☆ 4.7 Article

Early evolution of fully convective stars in scalar-tensor gravity

EUROPEAN PHYSICAL JOURNAL C (2023)

Related references

Note: Only part of the references are listed.

Article Astronomy & Astrophysics

Fermi gas and modified gravity

Aneta Wojnar

Summary: The equations of state for Fermi gas in modified gravity are derived by maximizing the Fermi-Dirac entropy in both relativistic and nonrelativistic cases. It is shown that the microphysics of a physical system at a statistical state must depend on a specific theory of gravity in order to be consistently described.

PHYSICAL REVIEW D (2023)

Add to Collection

Article Astronomy & Astrophysics

Metric-affine effects in crystallization processes of white dwarfs

Surajit Kalita et al.

Summary: We analyze the effects of modified gravity on specific heats, Debye temperature, crystallization process, and cooling mechanism in white dwarfs. We derive the Lane-Emden-Chandra-sekhar equation and relate it to the cooling process equations for Palatini f(R) gravity. Moreover, for the first time in the literature, we show that the gravity model plays a crucial role not only in the mass and size of the white dwarf but also affects their internal properties. We further demonstrate that modified gravity can decrease the cooling age significantly.

PHYSICAL REVIEW D (2023)

Add to Collection

Article Astronomy & Astrophysics

Interiors of Terrestrial Planets in Metric-Affine Gravity

Aleksander Kozak et al.

Summary: Using a semiempirical approach, this study demonstrates that modified gravity has an impact on the internal properties of terrestrial planets, including their core, mantle, and core-mantle boundary. These findings are also applied to modeling a two-layer exoplanet under Palatini f(R) gravity.

UNIVERSE (2022)

Add to Collection

Article Astronomy & Astrophysics

Testing Screened Modified Gravity

Philippe Brax et al.

Summary: This article discusses the violation of known bounds on gravitation by long range scalar fields with a coupling to matter, and how this is evaded through screening mechanisms. It further explores how these mechanisms will be tested at different scales in laboratory and astrophysical and cosmological contexts.

UNIVERSE (2022)

Add to Collection

Article Physics, Multidisciplinary

Neutron stars in scalar-tensor gravity with quartic order scalar potential

S. D. Odintsov et al.

Summary: In this study, the effects of a non-minimally coupled quartic order scalar model on static neutron stars were investigated. The masses, radii, and other physical quantities of the neutron stars were obtained using numerical integration and compared with observational bounds. The results show that the WFF1 equation of state in the quartic order scalar model provides realistic results consistent with the observational event.

ANNALS OF PHYSICS (2022)

Add to Collection

Article Physics, Mathematical

Non-homogeneous exoplanets in metric-affine gravity

Aleksander Kozak et al.

Summary: This article provides an improved description of the planets' interior and examines the effects of modified gravity on Earth-like planets composed of iron core and silicate mantle.

INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS (2022)

Add to Collection

Article Astronomy & Astrophysics

Weak-field limit of f (R) gravity to unify peculiar white dwarfs

Surajit Kalita et al.

Summary: In recent years, there has been a growing interest in studying the sub- and super-Chandrasekhar limiting mass white dwarfs, which are potential candidates to produce different types of supernovae. Modifying Einstein's gravity theory with f(R) gravity seems to be one of the best choices to explain these peculiar white dwarfs. This paper derives the weak-field limit of f(R) gravity and uses it to study the structures of sub- and super-Chandrasekhar limiting mass white dwarfs.

PHYSICS LETTERS B (2022)

Add to Collection

Article Astronomy & Astrophysics

Searching for dark energy with the Sun

Ippocratis D. Saltas et al.

Summary: This article discusses general extensions of general relativity that predict a fifth force, which can be tested through precision tests on the solar equilibrium structure. The authors explain how different regions of the Sun can be used to test gravity and demonstrate that the fifth force leaves a signature on the solar sound speed. They also place constraints on the strength of the fifth-force coupling based on observational errors. The findings have significant implications for understanding the nature of gravity and can be applied to theories beyond general relativity.

ASTRONOMY & ASTROPHYSICS (2022)

Add to Collection

Article Astronomy & Astrophysics

Giant planet formation in Palatini gravity

Aneta Wojnar

Summary: The study focuses on the critical core mass and the conditions for a planet to possess a massive gaseous envelope around a solid core during early planetary formation.

PHYSICAL REVIEW D (2022)

Add to Collection

Article Physics, Particles & Fields

Pre-main sequence evolution of low-mass stars in Eddington-inspired Born-Infeld gravity

Merce Guerrero et al.

