Article
Physics, Multidisciplinary
Sulagna Bhattacharya, Basudeb Dasgupta, Ranjan Laha, Anupam Ray
Summary: This study shows that the nondetection of gravitational waves from low-mass black hole mergers can place constraints on the interactions between nonannihilating dark matter particles and nucleons. With LIGO data, benchmark constraints for different types of dark matter have been determined, which will help detect particle dark matter and test its ability to explain the absence of pulsars in the Galactic center.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Angana Chakraborty, Maria Dainotti, Olivia Cantrell, Nicole Lloyd-Ronning
Summary: We analyzed two distinct samples of gamma-ray bursts (GRBs), one with radio afterglow emission and one without. Using an updated sample of 211 GRBs, we found that the intrinsic gamma-ray duration (T-int) and isotropic equivalent energy (E-iso) distributions differ significantly between the two populations. We also observed a statistically significant anticorrelation between the jet opening angle and redshift, as well as between T-int and redshift, for both radio-bright and radio-dark GRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Cyril Creque-Sarbinowski, Jeffrey Hyde, Marc Kamionkowski
Summary: In this study, we investigate the coupling between cosmic strings and neutrinos, suggesting that cosmic strings may contribute to the high-energy astrophysical neutrino flux observed by IceCube. By calculating the neutrino spectrum emitted from cosmic string loops with quasicusps, quasikinks, or kink-kink collisions, we consider two models of neutrino emission: one where the string features directly emit neutrinos, and one where they emit a scalar particle that eventually decays into neutrinos. In either case, we find that the spectrum of cosmic string neutrinos can be described by a power law with a high-energy cutoff. Although none of the models fully match the observed high-energy neutrino spectrum, we find that the maximum contribution of cosmic string neutrinos can still be a significant fraction of the observed flux, causing a bump in the observed neutrino spectrum. Finally, we present the viable parameter space for neutrino emission in each of the models.
Article
Astronomy & Astrophysics
Andrea Caputo, Michela Negro, Marco Regis, Marco Taoso
Summary: We study the potential of the NASA MeV mission COSI (Compton Spectrometer and Imager) in the search for dark matter. Our results show that COSI offers a great opportunity to directly detect dark matter in the form of monochromatic gamma-rays from decays or annihilations. We also demonstrate that COSI can contribute to the search for primordial black holes (PBHs) dark matter and improve current bounds on sub-GeV dark matter annihilation/decay and PBH evaporation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
M. Muccino, L. Izzo, O. Luongo, K. Boshkayev, L. Amati, M. Della Valle, G. B. Pisani, E. Zaninoni
Summary: Observations of gamma-ray bursts up to z similar to 9 are best suited for studying the possible evolution of the universe equation of state at intermediate redshifts. By applying the Combo relation to a sample of 174 gamma-ray bursts, possible evidence of evolving dark energy parameter w(z) is investigated. The study reveals that dark energy's influence may not be negligible at larger redshifts, with potential deviations from the standard value of w = -1.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
C. Cai, S. L. Xiong, C. K. Li, C. Z. Liu, S. N. Zhang, X. B. Li, L. M. Song, B. Li, S. Xiao, Q. B. Yi, Y. Zhu, Y. G. Zheng, W. Chen, Q. Luo, Y. Huang, X. Y. Song, H. S. Zhao, Y. Zhao, Z. Zhang, Q. C. Bu, X. L. Cao, Z. Chang, L. Chen, T. X. Chen, Y. B. Chen, Y. Chen, Y. P. Chen, W. W. Cui, Y. Y. Du, G. H. Gao, H. Gao, M. Y. Ge, Y. D. Gu, J. Guan, C. C. Guo, D. W. Han, J. Huo, S. M. Jia, W. C. Jiang, J. Jin, L. D. Kong, G. Li, T. P. Li, W. Li, X. Li, X. F. Li, Z. W. Li, X. H. Liang, J. Y. Liao, B. S. Liu, H. W. Liu, H. X. Liu, X. J. Liu, F. J. Lu, X. F. Lu, T. Luo, R. C. Ma, X. Ma, B. Meng, Y. Nang, J. Y. Nie, G. Ou, J. L. Qu, X. Q. Ren, N. Sai, L. Sun, Y. Tan, L. Tao, Y. L. Tuo, C. Wang, L. J. Wang, P. J. Wang, W. S. Wang, Y. S. Wang, X. Y. Wen, B. B. Wu, B. Y. Wu, M. Wu, G. C. Xiao, Y. P. Xu, R. J. Yang, S. Yang, Y. J. Yang, Y. R. Yang, X. J. Yang, Q. Q. Yin, Y. You, F. Zhang, H. M. Zhang, J. Zhang, P. Zhang, S. Zhang, W. C. Zhang, W. Zhang, Y. F. Zhang, Y. H. Zhang, X. F. Zhao, S. J. Zheng, D. K. Zhou
Summary: The High Energy X-ray telescope on board the Insight-HXMT can serve as a gamma-ray monitor with high time resolution and large effective area. By improving the coherent search method, we were able to detect 40 GRBs that were too weak to be found in blind search, but did not find any significant burst associated with GW events.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
