Article
Astronomy & Astrophysics
Celia Escamilla-Rivera, Geovanny Rave-Franco, Jackson Levi-Said
Summary: In this work, a cosmography in f(T,B) gravity is presented, which reduces degeneracy between various f(T,B) models. The model is constrained using Pantheon SNeIa compilation, cosmic chronometers, and a newly calibrated GRB data sample. By appropriately including cosmographic parameters, a viable cosmology is produced within f(T,B) gravity.
Article
Physics, Particles & Fields
M. Z. Bhatti, Z. Yousaf, S. Hanif
Summary: This study investigates the existence of complexity in terms of f(T) gravity, focusing on the division of intrinsic curvature in an orthogonal way and the correlation between various mass definitions and the conformal tensor. The impact of local anisotropy and the homogeneity or inhomogeneity of energy density is considered. The study establishes relationships between already defined variables and interprets complexity as a scalar Y-TF. Specific interior solutions satisfying the criterion of vanishing scalar Y-TF are determined.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Mathematical
Lakhan Jaybhaye, Sanjay Mandal, P. K. Sahoo
Summary: In this paper, we extend the Hilbert-Einstein action to analyze several interesting features of the theory, deriving motion equations and energy conditions. By using cosmographic parameters, we constrain the model parameters and observe the current accelerated expansion of the universe.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sabina Yeasmin, Biswajit Deb, Atri Deshamukhya
Summary: In this work, warm inflation in the background of f (R, T) gravity under strong dissipation regime is explored. Modified field equations are derived considering scalar field for FLRW universe. Slow-roll parameters, power spectrum, and spectral indices for scalar and tensor perturbations are deduced. The study shows that both Chaotic and Natural potentials can be revived under the context of f(R, T) gravity with suitable choice of model parameters, and the results are consistent with Planck 2018 and BICEP/Keck bounds at both Planckian and sub-Planckian energy scales within the warm inflationary scenario.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Alexey Golovnev, Maria-Jose Guzman
Summary: In this study, boosted and rotated tetrad backgrounds for the Minkowski space arc in f(T) gravity were analyzed. The research showed that certain Lorentz modes may exhibit nontrivial dynamics and propagate in time, suggesting the existence of additional modes in the Lorentzian sector which have not been seen in Lorentz-violating modified gravities. However, this discovery also raises doubts about the theoretical viability of these models.
Article
Physics, Mathematical
Allah Ditta, Tiecheng Xia
Summary: The commitment of this work is to find solutions for compact stellar models using the spherically symmetric static space-time and anisotropic matter distribution in the framework of f(T, T) gravity. The authors used specific metric functions and evaluated their solutions based on the Karmarkar condition. By incorporating observational data, they demonstrate the graphical fit and physical admissibility of their solutions.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Physics, Particles & Fields
K. Dialektopoulos, G. Leon, A. Paliathanasis
Summary: The Noether symmetry analysis is used to investigate a multiscalar field cosmological model in teleparallel gravity. Specifically, the study focuses on two scalar fields interacting in scalar-torsion theory. The field equations are described in a minisuperspace framework, and the evolution of physical variables depends on the potential function governing the dynamics of the scalar fields. By requiring the field equations to possess non-trivial Noether point symmetries and utilizing the first theorem of Noether, restrictions are imposed on the functional forms of the potential. Finally, symmetry vectors and corresponding conservation laws are employed to determine exact and analytic solutions in multiscalar-torsion cosmology.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Aylin Caliskan, Rana Muhammad Zulqarnain, Ertan Gudekli, Imran Siddique, Hijaz Ahmad, Sameh Askar
Summary: This paper explores new neutron star models based on spherically symmetric space-time using f(T,T) gravity theory. By incorporating off-diagonal tetrad and employing junction equations, the properties of compact stars are investigated thoroughly, including energy density, pressure profiles, anisotropy, equation of state, and stability.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Article
Astronomy & Astrophysics
Salvatore Capozziello, Rocco D'Agostino
Summary: This article explores non-local modifications of General Relativity by considering a distortion function in terms of the inverse of the d'Alembert operator. By using numerical methods and a model-independent approach based on current observations, the shape of the distortion function is reconstructed, and the best analytical approximation of the non-local Lagrangian is inferred. The results show that this non-local modification provides a natural explanation for late cosmic acceleration and avoids fine-tuning issues with the cosmological constant.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Particles & Fields
