173 citations · 1.1k across the 43 of their papers we have counts for
43 papers
Timing Gravity with Pulsars in the Strong Field
Riccardo Della Monica, Ivan de Martino
We propose a novel approach for the timing of pulsars orbiting a supermassive black hole, which implements the fully relativistic calculations of the photon travel time into a robu…
Cosmological constraints and standard sirens forecasts for non-dynamical dark energy in Horndeski gravity
Marcello Miranda, Ruchika, Ivan De Martino +2
We investigate an analytically tractable sector of the Extended Cuscuton model, a non-dynamical dark-energy realization within the framework of viable Horndeski gravity. We focus o…
Pulsar timing in the Galactic Center
Riccardo Della Monica, Ivan de Martino
We propose a novel approach which implements the relativistic calculations of the photon travel time into a robust timing model for pulsars orbiting supermassive black holes. We de…
Constraining ultralight bosons in dwarf spheroidal galaxies with a radially varying anisotropy
Ivan De Martino
Axions, and axion-like particles, have come back into fashion in the last decades as a possible solution to the galactic-scale crisis suffered by the cold dark matter model. In the…
Constraints on metric-affine gravity black holes from the stellar motion at the Galactic Center
Ivan De Martino, Riccardo Della Monica, Diego Rubiera-Garcia
We consider a static, spherically symmetric space-time with an electric field arising from a quadratic metric-affine extension of General Relativity. Such a space-time is free of s…
The optical appearance of a nonsingular de Sitter core black hole geometry under several thin disk emissions
I. De Martino, R. Della Monica, D. Rubiera-Garcia
We consider the optical appearance under a thin accretion disk of a regular black hole with a central de Sitter core implementing far-corrections to the Schw…
Dynamics of Dwarf Galaxies in Scalar-Tensor-Vector-Gravity
Ivan De Martino
We have investigated whether the Scalar-Tensor-Vector Gravity theory (STVG) may explain the kinematic of stars in dwarf spheroidal galaxies. STVG modifies General Relativity by add…
Explaining the oblate morphology of dwarf spheroidals with Wave Dark Matter perturbations
Riccardo Della Monica, Ivan de Martino, Tom Broadhurst
We investigate whether the oblate, spheroidal morphology of common dwarf spheroidal galaxies (dSph) may result from the slow relaxation of stellar orbits within a halo of Wave Dark…
Constraining an Einstein-Maxwell-dilaton-axion black hole at the Galactic Center with the orbit of the S2 star
Rebeca Fernández Fernández, Riccardo Della Monica, Ivan de Martino
We derive new constraints on the dilaton parameter appearing in the spherically-symmetric black hole solution of Einstein-Maxwell-dilaton-axion gravity, by studying the geodesic mo…
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…
Bounding the mass of ultralight bosonic Dark Matter particles with the motion of the S2 star around Sgr A*
Riccardo Della Monica, Ivan de Martino
Dark matter is undoubtedly one of the fundamental, albeit unknown, components of the standard cosmological model. The failure to detect WIMPs, the most promising candidate particle…
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…
The Galactic Center as a laboratory for theories of gravity and dark matter
Mariafelicia de Laurentis, Ivan De Martino, Riccardo Della Monica
The Galactic Center of the Milky Way, thanks to its proximity, allows to perform astronomical observations that investigate physical phenomena at the edge of astrophysics and funda…
Dynamics of dwarf galaxies in gravity
Ivan de Martino, Antonaldo Diaferio, Luisa Ostorero
We use the kinematic data of the stars in eight dwarf spheroidal galaxies to assess whether gravity can fit the observed profiles of the line-of-sight velocity dispersion of…
The proper motion of stars in dwarf galaxies: distinguishing central density cusps from cores
Ivan de Martino, Antonaldo Diaferio, Luisa Ostorero
We show that measuring the proper motion of stars within a dwarf galaxy, with an uncertainty of 1 km/s at most, can establish whether the Dark Matter (DM) density pro…
Exploiting the Einstein Telescope to solve the Hubble tension
Matteo Califano, Ivan de Martino, Daniele Vernieri +1
We probe four cosmological models which, potentially, can solve the Hubble tension according to the dark energy equation of state. In this context, we demonstrate that the Einstein…
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…
Narrowing the allowed mass range of ultralight bosons with the S2 star
Riccardo Della Monica, Ivan de Martino
It is well known that N-body simulations of ultralight bosons show the formation of a solitonic dark matter core in the innermost part of the halo. The scale length of such a solit…
Constraining CDM cosmological parameters with Einstein Telescope mock data
Matteo Califano, Ivan de Martino, Daniele Vernieri +1
We investigate the capability of Einstein Telescope to constrain the cosmological parameters of the non-flat CDM cosmological model. Two types of mock datasets are considered de…
-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…
Detection of a universal core-halo transition in dwarf galaxies as predicted by Bose-Einstein dark matter
Alvaro Pozo, Tom Broadhurst, Ivan de Martino +4
The presence of large dark matter cores in dwarf galaxies has long been puzzling and many are now known to be surrounded by an extensive halo of stars. Distinctive core-halo struct…