Search Publications
Search for primordial black hole dark matter with x-ray spectroscopic and imaging satellite experiments and prospects for future satellite missions
Santangelo, Andrea; Malyshev, Denys; Moulin, Emmanuel
Ultralight primordial black holes (PBHs) in the mass range of 1016- 1022 g are allowed by current observations to constitute a significant fraction, if not all, of the dark matter in the Universe. In this work, we present limits on ultralight, nonrotating PBHs which arise from the nondetection of the Hawking radiation signals…
Improved white dwarves constraints on inelastic dark matter and left-right symmetric models
Biswas, Anirban; Kar, Arpan; Kim, Hyomin +2 more
Weakly interacting massive particles (WIMPs) can be captured in compact stars such as white dwarves (WDs) if they are in a dark matter (DM)-rich environment, leading to an increase in the star luminosity through their annihilation process. N -body simulations suggest that the core of the Messier 4 globular cluster (where plenty of WDs are observed…
Uncovering a hidden black hole binary from secular eccentricity variations of a tertiary star
Liu, Bin; D'Orazio, Daniel J.; Vigna-Gómez, Alejandro +1 more
We study the dynamics of a solar-type star orbiting around a black hole binary (BHB) in a nearly coplanar system. We present a novel effect that can prompt a growth and significant oscillations of the eccentricity of the stellar orbit when the system encounters an "apsidal precession resonance," where the apsidal precession rate of the outer stell…
Probing dark gauge boson with observations from neutron stars
Lu, Bo-Qiang; Chiang, Cheng-Wei
We present an investigation on the production of light dark gauge bosons by the nucleon bremsstrahlung processes in the core of neutron stars. The dark vector is assumed to be a U (1 )B-L gauge boson with a mass much below keV. We calculate the emission rate of the dark vector produced by the nucleon bremsstrahlung in the degenerate nuc…
Figures of merit for a stochastic gravitational-wave background measurement by LISA: Implications of LISA Pathfinder noise correlations
Christensen, Nelson; Meyer, Renate; Boileau, Guillaume
An important goal of the Laser Interferometer Space Antenna (LISA) is to observe a stochastic gravitational-wave background (SGWB). A study of possible correlated noise in LISA is relevant to establish limits for this future measurement. To test noise investigation methods under somewhat realistic conditions, we use the data of LISA Pathfinder. We…
Radiation from cold molecular clouds and Sun chromosphere produced by antiquark nugget dark matter
Flambaum, V. V.; Samsonov, I. B.
We study the astrophysical implications of the quark nugget model of dark matter and propose observational techniques for detecting antiquark nuggets (anti-QNs) with modern telescopes. Anti-QNs are compact composite objects of antiquark matter with a typical radius R ∼10-5 cm and density exceeding that of nuclear matter. Atoms and molec…
Presupernova ultralight axionlike particles
Kotake, Kei; Takiwaki, Tomoya; Mori, Kanji
We calculate the production of ultralight axionlike particles (ALPs) in a nearby supernova progenitor. Once produced, ALPs escape from the star and a part of them is converted into photons during propagation in the Galactic magnetic field. It is found that the MeV photon flux that reaches Earth may be detectable by γ -ray telescopes for ALPs light…