COT4 - Quantum Cosmology and Quantum Effects in the Early Universe |
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Speaker |
Bouhmadi Lopez, Mariam |
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Co-autors |
Claus Kiefer, Barbara Sandhofer, and Paulo Vargas Moniz |
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Talk Title |
Defrosting the big freeze quantum mechanically |
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Abstract |
Classical models for dark energy can exhibit a variety of singularities, many of which occur for scale factors much bigger than the Planck length. We address here the issue whether some of these singularities, the big freeze and the big démarrage, can be avoided in quantum cosmology. We use the framework of quantum geometrodynamics. We restrict our attention to a class of models whose matter content can be described by a generalized Chaplygin gas and be represented by a scalar field with an appropriate potential. Employing the DeWitt criterium that the wave function be zero at the classical singularity, we show that a class of solutions to the Wheeler-DeWitt equation fulfilling this condition can be found. We discuss the reasons for the remaining ambiguity in fixing the solution. |
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