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

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

2001-08-17

arxiv.org/abs/astro-ph/0108295v1

Phys.Rev.D65:064007,2002

Astronomy and Astrophysics

Astrophysics

15 pages LaTeX, 2 eps figures included

Scientific paper

10.1103/PhysRevD.65.064007

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.

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