130 citations · 1.6k across the 87 of their papers we have counts for
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Constraints on Scalar--Tensor--Vector Gravity Theory Parameters Inferred from Quasiperiodic Oscillations
Marco Muccino, Kuantay Boshkayev, Binay Prakash Akhouri +2
We study circular geodesics of neutral test particles in the static charged solution of Scalar--Tensor--Vector Gravity (STVG), and we use the twin kilohertz quasiperiodic oscillati…
Cosmological consequences of scale-dependent Barrow-Tsallis entropy
Giuseppe Gaetano Luciano, Orlando Luongo, Marco Muccino
We investigate an extended cosmological scenario based on the Barrow-Tsallis entropy, incorporating a varying (i.e., energy-scale-dependent) anomalous dimension. This behavior is r…
The macroscopic precession model of quasi-periodic oscillations for rotating compact objects
Orlando Luongo, Marco Muccino
The relativistic precession model (RPM) interprets the twin kilohertz quasi-periodic oscillations (QPOs) as geodesic frequencies of test particles orbiting in the spacetime of X-ra…
The macroscopic precession model: describing quasi-periodic oscillations including internal structures of test bodies
Gabriele Bianchini, Orlando Luongo, Marco Muccino
The relativistic precession model (RPM) is widely-considered as a benchmark framework to interpret quasi-periodic oscillations (QPOs), albeit several observational inconsistencies…
Cosmological and lunar laser ranging constraints on evolving dark energy in a nonminimally coupled curvature-matter gravity model
Riccardo March, Miguel Barroso Varela, Orfeu Bertolami +3
We analyze a cosmological solution to the field equations of a modified gravity model where curvature and matter are nonminimally coupled. The current Universe's accelerated expans…
Constraints on the Sen black hole mass and charge from quasi-periodic oscillations
Kuantay Boshkayev, Marco Muccino
We analyze quasi-periodic oscillation data from selected X-ray binary systems hosting black holes. To model the spacetime geometry, we resort the static Sen solution -- originally…
Effects of matter with anisotropic pressure on the Fan-Wang regular black hole shadows
Yergali Kurmanov, Orlando Luongo, Daulet Berkimbayev +4
We here investigate the consequences of an exotic fluid, exhibiting negative radial and tangential pressures, \emph{de facto} violating the Zel'dovich limit, on a regular solution…
Impact of a complex scalar spectator field on baryon asymmetry within spontaneous baryogenesis
Mattia Dubbini, Orlando Luongo, Marco Muccino
We extend the framework of spontaneous baryogenesis by investigating the generation of baryon asymmetry when the inflaton, , is minimally coupled with a complex spectator scalar…
Consequences of non-minimal coupling for mass mixing in spontaneous baryogenesis
Mattia Dubbini, Orlando Luongo, Marco Muccino
We investigate the impact of a non-minimal Yukawa-like coupling between curvature and inflaton field within the \emph{spontaneous baryogenesis} background. We demonstrate that this…
Generalizing the relativistic precession model of quasi-periodic oscillations through anharmonic corrections
Roberto Giambò, Orlando Luongo, Marco Muccino +1
We critically reanalyze the relativistic precession model of quasi-periodic oscillations, exploring its natural extension beyond the standard harmonic approximation. To do so, we s…
Geometric properties versus particle motion in the Fan-Wang spacetime
Gulnara Suliyeva, Kuantay Boshkayev, Talgar Konysbayev +7
In this work, we explore general relativistic effects and geometric properties of the Fan-Wang spacetime, one of the simplest regular solutions that can be obtained in nonlinear el…
Accretion disk luminosity around rotating naked singularities
Yergali Kurmanov, Kuantay Boshkayev, Talgar Konysbayev +6
We explore circular geodesics of neutral test particles in the gravitational field of a rotating deformed mass. The geometry around this source is described by the Quevedo-Mashhoon…
Double polytropic cosmic acceleration from the Murnaghan equation of state
Peter K. S. Dunsby, Orlando Luongo, Marco Muccino +1
We consider a double polytropic cosmological fluid and demonstrate that, when one constituent resembles a bare cosmological constant while the other emulates a generalized Chaplygi…
Equivalence principle violation in nonminimally coupled gravity and constraints from Lunar Laser Ranging
Riccardo March, Orfeu Bertolami, Marco Muccino +1
We analyze the dynamics of the Sun-Earth-Moon system in the context of a particular class of theories of gravity where curvature and matter are nonminimally coupled (NMC). These th…
Unifying the dark sector through a single matter fluid with non-zero pressure
Peter K. S. Dunsby, Orlando Luongo, Marco Muccino
We explore a generalised unified dark energy model that incorporates a non-minimal interaction between a tachyonic fluid and an additional scalar field. Specifically, we require th…
Luminosity of accretion disks around rotating regular black holes
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov +4
We consider thin accretion disks in the field of a class of rotating regular black holes. For this purpose, we obtain the radius of the innermost stable circular orbit, …
Accretion disk in the Hartle-Thorne spacetime
Yergali Kurmanov, Marco Muccino, Kuantay Boshkayev +4
We consider the circular motion of test particles in the gravitational field of a rotating deformed object described by the Hartle-Thorne metric. This metric represents an approxim…
Numerical analysis of quasi-periodic oscillations with spherical spacetimes
Kuantay Boshkayev, Orlando Luongo, Marco Muccino
We numerically test quasi-periodic oscillations using three theoretically-motivated models of spacetime adopting neutron star sources. Then, we compare our findings with a spherica…
Numerical analyses of M31 dark matter profiles
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov +4
We reproduce the rotation curve of the Andromeda galaxy (M31) by taking into account its bulge, disk, and halo components, considering the last one to contain the major part of dar…
Healing the cosmological constant problem during inflation through a unified quasi-quintessence matter field
Rocco D'Agostino, Orlando Luongo, Marco Muccino
We heal the cosmological constant problem by means of a \emph{cancellation mechanism} that adopts a phase transition during which quantum fluctuations are eliminated. To this purpo…
Cassini and extra force constraints to nonminimally coupled gravity with screening mechanism
Riccardo March, Orfeu Bertolami, Marco Muccino +2
We consider a nonminimally coupled curvature-matter gravity theory at the Solar System scale. Both a fifth force of Yukawa type and a further non-Newtonian extra force that arises…
Neutrino oscillation in the -metric
Kuantay Boshkayev, Orlando Luongo, Marco Muccino
We investigate neutrino oscillation in the field of an axially symmetric space-time, employing the so-called -metric, in the context of general relativity. Following the standar…
Constraining a nonminimally coupled curvature-matter gravity model with ocean experiments
Riccardo March, Orfeu Bertolami, Marco Muccino +2
We examine the constraints on the Yukawa regime from the non-minimally coupled curvature-matter gravity theory arising from deep underwater ocean experiments. We consider the geoph…
Kinematic and statistical inconsistencies of Hoava-Lifshitz cosmology
Orlando Luongo, Marco Muccino, Hernando Quevedo
We investigate the validity of a \emph{minimal} cosmological model derived from the renormalizable Hoava action at low redshift scales by using different cosmol…