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Astronomy & Astrophysics
Zhiqi Huang
Summary: The study focuses on constructing thawing k-essence models by generating Taylor expansion coefficients of L(0, X) from random matrices and selecting dark energy candidates based on assumptions of negative pressure and non-growth of subhorizon inhomogeneities. The distribution of thawing k-essence dark models in the (w0, wa) space is highly nonuniform, with approximately 90% clustering near a slow-roll line.
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Astronomy & Astrophysics
Bohai Chen, Yabo Wu, Jianan Chi, Wenzhong Liu, Yiliang Hu
Summary: This work investigates two kinds of k-essence dark energy models within the framework of loop quantum cosmology (LQC). The study analyzes the dynamical stability of critical points in each model and calculates cosmological quantities at each critical point. Comparison with classical Einstein cosmology (EC) shows that loop quantum gravity effects are significant in the early universe but diminish in the late-time universe. The effects of interaction on the universe evolution are also discussed. Bouncing universe is achieved in both models with loop quantum gravity effects, helping to avoid singularities. However, the interaction has little effect on bounce, though it affects the stability of some critical points.
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Physics, Multidisciplinary
S. H. Shekh
Summary: This analysis investigates the properties of homogeneous and isotropic FLRW space-time in the context of modified gravity with an interacting matter and Renyi holographic dark energy model. The study focuses on the time-redshift relation and energy conditions for cosmological models. The results show that the current accelerated expansion of the universe violates the strong energy condition while satisfying other energy conditions.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. H. Shekh
Summary: This study dedicates to the dynamical investigation of models of holographic dark energy using FLRW cosmological model in the context of modified gravity, where the Lagrangian is the arbitrary function of the trace of the non-metricity tensor Q in f(Q) gravity. It discusses the features of the derived cosmological model in terms of the relation between cosmic time and redshift, as well as the evolution trajectories of the equation of state parameter and stability parameters in the evolving universe. The classification of the field equations towards f(Q) = Q + mQ(n) reveals that the model is purely accelerating corresponds to 0 <= q <= -1.
PHYSICS OF THE DARK UNIVERSE
(2021)
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
Astronomy & Astrophysics
Andronikos Paliathanasis
Summary: In this study, we investigated the dynamical effects of the non-coincidence gauge on geometric dark energy within the framework of (Q)-gravity. The selection of the appropriate connection was found to significantly impact the cosmological dynamics. We also identified a non-coincidence connection for certain f(Q) models that can reconstruct the cosmological history and support different epochs.
GENERAL RELATIVITY AND GRAVITATION
(2023)
Article
Multidisciplinary Sciences
Salim Harun Shekh, Nurgissa Myrzakulov, Anirudh Pradhan, Assem Mussatayeva
Summary: In this study, the authors work on the parametrization approach towards Hubble's parameter in the frame of modified teleparallel Gauss-Bonnet gravity. They investigate the cosmological history from early-time inflation to late-time acceleration expansion using the torsion invariant T and the teleparallel equivalent of the Gauss-Bonnet term T-G. A transition scenario from a decelerating phase to an accelerating phase of cosmic evolution has been detected.
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Astronomy & Astrophysics
Alexander B. Balakin, Alexei S. Ilin
Summary: We propose a new self-consistent model that couples cosmic dark energy and dark matter using the rheological approach. This model represents the equations of state as integral operators of the Volterra type. We classify the exact solutions of the model based on the roots of the characteristic polynomial. The pressure, energy density, Hubble function, and acceleration parameter of dark energy and dark matter are expressed explicitly as functions of the dimensionless scale factor. We discuss two intriguing cosmological solutions that describe superexponential expansion and symmetric bounce, as well as new solutions corresponding to quasiperiodic behavior.
Review
Astronomy & Astrophysics
Veronica Motta, Miguel A. Garcia-Aspeitia, Alberto Hernandez-Almada, Juan Magana, Tomas Verdugo
Summary: The article summarizes the characteristics of dark energy models and some commonly used cosmological samples, discusses how to constrain model parameters using observational data, and finally provides an overview of the status of dark energy modeling.
Article
Astronomy & Astrophysics
George Lazarides, Rinku Maji, Rishav Roshan, Qaisar Shafi
Summary: Inspired by the recent determination of the W-boson mass, this study revisits an SO(10) axion model and finds that a scalar SU(2)(L) triplet field can significantly contribute to the W mass, thereby resolving the discrepancy between the Standard Model prediction and the experimental measurement. The model also satisfies gauge coupling unification and observable proton decay, and predicts the existence of axion and stable intermediate mass fermion as dark matter candidates. Furthermore, the model predicts the gravitational wave spectrum from topologically stable cosmic strings.
