange between dark energy dark matter.

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