Time evolution of T_{\mu\nu} and the cosmological constant problem

TL;DR

This paper investigates how the effective quantum field theory energy-momentum tensor evolves over cosmic time, suggesting that vacuum energy diminishes and potentially addressing the cosmological constant problem.

Contribution

It demonstrates that the structure of T_{ u} causes vacuum energy to decrease over time, offering a new perspective on the cosmological constant problem.

Findings

Vacuum energy decreases with cosmic evolution.

Zero point energy is washed out by cosmological dynamics.

Implications for resolving the cosmological constant problem.

Abstract

We study the cosmic time evolution of an effective quantum field theory energy-momentum tensor T_{\mu\nu} and show that, as a consequence of the effective nature of the theory, the structure of T_{\mu\nu} is such that the vacuum energy decreases with time. We find that the zero point energy at present time is washed out by the cosmological evolution. The implications of this finding for the cosmological constant problem are investigated.