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Time Delay of Pulsar Signals in Astrophysical Black Hole Spacetimes
Parth Bambhaniya, Viraj Kalsariya, Saurabh +4
In this paper, we investigate the fully relativistic time delay of pulsar signals propagating in the vicinity of a rotating black hole and its potential mimickers, including a defo…
Gravitational signatures beyond Newton: exploring hierarchical three-body dynamics
Pietro Farina, Mariafelicia De Laurentis, Hideki Asada +2
Hierarchical three-body systems offer a compelling framework to explore the subtle interplay between Newtonian and relativistic gravitational effects in astrophysical environments.…
On the parameters of the spherically symmetric parametrized Rezzolla-Zhidenko spacetime through solar system tests, orbit of S2 star about Sgr A, and quasiperiodic oscillations
Sanjar Shaymatov, Bobomurat Ahmedov, Mariafelicia De Laurentis +4
In this paper, we find the higher order expansion parameters and of spherically symmetric parametrized Rezzolla--Zhidenko (PRZ) spacetime by using its functions of the radi…
Testing space-time geometries and theories of gravity at the Galactic Center with pulsar's time delay
Riccardo Della Monica, Ivan de Martino, Mariafelicia de Laurentis
We developed a numerical methodology to compute the fully-relativistic propagation time of photons emitted by a pulsar in orbit around a massive compact object, like the supermassi…
Response to: Comment on "Orbital precession of the S2 star in scalar-tensor-vector gravity"
Riccardo Della Monica, Ivan de Martino, Mariafelicia de Laurentis
The explicit derivation for the orbital precession of the S2 star in the Galactic Center in the Scalar-Tensor-Vector Gravity is discussed and compared with previous research. The t…
Testing Horndeski gravity with S2 star orbit
Riccardo Della Monica, Ivan de Martino, Daniele Vernieri +1
We have explored a completely new and alternative way to restrict the parameter space of Horndeski theory of gravity. Using its Newtonian limit, it is possible to test the theory a…
Are nonsingular black holes with super-Planckian hair ruled out by S2 star data?
M. Cadoni, M. De Laurentis, I. De Martino +3
We propose a novel nonsingular black-hole spacetime representing a strong deformation of the Schwarzschild solution with mass by an additional hair , which may be hierarc…
Constraining MOdified Gravity with the S2 Star
Riccardo Della Monica, Ivan de Martino, Mariafelicia de Laurentis
We have used publicly available kinematic data for the S2 star to constrain the parameter space of MOdified Gravity. Integrating geodesics and using a Markov Chain Monte Carlo algo…
Orbits in bootstrapped Newtonian gravity
Anna D'Addio, Roberto Casadio, Andrea Giusti +1
Bootstrapped Newtonian gravity is a non-linear version of Newton's law which can be lifted to a fully geometric theory of gravity starting from a modified potential. Here, we study…
Epicyclic frequencies in static and spherically symmetric wormhole geometries
Vittorio De Falco, Mariafelicia De Laurentis, Salvatore Capozziello
The measurement of the epicyclic frequencies is a widely used astrophysical technique to infer information on a given self-gravitating system and on the related gravity background.…
-gravity after the detection of the orbital precession of the S2 star around the Galactic centre massive black hole
Ivan de Martino, Riccardo della Monica, Mariafelicia de Laurentis
The GRAVITY Collaboration achieved the remarkable detection of the orbital precession of the S2 star around the Galactic centre supermassive black hole, providing yet another proof…
Orbital precession of the S2 star in Scalar-Tensor-Vector-Gravity
Riccardo Della Monica, Ivan de Martino, Mariafelicia de Laurentis
We have obtained the first constraint of the parameter space of Scalar-Tensor-Vector-Gravity using the motion of the S2-star around the supermassive black hole at the centre of the…
Constraints on black-hole charges with the 2017 EHT observations of M87*
Prashant Kocherlakota, Luciano Rezzolla, Heino Falcke +234
Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M8…
Modified Gravity and Cosmology: An Update by the CANTATA Network
Emmanuel N. Saridakis, Ruth Lazkoz, Vincenzo Salzano +50
General Relativity and the CDM framework are currently the standard lore and constitute the concordance paradigm. Nevertheless, long-standing open theoretical issues, as well as…
Reconstructing wormhole solutions in curvature based Extended Theories of Gravity
Vittorio De Falco, Emmanuele Battista, Salvatore Capozziello +1
Static and spherically symmetric wormhole solutions can be reconstructed in the framework of curvature based Extended Theories of Gravity. In particular, extensions of the General…
Testing wormhole solutions in extended gravity through the Poynting-Robertson effect
Vittorio De Falco, Emmanuele Battista, Salvatore Capozziello +1
We develop a model-independent procedure to single out static and spherically symmetric wormhole solutions based on the general relativistic Poynting-Robertson effect and the exten…
Tracing the cosmic history by Gauss-Bonnet gravity
Ivan de Martino, Mariafelicia De Laurentis, Salvatore Capozziello
Cosmic history can be traced considering further curvature contributions inside the gravitational action. Assuming that standard General Relativity can be extended by other curvatu…
General relativistic Poynting-Robertson effect to diagnose wormholes existence: static and spherically symmetric case
Vittorio De Falco, Emmanuele Battista, Salvatore Capozziello +1
We derive the equations of motion of a test particle in the equatorial plane around a static and spherically symmetric wormhole influenced by a radiation field including the genera…
Modified gravity revealed along geodesic tracks
Mariafelicia De Laurentis, Ivan De Martino, Ruth Lazkoz
The study of the dynamics of a two-body system in modified gravity constitutes a more complex problem than in Newtonian gravity. Numerical methods are typically needed to solve the…
How to tell an accreting boson star from a black hole
Hector Olivares, Ziri Younsi, Christian M. Fromm +6
The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive black hole candidates at horizon-scale resolutions offers a novel means to study gravity in it…
Observational constraints on Gauss-Bonnet cosmology
Micol Benetti, Simony Santos da Costa, Salvatore Capozziello +2
We analyze a fully geometric approach to dark energy in the framework of theories of gravity, where is the Ricci curvature scalar and is the Gauss-Bo…
Analysis of the Yukawa gravitational potential in gravity II: relativistic periastron advance
Mariafelicia De Laurentis, Ivan De Martino, Ruth Lazkoz
Alternative theories of gravity may serve to overcame several shortcomings of the standard cosmological model but, in their weak field limit, General Relativity must be recovered s…
Analysis of the Yukawa gravitational potential in gravity I: semiclassical periastron advance
Ivan De Martino, Ruth Lazkoz, Mariafelicia De Laurentis
The {\it concordance} cosmological model has been successfully tested throughout the last decades. Despite its successes, the fundamental nature of dark matter and dark energy is s…
Test-particle dynamics in general spherically symmetric black hole spacetimes
Mariafelicia De Laurentis, Ziri Younsi, Oliver Porth +2
To date, the most precise tests of general relativity have been achieved through pulsar timing, albeit in the weak-field regime. Since pulsars are some of the most precise and stab…