Summary: This study investigates three aspects of the early-evolutionary phases in low-mass stars within Eddington-inspired Born-Infeld (EiBI) gravity, including the Hayashi tracks, the minimum mass required for the main sequence, and the maximum mass for a fully convective star. The results show a dependence of these quantities on both the EiBI parameter and the star's central density.

EUROPEAN PHYSICAL JOURNAL C (2022)

Add to Collection

Article Astronomy & Astrophysics

Stability criterion for white dwarfs in Palatini f(R) gravity

Lupamudra Sarmah et al.

Summary: Recent observations suggest the violation of Chandrasekhar mass limit in supernovae and the existence of white dwarfs with super- and sub-Chandrasekhar limiting masses. In this study, we investigate these objects using Palatini f(R) gravity in the context of general relativistic extensions. We determine the limiting masses and dynamical instability criteria for white dwarfs in this gravitational theory. Furthermore, we demonstrate that the conventional positivity condition remains valid for stability in Palatini gravity.

PHYSICAL REVIEW D (2022)

Add to Collection

Article Physics, Multidisciplinary

Maximum baryon masses for static neutron stars in f(R) gravity

A. Astashenok et al.

Summary: This study investigates the upper mass limit predictions of baryonic mass for static neutron stars in the context of f (R) gravity, focusing on the R-2 gravity model. The results show that most equations of state studied have baryon masses near the lower limits of the mass gap region, with the highest maximum baryon mass found to be around 3 times the solar mass. The analysis suggests that the gravitational mass of static neutron stars cannot exceed three solar masses, while the lower mass limits of astrophysical black holes are likely to be in the range of 2.5-3 solar masses, supporting the claim that neutron stars cannot have gravitational masses larger than 3 solar masses in the context of R-2 gravity.

EPL (2021)

Add to Collection

Article Physics, Mathematical

White dwarf stars in modified gravity

Aneta Wojnar

Summary: Modified gravity framework may provide alternative explanations to white dwarfs' cooling processes, age determination, and Chandrasekhar mass limits. Additionally, the Chandrasekhar limit has been obtained from Palatini f(Script capital R) gravity introduced by a simple Lane-Emden model.

INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Equation of states in the curved spacetime of spherical degenerate stars

Golam Mortuza Hossain et al.

Summary: In the study of spherical degenerate stars, effects of general relativity and gravitational time dilation are crucial and ignoring them can lead to significantly underestimating the mass limits of these compact stars.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

White dwarfs and generalized uncertainty principle

I. H. Belfaqih et al.

Summary: This study investigates white dwarfs' mass and radius with three generalized uncertainty principle (GUP) models, finding that the quadratic GUP model is favored over the linear model. It is possible to obtain a higher mass limit in certain scenarios, and the linear-quadratic GUP model may allow for the formation of more massive stable white dwarfs.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D (2021)

Add to Collection

Article Astronomy & Astrophysics

Modified gravity in the interior of population II stars

Shaswata Chowdhury et al.

Summary: The study investigates the effects of modified gravity beyond Horndeski theory in the interior of a population II star, finding that reduced gravity may result in decreased luminosity and increased radius of the star, but some effects are reversed near the core. The model provides a constraint on the modified gravity parameter within its limitations.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Physics, Multidisciplinary

Exoplanets as Sub-GeV Dark Matter Detectors

Rebecca K. Leane et al.

Summary: Exoplanets are presented as new targets for discovering dark matter. Through estimating the sensitivity of upcoming infrared telescopes, actionable searches for discovering or excluding dark matter are found. Dark matter with masses above about an MeV can be probed with exoplanets, with scattering cross sections stronger than existing limits.

PHYSICAL REVIEW LETTERS (2021)

Add to Collection

Article Astronomy & Astrophysics

Causal limit of neutron star maximum mass in f(R) gravity in view of GW190814

A. V. Astashenok et al.

Summary: Investigated the causal limit of maximum mass for stars in the framework of f(R) gravity, numerically examining the combined effect of causal equation of state and sound speed on maximum mass of static neutron stars. This provides the most extreme upper bound for neutron star masses in extended gravity.

PHYSICS LETTERS B (2021)

Add to Collection

Article Astronomy & Astrophysics

Neutron stars phenomenology with scalar-tensor inflationary attractors

S. D. Odintsov et al.

Summary: This work examines the implications of a subclass of E-models cosmological attractors, known as a-attractors, on hydrodynamically stable slowly rotating neutron stars. By numerically solving the Tolman-Oppenheimer-Volkoff equations in the Einstein frame, the study finds that the masses and radii of neutron stars vary with the parameter a characterizing the a-attractors. Results indicate a complex relationship between non-minimal inflationary attractors and neutron star phenomenology in scalar-tensor theory.

