9 papers
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…
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…
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…
Axial Quasi-normal Modes of Admixed Neutron Stars
Hamza Boumaza, Boris Betancourt Kamenetskaia
We study axial quasi-normal modes of admixed neutron stars composed of ordinary nuclear matter and a self-interacting bosonic dark matter component. The equilibrium configurations…
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…
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…