Observable consequences of quantum gravity: Can light fermions exist?

Details Observable consequences of quantum gravity: Can light fermions exist? Observable consequences of quantum gravity: Can light fermions exist?

2011-09-17

arxiv.org/abs/1109.3784v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, based on a talk given at Loops '11, Madrid, to appear in Journal of Physics: Conference Series (JPCS)

Scientific paper

Any theory of quantum gravity must ultimately be connected to observations. This demand is difficult to be met due to the high energies at which we expect the quantum nature of gravity to become manifest. Here we study, how viable quantum gravity proposals can be restricted by investigating the interplay of gravitational and matter degrees of freedom. Specifically we demand that a valid quantum theory of gravity must allow for the existence of light (compared to the Planck scale) fermions, since we observe these in our universe. Within the effective theory framework, we can thus show that UV completions for gravity are restricted, regardless of the details of the microscopic theory. Specialising to asymptotically safe quantum gravity, we find indications that universes with light fermions are favoured within this UV completion for gravity.

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