Baryogenesis in Models with a Low Quantum Gravity Scale

Details Baryogenesis in Models with a Low Quantum Gravity Scale Baryogenesis in Models with a Low Quantum Gravity Scale

1998-10-07

arxiv.org/abs/hep-ph/9810280v2

Phys.Rev.D60:025004,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, latex, one figure. References added

Scientific paper

10.1103/PhysRevD.60.025004

We make generic remarks about baryogenesis in models where the scale $M_s$ of quantum gravity is much below the Planck scale. These correspond to M-theory vacua with a large volume for the internal space. Baryogenesis is a challenge, particularly for $M_s \lappeq 10^5$ GeV, because there is an upper bound on the reheat temperature of the Universe, and because certain baryon number violating operators must be suppressed. We discuss these constraints for different values of $M_s$, and illustrate with a toy model the possibility of using horizontal family symmetries to circumvent them.

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