6533b873fe1ef96bd12d57d4
RESEARCH PRODUCT
Constraints on electromagnetic form factors of sub-GeV dark matter from the cosmic microwave background anisotropy
Soumya RaoGaetano LambiaseAkhilesh NautiyalSubhendra Mohantysubject
PhysicsParticle physicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Magnetic momentScalar (mathematics)Dark matterForm factor (quantum field theory)FOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsHigh Energy Physics - PhenomenologyElectric dipole momentHigh Energy Physics - Phenomenology (hep-ph)Baryon acoustic oscillationsMultipole expansionMagnetic dipoleAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We consider dark matter which have non-zero electromagnetic form factors like electric/magnetic dipole moments and anapole moment for fermionic dark matter and Rayleigh form factor for scalar dark matter. We consider dark matter mass $m_\chi > \cal{ O}({\rm MeV})$ and put constraints on their mass and electromagnetic couplings from CMB and LSS observations. Fermionic dark matter with non-zero electromagnetic form factors can annihilate to $e^+ e^-$ and scalar dark matter can annihilate to $2\gamma$ at the time of recombination and distort the CMB. We analyze dark matter with multipole moments with Planck and BAO observations. We find upper bounds on anapole moment $g_{A}<7.163\times 10^{3} \text{GeV}^{-2}$, electric dipole moment ${\cal D}<7.978\times 10^{-9} \text{e-cm}$, magnetic dipole moment ${\mu}<2.959\times 10^{-7} \mu_B$, and the bound on Rayleigh form factor of dark matter is $g_4/\Lambda_4^2<1.085\times 10^{-2}\text{GeV}^{-2}$ with $95\%$C.L.
year | journal | country | edition | language |
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2021-02-09 | Physical Review D |