48 citations · 119 across the 24 of their papers we have counts for
25 papers
Reconstructing the Dark Matter Equation of State with Compact Object Inspirals
Boris Betancourt Kamenetskaia, Qianhang Ding, Hui-Yu Zhu
We investigate the gravitational wave (GW) signatures of compact binaries embedded in extended dark matter (DM) configurations in hydrostatic equilibrium. If a neutron star is surr…
Cosmological signals of dark matter semi-annihilation
Boris Betancourt Kamenetskaia, Mathias Garny, Alejandro Ibarra +2
The growth of primordial density fluctuations in the early Universe leads to an inhomogeneous dark matter distribution at high redshift, where semi-annihilation processes of the fo…
Axial Quasi-normal Modes of Boson-Fermion Stars
Hamza Boumaza, Boris Betancourt Kamenetskaia
We study axial quasi-normal modes of boson-fermion stars composed of ordinary nuclear matter and a self-interacting bosonic dark matter component. The equilibrium configurations ar…
Gravitational Waves from Mergers of Asymmetric Dark Stars
Boris Betancourt Kamenetskaia, Qianhang Ding, Chris Kouvaris
A strongly self-interacting component of asymmetric dark matter (DM) particles can form compact dark stars (DSs). These objects have a broad spectrum of masses and radii, with dist…
GRB~250704B/EP250704a a Short Gamma-Ray Burst Powered by a Magnetar
Nissim Fraija, Antonio Galván, Boris Betancourt Kamenetskaia +1
GRB~250704B/EP250704a, identified as a short gamma-ray burst (sGRB), exhibited prolonged X-ray emission following the prompt phase and, in optical and infrared (IR) bands, an unusu…
Closure Relations of Synchrotron Self-Compton from Reverse shock and Fermi-LAT GRBs
Nissim Fraija, B. Betancourt Kamenetskaia, Antonio Galván Gámez +2
Synchrotron radiation from the reverse- and forward-shock regions typically describes the evolution of temporal and spectral features given by the closure relations (CRs) during th…
Dark matter spikes with strongly self-interacting particles
Boris Betancourt Kamenetskaia, Motoko Fujiwara, Alejandro Ibarra +1
An unavoidable prediction of scenarios with Dark Matter (DM) self-interactions is the existence of number changing processes that convert initial DM particles into final on…
Investigating sub-MeV dark matter annihilation to neutrinos using direct detection experiments
Boris Betancourt Kamenetskaia, Jong-Chul Park, Merlin Reichard +1
Dark matter (DM) could self-annihilate into neutrinos in dense regions of the Universe. We consider the resulting flux of neutrinos from the Milky Way DM halo and derive exclusion…
Imprints of energy injection by compact dark stars in the 21-cm signal
Boris Betancourt Kamenetskaia, Alejandro Ibarra, Chris Kouvaris
A strongly self-interacting component of asymmetric dark matter particles can form compact dark stars. The high dark matter density in these objects may allow significant dark matt…
Synchrotron self-Compton in a radiative-adiabatic fireball scenario: Modelling the multiwavelength observations in some Fermi/LAT bursts
Nissim Fraija, P. Veres, B. Betancourt Kamenetskaia +4
Energetic GeV photons expected from the closest and the most energetic Gamma-ray bursts (GRBs) provide an unique opportunity to study the very-high-energy emission as well as the p…
Polarization Measurements as a Probe of Axion-Photon Coupling: a Study of GRB 221009A
Boris Betancourt Kamenetskaia, Nissim Fraija, Gonzalo Herrera
Axion Like Particles (ALPs) can be produced in Gamma Ray Bursts, altering the polarization of the electromagnetic emission in these events. For the first time, we derive bounds on…
Microphysical Parameter Variation in GRB Stratified Afterglows and Closure Relations: from sub-GeV to TeV Observations
Nissim Fraija, Maria G. Dainotti, Boris Betancourt Kamenetskaia +2
