Non-Critical Liouville String Escapes Constraints on Generic Models of Quantum Gravity

Abstract

It has recently been pointed out that generic models of quantum gravity must contend with severe phenomenological constraints imposed by gravitational Cerenkov radiation, neutrino oscillations and the cosmic microwave background radiation. We show how the non-critical Liouville-string model of quantum gravity we have proposed escapes these constraints. It gives energetic particles subluminal velocities, obviating the danger of gravitational Cerenkov radiation. The effect on neutrino propagation is naturally flavour-independent, obviating any impact on oscillation phenomenology. Deviations from the expected black-body spectrum and the effects of time delays and stochastic fluctuations in the propagation of cosmic microwave background photons are negligible, as are their effects on observable spectral lines from high-redshift astrophysical objects.

15 pages LaTeX, 2 eps figures included

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• Quantum-Gravity Analysis of Gamma-Ray Bursts using Wavelets
• Non-Linear Relativity in Position Space
• Possible astrophysical probes of quantum gravity
• CPT Violation and Decoherence in Quantum Gravity
• Synchrotron Radiation and Quantum Gravity
• Probing the Planck Scale with Neutrino Oscillations
• Quantum fluctuations of lightcone in 4-dimensional spacetime with parallel plane boundaries
• Quasinormal modes of a massive scalar field nonminimally coupled to gravity in the spacetime of Self-Dual Black Hole
• Lorentz and CPT breaking in gamma-ray burst neutrinos from string theory
• Neutrinos and the Phenomenology of CPT Violation
• Probes for String-Inspired Foam, Lorentz, and CPT Violations in Astrophysics
• Effects on neutrino propagation in space-time foam of D-branes revisited
• Constraints to Lorentz violation and ultrahigh-energy electrons in D-foamy space-times
• Einstein-Yang-Mills Regular Black Holes in Rainbow Gravity