Search Publications
Dark matter substructures affect dark matter-electron scattering in xenon-based direct detection experiments
Laha, Ranjan; Maity, Tarak Nath
Recent sky surveys have discovered a large number of stellar substructures. It is highly likely that there are dark matter (DM) counterparts to these stellar substructures. We examine the implications of DM substructures for electron recoil (ER) direct detection (DD) rates in dual phase xenon experiments. We have utilized the results of the LAMOST…
Sensitivity to dark sector scales from gravitational wave signatures
Dent, James B.; Dutta, Bhaskar; Ghosh, Sumit +2 more
We consider gravitational sound wave signals produced by a first-order phase transition in a theory with a generic renormalizable thermal effective potential of power law form. We find the frequency and amplitude of the gravitational wave signal can be related in a straightforward manner to the parameters of the thermal effective potential. This l…
Phenomenology of CP-even ALP
Sakurai, Kodai; Yin, Wen
Axion or axion-like particle (ALP) has been usually considered as a CP-odd Nambu-Goldstone boson (NGB) from the spontaneous breakdown of a global U(1) symmetry. In this paper, we point out that the NGB behaves as a CP-even particle coupled to the SM particles in a large class of simple (or perhaps the simplest) renormalizable models. We provide a …
Crosspolar performance of an elliptical corrugated-horn antenna
Silk, Joseph; Wu, Yi-Peng; Pinetti, Elena +1 more
The ultra-slow-roll (USR) inflation represents a class of single-field models with sharp deceleration of the rolling dynamics on small scales, leading to a significantly enhanced power spectrum of the curvature perturbations and primordial black hole (PBH) formation. Such a sharp transition of the inflationary background can trigger the coherent m…
How to search for mirror stars with Gaia
Matzner, Christopher D.; Curtin, David; Howe, Aaron +1 more
We show for the first time how to conduct a direct search for dark matter using Gaia observations. Its public astrometric data may contain the signals of mirror stars, exotic compact objects made of atomic dark matter with a tiny kinetic mixing between the dark and SM photon. Mirror stars capture small amounts of interstellar material in their cor…
Confronting SO(10) GUTs with proton decay and gravitational waves
King, Stephen F.; Pascoli, Silvia; Zhou, Ye-Ling +1 more
Grand Unified Theories (GUT) predict proton decay as well as the formation of cosmic strings which can generate gravitational waves. We determine which non-supersymmetric SO(10) breaking chains provide gauge unification in addition to a gravitational signal from cosmic strings. We calculate the GUT and intermediate scales for these SO(10) breaking…
Testing dark matter with Cherenkov light — prospects of H.E.S.S. and CTA for exploring minimal supersymmetry
Moulin, Emmanuel; Hryczuk, Andrzej; Jodłowski, Krzysztof +4 more
We provide an updated and improved study of the prospects of the H.E.S.S. and Cherenkov Telescope Array (CTA) experiments in testing neutralino dark matter in the Minimal Supersymmetric Standard Model with nine free parameters (p9MSSM). We include all relevant experimental constraints and theoretical developments, in particular a calculation of th…
Neutrino lines from majoron dark matter
Garcia-Cely, Camilo; Heeck, Julian
Models with spontaneously broken global lepton number can lead to a pseudo-Goldstone boson as a long-lived dark matter candidate. Here we revisit the case of singlet majoron dark matter and discuss multiple constraints. For masses above MeV, this model could lead to a detectable flux of monochromatic mass-eigenstate neutrinos, which have flavor ra…
CMB constraints on the inflaton couplings and reheating temperature in α-attractor inflation
Drewes, Marco; Kang, Jin U.; Mun, Ui Ri
We study reheating in α-attractor models of inflation in which the inflaton couples to other scalars or fermions. We show that the parameter space contains viable regions in which the inflaton couplings to radiation can be determined from the properties of CMB temperature fluctuations, in particular the spectral index. This may be the only way to …
Pico-charged intermediate particles rescue dark matter interpretation of 511 keV signal
Farzan, Y.; Rajaee, M.
Various alleged indirect dark matter search signals, such as the 511 keV line from galaxy center or the PAMELA/AMS02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or by the absence of an impact on CMB through delayed recombination. We propose a novel scenario that can avoid these bounds based on the de…