L{\alpha} line of dark positronium as nongravitational detection of dark matter

TL;DR

This paper explores the potential for detecting dark matter through atomic dark matter lines, specifically dark positronium, by analyzing gamma-ray excesses and predicting observable spectral lines.

Contribution

It predicts new atomic dark matter spectral lines, especially the Lα line of dark positronium near 3 GeV, and discusses their potential observability in astrophysical data.

Findings

Possible detection of a 3 GeV gamma-ray line from dark positronium

Prediction of a 300 TeV annihilation line of dark positronium

Observation prospects of Hα line from positronium near Galactic Center

Abstract

An attempt to predict the new atomic dark matter lines is done on the example of a dark lepton atom - positronium. Its Layman-alpha line with the energy near 3 GeV may be observable if the appropriate conditions realize. For this we have studied a {\gamma}-ray excess in the Center of our Galaxy. In principle, this excess may be produced by the L{\alpha} line of a dark positronium in the medium with Compton scattering. The possibility of observations of an annihilation line (E~300 TeV) of dark positronium is also predicted. Other proposals to observe the atomic dark matter are shortly described. Besides, H{\alpha} line (1.3{\mu}) of usual positronum must be observable in the direction on the Center of our Galaxy.