Publications (29)
Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
Anupam Ray, Ranjan Laha, Julian B. Muñoz +1
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultra-light, asteroid-…
Long-lived Axion-Like Particles from Tau Decays
Yohei Ema, Patrick J. Fox, Matheus Hostert +4
Axion-like particles (ALPs) are well-motivated examples of light, weakly coupled particles in theories beyond the Standard Model. In this work, we study long-lived ALPs coupled exc…
Low Mass Black Holes from Dark Core Collapse
Basudeb Dasgupta, Ranjan Laha, Anupam Ray
Unusual masses of black holes being discovered by gravitational wave experiments pose fundamental questions about the origin of these black holes. Black holes with masses smaller t…
Neutrinos from Earth-Bound Dark Matter Annihilation
Maxim Pospelov, Anupam Ray
A sub-component of dark matter with a short collision length compared to a planetary size leads to efficient accumulation of dark matter in astrophysical bodies. We analyze possibl…
Is the Turner Window Open? Seeking Closure with Resonant Absorption of Galactic Axions in NaI Dark Matter Detectors
W. C. Haxton, Xing Liu, Anupam Ray +1
Motivated by the DAMA/LIBRA annual modulation signal, the dark matter community has invested heavily in ultra-clean underground NaI detectors to search for light WIMPs. We point ou…
Can LIGO Detect Non-Annihilating Dark Matter?
Sulagna Bhattacharya, Basudeb Dasgupta, Ranjan Laha +1
Dark matter from the galactic halo can accumulate in neutron stars and transmute them into sub-2.5 black holes if the dark matter particles are heavy, stable, and have…
Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter
Basudeb Dasgupta, Ranjan Laha, Anupam Ray
Primordial black holes can have substantial spin -- a fundamental property that has a strong effect on its evaporation rate. We conduct a comprehensive study of the detectability o…
Probing Ultra-light Primordial Black Holes as a Dark Matter Candidate
Anupam Ray
Dark Matter (DM) is omnipresent in our universe. Despite its abundance, the microscopic identity of DM still remains a mystery. Primordial black holes (PBHs), possibly formed via g…
Beyond Hawking evaporation of black holes formed by dark matter in compact stars
Ujjwal Basumatary, Nirmal Raj, Anupam Ray
The memory burden effect is an explicit resolution to the information paradox by which an evaporating black hole acquires quantum hair, which then suppresses its rate of mass loss…
Dark matter capture in celestial objects: light mediators, self-interactions, and complementarity with direct detection
Basudeb Dasgupta, Aritra Gupta, Anupam Ray
We generalize the formalism for DM capture in celestial bodies to account for arbitrary mediator mass, and update the existing and projected astrophysical constraints on DM-nucleon…
Continuous Gravitational Waves: A New Window to Look for Heavy Non-annihilating Dark Matter
Sulagna Bhattacharya, Andrew L. Miller, Anupam Ray
Sun-like stars can transmute into comparable mass black holes by steadily accumulating heavy non-annihilating dark matter particles over the course of their lives. If such stars fo…
New Windows on Heavy Dark Matter: Mineral Melt Modelling and X-Ray Readout for Muscovite Mica
Yilda Boukhtouchen, Joseph Bramante, Andrew Buchanan +5
Muscovite mica is a translucent, layered silicate mineral whose basal cleavage, low radiogenic background, gigayear exposures, and demonstrated track retention over geological time…
Stronger Constraints on Primordial Black Holes as Dark Matter Derived from the Thermal Evolution of the Intergalactic Medium over the Last Twelve Billion Years
Nabendu Kumar Khan, Anupam Ray, Girish Kulkarni +1
Primordial black holes (PBHs) have been explored as potential dark matter candidates, with various astrophysical observations placing upper limits on the fraction …
Dark Matter Catalyzed Baryon Destruction
Yohei Ema, Robert McGehee, Maxim Pospelov +1
WIMP-type dark matter may have additional interactions that break baryon number, leading to induced nucleon decays which are subject to direct experimental constraints from proton…
Probing Earth-Bound Dark Matter with Nuclear Reactors
Yohei Ema, Maxim Pospelov, Anupam Ray