Sebastian Bahamonde, Konstantinos F. Dialektopoulos, Manuel Hohmann, Jackson Levi Said, Christian Pfeifer, Emmanuel N. Saridakis
Summary: This study focuses on the cosmological perturbation theory in f(T) gravity, which is a simple extension of the teleparallel equivalent of general relativity. The authors examine the possibility of a non-flat FLRW background solution and perform perturbations for different spatial geometries. They determine the behavior of the perturbative modes in this non-flat FLRW setting for arbitrary f(T) models and identify propagating modes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
F. M. Belchior, A. R. P. Moreira, R. V. Maluf, C. A. S. Almeida
Summary: In this paper, we investigate the influence of torsion scalar T and boundary term B on the confinement of both the gauge vector and Kalb-Ramond fields in modified teleparallel gravity. We propose a Stueckelberg-like geometrical coupling that non-minimally couples the fields to the torsion scalar and boundary term. We use the first-order formalism and two kinds of superpotential to set up our braneworld models. The geometrical coupling is used to produce a localized zero mode, and we analyze the massive spectrum for both fields to obtain possible resonant massive modes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Celia Escamilla-Rivera, Hernando Quevedo
Summary: Proposing an alternative cosmography using Horava-Lifshitz gravity as a model for quantum gravity, the study suggests that the Universe appears flat classically according to the ΛCDM model, but is actually curved from a quantum perspective. The findings indicate a non-flat scenario and a specific value for the Horava parameter that could be interpreted as a measure of a quantum effect.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Celia Escamilla-Rivera, Jose Maria de Albornoz-Caratozzolo, Sebastian Najera
Summary: In this study, a specific self-tuning filter solution focused on a zero-curvature fixed point is used to investigate the H-0 tension in the context of the Fab-Four theory of gravity. The equations in this scheme restrict the universe's evolution to different scenarios, including radiation-like expansion, matter-like expansion, and late-time acceleration. By constructing the cosmographic series of the Fab-Four theory, the kinematic parameters such as the Hubble constant H-0 and the deceleration parameter q0 are obtained for all the mentioned scenarios. The results show that the current discrepancy on H-0 can be alleviated by incorporating specific requirements on the free parameters of the Fab-Four theory through a self-tuning filter.
Article
Astronomy & Astrophysics
Andrew DeBenedictis, Saga Ilijic, Marko Sossich
Summary: This paper studies the properties that the vacuum must have in the minimal extension of the teleparallel equivalent of general relativity. It is found that the mathematical conditions on the vacuum mimic those of general relativity and that certain restrictions on the existence of smooth horizons and singularities are necessary. The analysis also suggests that static spherical matter distributions may have extra restrictions on their spatial extent and stress-energy bounds to ensure the validity of vacuum solutions.
Article
Physics, Multidisciplinary
M. Zubair, Allah Ditta, Saira Waheed, Francisco Tello-Ortiz
Summary: This paper studies the structure of compact objects such as PSRJ 1614 - 2230, LMXB 4U1608 - 52, CenX - 3, EX01785 - 248, and SMCX - 1 in the framework of f(T, tau) gravity. The study finds that the constructed model matches well with the realistic nature of compact stars.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Engineering, Aerospace
Dusko Borka, Vesna Borka Jovanovic, Salvatore Capozziello, Predrag Jovanovic
Summary: We study the velocity distribution of elliptical galaxies within the framework of Non-local Gravity. This approach allows us to reproduce the fundamental plane of elliptical galaxies without assuming the presence of dark matter. By comparing theoretical predictions with observed data, we find that non-local gravity effects can successfully explain the stellar dynamics in elliptical galaxies.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
Filippo Bouche, Salvatore Capozziello, Vincenzo Salzano
Summary: Alternative cosmological models are being studied as potential solutions to the weaknesses of the lambda CDM model. Tensions have emerged between the model-dependent analysis of the Cosmic Microwave Background and lower redshift probes as cosmological surveys improve. Two quantum-inspired non-locally extended theories of gravity are reviewed, focusing on their cosmological implications and their potential to address the Hubble and growth tensions. The Deser-Woodard model shows promising features, while further investigation is needed for the non-local cosmology based on Noether symmetries.
