Multi-messenger FIMP

Abstract

We propose a multi-messenger frontier probe of non-thermal or freeze-in massive particle (FIMP) dark matter (DM) by considering an effective field theory (EFT) setup. Assuming leptophilic operators connecting DM with the standard model (SM) bath, we consider DM mass ($m_{\mathrm{DM}}$) and the reheat temperature of the Universe ($T_{\mathrm{rh}}$) in a regime which prevents DM-SM thermalisation. Low $T_{\mathrm{rh}}$ allows sizeable DM-SM interactions even for non-thermal DM allowing the latter to be probed at direct, indirect detection frontiers as well as future electron-positron and muon colliders. An extended reheating period governed by monomial inflaton potential after its slow-roll phase not only generates the required abundance of non-thermal DM via ultraviolet (UV) freeze-in but also brings the scale-invariant primordial gravitational waves (GW) within reach of near future experiments across a wide range of frequencies. While particle physics experiments can probe $T_{\mathrm{rh}}\sim O(10)$ GeV and FIMP DM with mass $m_{\mathrm{DM}}\sim O(1)$ TeV, future GW detectors are sensitive to a much wider parameter space.

36 pages, 16 captioned figures, improved discussions; accepted for publication in JHEP

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Cited by in corpus (4)

• Probing displaced (dark)photons from low reheating freeze-in at the LHC
• Seasons of Dark Matter Freeze-In Shaped by the Weather of the Early Universe
• Probing ALP-portal fermionic dark matter at the $e^{+}{e}^{-}$ colliders
• Freeze-In Dark Matter and Leptogenesis: a ${\psi }^{\prime }$SM route