Strongly-interacting dark matter can be accumulated in large quantities inside the Earth, and for dark matter particles in a few GeV mass range, it can exist in large quantities ne…
Celestial Objects as Strongly-Interacting Non-Annihilating Dark Matter Detectors
Anupam Ray
Non-annihilating dark matter particles, owing to their interactions with ordinary baryonic matter, can efficiently accumulate inside celestial objects. For heavy mass, they gravita…
Evolution of Tau-Neutrino Lepton Number in Protoneutron Stars due to Active-Sterile Neutrino Mixing
Anupam Ray, Yong-Zhong Qian
We present an approximate treatment of the mixing between () and a sterile species () with a vacuum mass-squared difference of 10-10$…
New physics in multi-lepton tau decays
Yohei Ema, Patrick J. Fox, Matheus Hostert +4
Dark particles with lepton-flavor-violating couplings to the tau lepton can induce rare neutrinoless decays with large final state multiplicities. We study models where transi…
A Continuous Galactic Line Source of Axions: The Remarkable Case of 23Na
W. C. Haxton, Xing Liu, Annie McCutcheon +1
We argue that Na is a potentially significant source of galactic axions. For temperatures K -- characteristic of carbon burning in the massive progeni…
Detecting Dark Matter with Neutron Stars
Anupam Ray
Neutron stars offer powerful astrophysical laboratories to probe the properties of dark matter. Gradual accumulation of heavy, non-annihilating dark matter in neutron stars can lea…
Mergers as a Probe of Particle Dark Matter
Anupam Ray
Black holes below Chandrasekhar mass limit (1.4 ) can not be produced via any standard stellar evolution. Recently, gravitational wave experiments have also discovered u…
Constraining primordial black holes as dark matter using the global 21-cm signal with X-ray heating and excess radio background
Shikhar Mittal, Anupam Ray, Girish Kulkarni +1
Using the global 21-cm signal measurement by the EDGES collaboration, we derive constraints on the fraction of the dark matter that is in the form of primordial black holes (PBHs)…
Enhanced Muonization by Active-Sterile Neutrino Mixing in Protoneutron Stars
Anupam Ray, Yong-Zhong Qian
We study - and - mixing in the protoneutron star (PNS) created in a core-collapse supernova (CCSN). We point out the importance of the feedback on…
Dark matter capture in celestial objects: Improved treatment of multiple scattering and updated constraints from white dwarfs
Basudeb Dasgupta, Aritra Gupta, Anupam Ray
We revisit dark matter (DM) capture in celestial objects, including the impact of multiple scattering, and obtain updated constraints on the DM-proton cross section using observati…
Revisiting Turner Window Axions: The Untapped Potential of NaI Dark Matter Detectors
W. C. Haxton, Xing Liu, Anupam Ray +1
The "Turner window" corresponds to axions with masses 1 eV that have sufficiently strong couplings to matter to evade limits from the cooling of SN1987A. This window, thr…
Axion lines from nuclear de-excitations in galactic stellar populations
Orion Ning, Anupam Ray, Benjamin R. Safdi
We show that mono-energetic axions are produced in abundance through nuclear de-excitations in nearby galaxies such as M87, which is the central galaxy of the Virgo cluster, and th…
Galactic Positron Excess from Selectively Enhanced Dark Matter Annihilation
Anirban Das, Basudeb Dasgupta, Anupam Ray
Precision measurements of the positron flux in cosmic ray have revealed an unexplained bump in the spectrum around , not clearly attributable to known as…
Dark Matter Annihilation inside Large Volume Neutrino Detectors
David McKeen, David E. Morrissey, Maxim Pospelov +2
New particles in theories beyond the standard model can manifest as stable relics that interact strongly with visible matter and make up a small fraction of the total dark matter a…
Probing self-interacting sterile neutrino dark matter with the diffuse supernova neutrino background
A. Baha Balantekin, George M. Fuller, Anupam Ray +1
The neutrinos in the diffuse supernova neutrino background (DSNB) travel over cosmological distances and this provides them with an excellent opportunity to interact with dark reli…