Search Publications
Implications of the Gaia sausage for dark matter nuclear interactions
Buch, Jatan; Leung, John Shing Chau; Fan, JiJi
The advent of the Gaia era has led to potentially revolutionary understanding of dark matter (DM) dynamics in our galaxy, which has important consequences for direct detection (DD) experiments. In this paper, we study how the empirical DM velocity distribution inferred from Gaia-sausage, a dominant substructure in the solar neighborhood, affects t…
Monte Carlo control loops for cosmic shear cosmology with DES Year 1 data
Smith, M.; Annis, J.; Bertin, E. +53 more
Weak lensing by large-scale structure is a powerful probe of cosmology and of the dark universe. This cosmic shear technique relies on the accurate measurement of the shapes and redshifts of background galaxies and requires precise control of systematic errors. Monte Carlo control loops (MCCL) is a forward modeling method designed to tackle this p…
Astrometric effects of gravitational wave backgrounds with nonluminal propagation speeds
Gilmore, Gerard; Mihaylov, Deyan P.; Moore, Christopher J. +2 more
A passing gravitational wave causes a deflection in the apparent astrometric positions of distant stars. The effect of the speed of the gravitational wave on this astrometric shift is discussed. A stochastic background of gravitational waves would result in a pattern of astrometric deflections which are correlated on large angular scales. These co…
Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars
Tam, P. H. T.; Zhu, W. S.; Long, G. B. +1 more
The first measurements from the CIBER experiment of extragalactic background light (EBL) in near-infrared (NIR) band exhibit a higher intensity than those inferred through γ -ray observations. Recent theoretical-EBL intensities are typically consistent with the very high energy (VHE) γ -ray observations. Yet, it is possible that the excess NIR rad…
Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars
Bhadra, Arunava; Majumdar, Debasish; Banik, Prabir +1 more
The recent detections of the neutrino event IceCube-170922A, 13 muon-neutrino events observed in 2014-2015 and the IceCube-141209A by IceCube observatory from the Blazars TXS 0506 +056 , PKS 0502 +049 /TXS 0506 +056 , and GB6 J1040+0617 respectively, all of which were in the state of enhanced gamma-ray emission, indicate that cosmic rays are accel…
Search for traversable wormholes in active galactic nuclei using x-ray data
Tripathi, Ashutosh; Zhou, Biao; Abdikamalov, Askar B. +2 more
In a previous paper, one of us calculated iron K α line profiles emitted from possible accretion disks around traversable wormholes as a first step to use x-ray reflection spectroscopy to search for astrophysical wormholes in active galactic nuclei. In the present paper, we extend that work and construct an XSPEC model for the whole relativistic r…
Fifth force induced by a chameleon field on nested cylinders
Bergé, Joel; Pernot-Borràs, Martin; Uzan, Jean-Philippe +1 more
This article investigates the properties of a scalar fifth force that arises in a scalar tensor-theory with a chameleon screening mechanism in the context of gravity space missions like the MICROSCOPE experiment. In such an experiment, the propagation of the chameleon field inside the nested cylinders of the experiment causes a fifth force when th…
Testing the Keplerian disk hypothesis using x-ray reflection spectroscopy
Tripathi, Ashutosh; Zhou, Biao; Abdikamalov, Askar B. +3 more
The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the electromagnetic spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly geodesic circular orbits on the equ…
Equilibrium axisymmetric halo model for the Milky Way and its implications for direct and indirect dark matter searches
Petač, Mihael
We for the first time provide self-consistent axisymmetric phase-space distribution models for the Milky Way's dark matter (DM) halo which are carefully matched against the latest kinematic measurements through Bayesian analysis. By using broad priors on the individual galactic components, we derive conservative estimates for the astrophysical fac…