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Astronomy & Astrophysics
Umesh Kumar Sharma, Mukesh Kumar, Gunjan Varshney
Summary: This research investigates Barrow holographic dark energy with an energy density of ρλ=CH2-δ, considering the Hubble horizon as the IR cut-off in the f(R,T) gravity framework. The study shows that under certain limitations, Barrow holographic quintessence, k-essence, and dilation scalar field models can achieve accelerated expansion.
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Physics, Multidisciplinary
Ahmad Sheykhi, Maral Sahebi Hamedan
Summary: The thermodynamics-gravity conjecture suggests a strong connection between the gravitational field equations and the first law of thermodynamics, meaning any changes in entropy expression directly impact the field equations. By considering the modified Barrow entropy associated with the apparent horizon, the Friedmann equations are altered as well. This paper explores the implications of this modification on the holographic dark energy (HDE) model, highlighting changes in energy density and the Friedmann equations. The study also investigates the cosmological consequences of using the Hubble horizon and future event horizon as infrared cutoffs, including interactions between dark matter (DM) and dark energy (DE), and the impact of the Barrow exponent on the cosmological behavior of HDE, such as crossing the phantom line and shifting the universe phase transition time.
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Physics, Multidisciplinary
Gunjan Varshney, Umesh Kumar Sharma, Anirudh Pradhan, Narendra Kumar
Summary: This study examines the relationship between Tsallis holographic dark energy and various scalar field models in the context of f(R, T) gravity, revealing that under certain constraints, accelerated expansion can be achieved in the framework of f(R, T) gravity.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Mathematical
Mukesh Kumar, Ambuj Kumar Mishra
Summary: This paper investigates the application of Barrow holographic dark energy (BHDE) in the framework of Bianchi-I anisotropic model, considering hybrid expansion law (HEL). Various cosmological parameters are examined to support the current accelerated expansion of the Universe. The evolution of scalar field potential is also reconstructed to reconcile BHDE, with the use of K-essence for the study.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
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)
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Astronomy & Astrophysics
Martiros Khurshudyan, Amalya Khurshudyan, Ratbay Myrzakulov
ASTROPHYSICS AND SPACE SCIENCE
(2015)
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Astronomy & Astrophysics
Shynaray Myrzakul, Ratbay Myrzakulov, Lorenzo Sebastiani
ASTROPHYSICS AND SPACE SCIENCE
(2015)
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Astronomy & Astrophysics
Davood Momeni, Ratbay Myrzakulov
ASTROPHYSICS AND SPACE SCIENCE
(2015)
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Physics, Particles & Fields
Shynaray Myrzakul, Ratbay Myrzakulov, Lorenzo Sebastiani
EUROPEAN PHYSICAL JOURNAL C
(2015)
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Physics, Particles & Fields
R. Myrzakulov, L. Sebastiani, S. Vagnozzi
EUROPEAN PHYSICAL JOURNAL C
(2015)
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Astronomy & Astrophysics
R. Myrzakulov, M. Shahalam
GENERAL RELATIVITY AND GRAVITATION
(2015)
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Astronomy & Astrophysics
Ratbay Myrzakulov, Lorenzo Sebastiani
GENERAL RELATIVITY AND GRAVITATION
(2015)
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Physics, Mathematical
Davood Momeni, Surajit Chattopadhyay, Ratbay Myrzakulov
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2015)
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Physics, Mathematical
D. Momeni, R. Myrzakulov
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2015)
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Astronomy & Astrophysics
Sarita Rani, A. Altaibayeva, M. Shahalam, J. K. Singh, R. Myrzakulov
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2015)
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Physics, Multidisciplinary
Tanwi Bandyopadhyay, Ujjal Debnath, Mubasher Jamil, Faiz-ur-Rahman, Ratbay Myrzakulov
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2015)
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Physics, Multidisciplinary
Mubasher Jamil, Davood Momeni, Ratbay Myrzakulov
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2015)
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Physics, Multidisciplinary
Antonio Pasqua, Surajit Chattopadhyay, Martiros Khurshudyan, Ratbay Myrzakulov, Margarit Hakobyan, Artashes Movsisyan
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2015)
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Physics, Multidisciplinary
M. Khurshudyan, N. S. Mazhari, D. Momeni, R. Myrzakulov, M. Raza
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2015)
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Physics, Multidisciplinary
H. Gholizade, A. Altaibayeva, R. Myrzakulov
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2015)