A Vacuum of Quantum Gravity That is Ether.

Abstract

The fact that quantum gravity does not admit a co-variant vacuum state has far-reaching consequences for all physics. It points out that
 space could not be empty, and we return to the notion of an
 ether . Such a concept requires a preferred reference frame for, e.g., universe expansion and black holes. Here, we intend to discuss vacuum and quantum gravity from three essential viewpoints: universe expansion, black holes existence, and quantum decoherence.

Quantum Cosmology in $f(Q)$ theory

“…Although quantum cosmology is expected to be related to a reduced version of quantum gravity, the fact that we still lack a complete theory of the latter, leaves the theoretical interpretation of quantum cosmology open to debate [1]. The initial value problem of cosmology, the inflationary scenario, the initial cosmological singularity, and the derivation of the quantum state of the universe are only a few of the open problems which quantum cosmology attempts to address [2][3][4][5][6][7].…”