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9 papers · 1 filter
Synthetic gravitational lens image of the Sagittarius A black hole with a thin disk model
Ezequiel F. Boero, Osvaldo M. Moreschi
The images of Sagittarius A published by the Event Horizon Telescope (ETH) Collaboration in 2022 present features that were associated with an emission ring consistent with w…
Constraints on gravitational waves from the 2024 Vela pulsar glitch
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1774
Among known neutron stars, the Vela pulsar is one of the best targets for gravitational-wave searches. It is also one of the most prolific in terms of glitches, sudden frequency ch…
Junction conditions for higher order gravity theories from a Gibbons-Hawking-York boundary term
Marcos A. Ramirez, Cristián Martínez
In this work we study the problem of generalizing the Gibbons-Hawking-York boundary terms for general quadratic theories of gravity and propose a simple condition to obtain them. F…
Perturbative and numerical approach to plasma strong lensing
Gabriel Crisnejo, Emanuel Gallo, Ezequiel Boero +1
{Using two different approaches, we study imaging in the strong lens regime taking into account the effects of plasmatic environments on light propagation. First, we extend the use…
Strong gravitational lens image of the M87 black hole with a simple accreting matter model
Ezequiel F. Boero, Osvaldo M. Moreschi
We study simulated images generated from an accretion disk surrounding the supermassive black hole hosted in the nearby galaxy M87. We approach the problem employing very simple ac…
Thermodynamic instability of splitting thin shell solutions in braneworld Einstein-Gauss-Bonnet gravity
Marcos A. Ramirez
The thermodynamic stability of braneworld cosmological solutions in five-dimensional Einstein-Gauss-Bonnet gravity is addressed, particularly in the context of the splitting vacuum…