Scalar Dark Matter candidates

Abstract

We investigate the possibility that Dark Matter (dm) could be made of scalar candidates and focus, in particular, on the unusual mass range between a few MeV's and a few GeV's. After showing why the Lee-Weinberg limit (which usually forbids a dm mass below a few GeV's) does not necessarily apply in the case of scalar particles, we discuss how light candidates (mdm < O(GeV)) can satisfy both the gamma ray and relic density constraints. We find two possibilities. Either dm is coupled to heavy fermions (but if $mdm\lesssim 100$ MeV, an asymmetry between the dm particle and antiparticle number densities is likely to be required), or dm is coupled to a new light gauge boson U. The (collisional) damping of light candidates is, in some circumstances, large enough to be mentioned, but in most cases too small to generate a non linear matter power spectrum at the present epoch that differs significantly from the Cold Dark Matter spectrum. On the other hand, heavier scalar dm particles (ie with $mdm\gtrsim O(GeV)$) turn out to be much less constrained. We finally discuss a theoretical framework for scalar candidates, inspired from theories with N=2 extended supersymmetry and/or extra space dimensions, in which the dm stability results from a new discrete (or continuous) symmetry.

56 pages, with a new section on theories with an extra U(1) gauge symmetry

References in corpus (1)

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• Recent results on rare decay pi0 to e+e-
• Linking solar bosonic dark matter halos and active neutrinos
• Scalar Dark Matter in light of LEP and ILC Experiments
• An Experiment to Search for Light Dark Matter in Low-Energy ep Scattering
• Super-Kamiokande Strongly Constrains Leptophilic Dark Matter Capture in the Sun
• The KLOE-2 experiment: overview of recent results
• Signature of Sub GeV Dark Matter particles at LHC and TEVATRON
• Diphoton Excess through Dark Mediators
• The dark Stodolsky effect: constraining effective dark matter operators with spin-dependent interactions
• BBN Constraints on the Hadronic Annihilation of sub-GeV Dark Matter
• Wide band spectroscopic response of monocrystallines to low dose neutron and gamma radiation
• Positron Annihilations at the Galactic Center: Generating More Questions Than Answers
• Decoding Dark Matter at future $e^{+}{e}^{-}$ colliders
• Light Dark Matter Detection with Hydrogen-rich Crystals and Low-Tc TES Detectors
• Darker matter generating from the dark
• Putting all the X in one basket: Updated X-ray constraints on sub-GeV Dark Matter
• A possible probe of the new fifth force
• Majorana spinors and extended Lorentz symmetry in four-dimensional theory
• Inelastic Dark Matter at the Fermilab Short Baseline Neutrino Program
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism
• SZ effects from annihilating dark matter in the Milky Way: smooth halo, subhalos and intermediate-mass-black-holes
• New Physics contamination to precision luminosity measurements at future $e^{+}{e}^{-}$ colliders
• Searching for light WIMPS in view of neutron decay to dark matter
• Helium reionization in the presence of self-annihilating clumpy dark matter
• Layered dark structure with a Structuring Field: A $Z_4$-symmetric Inert Doublet-Singlet realization and implications for the $S_8$ tension
• Letter of Intent: The Forward Physics Facility
• SENSEI: A Search for Diurnal Modulation in sub-GeV Dark Matter Scattering
• Indirect detection of long-lived particles in a rich dark sector with a dark vector portal
• Cosmological constraints on Neutrino - Dark Matter interactions
• Leptons and other forces of Nature
• Semi-Visible Dark Photon Phenomenology at the GeV Scale
• WIMP Dark Matter within the dark photon portal
• INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B-L$ and $L_i-L_j$ Vectors
• Electron Beam Dump Constraints on Light Bosons with Lepton Flavor Violating Couplings
• The Forward Physics Facility at the High-Luminosity LHC
• Constraints on Kinetic Mixing of Dark Photons from Dilepton Spectra
• Earth-Scattering Induced Modulation in Low-Threshold Dark Matter Experiments
• Plausible constraints and inflationary production for dark photons
• Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. dwarf spheroidal galaxy
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model
• Uniqueness of gravitational constant at low energies from the connection between spin-2 and spin-0 sectors
• Muon $g-2$, dark matter, and neutrino mass explanations in a modular $A_4$ symmetry
• B boson search at KLOE/KLOE-2
• Stellar Light Scattering as a Probe for a Braneworld-Induced Baryogenesis Scenario
• The Dark Photon: a 2026 Perspective
• Vector Portal Pseudo-Goldstone Dark Matter
• Hadrophilic Light Dark Matter from the Atmosphere
• Light dark forces at flavor factories
• Searching for light WIMPS via their interaction with electrons
• Production of Dark Photons through Higher Electromagnetic Moments at LDMX: Simulations and Model Discrimination
• Hydrogenated carbon structures as directional sub-GeV dark matter detectors
• Constraints on the $U(1{)}_{B-L}$ model from global QCD analysis
• On the dark matter origin of an LDMX signal
• Contributions to $Z^0$ decays from a X17 extension of the Standard Model
• Dark top partner
• Non-Newtonian gravity in finite nuclei