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Baryogenesis in Models with a Low Quantum Gravity Scale

Karim Benakli, Sacha Davidson

Abstract

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.

Baryogenesis in Models with a Low Quantum Gravity Scale

Abstract

We make generic remarks about baryogenesis in models where the scale 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 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 , and illustrate with a toy model the possibility of using horizontal family symmetries to circumvent them.

Paper Structure

This paper contains 10 sections, 25 equations, 1 figure, 2 tables.

Table of Contents

  1. Introduction
  2. Baryon number violating operators
  3. Inflation and reheating
  4. Inflation
  5. Gravitons production constraints on $T_{reh}$
  6. Baryogenesis
  7. Challenges for baryogenesis models
  8. A contrived baryogenesis model
  9. Other possibilities
  10. Conclusion

Figures (1)

  • Figure 1: Maximum allowed reheat temperature $T_{reh}$ as a function of $m_{pl(n+4)}$ for different numbers $n$ of large extra dimensions.