Composite pseudo Nambu Goldstone Quintessence

TL;DR

This paper explores a composite pseudo-Nambu Goldstone boson as a quintessence candidate for dark energy, deriving its potential from loop interactions and testing its cosmological viability against recent observational data.

Contribution

It introduces a novel composite pNGB quintessence model based on $SO(N)/SO(N-1)$ symmetry breaking, with a calculable Coleman-Weinberg potential, and demonstrates its consistency with current cosmological observations.

Findings

Model favors sub-Planckian decay constants.

Predicts cosmological parameters within observational bounds.

Provides a motivated dark energy candidate consistent with data.

Abstract

A pseudo-Nambu Goldstone Boson (pNGB) arising from the breaking of a global symmetry ($G\rightarrow H$) can be one of the most promising candidates for the quintessence model, to explain the late-time acceleration of our universe. Motivated from the Composite Higgs scenario, we have investigated the case where the pNGB associated with $SO(N)/ SO(N-1)$ develops a potential through its couplings with the particles that do not form the complete representations of $G$. The Coleman Weinberg (CW) potential is generated via the external particles in the loop which are linked with the strongly interacting dynamics and can be computed predicatively. The model of Dark Energy (DE) is tested against several latest cosmological observations such as supernovae data of Pantheon, Baryon Acoustic Oscillation (BAO), Redshift-space distortion (RSD) data, etc. We have found that the fit prefers the sub-Planckian value of the pNGB field decay constant. Moreover, we have found that the model predicts cosmological parameters well within the allowed range of the observation and thus gives a well-motivated model of quintessence.