Article
Astronomy & Astrophysics
M. G. Dainotti, G. Bargiacchi, A. L. Lenart, S. Nagataki, S. Capozziello
Summary: Currently, the cold dark matter model along with a cosmological constant is the best representation of the universe. However, we lack information in the high-redshift region and the study of quasars up to z = 7.54 has provided important insights into the matter density parameter omega( M ). This demonstrates the reliability of quasars as standard cosmological candles.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Aleksander Lukasz Lenart, Giada Bargiacchi, Maria Giovanna Dainotti, Shigehiro Nagataki, Salvatore Capozziello
Summary: By studying high-redshift objects such as quasars, the value of the Hubble constant can be corrected, which can help resolve the current discrepancy between the cosmic microwave background radiation and the value obtained from Type Ia supernovae observations.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Physics, Mathematical
Salvatore Capozziello, Maurizio Capriolo, Gaetano Lambiase
Summary: The issue of defining gravitational energy in a given spatial region is still unresolved in General Relativity, except for particular cases of localized objects. In this study, we generalize the Einstein gravitational energy-momentum pseudotensor to non-local theories of gravity and consider analytic functions of the non-local integral operator ?(-1). By applying the Noether theorem to a gravitational Lagrangian invariant under infinitesimal rigid translations, we define a gravitational energy-momentum pseudotensor that transforms like a tensor under affine transformations. This pseudotensor, along with the energy-momentum complex, can be derived using the continuity equations considering gravitational and matter components, and their weak field limit is performed for astrophysical applications.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
S. Capozziello, S. Zare, D. F. Mota, H. Hassanabadi
Summary: In this study, the effects of a dark matter spike near the supermassive black hole in M87 (Virgo A galaxy) were investigated using the Bumblebee Gravity theory. The aim was to determine the impact of spontaneous Lorentz symmetry breaking on the horizon, ergo-region, and shadow of the Kerr Bumblebee black hole in the spike region. Dark matter distribution was incorporated into a Lorentz-violating spherically symmetric space-time, and the resulting solution was generalized to a Kerr Bumblebee black hole. The shapes of the shadow were examined based on observational data for the dark matter spike density and radius.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Salvatore Capozziello, Maria Caruana, Jackson Levi Said, Joseph Sultana
Summary: Teleparallel geometry provides a theoretical framework where gravitational interaction is mediated by torsion rather than curvature. Teleparallel analogue of Horndeski gravity is an approach within this framework considering scalar-tensor theories. It is a more general formalism than the standard metric one, allowing for a wider range of teleparallel Horndeski gravity models. The article explores constraints on these models in terms of ghost and Laplacian instabilities and finds that a large class of models is physically viable.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Maria Giovanna Dainotti, Giada Bargiacchi, Malgorzata Bogdan, Aleksander Lukasz Lenart, Kazunari Iwasaki, Salvatore Capozziello, Bing Zhang, Nissim Fraija
Summary: By combining high-redshift probes such as GRBs and QSOs with other observational data, it is shown that alternative cosmological models could potentially explain the discrepancy in the Hubble constant. This study uses data from GRBs and QSOs, and applies statistical methods to reduce uncertainties in the estimation of cosmological parameters.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Salvatore Capozziello, Gamal G. L. Nashed
Summary: We derive a novel class of four-dimensional black hole solutions in Gauss-Bonnet gravity coupled with a scalar field in the presence of Maxwell electrodynamics. The choice of metric ansatz and the presence of the scalar field lead to the emergence of higher-order terms and the creation of monopoles in the metric potentials. The computed invariants associated with the black holes show soft singularities and the solutions exhibit multiple horizons depending on the spacetime.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello, Valerio Faraoni
Summary: The physical nature of Horndeski gravity is explained as a dissipative effective fluid in a new approach. Requiring the constitutive equations of a Newtonian fluid restricts the theory to two subclasses of viable Horndeski gravity. A linear stress-energy tensor of the Horndeski effective fluid is sufficient for gravitational waves to propagate at light speed, while other Horndeski theories correspond to exotic non-Newtonian effective fluids. The two linear Horndeski classes are further studied in the framework of first-order thermodynamics of viscous fluids.
