Hidden-sector dark matter achieves standard thermal relic abundance via early decoupling with temperature-matched freeze-out, enabling WIMP-like cross sections without late-time thermalization.
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Joint prompt and inverse-Compton modeling of MSP-injected e± yields strong upper limits on η_e/η_γ from recent Fermi-LAT GCE spectra that exceed MAGIC globular-cluster bounds.
An optimized Fermi-LAT analysis finds the Galactic Center Excess follows an approximately spherical generalized NFW morphology with inner slope ~1.15, a spectrum peaking at a few GeV, and only upper limits above tens of GeV.
WIMP models for the Galactic Center Excess survive only in finely tuned resonant funnels with portal couplings around 10^-4, with leptophilic vectors and pseudoscalar portals remaining most viable after current bounds.
Updated constraints on two simplified dark matter models for the Galactic Center Excess leave unconstrained parameter space after applying recent multi-experiment data.
A parameter space analysis of a leptophilic scalar mediator model for Majorana dark matter yields a viable sub-GeV region after applying relic density, cosmological, astrophysical, and laboratory constraints.
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Strong Constraints on Millisecond Pulsar Injection Spectra from Fermi-LAT Observations of the Galactic Center
Joint prompt and inverse-Compton modeling of MSP-injected e± yields strong upper limits on η_e/η_γ from recent Fermi-LAT GCE spectra that exceed MAGIC globular-cluster bounds.
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A Precise Measurement of the Fermi-LAT Galactic Center Excess Morphology and Spectrum
An optimized Fermi-LAT analysis finds the Galactic Center Excess follows an approximately spherical generalized NFW morphology with inner slope ~1.15, a spectrum peaking at a few GeV, and only upper limits above tens of GeV.