Article
Astronomy & Astrophysics
Pankaj, Bramha Dutta Pandey, P. Suresh Kumar, Umesh Kumar Sharma
Summary: This paper presents a model for studying the nature of dark energy using nonextensive Tsallis entropy. The model is based on the Karolyhazy relation, which combines ideas from quantum physics and general relativity. The agegraphic dark energy (ADE) models are proposed to explain the energy density of quantum fluctuations in spacetime. The study examines the cosmological implications of the hypothesized dark energy model, considering the expansion of the universe and the flow of energy between the dark matter and dark energy sectors.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2022)
Article
Astronomy & Astrophysics
A. Sheykhi, S. Ghaffari
Summary: In this study, the agegraphic dark energy (ADE) model is revisited, taking into account the entropy associated with the apparent horizon in the form of Barrow entropy. The modified model can successfully describe the transition from the early decelerated phase to the late-time accelerated phase in cosmology, and the evolution of cosmological parameters can be influenced by adjusting the Barrow exponent delta.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
Y. Sobhanbabu, M. Vijaya Santhi
Summary: This study examines the dark energy phenomenon by studying the New Agegraphic Dark Energy (NADE) and Dark Matter (DM) within the framework of Brans-Dicke scalar tensor theory of gravitation. The viable deceleration parameter and cosmological parameters are considered to investigate the physical debate and stability of the models. Graphical presentations are used for analysis.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Umesh Kumar Sharma, Gunjan Varshney, Vipin Chandra Dubey
Summary: The study introduces a new dark energy model based on Barrow entropy and the holographic principle, using a time scale as an IR cut-off. By analyzing conformal time and the universe's age as infrared cut-offs, the cosmological significance of the suggested DE models is explored. The proposed models exhibit adequate nature in terms of equation of state, deceleration, and density parameters, potentially explaining late-time acceleration.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2021)
Article
Astronomy & Astrophysics
Pameli Saha, Sayani Maity, Ujjal Debnath
Summary: This study investigates the newly approached extended f(P) cubic gravity in a cosmological background. Different types of dark energy candidates are examined and their cosmological nature is analyzed. Reconstructions of f(P) gravity models are studied based on various dark energy candidates, and their trajectories and stability conditions are analyzed.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
Shikha Srivastava, Umesh Sharma, Vipin Dubey
Summary: The study investigates the interaction of the newly proposed Tsallis agegraphic dark energy model in a flat FLRW Universe, showing a phase transition from decelerated to accelerated phase and diverse behavior in the EoS parameter depending on the interaction. The evolutionary trajectories and planes of statefinder parameters reveal quintessence and Chaplygin gas behavior for different interaction parameters.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Article
Physics, Mathematical
Ajitesh Kumar, Vandna Srivastava, Vipin Chandra Dubey, Umesh Kumar Sharma
Summary: By utilizing a Barrow entropy and the standard holographic method within a cosmic framework, we propose the Barrow agegraphic dark energy (BADE) model which incorporates the Universe age as an infrared cutoff scale in a flat FLRW Universe. The trajectories of the BADE model have been plotted in the (r,s) and (r,q) planes, revealing that the model exhibits characteristics of both Chaplygin gas and quintessence for various values of delta. Additionally, we examined the BADE model without interaction in the (omega(D),omega'(D)) plane, utilizing the observational data from Planck 2018 results for VI-lambda CDM and obtaining a dynamic study with the energy density BADE parameter omega(0)(D) = 0.70 and H-0 = 67.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Song Li, Yun Chen
Summary: In this study, a cosmological model within the framework of the Einstein-Cartan theory is considered. The corresponding relation between the torsion field and holographic dark energy is analyzed, revealing its behavior as quintessence or quintom dark energy. Stability analysis shows that the model is classically stable for c<1. The statefinder parameters also indicate a phase transition from deceleration to acceleration in the universe. The fitting with Type Ia supernovae samples confirms the compatibility of the model with the latest observations.
