Accurate estimate of the relic density and the kinetic decoupling in non-thermal dark matter models

Abstract

Non-thermal dark matter generation is an appealing alternative to the standard paradigm of thermal WIMP dark matter. We reconsider non-thermal production mechanisms in a systematic way, and develop a numerical code for accurate computations of the dark matter relic density. We discuss in particular scenarios with long-lived massive states decaying into dark matter particles, appearing naturally in several beyond the standard model theories, such as supergravity and superstring frameworks. Since non-thermal production favors dark matter candidates with large pair annihilation rates, we analyze the possible connection with the anomalies detected in the lepton cosmic-ray flux by Pamela and Fermi. Concentrating on supersymmetric models, we consider the effect of these non-standard cosmologies in selecting a preferred mass scale for the lightest supersymmetric particle as dark matter candidate, and the consequent impact on the interpretation of new physics discovered or excluded at the LHC. Finally, we examine a rather predictive model, the G2-MSSM, investigating some of the standard assumptions usually implemented in the solution of the Boltzmann equation for the dark matter component, including coannihilations. We question the hypothesis that kinetic equilibrium holds along the whole phase of dark matter generation, and the validity of the factorization usually implemented to rewrite the system of coupled Boltzmann equation for each coannihilating species as a single equation for the sum of all the number densities. As a byproduct we develop here a formalism to compute the kinetic decoupling temperature in case of coannihilating particles, which can be applied also to other particle physics frameworks, and also to standard thermal relics within a standard cosmology.

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• Observation of an anomalous positron abundance in the cosmic radiation
• Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• What mass are the smallest protohalos?
• Search for Supersymmetry in pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy
• Moduli-Induced Gravitino Problem
• Non-thermal Dark Matter and the Moduli Problem in String Frameworks
• Moduli Decays and Gravitinos
• Relic densities including Sommerfeld enhancements in the MSSM
• The $G_2$-MSSM - An $M$ Theory motivated model of Particle Physics
• Explaining the Electroweak Scale and Stabilizing Moduli in M Theory
• Origins of Hidden Sector Dark Matter I: Cosmology
• Ultra-cold WIMPs: relics of non-standard pre-BBN cosmologies
• Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in sqrt{s} = 7 TeV proton-proton collisions with the ATLAS experiment
• Mirage in the Sky: Non-thermal Dark Matter, Gravitino Problem, and Cosmic Ray Anomalies
• Dark Matter as a Guide Toward a Light Gluino at the LHC
• Direct detection of neutralino dark mattter in non-standard cosmologies
• Constraints on Minimal SUSY models with warm dark matter neutralinos

Cited by in corpus (50)

• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• Implications of a 125 GeV Higgs scalar for LHC SUSY and neutralino dark matter searches
• Dark Matter through the Higgs portal
• In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Dark Matter Production in Late Time Reheating
• Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties
• Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe
• Non-thermal Histories and Implications for Structure Formation
• Z-portal dark matter
• Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates
• Dark Matter Production in an Early Matter Dominated Era
• Dark Matter in the minimal Inverse Seesaw mechanism
• The Waning of the WIMP: Endgame?
• Light NMSSM Neutralino Dark Matter in the Wake of CDMS II and a 126 GeV Higgs
• Neutralino Dark Matter in Scenarios with Early Matter Domination
• Light Dark Matter from Entropy Dilution
• Nonthermal production of dark radiation and dark matter
• Confronting the Moduli-Induced LSP Problem
• Gravitino Dark Matter and low-scale Baryogenesis
• An intermediate framework between WIMP, FIMP, and EWIP dark matter
• Dark Matter Dilution Mechanism through the Lens of Large Scale Structure
• Quasidecoupled state for dark matter in nonstandard thermal histories
• Mixed (Cold+Warm) Dark Matter in the Bino-Wino co-annihilation scenario
• GUT Models at Current and Future Hadron Colliders and Implications to Dark Matter Searches
• Smallest Remnants of Early Matter Domination
• Primordial black holes and scotogenic dark matter
• The Dark Sequential Z' Portal: Collider and Direct Detection Experiments
• Cosmology in the presence of multiple light moduli
• Systematic approach to $B$-physics anomalies and $t$-channel dark matter
• Dynamical Dark Matter from Thermal Freeze-Out
• Impact of dark matter self-scattering on its relic abundance
• Lepton Flavor Violation Induced by Dark Matter
• Higgsino Dark Matter in a Non-Standard History of the Universe
• Right-handed Neutrino Dark Matter, Neutrino Masses, and non-Standard Cosmology in a 2HDM
• WIMP isocurvature perturbation and small scale structure
• Light stop in the MSSM after LHC Run 1
• Imprints of Non-thermal Wino Dark Matter on Small-Scale Structure
• A map of the non-thermal WIMP
• Phenomenological consequences of an interacting multicomponent dark sector
• Dark matter and Standard Model reheating from conformal GUT inflation
• Smallest Halos in Thermal Wino Dark Matter
• Affleck-Dine baryogenesis after D-term inflation and solutions to the baryon-DM coincidence problem
• Dark matter signals at the LHC: forecasts from ton-scale direct detection experiments
• Kinetic recoupling of dark matter
• Supersymmetric $\nu$-Inflaton Dark Matter
• Non-thermal production of Higgsino dark matter by late-decaying scalar fields
• Lower bound for the ratio of charged wino tracks to charged lepton tracks at LHC
• Aspects of production and kinetic decoupling of non-thermal dark matter
• Roads for Right-handed Neutrino Dark Matter: Fast Expansion, Standard Freeze-out, and Early Matter Domination