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Speaker |
Dent, Thomas |
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Co-autors |
S. Stern, C. Wetterich |
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Talk Title |
Time variation of fundamental couplings and dynamical dark energy |
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Abstract |
Scalar field dynamics may give rise to a nonzero cosmological variation of fundamental constants. Within different scenarios based on the unification of gauge couplings, the various claimed observations and bounds may be combined in order to trace or restrict the time history of the couplings and masses. If the scalar field is responsible for a dynamical dark energy or quintessence, cosmological information becomes available for its time evolution. We compute bounds on the present rate of coupling variation from experiments testing the differential accelerations for bodies with equal mass and different composition (WEP) and compare the sensitivity of various methods. In particular, we discuss two specific models of scalar evolution: crossover quintessence and growing neutrino models. |
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