Non-Thermal Production of Sexaquark Dark Matter

Abstract

Standard thermal freeze-out scenarios with QCD-scale interaction rates predict a $uuddss$ sexaquark relic abundance many orders of magnitude below the observed dark matter density, representing a key challenge for sexaquark dark matter models. Additionally, if the maximum post-inflationary temperature never exceeds the QCD confinement scale, the usual thermal/chemical-equilibrium production of the sexaquark near $T\sim T_{\mathrm{QCD}}\simeq 150-170$ MeV never occurs. In this work we show that non-thermal mechanisms can naturally overcome this obstacle. Using late-decaying reheatons as a representative case (while noting the broader applicability), we demonstrate that the final abundance is determined by two quantities: the branching fraction into strange-quark-rich matter and the coalescence probability into sexaquarks during the matter-dominated or early radiation-dominated epoch. We provide compact expressions and benchmark calculations for reheating temperatures $T_R\in [10,100]$ MeV and reheaton masses above the QCD confinement scale. Unlike the predictive but unsuccessful thermal scenario, non-thermal production is sensitive to injection microphysics, coalescence efficiency, and residual entropy dilution. We delineate the viable parameter space, evaluate collider and precision constraints on representative reheaton models, and derive indirect detection bounds on residual antisexaquark populations. Our results establish non-thermal production as a viable pathway to sexaquark dark matter and highlight broader implications for non-equilibrium mechanisms in the early universe.

arXiv comment22 pages, 3 figures, comments welcome

References in corpus (53)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Electric dipole moments as probes of new physics
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Baryogenesis from Flat Directions of the Supersymmetric Standard Model
• Largest temperature of the radiation era and its cosmological implications
• Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
• QCD forces and heavy quark bound states
• MeV-scale Reheating Temperature and Thermalization of Neutrino Background
• Reheating in Inflationary Cosmology: Theory and Applications
• What is the lowest possible reheating temperature?
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• Strangeness in nuclear physics
• Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck
• Standard Model CP-violation and Baryon asymmetry
• Electroweak Baryogenesis and Standard Model CP Violation
• The Nf=0 heavy quark potential from short to intermediate distances
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• A new bound on the electron's electric dipole moment
• Bounds on very low reheating scenarios after Planck
• A new determination of the extragalactic diffuse gamma-ray background from EGRET data
• Bound H-dibaryon in Flavor SU(3) Limit of Lattice QCD
• Coalescence and flow in ultra-relativistic heavy ion collisions
• The Origin of the Extragalactic Gamma-Ray Background and Implications for Dark-Matter Annihilation
• Asymmetric WIMP dark matter
• Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Upsilon -> gamma A0
• Phenomenology of a very light scalar (100 MeV $<m_h<$ 10 GeV) mixing with the SM Higgs
• Baryogenesis at Low Reheating Temperatures
• Strange freezeout
• Baryogenesis and Late-Decaying Moduli
• Weakly bound $H$ dibaryon from SU(3)-flavor-symmetric QCD
• Chemical Freeze-out of Strange Particles and Possible Root of Strangeness Suppression
• Measurement of exclusive ${\rm Y}$ photoproduction from protons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Sexaquark dilemma in neutron stars and its solution by quark deconfinement
• H dibaryon in the QCD sum rule
• Dark Matter in the Standard Model?
• The Scalar Hexaquark $uuddss$: a Candidate to Dark Matter?
• Current constraints on cosmological scenarios with very low reheating temperatures
• Dibaryons cannot be the dark matter
• LHCb potential to discover long-lived new physics particles with lifetimes above 100 ps
• A Deeply Bound Dibaryon is Incompatible with Neutron Stars and Supernovae
• CALPAGAN: Calorimetry for Particles using GANs
• On the cosmology and terrestrial signals of sexaquark dark matter
• Search for neutral long-lived particles that decay into displaced jets in the ATLAS calorimeter in association with leptons or jets using $pp$ collisions at $\sqrt{s}=13$ TeV
• Electroweak interacting dark matter with a singlet scalar portal
• Search for low-mass resonances decaying into two jets and produced in association with a photon or a jet at $\sqrt{s}=13$ TeV with the ATLAS detector
• Thermal production of sexaquarks in heavy-ion collisions
• Running anomalous dimensions in holographic QCD: from the proton to the sexaquark
• The diffuse extragalactic gamma-ray background radiation: star-forming galaxies are not the dominant component
• Coalescence production of sexaquark with three diquarks in high-energy nuclear collisions

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