I Contopoulos, A. Strantzalis, D. Papadopoulos, D. Kazanas
Summary: The study focuses on long Gamma-Ray Bursts and proposes an electrodynamic model to explain their distinct characteristics, linking the sharp rise to the magnetic field winding by a fast-rotating core and the exponential decay to the electromagnetic spin-down of the core. Non-axisymmetric distortion generates gravitational waves with exponentially decreasing frequency, and specific time intervals are provided for testing the predicted waveforms in LIGO archival data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hao-Xuan Gao, Jin-Jun Geng, Lei Hu, Mao-Kai Hu, Guang-Xuan Lan, Chen-Ming Chang, Song-Bo Zhang, Xiao-Li Zhang, Yong-Feng Huang, Xue-Feng Wu
Summary: This study investigates the effects of gravitational lensing on gamma-ray burst orphan afterglows using three lens models and finds that the temporal characteristics can be used to diagnose lensed optical/X-ray orphan afterglows.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shaoqi Hou, Tao Zhu, Zong-Hong Zhu
Summary: This study examines the asymptotically flat spacetime in Chern-Simons modified gravity and investigates the gravitational memory effects. Findings suggest that if the Chern-Simons scalar does not directly couple with ordinary matter fields, it can induce displacement, spin, and center-of-mass memory effects similar to those in general relativity. However, interferometers and pulsar timing arrays are unable to detect the polarization of the scalar field.
Article
Astronomy & Astrophysics
Giovanni Gandolfi, Andrea Lapi, Stefano Liberati
Summary: The study focuses on self-gravitating equilibria of dark matter (DM) halos with non-minimal coupling to gravity, which results in the development of an inner core and a shape closely following the Burkert profile. This non-minimal coupling allows for mass distribution that fits well with rotation curves of dwarf, DM-dominated galaxies and is consistent with observed scaling relations among different galaxies.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Ehud Nakar, Tsvi Piran
Summary: This study focuses on the relationship between the viewing angle and jet opening angle in binary neutron star mergers. It presents a simple ratio formula and explains the inconsistency in previous research results. Various methods, such as VLBI measurements and afterglow transitions, are proposed to estimate the viewing angle and jet opening angle, with implications for measurements of the Hubble constant.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Ahmad Alachkar, John Ellis, Malcolm Fairbairn
Summary: OJ 287 is a binary system consisting of a primary black hole with a mass of approximately 18 billion solar masses and a secondary black hole with a mass of approximately 150 million solar masses. The secondary black hole orbits the primary in an eccentric orbit and triggers electromagnetic flares when it passes through the primary's accretion disk. The timing of these flares is consistent with the predictions of general relativity and limits the mass of a possible dark matter spike around the secondary black hole to less than or equal to 3% of the primary mass.
Article
Physics, Multidisciplinary
V De Luca, G. Franciolini, A. Riotto
Summary: The NANOGrav Collaboration recently published strong evidence for a stochastic gravitational wave background, which could be explained by second-order gravitational waves produced during the formation of primordial black holes. This research proposes two predictions: that primordial black holes may comprise the majority of dark matter and that the gravitational wave stochastic background will also be observed by the Laser Interferometer Space Antenna experiment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Hassan Firouzjahi, Mohammad Ali Gorji, Shinji Mukohyama, Borna Salehian
Summary: The model introduces a scenario of vector dark matter production during inflation, where the quantum fluctuations of the inflaton field energy are used to explain the observed relic density of dark matter, which can be applicable to a wide range of parameters.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Andreas Finke, Stefano Foffa, Francesco Lacovelli, Michele Maggiore, Michele Mancarella
Summary: This study presents a methodology for correlating 'dark sirens' with galaxy catalogs and explores improvements for gravitational wave detections. The results provide measurements of H-0 and Xi(0), showing interesting constraints for observing dark energy and modifications of gravity at cosmological scales. The study also discusses limits on modified GW propagation under certain conditions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
