On the nature of quantum gravity

TL;DR

This paper explores quantum gravity by analyzing accelerated quantum fields in momentum space, showing that their interactions distinguish flat from curved spacetime and that gravity can be viewed as an entropic force.

Contribution

It introduces a novel approach where interactions of accelerated quantum fields in momentum space elucidate the nature of quantum gravity and spacetime curvature.

Findings

Accelerated fields' interactions differentiate flat and curved spacetime.

Massive objects emit black-body radiation at inverse mass temperature.

Hawking radiation naturally emerges from quantized spacetime theory.

Abstract

It was recently advanced the argument that Unruh effect emerges from the study of quantum field theory in quantum space-time. Quantum space-time is identified with the Hilbert space of a new kind of quantum fields, the accelerated fields, which are defined in momentum space. In this work, we argue that the interactions between such fields offer a clear distinction between flat and curved space-times. Free accelerated fields are associated with flat spacetime, while interacting accelerated fields with curved spacetimes. Our intuition that quantum gravity arises via field interactions is verified by invoking quantum statistics. Studying the Unruh-like effect of accelerated fields, we show that any massive object behaves as a black body at temperature which is inversely proportional to its mass, radiating space-time quanta. With a heuristic argument, it is shown that Hawking radiation naturally arises in a theory in which space-time is quantized. Finally, in terms of thermodynamics, gravity can be identified with an entropic force guaranteed by the second law of thermodynamics.