Thermal Goldstino Production with Low Reheating Temperatures

Abstract

We discuss thermal production of (pseudo) goldstinos, the Goldstone fermions emerging from (multiple) SUSY breaking sectors, when the reheating temperature is well below the superpartner masses. In such a case, the production during matter-dominated era induced by inflaton decay stage is more important than after reheating. Depending on the SUSY breaking scale, goldstinos are produced by freeze-in or freeze-out mechanism via $1\to 2$ decays and inverse decays. We solve the Boltzmann equation for the momentum distribution function of the goldstino.In the freeze-out case, goldstinos maintain chemical equilibrium far after they are kinetically decoupled from the thermal bath, and consequently goldstinos with different momentum decouple at different temperatures. As a result their momentum distribution function shows a peculiar shape and the final yield is smaller than if kinetic equilibrium was assumed. We revisit the cosmological implications in both R-parity-conserving and R-parity-violating supersymmetric scenarios. For the former, thermally produced goldstinos can still be abundant enough to be dark matter at present times even if the reheating temperature is low, of order $1$ GeV. For the latter, if the reheating temperature is low, of order $0.1-1$ GeV, they are safe from the BBN constraints.

25 pages, 6 figures

References in corpus (11)

• An Introduction to PYTHIA 8.2
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• From Linear SUSY to Constrained Superfields
• Thermal production of gravitinos
• Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Gamma-Rays from Decaying Dark Matter
• Thermal inflation, baryogenesis and axions
• The Goldstini Variations
• Neutralino and gravitino dark matter with low reheating temperature
• Strong Optimized Conservative Fermi-LAT Constraints on Dark Matter Models from the Inclusive Photon Spectrum
• Axino LSP Baryogenesis and Dark Matter

Cited by in corpus (15)

• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• Freeze-In Dark Matter with Displaced Signatures at Colliders
• When the Universe Expands Too Fast: Relentless Dark Matter
• Dark Matter Freeze-in Production in Fast-Expanding Universes
• Post-Inflationary Gravitino Production Revisited
• A Minimal Model of Gravitino Dark Matter
• Imprint of a scalar era on the primordial spectrum of gravitational waves
• (Non-)thermal production of WIMPs during kination
• Concealing Dirac neutrinos from cosmic microwave background
• Sgoldstino-less inflation and low energy SUSY breaking
• Axino dark matter with low reheating temperature
• Mass-varying Dark Matter from a Phase Transition
• Exploring the Hadronic Axion Window via Delayed Neutralino Decay to Axinos at the LHC
• Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard Cosmology
• Fingerprints of freeze-in dark matter in an early matter-dominated era