Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line

Abstract

A two component model of nonthermal dark matter is formulated to simultaneously explain the Fermi-LAT results indicating a $\gamma$-ray excess observed from our Galactic Centre in the 1-3 GeV energy range and the detection of an X-ray line at 3.55 keV from extragalactic sources. Two additional Standard Model singlet scalar fields $S_2$ and $S_3$ are introduced. These fields couple among themselves and with the Standard Model Higgs doublet $H$. The interaction terms among the scalar fields, namely $H$, $S_2$ and $S_3$, are constrained by the application of a discrete ${\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime }$ symmetry which breaks softly to a remnant ${\mathbb{Z}}_2^{\prime \prime }$ symmetry. This residual discrete symmetry is then spontaneously broken through an MeV order vacuum expectation value $u$ of the singlet scalar field $S_3$. The resultant physical scalar spectrum has the Standard Model like Higgs as ${\chi }_{{}_{{}_1}}$ with $M_{{\chi }_{{}_{{}_1}}}\sim 125$ GeV, a moderately heavy scalar ${\chi }_{{}_{{}_2}}$ with $50\mathrm{GeV}\le M_{{\chi }_{{}_{{}_2}}}\le 80\mathrm{GeV}$ and a light ${\chi }_{{}_{{}_3}}$ with $M_{{\chi }_{{}_{{}_3}}}\sim 7$ keV. There is only tiny mixing between ${\chi }_{{}_{{}_1}}$ and ${\chi }_{{}_{{}_2}}$ as well as between ${\chi }_{{}_{{}_1}}$ and ${\chi }_{{}_{{}_3}}$. The lack of importance of domain wall formation in the present scenario from the spontaneous breaking of the discrete symmetry ${\mathbb{Z}}_2^{\prime \prime }$, provided $u\le 10$ MeV, is pointed out. We find that our proposed two component dark matter model is able to explain successfully both the above mentioned phenomena $-$ the Fermi-LAT observed $\gamma$-ray excess (from the ${\chi }_{{}_{{}_2}}\to \mathrm{b}\bar{\mathrm{b}}$ decay mode) and the observation of the X-ray line (from the decay channel ${\chi }_{{}_{{}_3}}\to \gamma \gamma$) by the XMM-Newton observatory.

arXiv comment11 eps Figures, 2 Tables, 32 Pages. Minor addition in Abstract. Inclusion in Section 1 of discussion of earlier attempts to explain the concerned phenomena by astrophysical processes. Extension of discussion in Section 6 to the case of a steeper dark matter density profile. Results unchanged. Version accepted for publication in JHEP

References in corpus (80)

