WIMPless dark matter and the excess gamma rays from the Galactic center

Guohuai Zhu

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WIMPless dark matter and the excess gamma rays from the Galactic center

Guohuai Zhu

High Energy Physics - Phenomenology · Submitted 23 Jan 2011

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim It is found that, for scalar or vector WIMPless dark matter, neither the WMAP haze nor the CoGeNT and DAMA observations could be explained simultaneously with the excess gamma rays from the Galactic center.

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What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.84 · human participants 0.01 · controlled comparison 0.04 · randomized assignment 0.01 · states quantitative result 0.10 · compares with prior results 0.29 · mentions code or data availability 0.01.

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In this paper we discuss the excess gamma rays from the Galactic center, the WMAP haze and the CoGeNT and DAMA results in WIMPless models. At the same time we also investigate the low energy constraints from the anomalous magnetic moment of leptons and from some lepton flavor violating decays. It is found that, for scalar or vector WIMPless dark matter, neither the WMAP haze nor the CoGeNT and DAMA observations could be explained simultaneously with the excess gamma rays from the Galactic center. As to fermion WIMPless dark matter, it is only marginally possible to accommodate the CoGeNT and DAMA results with the excess gamma rays from the Galactic center with vector connector fields. On the other hand, only scalar connector fields could interpret the WMAP haze concerning the constraints of anomalous magnetic moment of leptons. Furthermore, if there is only one connector field for all the charged leptons, some lepton flavor violating decays could happen with too large branching ratios severely violating the experimental bounds.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	In this paper we discuss the excess gamma rays from the Galactic center, the WMAP haze and the CoGeNT and DAMA results in WIMPless models.	contribution 0.95	0.33	0.04	unclear 0.64
s1	At the same time we also investigate the low energy constraints from the anomalous magnetic moment of leptons and from some lepton flavor violating decays.	contribution 0.97	0.85	0.02	asserted 0.87
s2	It is found that, for scalar or vector WIMPless dark matter, neither the WMAP haze nor the CoGeNT and DAMA observations could be explained simultaneously with the excess gamma rays from the Galactic center.	result 1.00	0.92	0.61	asserted 0.90
s3	As to fermion WIMPless dark matter, it is only marginally possible to accommodate the CoGeNT and DAMA results with the excess gamma rays from the Galactic center with vector connector fields.	result 1.00	0.86	0.14	hedged possibility 0.98
s4	On the other hand, only scalar connector fields could interpret the WMAP haze concerning the constraints of anomalous magnetic moment of leptons.	result 0.99	0.82	0.09	asserted 0.60
s5	Furthermore, if there is only one connector field for all the charged leptons, some lepton flavor violating decays could happen with too large branching ratios severely violating the experimental bounds.	result 0.97	0.72	0.06	hedged possibility 0.96

What kind of paper the classifier reports this is: theoretical result 0.99 · evidence from analysis of existing data 0.70.

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The paper

Original abstract

In this paper we discuss the excess gamma rays from the Galactic center, the WMAP haze and the CoGeNT and DAMA results in WIMPless models. At the same time we also investigate the low energy constraints from the anomalous magnetic moment of leptons and from some lepton flavor violating decays. It is found that, for scalar or vector WIMPless dark matter, neither the WMAP haze nor the CoGeNT and DAMA observations could be explained simultaneously with the excess gamma rays from the Galactic center. As to fermion WIMPless dark matter, it is only marginally possible to accommodate the CoGeNT and DAMA results with the excess gamma rays from the Galactic center with vector connector fields. On the other hand, only scalar connector fields could interpret the WMAP haze concerning the constraints of anomalous magnetic moment of leptons. Furthermore, if there is only one connector field for all the charged leptons, some lepton flavor violating decays could happen with too large branching ratios severely violating the experimental bounds.

