论文标题
来自散装黑洞的宇宙暗物质
Cosmological Dark Matter from a Bulk Black Hole
论文作者
论文摘要
我们在特定的五维标量重力（即软壁）背景中研究三大桥的宇宙学，称为线性dilaton背景。我们发现Brane-World的Friedmann方程自动包含一个模仿无压物质的术语。我们建议将此术语识别为暗物质。这种暗物质是作为勃板上散装黑洞的投影而产生的，这是通过Weyl张量和标量应力张量的Brane Friedmann方程的贡献。非平凡的物质行为是由于Weyl压力和标量压力之间的精确取消。我们表明，牛顿电位仅接受反向距离平方的轻度短距离校正，从而确保线性dilaton brane-world与观察到的4D重力的兼容性。我们的设置可以被视为对线性dilaton背景中产生的全息理论的一致宇宙学描述。我们还提出了更一般的标量重力模型，其中Brane宇宙学具有有效的能量密度，其行为在暗辐射，暗物质和暗能量之间取决于模型参数，在黑暗辐射，深色物质和深色能量之间插值。
We study the cosmology of a three-brane in a specific five-dimensional scalar-gravity (i.e. soft-wall) background, known as the linear dilaton background. We discover that the Friedmann equation of the brane-world automatically contains a term mimicking pressureless matter. We propose to identify this term as dark matter. This dark matter arises as a projection of the bulk black hole on the brane, which contributes to the brane Friedmann equation via both the Weyl tensor and the scalar stress tensor. The nontrivial matter-like behavior is due to an exact cancellation between the Weyl and scalar pressures. We show that the Newtonian potential only receives a mild short-distance correction going as inverse distance squared, ensuring compatibility of the linear dilaton brane-world with observed 4D gravity. Our setup can be viewed as a consistent cosmological description of the holographic theories arising in the linear dilaton background. We also present more general scalar-gravity models where the brane cosmology features an effective energy density whose behavior smoothly interpolates between dark radiation, dark matter and dark energy depending on a model parameter.
