Cosmological Constant Problems and Renormalization Group

TL;DR

This paper reviews approaches to the Cosmological Constant Problem, focusing on quantum effects and renormalization group methods, highlighting the challenge of fine-tuning vacuum energy in quantum gravity theories.

Contribution

It provides a comprehensive review of existing solutions to the Cosmological Constant Problem, emphasizing the role of renormalization group techniques.

Findings

Renormalization group methods offer insights into vacuum energy behavior.

Quantum loop effects significantly impact the cosmological constant.

Fine-tuning remains a central challenge in resolving the problem.

Abstract

The Cosmological Constant Problem emerges when Quantum Field Theory is applied to the gravitational theory, due to the enormous magnitude of the induced energy of the vacuum. The unique known solution of this problem involves an extremely precise fine-tuning of the vacuum counterpart. We review a few of the existing approaches to this problem based on the account of the quantum (loop) effects and pay special attention to the ones involving the renormalization group.