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References

Forward citations

Cited by 12 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars
astro-ph.HE 2014-07 conditional novelty 6.0 of 10

Millisecond pulsars can produce at most about 1 to 5 percent of the Galactic Center gamma-ray excess, based on low-mass X-ray binary counts and the local pulsar luminosity function.
A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model
hep-ph 2015-02 conditional novelty 5.0 of 10

Three pMSSM neutralino scenarios, at 84-97 GeV annihilating to W bosons and 174-187 GeV annihilating to top quarks, fit the Fermi Galactic Center GeV excess once a 10% theory uncertainty is allowed.
A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
hep-ph 2014-11 conditional novelty 5.0 of 10

Once correlated foreground and background uncertainties are propagated into the fit, a much wider set of dark matter annihilation channels and masses reproduces the Fermi Galactic center excess, and dwarf-galaxy limit...
WIMPs at the Galactic Center
hep-ph 2014-11 conditional novelty 5.0 of 10

Once background-model systematics are folded in, dark matter of roughly 80 to 310 GeV annihilating to W, Z, Higgs or top pairs fits the Galactic center gamma-ray excess, widening the viable mass window well beyond ear...
Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
hep-ph 2014-04 conditional novelty 5.0 of 10

Dark matter annihilating into on-shell mediators, rather than directly into bottom quarks, can reproduce the Galactic Center gamma-ray excess with an 80 or 120 GeV dark matter particle whose Standard Model coupling is...

Show 7 more citing papers

Millisecond pulsar interpretation of the Galactic center gamma-ray excess
astro-ph.HE 2014-04 conditional novelty 5.0 of 10

A bulge population of roughly 13,000 millisecond pulsars, with a luminosity function calibrated on Fermi-LAT disk pulsars, can reproduce the Galactic center gamma-ray excess while staying below the point-source detect...
Flavored Dark Matter and the Galactic Center Gamma-Ray Excess
hep-ph 2014-04 conditional novelty 5.0 of 10

A bottom-flavored dark matter model with a colored scalar mediator fits the Galactic Center gamma-ray excess and predicts a direct-detection cross section within reach of LUX.
The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
astro-ph.HE 2014-02 conditional novelty 5.0 of 10

A sharper re-analysis of Fermi data confirms a round, centrally peaked GeV gamma-ray excess around the Galactic Center whose spectrum and radial profile are consistent with a 36 to 51 GeV dark matter particle annihila...
Extended gamma-ray emission from Coy Dark Matter
hep-ph 2014-01 conditional novelty 5.0 of 10

Dirac dark matter of about 30 GeV annihilating to b quarks via a light pseudoscalar fits the galactic center gamma-ray excess and, in much of its parameter space, produces no observable signal in any other dark matter search.
Isospin-Violating Dark Matter
hep-ph 2011-02 conditional novelty 5.0 of 10

With a neutron-to-proton coupling ratio near -0.7 and realistic isotope distributions, the DAMA and CoGeNT signals become consistent with XENON bounds and predict signals at CRESST and future XENON.
Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
hep-ph 2014-05 conditional novelty 4.0 of 10

Hidden-sector dark matter that annihilates into intermediate particles decaying to b-quarks can fit the Galactic Center gamma-ray excess and evade direct detection, in both a dark photon model and a generalized NMSSM ...
Low-mass right-handed sneutrino dark matter: SuperCDMS and LUX constraints and the Galactic Centre gamma-ray excess
hep-ph 2014-04 conditional novelty 4.0 of 10

Light right-handed sneutrinos in the NMSSM can satisfy current Higgs, flavour, direct-detection, and indirect-detection constraints for masses from about 2 to 50 GeV, with a wide surviving region for future low-thresh...

How the literature uses it

17 arXiv papers cite this in 19 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 8 sentences without a confident label

Cites it as background 11 papers

There have been already a large number of attempts to explain the excess in a plethora of particle physics theories/models [ref] , including supersymmetric (SUSY) [ref] scenarios [ref] .

A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model · Introduction · 0.95
A variety of interesting signatures of WIMPless dark matter have been studied in the case where the candidate is a scalar [ref] , with a particular focus on the limit of low mass and large spin-independent scattering cross-section ($$), i.e., the region of parameter-space nominally preferred by the data from the DAMA, CoGeNT and CRESST experiments [ref] .