Gamma-ray bursts (GRBs) are one of the most exciting sources that offer valuable opportunities for investigating the evolution of energy fraction given to magnetic fields and parti…
An Explanation of GRB Fermi-LAT Flares and High-Energy Photons in Stratified Afterglows
Nissim Fraija, Boris Betancourt Kamenetskaia, Antonio Galván-Gámez +6
The second {\itshape Fermi}/LAT gamma-ray burst (GRB) catalog (2FLGC) spanning the first decade of operations by the LAT collaboration was recently released. The closure relations…
Off-axis Afterglow Closure Relations and Fermi-LAT Detected Gamma-Ray Bursts
Nissim Fraija, M. G. Dainotti, D. Levine +2
Gamma-ray bursts (GRBs) are one of the most promising transient events for studying multi-wavelength observations in extreme conditions. Observation of GeV photons from bursts woul…
Closure Relations of Synchrotron Self-Compton in Afterglow stratified medium and Fermi-LAT Detected Gamma-Ray Bursts
Nissim Fraija, Maria G. Dainotti, B. Betancourt Kamenetskaia +2
The Second Gamma-ray Burst Catalog (2FLGC) was announced by the Fermi Large Area Telescope (Fermi-LAT) Collaboration. It includes 29 bursts with photon energy higher than 10 GeV. G…
Polarization From A Radially Stratified Off-Axis GRB Outflow
A. C. Caligula do E. S. Pedreira, N. Fraija, A. Galvan-Gamez +5
While the dominant radiation mechanism gamma-ray bursts (GRBs) remains a question of debate, synchrotron emission is one of the foremost candidates to describe the multi-wavelength…
Afterglow Polarization from Off-Axis GRB Jets
A. C. Caligula do E. S. Pedreira, N. Fraija, A. Galvan-Gamez +5
As we further our studies on Gamma-ray bursts (GRBs), both on theoretical models and observational tools, more and more options begin to open for exploration of its physical proper…
Exploring the Early Afterglow Polarization of GRB 190829A
A. C. Caligula do E. S. Pedreira, N. Fraija, S. Dichiara +5
The GRB 190829A has been widely studied due to its nature and the high energy emission presented. Due to the detection of a very-high-energy component by the High Energy Stereoscop…
GRB Afterglow of the Sub-relativistic Materials with Energy Injection
N. Fraija, B. Betancourt Kamenetskaia, A. Galvan-Gamez +5
Sub-relativistic materials launched during the merger of binary compact objects and the core-collapse of massive stars acquire velocity structures when expanding in a stratified en…
Modeling Gamma-ray burst Afterglow observations with an Off-axis Jet emission
Nissim Fraija, Antonio Galvan-Gamez, Boris Betancourt Kamenetskaia +5
Gamma-ray bursts (GRBs) are fascinating extragalactic objects. They represent a fantastic opportunity to investigate unique properties not exhibited in other sources. Multi-wavelen…
Decelerated sub-relativistic material with energy Injection
B. Betancourt Kamenetskaia, N. Fraija, M. Dainotti +3
We investigate the evolution of the afterglow produced by the deceleration of the non-relativistic material due to its surroundings. The ejecta mass is launched into the circumstel…
A theoretical model of an off-axis GRB jet
B. Betancourt Kamenetskaia, N. Fraija, M. Dainotti +3
In light of the most recent observations of late afterglows produced by the merger of compact objects or by the core-collapse of massive dying stars, we research the evolution of t…
Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium
N. Fraija, B. Betancourt Kamenetskaia, M. G. Dainotti +4
We present the afterglow light curves produced by the deceleration of the non-relativistic ejecta mass in a stratified circumstellar medium with a density profile $n(r)\propto r^{-…
Modeling the observations of GRB 180720B: From radio to sub-TeV gamma-rays
N. Fraija, S. Dichiara, A. C. Caligula do E. S. Pedreira +6
Early and late multiwavelength observations play an important role in determining the nature of the progenitor, circumburst medium, physical processes and emitting regions associat…