# 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.

## Key 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.

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Source: https://tomesphere.com/paper/1704.08872