Detection Prospects for Majorana Fermion WIMPless Dark Matter · Introduction · 0.80
As for the DM interpretation, there is by now an extensive array of DM scenarios that both can explain the observed emission by DM annihilation while simultaneously being compatible with other direct, indirect and collider constraints [ref] .

A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics · Introduction · 0.90

What it cites · 33 sentences without a confident label

Contests 1 paper

For the scalar case, it is found to be [our expression is different from that derived in [ref] , which is probably due to that the author of [ref] did not notice that the hermitian conjugate of $Y̅^f(1-γ_5)f$ should be $f̅(1+γ_5)Y^f$.] [equation] while for the vector case, it is [equation]

Contributions to the Muon's Anomalous Magnetic Moment from a Hidden Sector · The scalar and vector WIMPless DM · contest 0.83

Uses data or values from 8 papers

Then [equation] It is shown in [ref] that the excess gamma rays from the GC can be explained by the DM annihilation primarily into tau lepton pairs, with the annihilation cross section $⟨σv ⟩$ in the range of $3.3 ×10^-27 ^3/$s to $1.5 ×10^-26^3/$s.

Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope · The scalar and vector WIMPless DM · 0.88
The CoGeNT and DAMA/LIBRA results, if interpreted as DM elastic scattering, require $σ_SI^p,n∼(1-2) ×10^-40 ^2$ [ref] [Notice that this range of cross section is obtained by assuming that the CoGENT excess is actually significant of a real signal.

Global interpretation of direct Dark Matter searches after CDMS-II results · The scalar and vector WIMPless DM · 0.91
The CoGeNT and DAMA/LIBRA results, if interpreted as DM elastic scattering, require $σ_SI^p,n∼(1-2) ×10^-40 ^2$ [ref] [Notice that this range of cross section is obtained by assuming that the CoGENT excess is actually significant of a real signal.

Implications of CoGeNT and DAMA for Light WIMP Dark Matter · The scalar and vector WIMPless DM · 0.91

Cites as support 5 papers

Nevertheless, concerning the uncertainties of the DM velocity distribution [ref] and of the relative scintillation efficiency of the liquid xenon at low recoil energy [ref] , it is still possible to interpret the CoGeNT and DAMA/LIBRA observations as light DM with mass around $7$ GeV [ref] , and at the same time, consistent with the null results of Xenon100 and CDMS-II.

XENON10/100 dark matter constraints in comparison with CoGeNT and DAMA: examining the Leff dependence · Introduction · 0.98
Nevertheless, concerning the uncertainties of the DM velocity distribution [ref] and of the relative scintillation efficiency of the liquid xenon at low recoil energy [ref] , it is still possible to interpret the CoGeNT and DAMA/LIBRA observations as light DM with mass around $7$ GeV [ref] , and at the same time, consistent with the null results of Xenon100 and CDMS-II.

Comments on arXiv:1006.0972 "XENON10/100 dark matter constraints in comparison with CoGeNT and DAMA: examining the Leff dependence" · Introduction · 0.98
Nevertheless, concerning the uncertainties of the DM velocity distribution [ref] and of the relative scintillation efficiency of the liquid xenon at low recoil energy [ref] , it is still possible to interpret the CoGeNT and DAMA/LIBRA observations as light DM with mass around $7$ GeV [ref] , and at the same time, consistent with the null results of Xenon100 and CDMS-II.

A Consistent Dark Matter Interpretation For CoGeNT and DAMA/LIBRA · Introduction · 0.98

Cites as background 7 papers

Recently Hooper and Goodenough [ref] investigated the gamma rays from the GC using the first two years of data from the Fermi Gamma Ray Space Telescope.

Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope · Introduction · 0.88
There are also anomalous microwave emission from the inner Galaxy in the WMAP data [ref] which is known as the "WMAP haze".

Microwave ISM Emission Observed by WMAP · Introduction · 0.93
There are also anomalous microwave emission from the inner Galaxy in the WMAP data [ref] which is known as the "WMAP haze".

Extended Anomalous Foreground Emission in the WMAP 3-Year Data · Introduction · 0.93

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