Cosmological consequences of scalar mesons from gauge/gravity correspondence

TL;DR

This paper investigates the spectrum of scalar mesons in a gauge/gravity duality framework and explores their potential cosmological effects, including the emergence of phantom fields in a universe with a hidden sector.

Contribution

It provides an explicit calculation of the scalar meson Lagrangian in a supergravity dual of a gauge theory and analyzes their cosmological implications.

Findings

Lightest scalar mesons can influence cosmology in a hidden sector.

Phantom fields may naturally arise from these scalar mesons.

Implications for dark energy models in a FRW universe.

Abstract

We consider the spectrum of mesons for the gauge theory dual to a supergravity configuration of intersecting D3/D7 branes, and use the expression for the Lagrangian of the scalar mesons to compute explicitly the Lagrangian for the lightest states in the infrared limit. Assuming that the matter content of this gauge theory is part of a hidden sector, which interacts with the standard model only via gravity, we explore the cosmological consequences of these lightest scalar mesons for a FRW universe. We show that phantom fields may appear naturally in this kind of scenarios.