26 citations · 101 across the 10 of their papers we have counts for
10 papers
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…
The CMB Cold Spot as predicted by foregrounds around nearby galaxies
Diego Garcia Lambas, Frode K. Hansen, Facundo Toscano +2
The non-Gaussian Cold Spot (CS) surrounded by its hot ring is one of the most striking features of the CMB. It has been speculated that either new physics or ISW effect induced by…
A possible common explanation for several cosmic microwave background (CMB) anomalies: A strong impact of nearby galaxies on observed large-scale CMB fluctuations
Frode K. Hansen, Ezequiel F. Boero, Heliana E. Luparello +1
In Luparello et al. 2023, a new and hitherto unknown CMB foreground was detected. A systematic decrease in Cosmic Microwave Background (CMB) temperatures around nearby large spiral…
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…
The cosmic shallows I: interaction of CMB photons in extended galaxy halos
Heliana E. Luparello, Ezequiel F. Boero, Marcelo Lares +2
We report and analyse the presence of foregrounds in the cosmic microwave background (CMB) radiation associated to extended galactic halos. Using the cross correlation of Planck an…
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…
Efficient gravitational lens optical scalars calculation of black holes with angular momentum
Ezequiel F. Boero, Osvaldo M. Moreschi
We provide new very simple and compact expressions for the efficient calculation of gravitational lens optical scalars for Kerr spacetime which are exact along any null geodesic. T…
Geometrical models for the study of astrophysical systems with spheroidal symmetry imbedded in a standard cosmology: The case of cosmic voids
Ezequiel F. Boero, Osvaldo M. Moreschi
We present a class of general prolate and oblate spheroidal spacetimes for the description of cosmic structures in the Universe. They are exact geometries which represent, in an ap…
Practical definition of averages of tensors in general relativity
Ezequiel F. Boero, Osvaldo M. Moreschi
We present a definition of tensor fields which are average of tensors over a manifold, with a straightforward and natural definition of derivative for the averaged fields; which in…
Gravitational lens optical scalars in terms of energy-momentum distributions in the cosmological framework
Ezequiel F. Boero, Osvaldo M. Moreschi
We present new results on gravitational lensing over a cosmological Robertson-Walker backgrounds which extend and generalize previous works. Our expressions show the presence of ne…