Article
Astronomy & Astrophysics
Pinki, Pankaj Kumar
Summary: In this study, we propose a cosmological model in the framework of Brans-Dicke theory of gravity, considering the interaction between new agegraphic dark energy and dark matter with a sign changeable interaction term. We find the cosmological parameters such as the equation of state parameter and deceleration parameter by assuming the logarithmic form of Brans-Dicke scalar field. The analysis shows that the behavior of the equation of state parameter and the deceleration parameter depends on the values of model parameters, with the possibility of resembling a cosmological constant in the future. Furthermore, we explore the physical significance of cosmological planes and statefinder diagnostic for our model.
GENERAL RELATIVITY AND GRAVITATION
(2023)
Article
Astronomy & Astrophysics
H. R. Fazlollahi
Summary: In this paper, we extend the agegraphic dark energy model through quantum loop-correction and investigate its evolution and properties under different scenarios. Our findings show that the model is stable classically for non-interaction scenarios, while it exhibits inflation-like behavior for interaction scenarios.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Multidisciplinary Sciences
Giuseppe Gaetano Luciano, Yang Liu
Summary: This paper investigates the correspondence between the tachyon dark energy model and Barrow holographic dark energy. The dynamics of the tachyon scalar field T in a curved Friedmann-Robertson-Walker universe are reconstructed, both with and without interactions between dark energy and matter. The study shows that the tachyon field exhibits non-trivial dynamics, with different behaviors in flat and non-flat universes.
Article
Physics, Multidisciplinary
Andres Felipe Estupinan Salamanca, Sergio Bravo Medina, Marek Nowakowski, Davide Batic
Summary: This paper explores several non-flat universe models, including the standard cosmological scenario, Einstein-Cartan cosmology, Milne-McCrea universe with quantum corrections, and a non-flat universe with bulk viscosity. By employing various techniques, the study delves into the initial cosmological singularity, revealing the existence of nonsingular universes, such as the possibility of a static, non-expanding and stable Einstein universe.
Article
Astronomy & Astrophysics
Zahra Feizi Mangoudehi
Summary: The purpose of this paper is to study the Tsallis agegraphic dark energy with an interaction term between dark energy and dark matter in the DGP brane-world scenario. The analysis shows that the model exhibits a phase transition from deceleration to acceleration. The graphs of omega(DE) show phantom behavior, while omega(tot) exhibits both quintessence and phantom during the evolution of the Universe. The Statefinder analysis reveals quintessence behavior in the past and present, but tends towards the Lambda CDM in the future.
ASTROPHYSICS AND SPACE SCIENCE
(2022)
Article
Astronomy & Astrophysics
G. G. Luciano, J. Gine
Summary: In this paper, we construct a generalized interacting model of Barrow Holographic Dark Energy (BHDE) with the infrared cutoff given by the Hubble horizon. We analyze the cosmological evolution of a flat Friedmann-Lemaitre-Robertson-Walker Universe filled with pressureless dark matter, BHDE, and radiation fluid. The interaction between the dark sectors is assumed to be of non-gravitational origin and satisfying the second law of thermodynamics and Le Chatelier-Braun principle. We study various model parameters and investigate the growth rate of matter fluctuations in the linear regime, showing that our model is consistent with current observations and provides a suitable candidate to describe dark energy. We also explore the thermodynamics of our framework, with a focus on the validity of the generalized second law.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
Maria Tsedrik, Chiara Moretti, Pedro Carrilho, Federico Rizzo, Alkistis Pourtsidou
Summary: Interacting dark energy models are suggested as alternatives to the standard cosmological model, A CDM. We focus on a class of dark scattering models characterized by pure momentum exchange between dark energy and dark matter. This model extends the parameter space with two parameters, w and A, defining the dark energy equation of state and the coupling strength.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Quantum Science & Technology
H. Dolatkhah, S. Haseli, S. Salimi, A. S. Khorashad
QUANTUM INFORMATION PROCESSING
(2019)
Article
Optics
S. Haseli, H. Dolatkhah, S. Salimi, A. S. Khorashad
LASER PHYSICS LETTERS
(2019)
Article
Quantum Science & Technology
N. Awasthi, S. Haseli, U. C. Johri, S. Salimi, H. Dolatkhah, A. S. Khorashad
QUANTUM INFORMATION PROCESSING
(2020)
Article
Astronomy & Astrophysics
Saeid Karimi, Kayoomars Karami
ASTROPHYSICS AND SPACE SCIENCE
(2020)
Article
Optics
S. Haseli, H. Dolatkhah, H. Rangani Jahromi, S. Salimi, A. S. Khorashad
OPTICS COMMUNICATIONS
(2020)
Article
Multidisciplinary Sciences
H. Dolatkhah, S. Salimi, A. S. Khorashad, S. Haseli
SCIENTIFIC REPORTS
(2020)
Article
Astronomy & Astrophysics
S. Haseli, S. Salimi, H. Dolatkhah, A. S. Khorashad
Summary: In the presence of disturbance in an environment, the interaction of the first quantum system with the environment affects the dynamics of the second quantum system, leading to a reduction in the quantum speed limit time.
