Invisible Axion-Like Dark Matter from Electroweak Bosonic Seesaw

TL;DR

This paper proposes a model where a light, axion-like particle arising from a strongly coupled sector explains dark matter, with potential detection via microwave cavity experiments and implications for collider phenomenology.

Contribution

It introduces a novel electroweak symmetry breaking mechanism involving a bosonic seesaw and predicts a light, invisible axion-like dark matter candidate with specific cosmological and experimental signatures.

Findings

The dark matter candidate s has a mass between 10^{-4} eV and 1 eV.

The relic abundance can be explained by coherent oscillation.

Potential detection in microwave cavity experiments is feasible.

Abstract

We explore a model based on the classically-scale invariant standard model (SM) with a strongly coupled vector-like dynamics, which is called hypercolor (HC). The scale symmetry is dynamically broken by the vector-like condensation at the TeV scale, so that the SM Higgs acquires the negative mass-squared by the bosonic seesaw mechanism to realize the electroweak symmetry breaking. An elementary pseudoscalar $S$ is introduced to give masses for the composite Nambu-Goldstone bosons (HC pions): the HC pion can be a good target to explore through a diphoton channel at the LHC. As the consequence of the bosonic seesaw, the fluctuating mode of $S$, which we call $s$, develops tiny couplings to the SM particles and is predicted to be very light. The $s$ predominantly decays to diphoton and can behave as an invisible axion-like dark matter. The mass of the $s$-dark matter is constrained by currently available cosmological and astrophysical limits to be $10^{-4} {\rm eV} \lesssim m_s \lesssim 1 \,{\rm eV}$. We find that the sufficient amount of relic abundance for the $s$-dark matter can be accumulated via the coherent oscillation. The detection potential in microwave cavity experiments is also addressed.