PHYSICS OF THE DARK UNIVERSE (2021)

Add to Collection

Article Astronomy & Astrophysics

Universal inflationary attractors implications on static neutron stars

V. K. Oikonomou

Summary: This study focuses on static neutron stars within a specific class of non-minimally coupled inflationary potentials, known as universal attractors. The analysis reveals that all studied cases predict larger maximum masses for neutron stars and are consistent with the GW170817 constraints on neutron star radii.

CLASSICAL AND QUANTUM GRAVITY (2021)

Add to Collection

Article Physics, Multidisciplinary

Novel stellar astrophysics from extended gravity

A. Astashenok et al.

Summary: Novel implications on neutron stars come from extended gravity. Specifically, new research suggests the possibility of large mass stars in the mass gap region, which may require extensions of General Relativity to successfully describe this phenomenon and speculate on the largest allowed neutron star mass in a quantitative manner.

EPL (2021)

Add to Collection

Article Physics, Particles & Fields

Invariant quantities of scalar-tensor theories for stellar structure

Aleksander Kozak et al.

Summary: The translation introduces relativistic hydrostatic equilibrium equations for a wide class of gravitational theories possessing a scalar-tensor representation, showing that the stellar structure equations can be written with respect to the scalar-tensor invariants. This allows for interpreting their physical role.

EUROPEAN PHYSICAL JOURNAL C (2021)

Add to Collection

Article Astronomy & Astrophysics

Higher mass limits of neutron stars from the equation of states in curved spacetime

Golam Mortuza Hossain et al.

Summary: The equations of state for neutron stars should take into account the effect of gravitational time dilation, resulting in a higher mass limit due to the varying interior metric over the length scale of the star.

PHYSICAL REVIEW D (2021)

Add to Collection

Article Astronomy & Astrophysics

Jupiter and jovian exoplanets in Palatini f ((R)over-bar) gravity

Aneta Wojnar

Summary: Palatini f((R) over bar) gravity has been shown to impact certain parts of substellar evolution, such as fragmentation of a gaseous cloud and cooling of Jupiter-like planets. Simple models describing these processes demonstrate differences in opacity mass limit and cooling time of jovian planets in modified gravity.

PHYSICAL REVIEW D (2021)

Add to Collection

Article Astronomy & Astrophysics

Metric-affine gravity effects on terrestrial exoplanet profiles

Aleksander Kozak et al.

Summary: The mass-radius relations of homogeneous cold spheres made from six common solid materials found in terrestrial planets are discussed, along with an additional degeneracy in (exo)planet profiles and their properties derived from findings in Palatini f(R) gravity framework. Furthermore, a new test of gravity is proposed where seismic data from earthquakes and marsquakes can be used to test and constrain gravity models.

PHYSICAL REVIEW D (2021)

Add to Collection

Article Astronomy & Astrophysics

Cooling process of brown dwarfs in Palatini f(R) gravity

Maria Benito et al.

Summary: The study presents an analytical model for the evolution of brown dwarfs in quadratic Palatini f(R) gravity, improving on previous studies by incorporating a more realistic description of the partially degenerate state and considering the hydrogen metallic-molecular phase transition. The revised cooling process for substellar objects is also addressed in this improved model.

PHYSICAL REVIEW D (2021)

Add to Collection

Article Astronomy & Astrophysics

Lithium abundance is a gravitational model dependent quantity

Aneta Wojnar

Summary: The dependence of lithium abundance on modified gravity in low-mass stellar objects introduces potential uncertainties to age determination techniques if they rely on the light element depletion method.

PHYSICAL REVIEW D (2021)

Add to Collection

Article Astronomy & Astrophysics

Updating constraints on f(T) teleparallel cosmology and the consistency with big bang nucleosynthesis

Micol Benetti et al.

Summary: Researchers conducted a detailed study on viable f(T) teleparallel cosmological models, including power law, exponential, and square-root exponential, analyzing their evolution at different scales. Through a combination of measurements, they obtained narrow constraints on the free parameters of these models, indicating a preference for extended gravity models in observations.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Review Physics, Multidisciplinary

Stellar structure models in modified theories of gravity: Lessons and challenges

Gonzalo J. Olmo et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2020)

Add to Collection

Article Astronomy & Astrophysics

Extended gravity description for the GW190814 supermassive neutron star

A. Astashenok et al.

PHYSICS LETTERS B (2020)

Add to Collection

Article Astronomy & Astrophysics

Early evolutionary tracks of low-mass stellar objects in modified gravity

Aneta Wojnar

PHYSICAL REVIEW D (2020)

Add to Collection

Article Astronomy & Astrophysics

Modified gravity and the black hole mass gap

Maria C. Straight et al.

