Long-Range Quantum Gravity

Abstract

It is a tantalising possibility that quantum gravity (QG) states remaining coherent at astrophysical, galactic and cosmological scales could exist and that they could play a crucial role in understanding macroscopic gravitational effects. We explore, using only general principles of General Relativity, quantum and statistical mechanics, the possibility of using long-range QG states to describe black holes. In particular, we discuss in a critical way the interplay between various aspects of long-range quantum gravity, such as the holographic bound, classical and quantum criticality and the recently proposed quantum thermal generalisation of Einstein's equivalence principle. We also show how black hole thermodynamics can be easily explained in this framework.

A quantum state for the late Universe

“…In particular, we shall find that the coherent state |g necessarily contains a contribution from "soft scalar gravitons" 2 corresponding to the dark force found in Refs. [7][8][9], which can reproduce the phenomenology at galactic scales usually attributed to the presence of DM. In fact, we shall explicitly show the connection with Milgrom's Modified Newtonian Dynamics (MOND) [10] in Section 3.…”

Bootstrapped Newtonian cosmology and the cosmological constant problem

“…Other space-times equipped with horizons have been studied within this scenario. In particular, one can apply arguments similar to the one above for black holes to the de Sitter space [3,[7][8][9][10][11], embedding inflation and the late-time evolution of the Universe within a single theoretical paradigm. This corpuscular picture of the Universe further allows one to explain the dark matter phenomenology as the response of the cosmological condensate of gravitons, responsible for the quasi-de Sitter behaviour at large scale, to the local presence of impurities, i.e.…”