Physics – Atomic Physics
Scientific paper
2008-02-12
Eur.Phys.J.ST 163:297-313,2008
Physics
Atomic Physics
17 pages pdflatex, proceedings of introductory lecture for ACFC Seminar, Bad Honnef 2007, to be published in EPJ Special Topic
Scientific paper
10.1140/epjst/e2008-00826-4
The Standard Model of particle physics and the theory of General Relativity (GR) currently provide a good description of almost all phenomena of particle physics and gravitation that have received controlled experimental tests. However, the Standard Model contains many a priori variable parameters whose values, and whose apparent (near-)constancy, have yet to receive a convincing theoretical explanation. At the same time, GR may now require to be extended or altered at the largest length scales, to account for the recent apparent accelerated cosmological expansion. In this introductory review I present theoretical aspects of the search for explanations of the values and possible variations of fundamental ``constants'', focusing on the possibility of unification of interactions. I also relate cosmological variations to modifications of gravity both locally and cosmologically.
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