PHYSICAL REVIEW D (2020)

Add to Collection

Review Physics, Multidisciplinary

Horndeski theory and beyond: a review

Tsutomu Kobayashi

REPORTS ON PROGRESS IN PHYSICS (2019)

Add to Collection

Article Physics, Multidisciplinary

Obtaining Precision Constraints on Modified Gravity with Helioseismology

Ippocratis D. Saltas et al.

PHYSICAL REVIEW LETTERS (2019)

Add to Collection

Review Astronomy & Astrophysics

Dark energy and modified gravity in degenerate higher-order scalar-tensor (DHOST) theories: A review

David Langlois

INTERNATIONAL JOURNAL OF MODERN PHYSICS D (2019)

Add to Collection

Article Physics, Particles & Fields

Brown dwarfs in Eddington-inspired Born-Infeld and beyond Horndeski theories

A. S. Rosyadi et al.

EUROPEAN PHYSICAL JOURNAL C (2019)

Add to Collection

Article Physics, Particles & Fields

Constraining chameleon field driven warm inflation with Planck 2018 data

Haidar Sheikhahmadi et al.

EUROPEAN PHYSICAL JOURNAL C (2019)

Add to Collection

Article Astronomy & Astrophysics

Envelope Convection, Surface Magnetism, and Spots in A and Late B-type Stars

Matteo Cantiello et al.

ASTROPHYSICAL JOURNAL (2019)

Add to Collection

Article Astronomy & Astrophysics

Minimum main sequence mass in quadratic Palatini f(R) gravity

Gonzalo J. Olmo et al.

PHYSICAL REVIEW D (2019)

Add to Collection

Article Astronomy & Astrophysics

Self-lensing Discovery of a 0.2M⊙ White Dwarf in an Unusually Wide Orbit around a Sun-like Star

Kento Masuda et al.

ASTROPHYSICAL JOURNAL LETTERS (2019)

Add to Collection

Article Astronomy & Astrophysics

Vainshtein regime in scalar-tensor gravity: Constraints on degenerate higher-order scalar-tensor theories

Marco Crisostomi et al.

PHYSICAL REVIEW D (2019)

Add to Collection

Article Astronomy & Astrophysics

White dwarfs and revelations

Ippocratis D. Saltas et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2018)

Add to Collection

Article Astronomy & Astrophysics

Observable traces of non-metricity: New constraints on metric-affine gravity

Adria Delhom-Latorre et al.

PHYSICS LETTERS B (2018)

Add to Collection

Article Astronomy & Astrophysics

Gravitational wave decay into dark energy

Paolo Creminelli et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2018)

Add to Collection

Article Physics, Particles & Fields

Constraining f (T) teleparallel gravity by big bang nucleosynthesis f (T) cosmology and BBN

S. Capozziello et al.

EUROPEAN PHYSICAL JOURNAL C (2017)

Add to Collection

Article Astronomy & Astrophysics

Constraints on modified gravity models from white dwarfs

Srimanta Banerjee et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2017)

Add to Collection

Article Physics, Multidisciplinary

Dark Energy after GW170817 and GRB170817A

Paolo Creminelli et al.

PHYSICAL REVIEW LETTERS (2017)

Add to Collection

Article Physics, Multidisciplinary

Implications of the Neutron Star Merger GW170817 for Cosmological Scalar-Tensor Theories

Jeremy Sakstein et al.

PHYSICAL REVIEW LETTERS (2017)

Add to Collection

Article Physics, Multidisciplinary

Dark Energy After GW170817: Dead Ends and the Road Ahead

Jose Maria Ezquiaga et al.

PHYSICAL REVIEW LETTERS (2017)

Add to Collection

Article Astronomy & Astrophysics

Deceleration versus acceleration universe in different frames of F(R) gravity

Sebastian Bahamonde et al.

PHYSICS LETTERS B (2017)

Add to Collection

Review Physics, Multidisciplinary

Modified gravity theories on a nutshell: Inflation, bounce and late-time evolution

S. Nojiri et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2017)

Add to Collection

Article Physics, Particles & Fields

Interacting scalar tensor cosmology in light of SNeIa, CMB, BAO and OHD observational data sets

Sayed Wrya Rabiei et al.

