Dark matter signals and cosmic ray anomalies in an extended seesaw model

TL;DR

This paper presents an extended seesaw model that explains cosmic ray anomalies and dark matter signals by introducing additional particles, successfully addressing multiple experimental observations in a unified framework.

Contribution

It introduces a novel extended seesaw model with two coexisting dark matter candidates that explains cosmic ray excesses and dark matter signals simultaneously.

Findings

Explains positron and electron flux excesses observed by PAMELA, ATIC, and Fermi-LAT.

Accommodates recent dark matter detection signals in a low-scale leptogenesis framework.

Proposes a model with two-particle dark matter candidates consistent with experimental data.

Abstract

An extended seesaw model proposed to achieve low scale leptogenesis can resolve the excess positron and electron fluxes observed from PAMELA, ATIC and/or Fermi-LAT, and simultaneously accommodate some of recent experimental results for dark matter (DM) signals. In this approach, in addition to SU(2)_L doublet and the (light) singlet Higgs fields, an extra vector-like singlet neutrino and a singlet scalar field, which are coexisting two-particle dark matter candidates, are responsible for the origin of the excess positron and electron fluxes to resolve the PAMELA, ATIC and/or Fermi-LAT anomalies, as well as for the DM signals observed from direct searches in low mass scale.