Astrophysical constraints on Planck scale dissipative phenomena

Abstract

The emergence of a classical spacetime from any quantum gravity model is still a subtle and only partially understood issue. If indeed spacetime is arising as some sort of large scale condensate of more fundamental objects then it is natural to expect that matter, being a collective excitations of the spacetime constituents, will present modified kinematics at sufficiently high energies. We consider here the phenomenology of the dissipative effects necessarily arising in such a picture. Adopting dissipative hydrodynamics as a general framework for the description of the energy exchange between collective excitations and the spacetime fundamental degrees of freedom, we discuss how rates of energy loss for elementary particles can be derived from dispersion relations and used to provide strong constraints on the base of current astrophysical observations of high energy particles.

5 pages, 1 figure. v2: Minor revisions. Accepted for publication in Phys. Rev. Lett

References in corpus (2)

• Tests of Lorentz invariance: a 2013 update
• Dissipation in the effective field theory for hydrodynamics: First order effects

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