EUROPEAN PHYSICAL JOURNAL C (2016)

Add to Collection

Article Astronomy & Astrophysics

Ostrogradsky in theories with multiple fields

Claudia de Rham et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2016)

Add to Collection

Article Astronomy & Astrophysics

Modified gravity inside astrophysical bodies

Ryo Saito et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2015)

Add to Collection

Article Astronomy & Astrophysics

Exploring gravitational theories beyond Horndeski

Jerome Gleyzes et al.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2015)

Add to Collection

Article Astronomy & Astrophysics

Astrophysical probes of the Vainshtein mechanism: Stars and galaxies

Kazuya Koyama et al.

PHYSICAL REVIEW D (2015)

Add to Collection

Article Physics, Multidisciplinary

Hydrogen Burning in Low Mass Stars Constrains Scalar-Tensor Theories of Gravity

Jeremy Sakstein

PHYSICAL REVIEW LETTERS (2015)

Add to Collection

Article Physics, Particles & Fields

Effect of Generalized Uncertainty Principle on Main-Sequence Stars and White Dwarfs

Mohamed Moussa

ADVANCES IN HIGH ENERGY PHYSICS (2015)

Add to Collection

Article Astronomy & Astrophysics

LINKING TESTS OF GRAVITY ON ALL SCALES: FROM THE STRONG-FIELD REGIME TO COSMOLOGY

Tessa Baker et al.

ASTROPHYSICAL JOURNAL (2015)

Add to Collection

Article Physics, Particles & Fields

The Confrontation between General Relativity and Experiment

Clifford M. Will

Living Reviews in Relativity (2014)

Add to Collection

Article Physics, Particles & Fields

Remnants of black rings from gravity's rainbow

Ahmed Farag Ali et al.

JOURNAL OF HIGH ENERGY PHYSICS (2014)

Add to Collection

Article Astronomy & Astrophysics

Modified gravity makes galaxies brighter

Anne-Christine Davis et al.

PHYSICAL REVIEW D (2012)

Add to Collection

Article Astronomy & Astrophysics

Jeans analysis of self-gravitating systems in f(R) gravity

S. Capozziello et al.

PHYSICAL REVIEW D (2012)

Add to Collection

Review Physics, Multidisciplinary

Modified gravity and cosmology

Timothy Clifton et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2012)

Add to Collection

Review Physics, Nuclear

The Primordial Lithium Problem

Brian D. Fields

ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, VOL 61 (2011)

Add to Collection

Article Astronomy & Astrophysics

Chameleon mechanism with a new potential

K. Saaidi et al.

ASTROPHYSICS AND SPACE SCIENCE (2011)

Add to Collection

Article Astronomy & Astrophysics

γ parameter and Solar System constraint in chameleon-Brans-Dicke theory

Kh. Saaidi et al.

PHYSICAL REVIEW D (2011)

Add to Collection

Review Physics, Multidisciplinary

Unified cosmic history in modified gravity: From F(R) theory to Lorentz non-invariant models

Shin'ichi Nojiri et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2011)

Add to Collection

Review Physics, Multidisciplinary

Extended Theories of Gravity

Salvatore Capozziello et al.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2011)

Add to Collection

Article Astronomy & Astrophysics

Galileon as a local modification of gravity

Alberto Nicolis et al.

PHYSICAL REVIEW D (2009)

Add to Collection

Review Astronomy & Astrophysics

The stellar halo of the Galaxy

Amina Helmi

ASTRONOMY AND ASTROPHYSICS REVIEW (2008)

Add to Collection

Article Astronomy & Astrophysics

Class of viable modified f(R) gravities describing inflation and the onset of accelerated expansion

G. Cognola et al.

PHYSICAL REVIEW D (2008)

Add to Collection

Review Astronomy & Astrophysics

Extended theories of gravity and their cosmological and astrophysical applications

Salvatore Capozziello et al.

GENERAL RELATIVITY AND GRAVITATION (2008)

Add to Collection

Article Astronomy & Astrophysics

Mass-radius relationships for solid exoplanets

S. Seager et al.

ASTROPHYSICAL JOURNAL (2007)

Add to Collection

Article Physics, Mathematical

Introduction to modified gravity and gravitational alternative for dark energy

Shin'ichi Nojiri et al.

INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS (2007)

Add to Collection

Review Astronomy & Astrophysics

Dynamics of dark energy

Edmund J. Copeland et al.

INTERNATIONAL JOURNAL OF MODERN PHYSICS D (2006)

Add to Collection

Article Astronomy & Astrophysics

Scalar-tensor-vector gravity theory

JW Moffat

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2006)

Add to Collection

Review Physics, Multidisciplinary

Astrophysics probes of particle physics

GG Raffelt

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2000)

Add to Collection

© Peeref 2019-2024. All rights reserved.