An Uneven Vacuum Energy Fluid as Dark Matter & Gravitational Lens
نویسنده
چکیده
Various TeVeS-inspired and f(R)-inspired theories of gravity have added an interesting twist to the search for dark matter and vacuum energy, modifying the landscape of astrophysics day by day. A common thread of various theories, according of an up-todate summary by HZL 1, is a non-uniform vector field, describing an uneven vacuum energy fluid. The so-called ”alternative” gravity theories are in fact in the standard GR gravity framework except that the cosmological ”constant” is replaced by a non-trivial non-uniform vacuum energy, which couples the effects of Dark Matter and Dark Energy together by a single field. Built initially bottom-up rather than top-down as most gravity theories, TeVeS-inspired theories are healthily rooted on empirical facts. Here I attempt a review of some sanity checks of these fast-developing theories from galaxy rotation curves, solar system constraints, and gravitational lensing. I will also discuss some theoretical aspects of these theories related to the vacuum energy, and point out some analogies with electromagnetism and the Casimir effect.
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تاریخ انتشار 2008