Modification of black-body radiance at low temperatures and frequencies

TL;DR

This paper investigates how SU(2) effects modify the low-frequency radiance spectrum of black-body radiation at low temperatures, highlighting a spectral gap and the influence of electric fields on emission laws.

Contribution

It provides a detailed analysis of the low-frequency radiance spectrum under SU(2) modifications and proposes a method to measure these deviations using electric fields.

Findings

Spectral gap (total screening) is the main observable effect.

Strong static electric fields enforce Planck's law at low frequencies.

Potential experimental approach to detect SU(2) deviations.

Abstract

In contrast to earlier reports, where the spectrum of the {\sl energy density} of photonic black-body radiation modified by SU(2) effects was discussed, we discuss the low-frequency spectrum of the {\sl radiance} at temperatures ranging between 5 and 20 Kelvin. We conclude that compared to the conventional theory the only observable effect is associated with the spectral gap (total screening). We also discuss how a low-temperature black body cavity under the influence of a sufficiently strong static electric field is forced to emit according to Planck's radiation law (pure U(1) theory) even at low frequencies and how this effect can be utilized to measure SU(2) induced deviations.