micrOMEGAs3.1 : a program for calculating dark matter observables

TL;DR

micrOMEGAs 3.1 expands a comprehensive toolkit for calculating dark matter observables across several beyond-Standard-Model scenarios. It generalizes relic-density computations to cover asymmetric DM and semi-annihilation, incorporates three-body final states, and refines cosmological thermodynamics, while adding neutrino-telescope signatures, DM clump handling, and loop-induced Higgs processes. The paper details new modules, interfaces to HiggsBounds and external codes, and supports NMSSM and other models with improved Higgs sector treatment and model-independent observables. Collectively, these updates enhance the accuracy and breadth of predictions for direct and indirect detection, collider constraints, and multi-messenger signals in DM phenomenology.

Abstract

micrOMEGAs is a code to compute dark matter observables in generic extensions of the standard model. This new version of micrOMEGAs is a major update which includes a generalization of the Boltzmann equations to accommodate models with asymmetric dark matter or with semi-annihilation and a first approach to a generalization of the thermodynamics of the Universe in the relic density computation. Furthermore a switch to include virtual vector bosons in the final states in the annihilation cross sections or relic density computations is added. Effective operators to describe loop-induced couplings of Higgses to two-photons or two-gluons are introduced and reduced couplings of the Higgs are provided allowing for a direct comparison with recent LHC results. A module that computes the signature of DM captured in celestial bodies in neutrino telescopes is also provided. Moreover the direct detection module has been improved as concerns the implementation of the strange "content" of the nucleon. New extensions of the standard model are included in the distribution.

Figures (3)

• Figure 1: $\Omega h^2$ as a function of $\Delta Y$ for different DM masses in the 4th generation Dirac neutrino dark matter model for DM masses of $3,6,10,50,100$ GeV as indicated.
• Figure 2: Left panel : Values of $h_{eff}$ as a function of T for different QCD equation of states, corresponding to the default micrOMEGAs table with $T_{QCD}=150{\rm MeV}$ (black/full), and to case B (blue/dot-dash), B2(red/dash), B3(dot/green) of Ref. Hindmarsh:2005ix. Right panel : Relative difference between $\Omega h^2$ computed with the default table for $h_{eff}$ and cases B,B2,B3, same color code as left panel.
• Figure 3: Left panel : $\Omega h^2$ as a function of $M_{DM}$ in the MSSM (full) and relative difference between the 3-body and 2-body value (dash). The soft parameters used are specified in the text. Right panel : $\Omega h^2$ as a function of $M_{DM}$ in the IDM including the 3-body final states (full) and only 2-body final states (dash).