GENERAL RELATIVITY AND GRAVITATION
(2023)
Article
Astronomy & Astrophysics
Matteo Califano, Ivan de Martino, Daniele Vernieri, Salvatore Capozziello
Summary: We investigate four cosmological models that may solve the Hubble tension by considering different dark energy equation of state. By creating mock catalogs and extracting events associated with possible electromagnetic counterpart, we estimate the precision to which the Einstein Telescope can bound the cosmological parameters. Our results show that the uncertainty in the Hubble constant is always below 1%, potentially offering a solution to the Hubble tension. The accuracy on other cosmological parameters is comparable to current methods, except for the emergent dark energy model where the Einstein Telescope alone can significantly improve the limits.
Article
Astronomy & Astrophysics
Ester Piedipalumbo, Stefano Vignolo, Pasquale Feola, Salvatore Capozziello
Summary: In this study, we investigate the non-flat interacting quintessence cosmology within the framework of scalar-tensor gravity, where a scalar field interacts with dark matter. By employing the Noether Symmetry Approach, we obtain general exact solutions for cosmological equations and determine the scalar-field self-interaction potentials. The obtained solutions are capable of reproducing the accelerated expansion of the Universe and are consistent with various observational datasets, including the SNeIa Pantheon data, gamma ray bursts Hubble diagram, and direct measurements of the Hubble parameter.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Particles & Fields
Vittorio De Falco, Francesco Bajardi, Rocco D'Agostino, Micol Benetti, Salvatore Capozziello
Summary: Various astrophysical methods are used to detect possible deviations from General Relativity in this work. A class of f(R) gravity models, selected by the existence of Noether symmetries, is considered. The study determines static and spherically symmetric black hole solutions that encompass small departures from the Schwarzschild geometry. The proposed strategy of using ray-tracing technique and considering the Poynting-Robertson effect proves to be robust and efficient in investigating gravity and detecting small deviations from General Relativity.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Salvatore Capozziello, Vittorio De Falco, Carmen Ferrara
Summary: In the context of metric-affine gravity, the role of the boundary term in Symmetric Teleparallel Gravity is examined in f(Q,B) models. The field equations are derived and compared to those of f(Q) gravity in the limit of B approaching 0, revealing the dynamic equivalence between f(Q,B) and f(R) gravity. Conservation laws are also obtained. Considering boundary terms in f(Q) gravity represents the final ingredient for the Extended Geometric Trinity of Gravity, allowing for a unified treatment of f(R), f(T,(B) over tilde), and f(Q,B).
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Quantum Science & Technology
Carlo Altucci, Francesco Bajardi, Andrea Basti, Nicolo Beverini, Giorgio Carelli, Salvatore Capozziello, Simone Castellano, Donatella Ciampini, Fabrizio Davi, Francesco dell'Isola, Gaetano De Luca, Roberto Devoti, Giuseppe Di Somma, Angela D. V. Di Virgilio, Francesco Fuso, Ivan Giorgio, Aladino Govoni, Enrico Maccioni, Paolo Marsili, Antonello Ortolan, Alberto Porzio, Matteo Luca Ruggiero, Raffaele Velotta
Summary: The GINGER project aims to construct an array of three large frame ring laser gyroscopes with high sensitivity to measure angular velocity with respect to the fixed stars and provide geophysical investigation data.
AVS QUANTUM SCIENCE
(2023)
