Revealing A Trans-Planckian World Solves The Cosmological Constant Problem

TL;DR

This paper proposes a novel approach to quantum gravity that eliminates the cosmological constant problem by leveraging background freedom and conformal symmetry, leading to a zero zero-point energy and a dynamically discretized spacetime.

Contribution

It introduces a background-free quantization method of gravity where the cosmological constant problem is resolved through asymptotic conformal symmetry.

Findings

Zero-point energy vanishes in the proposed framework

Cosmological constant becomes a renormalization group invariant

Spacetime is dynamically discretized with emergent quanta

Abstract

The Planck scale is usually believed to be an unpassable wall. Putting a cutoff there and thinking of it as a quantized spacetime entity shows that. However, this is exactly the cause of many problems in quantum gravity. The cosmological constant problem also comes down to the problem of how to describe a trans-Planckian world by a continuum theory that shall be renormalizable and background free. Here, we show that when quantizing gravity in a diffeomorphism-invariant method, in which background freedom arises asymptotically as an exact conformal symmetry, the zero-point energy vanishes identically. Thus, there is no problem with the cosmological constant, which is a physical constant, namely a renormalization group invariant. We also argue that new quanta based on the background freedom emerge and spacetime is discretized dynamically. Primordial fluctuations will originate from such quanta.