Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
41 pages, invited lectures at the International School on Cosmology, Kish Island, Iran, Jan. 22 - Feb. 4 1999, to be publ. in
Scientific paper
We review a few off-the-beaten-track ideas in cosmology. They solve a variety of fundamental problems; also they are fun. We start with a description of non-singular dilaton cosmology. In these scenarios gravity is modified so that the Universe does not have a singular birth. We then present a variety of ideas mixing string theory and cosmology. These solve the cosmological problems usually solved by inflation, and furthermore shed light upon the issue of the number of dimensions of our Universe. We finally review several aspects of the varying speed of light theory. We show how the horizon, flatness, and cosmological constant problems may be solved in this scenario. We finally present a possible experimental test for a realization of this theory: a test in which the Supernovae results are to be combined with recent evidence for redshift dependence in the fine structure constant.
Brandenberger Robert H.
Magueijo Joao
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