454 citations · 5.4k across the 78 of their papers we have counts for
25 papers · 1 filter
Forecasting constraints on deviations from general relativity in gravity with standard sirens
Rocco D'Agostino, Rafael C. Nunes
In this work, we explore how modified gravity theories based on the non-metricity scalar, known as gravity, affect the propagation of gravitational waves from inspiraling of…
Search for sub-solar mass binaries with Einstein Telescope and Cosmic Explorer
Rafael C. Nunes
A possible detection of sub-solar mass ultra-compact objects would lead to new perspectives on the existence of black holes that are not of astrophysical origin and/or pertain to f…
Searching for modified gravity in the astrophysical gravitational wave background: Application to ground-based interferometers
Rafael C. Nunes
We investigate how the propagation of an astrophysical gravitational wave background (AGWB) is modified over cosmological volumes when considering theories beyond general relativit…
Forecasts on the speed of gravitational waves at high
Alexander Bonilla, Rocco D'Agostino, Rafael C. Nunes +1
The observation of GW170817 binary neutron star (BNS) merger event has imposed strong bounds on the speed of gravitational waves (GWs) locally, inferring that the speed of GWs prop…
Probing observational bounds on scalar-tensor theories from standard sirens
Rocco D'Agostino, Rafael C. Nunes
Standard sirens are the gravitational wave (GW) analog of the astronomical standard candles, and can provide powerful information about the dynamics of the Universe. In this work,…
Forecast constraints on gravity with gravitational waves from compact binary coalescences
Rafael C. Nunes, Marcio E. S. Alves, Jose C. N. de Araujo
The direct detection of gravitational waves (GWs) opened a new chapter in the modern cosmology to probe possible deviations from the general relativity (GR) theory. In the present…
New observational constraints on gravity through gravitational-wave astronomy
Rafael C. Nunes, Supriya Pan, Emmanuel N. Saridakis
We investigate the new observational constraints on gravity that arise from the effects of primordial gravitational waves (GWs) on the cosmic microwave background (CMB) anis…
Primordial gravitational waves in Horndeski gravity
Rafael C. Nunes, Marcio E. S. Alves, Jose C. N. de Araujo
We investigate the propagation of primordial gravitational waves within the context of the Horndeski theories, for this, we present a generalized transfer function quantifying the…
Cosmological implications of scale-independent energy-momentum squared gravity: Pseudo nonminimal interactions in dark matter and relativistic relics
Ozgur Akarsu, Nihan Katirci, Suresh Kumar +2
In this paper, we introduce a scale-independent energy-momentum squared gravity (EMSG) that allows different gravitational couplings for different types of sources, which may lead…
Structure formation in gravity and a solution for tension
Rafael C. Nunes
We investigate the evolution of scalar perturbations in teleparallel gravity and its effects on the cosmic microwave background (CMB) anisotropy. The gravity generali…
Nonlocal Teleparallel Cosmology
Sebastian Bahamonde, Salvatore Capozziello, Mir Faizal +1
Even though it is not possible to differentiate General Relativity from Teleparallel Gravity using classical experiments, it could be possible to discriminate between them by quant…
A new interacting two fluid model and its consequences
German S. Sharov, Subhra Bhattacharya, Supriya Pan +2
In the background of a homogeneous and isotropic spacetime with zero spatial curvature, we consider interacting scenarios between two barotropic fluids, one is the pressureless dar…
Tsallis and Kaniadakis statistics from the viewpoint of entropic gravity formalism
Everton M. C. Abreu, Jorge Ananias Neto, Edesio M. Barboza +1
It has been shown in the literature that effective gravitational constants, which are derived from Verlinde's formalism, can be used to introduce the Tsallis and Kaniadakis statist…
Entropic gravity from noncommutative black holes
Rafael C. Nunes, Hooman Moradpour, Edésio M. Barboza +2
In this paper we will investigate the effects of a noncommutative (NC) space-time on the dynamics of the universe. We will generalize the black hole entropy formula for a NC black…
Gravitational Baryogenesis in Running Vacuum models
V. K. Oikonomou, Supriya Pan, Rafael C. Nunes
We study the gravitational baryogenesis mechanism for generating baryon asymmetry in the context of running vacuum models. Regardless if these models can produce a viable cosmologi…
Observational Constraints on gravity from varying fundamental constants
Rafael C. Nunes, Alexander Bonilla, Supriya Pan +1
We use observations related to the variation of fundamental constants, in order to impose constraints on the viable and most used gravity models. In particular, for the fine…
Gravitationally induced particle production and its impact on structure formation
Rafael C. Nunes
In this paper we investigate the influence of a continuous particles creation processes on the linear and nonlinear matter clustering, and its consequences on the weak lensing effe…
New observational constraints on f(T) gravity from cosmic chronometers
Rafael C. Nunes, Supriya Pan, Emmanuel N. Saridakis
We use the local value of the Hubble constant recently measured with 2.4% precision, as well as the latest compilation of cosmic chronometers data, together with standard probes su…
Connecting inflation with late cosmic acceleration by particle production
Rafael C. Nunes
A continuous process of creation of particles is investigated as a possible connection between the inflationary stage with late cosmic acceleration. In this model, the inflationary…
Cosmological consequences of an adiabatic matter creation process
Rafael C. Nunes, Supriya Pan
In this paper we investigate the cosmological consequences of a continuous matter creation associated with the production of particles by the gravitational field acting on the quan…
A note on the relations between thermodynamics, energy definitions and Friedmann equations
H. Moradpour, Rafael C. Nunes, Everton M. C. Abreu +1
In what follows, we investigate the relation between the Friedmann and thermodynamic pressure equations, through solving the Friedmann and thermodynamic pressure equations simultan…
Probing the cosmological viability of non-gaussian statistics
Rafael C. Nunes, Edésio M. Barboza, Everton M. C. Abreu +1
Based on the relationship between thermodynamics and gravity we propose, with the aid of Verlinde's formalism, an alternative interpretation of the dynamical evolution of the Fried…
Phantom behavior via cosmological creation of particles
Rafael C. Nunes, Diego Pavón
Recent determinations of the equation of state of dark energy hint that this may well be of the phantom type, i.e., . If confirmed by future experiments, this would st…
Thermodynamic aspects of dark energy fluids
Edésio M. Barboza, Rafael C. Nunes, Éverton M. C. Abreu +1
In this paper we have investigated the limits imposed by thermodynamics on a dark energy fluid. We have obtained the heat capacities and the compressibilities for a dark energy flu…