MODERN PHYSICS LETTERS A
(2021)
Article
Multidisciplinary Sciences
B. Ahmadi, S. Salimi, A. S. Khorashad
Summary: The second law of classical equilibrium thermodynamics states that any process occurs with the loss of information and irreversibility, however, in quantum processes fluctuations may lead to negative entropy production, where heat flows from a cold system to a hot system and information flows back into the system. This apparent violation of the Second Law can be resolved by explicitly incorporating information into the law and describing negative and positive entropy production with a quantum thermodynamic force.
SCIENTIFIC REPORTS
(2021)
Article
Astronomy & Astrophysics
Mohammad Sadeghi, Karam Bahari, Kayoomars Karami
Summary: In this paper, kink and sausage oscillations in the presence of longitudinal background flow were studied, with a focus on resonance absorption under magnetic pore conditions. The dispersion relation was determined and solved numerically to find frequencies and damping rates of the slow surface modes. It was shown that resonance absorption in the presence of plasma flow can lead to strong damping for forward waves while reducing the efficiency of damping for backward waves.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Zeinab Teimoori, Kazem Rezazadeh, Kayoomars Karami
Summary: This study investigates the formation of primordial black holes (PBHs) as a possible candidate for dark matter, utilizing a gravitationally enhanced friction mechanism. By considering a nonminimal derivative coupling between the scalar field and gravity, three parameter sets were identified that resulted in ultra slow-roll inflation, leading to the formation of PBHs. The model also predicts the presence of secondary gravitational waves (GWs) at frequencies within the sensitivity region of certain GW detectors, allowing for observational compatibility assessment.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Mohammad Sadeghi, Karam Bahari, Kayoomars Karami
Summary: Observations indicate the existence of twisted magnetic flux tubes and plasma flow in the solar atmosphere. The goal of this study is to determine the damping rate of sausage modes in the presence of magnetic twist and plasma flow. By numerically solving the dispersion relation for sausage modes in a non-uniform layer with magnetic pores under the condition of slow continuity, we find that the effect of twisted magnetic field on resonance absorption is greater for low speed plasma flow than for high speed.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
S. Amiri, K. Karami, Z. Ebrahimi
Summary: This paper evaluates the effects of inclination and asymmetry of solar coronal loops on kink magnetohydrodynamic oscillations. It is found that the frequencies and damping rates of the oscillations are smaller in inclined and asymmetric loops compared to uninclined loops. The ratios of mode frequency to damping rate remain unchanged approximately regardless of inclination or asymmetry, and these ratios can reliably infer the physical parameters of coronal loops and medium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Multidisciplinary
K. Rezazadeh, S. Asadzadeh, K. Fahimi, K. Karami, A. Mehrabi
Article
Optics
H. Dolatkhah, S. Haseli, S. Salimi, A. S. Khorashad
Article
Astronomy & Astrophysics
Zanyar Ebrahimi, Roberto Soler, Kayoomars Karami
ASTROPHYSICAL JOURNAL
(2020)