• A Universal Density Profile from Hierarchical Clustering
• Planck 2013 results. XVI. Cosmological parameters
• Particle Dark Matter: Evidence, Candidates and Constraints
• First results from the LUX dark matter experiment at the Sanford Underground Research Facility
• Dark Matter Results from 225 Live Days of XENON100 Data
• Improved Naturalness with a Heavy Higgs: An Alternative Road to LHC Physics
• Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope
• Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters
• Neutralino Relic Density including Coannihilations
• An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster
• On The Origin Of The Gamma Rays From The Galactic Center
• Detection of a Gamma-Ray Source in the Galactic Center Consistent with Extended Emission from Dark Matter Annihilation and Concentrated Astrophysical Emission
• Astrophysical and Dark Matter Interpretations of Extended Gamma-Ray Emission from the Galactic Center
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Vacuum Stability Conditions From Copositivity Criteria
• Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S
• Simplified Dark Matter Models for the Galactic Center Gamma-Ray Excess
• A Renormalizable Model for the Galactic Center Gamma Ray Excess from Dark Matter Annihilation
• Possible Evidence For Dark Matter Annihilation In The Inner Milky Way From The Fermi Gamma Ray Space Telescope
• A comment on the emission from the Galactic Center as seen by the Fermi telescope
• Discovery of a 3.5 keV line in the Galactic Center and a Critical Look at the Origin of the Line Across Astronomical Targets
• Constraints on 3.55 keV line emission from stacked observations of dwarf spheroidal galaxies
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Dark Nuclei I: Cosmology and Indirect Detection
• WIMPs at the Galactic Center
• Fitting the Galactic Center Gamma-Ray Excess with Cascade Annihilations
• Galactic Center gamma-ray "excess" from an active past of the Galactic Centre?
• Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
• Flavored Dark Matter and the Galactic Center Gamma-Ray Excess
• Non-Detection of X-Ray Emission From Sterile Neutrinos in Stacked Galaxy Spectra
• Higgs portal vector dark matter for $\mathrm{GeV}$ scale $\gamma$-ray excess from galactic center
• Not so Coy Dark Matter explains DAMA (and the Galactic Center excess)
• Search for the ${\Lambda }_b\to \Lambda {\eta }^{\prime }$ and ${\Lambda }_b\to \Lambda \eta$ decays with the LHCb detector
• The Effective Hooperon
• On the connection of Gamma-rays, Dark Matter and Higgs searches at LHC
• A weighty interpretation of the Galactic Centre excess
• A 3.55 keV Photon Line and its Morphology from a 3.55 keV ALP Line
• Two-Component Dark Matter
• The Galactic Center Excess from the Bottom Up
• Multicomponent Dark Matter in Supersymmetric Hidden Sector Extensions
• Fermionic dark matter with pseudo-scalar Yukawa interaction
• Where do the 3.5 keV photons come from? A morphological study of the Galactic Center and of Perseus
• X-ray line signal from 7 keV axino dark matter decay
• Low-mass right-handed sneutrino dark matter: SuperCDMS and LUX constraints and the Galactic Centre gamma-ray excess
• A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
• X-ray line signal from decaying axino warm dark matter
• Direct and Indirect Singlet Scalar Dark Matter Detection in the Lepton-Specific two-Higgs-doublet Model
• Generating X-ray lines from annihilating dark matter
• X-ray Lines from Dark Matter: The Good, The Bad, and The Unlikely
• Two Component Dark Matter : A Possible Explanation of 130 GeV γ-Ray Line from the Galactic Centre
• X-ray lines from R-parity violating decays of keV sparticles
• Class of Higgs-portal Dark Matter models in the light of gamma-ray excess from Galactic center
• 7 keV Scalar Dark Matter and the Anomalous Galactic X-ray Spectrum
• The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter
• Anomaly-free flavor models for Nambu-Goldstone bosons and the 3.5 keV X-ray line signal
• 3.5 keV x-ray line from decaying gravitino dark matter
• Fits to the Fermi-LAT GeV excess with RH sneutrino dark matter: implications for direct and indirect dark matter searches and the LHC
• Axino dark matter in light of an anomalous X-ray line
• keV Photon Emission from Light Nonthermal Dark Matter
• 3.5 keV X-ray Line Signal from Decay of Right-Handed Neutrino due to Transition Magnetic Moment
• Multipartite Dark Matter
• Comment on "Dark matter searches going bananas: the contribution of Potassium (and Chlorine) to the 3.5 keV line"
• Galactic Center gamma-ray excess from two-Higgs-doublet-portal dark matter
• The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale
• Confronting the Galactic Center Gamma Ray Excess With a Light Scalar Dark Matter
• Nonabelian dark matter models for 3.5 keV X-rays
• Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
• Decaying Vector Dark Matter as an Explanation for the 3.5 keV Line from Galaxy Clusters
• 7 keV Sterile neutrino dark matter in $U(1{)}_R-$ lepton number model
• 7 keV Dark Matter as X-ray Line Signal in Radiative Neutrino Model
• 3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays
• The 3.5 keV X-ray line signature from annihilating and decaying dark matter in Weinberg model
• Effective field theory and keV lines from dark matter
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• 3.5 keV X-ray line and R-Parity Conserving Supersymmetry
• ${\nu }_R$ dark matter-philic Higgs for 3.5 keV X-ray signal
• Two Emission Mechanisms in the Fermi Bubbles: A Possible Signal of Annihilating Dark Matter
• Warm Dark Matter in Two Higgs Doublet Models
• Two component dark matter with multi-Higgs portals
• Low Energy Gamma Ray Excess Confronting a Singlet Scalar Extended Inert Doublet Dark Matter Model

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• When Freeze-out Precedes Freeze-in: Sub-TeV Fermion Triplet Dark Matter with Radiative Neutrino Mass
• Non-thermal production of lepton asymmetry and dark matter in minimal seesaw with right handed neutrino induced Higgs potential
• Common Origin of $3.55$ keV X-ray line and Gauge Coupling Unification with Left-Right Dark Matter
• Interpreting the galactic center gamma-ray excess in the NMSSM
• X-ray lines and self-interacting dark matter
• Explaining Low Energy $\gamma$-ray Excess from the Galactic Centre using a Two Component Dark Matter Model
• The Galactic Center Excess from Z3 Scalar Semi-Annihilations
• Anomalous X-Ray Galactic signal from 7 keV spin-$3/2$ dark matter decay
• Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter
• Addressing $\gamma$-ray emissions from dark matter annihilations in 45 milky way satellite galaxies and in extragalactic sources with particle dark matter models
• Non-adiabatic evolution of dark sector in the presence of $U(1{)}_{L_{\mu }-L_{\tau }}$ gauge symmetry
• Relativistic Freeze-in with Scalar Dark Matter in a Gauged $B-L$ Model and Electroweak Symmetry Breaking
• $U(1)$-charged Dark Matter in three-Higgs-doublet models
• Secluded Dark Matter in Gauged $B-L$ Model
• Reviewing the prospect of fermion triplets as dark matter and source of baryon asymmetry in non-standard cosmology
• Dwarf Galaxy $\gamma$-excess and 3.55 keV X-ray Line In A Nonthermal Dark Matter Model
• Scale-Invariant Two Component Dark Matter
• Signatures of Synchrotron Radiation from the Annihilation of Dark Matter at the Galactic Centre
• Neutrino mass and the Higgs portal dark matter in the ESSFSM
• Dark Matter Self Interactions and its Impact on Large Scale Structures