Dark Matter with Time-Varying Leptophilic Couplings

TL;DR

This paper proposes a model where dark matter couplings to leptons increase over time, potentially explaining cosmic ray data anomalies by producing a red-shift dependent annihilation signal with evolving strength and final states.

Contribution

It introduces a novel mechanism of time-varying dark matter-lepton couplings via dynamic localization in extra dimensions, addressing key issues in interpreting cosmic ray signals.

Findings

Couplings grow with time, matching cosmic ray data.

Predicts a red-shift dependent annihilation signal.

Addresses the large cross section and leptonic dominance problems.

Abstract

Two general problems arise when interpreting the recent cosmic ray data as signals of Dark Matter (DM) annihilation: (i) the required cross section is too large by O(100), and (ii) the annihilation products seem to be mostly leptonic. We propose to address these two problems by assuming that the couplings of DM to leptons grow with time. This can be achieved by a dynamic localization of DM in extra dimensions. A possible outcome of this proposal is a time (red-shift) dependent annihilation signal, in terms of strength and dominant final states.