Search Publications
Neutrino emission from an off-axis jet driven by the tidal disruption event AT2019dsg
Liu, Ruo-Yu; Wang, Xiang-Yu; Xi, Shao-Qiang
Recently, a high-energy muon neutrino event was detected in association with a tidal disruption event (TDE) AT2019dsg at the time about 150 days after the peak of the optical/UV luminosity. We propose that such an association could be interpreted as arising from hadronic interactions between relativistic protons accelerated in the jet launched fro…
Effective J -factors for Milky Way dwarf spheroidal galaxies with velocity-dependent annihilation
Pace, Andrew B.; Kumar, Jason; Runburg, Jack +2 more
We calculate the effective J -factors, which determine the strength of indirect detection signals from dark matter annihilation, for 25 dwarf spheroidal galaxies (dSphs). We consider several well-motivated assumptions for the relative velocity dependence of the dark matter annihilation cross section: σAv : s -wave (velocity independent)…
Power of halometry
Van Tilburg, Ken; Weiner, Neal; Mishra-Sharma, Siddharth
Astrometric weak gravitational lensing is a powerful probe of the distribution of matter on sub-Galactic scales, which harbor important information about the fundamental nature of dark matter. We propose a novel method that utilizes angular power spectra to search for the correlated pattern of apparent motions of celestial objects induced from tim…
Diffusion in unimodular gravity: Analytical solutions, late-time acceleration, and cosmological constraints
Corral, Cristóbal; Cruz, Norman; González, Esteban
Unimodular gravity is an appealing approach to address the cosmological constant problem. In this scenario, the vacuum energy density of quantum fields does not gravitate and the cosmological constant appears merely as an integration constant. Recently, it has been shown that energy diffusion that may arise in quantum gravity and in theories with …
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…