Search Publications
Natural emergence of neutrino masses and dark matter from R-symmetry
Chakraborty, Sabyasachi; Chakrabortty, Joydeep
We propose a supersymmetric extension of the Standard Model (SM) with a continuous global U(1) R symmetry. The R-charges of the SM fields are identified with that of their lepton numbers. As a result, both bilinear and trilinear ` R-parity violating' (RPV) terms could be present at the superpotential. However, R-symmetry is not an exac…
Effective field theory of dark matter: a global analysis
Calore, Francesca; Bertone, Gianfranco; Trotta, Roberto +4 more
We present global fits of an effective field theory description of real, and complex scalar dark matter candidates. We simultaneously take into account all possible dimension 6 operators consisting of dark matter bilinears and gauge invariant combinations of quark and gluon fields. We derive constraints on the free model parameters for both the re…
Signals of a light dark force in the galactic center
Weiner, Neal; Liu, Jia; Xue, Wei
Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime ( m χ ≲ m Z /2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent…
The semi-constrained NMSSM satisfying bounds from the LHC, LUX and Planck
Ellwanger, Ulrich; Hugonie, Cyril
We study the parameter space of the semi-constrained NMSSM, compatible with constraints on the Standard Model like Higgs mass and signal rates, constraints from searches for squarks and gluinos, a dark matter relic density compatible with bounds from WMAP/Planck, and direct detection cross sections compatible with constraints from LUX. We consider…
Annihilation signals from asymmetric dark matter
Hardy, Edward; Lasenby, Robert; Unwin, James
In the simplest models of asymmetric dark matter (ADM) annihilation signals are not expected, since the DM is non-self-conjugate and the relic density of anti-DM is negligible. We investigate a new class of models in which a symmetric DM component, in the `low-mass' 1-10 GeV regime favoured for linking the DM and baryon asymmetries, is repopulated…
Statistical tests of sterile neutrinos using cosmology and short-baseline data
Bergström, Johannes; Gonzalez-Garcia, M. C.; Niro, V. +1 more
In this paper we revisit the question of the information which cosmology provides on the scenarios with sterile neutrinos invoked to describe the SBL anomalies using Bayesian statistical tests. We perform an analysis of the cosmological data in ΛCDM+ r + ν s cosmologies for different cosmological data combinations, and obtain the marg…
Constraining light dark matter with diffuse X-ray and gamma-ray observations
Essig, Rouven; Kuflik, Eric; Volansky, Tomer +2 more
We present constraints on decaying and annihilating dark matter (DM) in the 4 keV to 10 GeV mass range, using published results from the satellites HEAO-1, INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive analytic expressions for the gamma-ray spectra from various DM decay modes, and find lifetime constraints in the ran…
Light sterile neutrinos in cosmology and short-baseline oscillation experiments
Gariazzo, S.; Giunti, C.; Laveder, M.
We analyze the most recent cosmological data, including Planck, taking into account the possible existence of a sterile neutrino with a mass at the eV scale indicated by short-baseline neutrino oscillations data in the 3+1 framework. We show that the contribution of local measurements of the Hubble constant induces an increase of the value of the …
Dichromatic dark matter
Su, Meng; Zhao, Yue; Bai, Yang
Both the robust INTEGRAL 511 keV gamma-ray line and the recent tentative hint of the 135 GeV gamma-ray line from Fermi-LAT have similar signal morphologies, and may be produced from the same dark matter annihilation. Motivated by this observation, we construct a dark matter model to explain both signals and to accommodate the two required annihila…