Low energy bounds on Poincare violation in causal set theory
- Department of Physics, University of California, Davis, California 95616 (United States)
In the causal set approach to quantum gravity, Poincare symmetry is modified by swerving in spacetime, induced by the random lattice discretization of the spacetime structure. The broken translational symmetry at short distances is argued to lead to a residual diffusion in momentum space, whereby a particle can acquire energy and momentum by drift along its mass shell and a system in equilibrium can spontaneously heat up. We consider bounds on the rate of momentum space diffusion coming from astrophysical molecular clouds, nuclear stability and cosmological neutrino background. We find that the strongest limits come from relic neutrinos, which we estimate to constrain the momentum space diffusion constant by k<10{sup -61} GeV{sup 3} for neutrinos with masses m{sub {nu}}>0.01 eV, improving the previously quoted bounds by roughly 17 orders of magnitude.
- OSTI ID:
- 20864162
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 74, Issue 10; Other Information: DOI: 10.1103/PhysRevD.74.106001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Energy-momentum diffusion from spacetime discreteness
NLO+NLL collider bounds, Dirac fermion and scalar dark matter in the B–L model