Dodelson Scott, Liguori Michele
Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.
Phys Rev Lett. 2006 Dec 8;97(23):231301. doi: 10.1103/PhysRevLett.97.231301. Epub 2006 Dec 7.
One of the prime pieces of evidence for dark matter is the observation of large overdense regions in the Universe. To account for this observation, perturbations had to have grown since recombination by a factor greater than (1+z*) approximately 1180 where z* is the epoch of recombination. This enhanced growth does not happen in general relativity, and so dark matter is needed in the standard theory. We show here that enhanced growth can occur in alternatives to general relativity, in particular, in Bekenstein's relativistic version of modified Newtonian dynamics.
暗物质的首要证据之一是对宇宙中大型高密度区域的观测。为了解释这一观测结果，自复合以来，微扰必须增长到大于（1 + z*）约1180的因子，其中z*是复合时期。在广义相对论中，这种增强的增长一般不会发生，因此标准理论中需要暗物质。我们在此表明，在广义相对论的替代理论中，特别是在贝肯斯坦的相对论版本的修正牛顿动力学中，可以发生增强的增长。
