Article
Astronomy & Astrophysics
Ricardo G. Landim
Summary: This paper explores the interaction between holographic dark energy with the Hubble radius as an infrared cutoff and dark matter through the analysis of coupling constants. However, the obtained results significantly differ from the observed matter power spectrum, as well as the cosmic microwave background temperature and polarization power spectra.
Article
Physics, Mathematical
Pankaj, Nisha Muttathazhathu Ali, Umesh Kumar Sharma, P. Suresh Kumar, Shikha Srivastava
Summary: In this work, a new Tsallis holographic dark energy model with an apparent horizon as an infrared (IR) cutoff is constructed in a non-flat Friedmann-Lemaitre-Robertson-Walker Universe. The transition of the NTHDE Universe from a decelerating to an accelerating phase is described using the deceleration parameter and equation of state parameter with different values of the NTHDE parameter delta. The behavior of the equation of state parameter and the stability of the model are investigated using Hubble data sets and distance modulus measurements of Type Ia Supernovae.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Physics, Mathematical
Artyom Astashenok, Alexander S. Tepliakov
Summary: This paper investigates the Tsallis holographic dark energy model in the framework of Nojiri-Odintsov gravity. The results show that this model can describe observational data and has an oscillating Hubble parameter in the future. Additionally, the study reveals that the occurrence of singularities is associated with the zero second derivative of f(R).
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Physics, Particles & Fields
Antonella Cid, Carlos Rodriguez-Benites, Mauricio Cataldo, Gonzalo Casanova
Summary: In this study, a Bayesian model selection analysis was conducted on interacting scenarios of dark matter and modified holographic Ricci dark energy (MHRDE) with linear interacting terms. The results show moderate to strong evidence against all the MHRDE interacting scenarios studied compared to Lambda CDM, when the full joint analysis is considered.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Luis M. Sanchez, Hernando Quevedo
Summary: In this study, we investigate the relationship between gravity and thermodynamics in dynamic systems by considering the apparent horizon of the FLRW spacetime as a thermodynamic system. We derive the fundamental equation in the entropy representation and explore the consequences of satisfying classical laws of thermodynamics. Our investigation focuses on FLRW spacetimes with and without a cosmological constant. We find that the interpretation of the apparent horizon as an isolated thermodynamic system is only possible under certain conditions, as the analogy does not hold for all parameter values and the entire evolution of the horizon. However, we demonstrate that the generalized second law of thermodynamics remains valid.
Article
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.
Article
Astronomy & Astrophysics
Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul
Summary: In this study, the holographic cut-off in the formalism of generalized holographic dark energy (HDE) is generalized to depend on the particle horizon, future horizon, and scale factor of the universe. It is shown that the Barrow entropic dark energy (DE) model is equivalent to the generalized HDE, where the holographic cut-off is determined by the first-order derivative of the particle horizon or future horizon. The equivalence is extended to consider the variation of the Barrow entropy exponent with the cosmological expansion.
Article
Astronomy & Astrophysics
Shin'ichi Nojiri, Sergei D. Odintsov, Valerio Faraoni
Summary: We propose a new entropy construct that generalizes existing entropies and converges to known entropy in a specific limit. Applying this construct to Schwarzschild black hole and cosmology models, it is shown that it has the potential to describe inflation and/or holographic dark energy.
Article
Astronomy & Astrophysics
Zahra Feizi Mangoudehi
Summary: The study focuses on constraining the nonlinear interacting and noninteracting Tsallis holographic dark energy models using observational datasets, exploring parameters including the Hubble parameter, dark-energy equation of state, effective equation of state, and deceleration parameter. The research shows good consistency with observations and reveals turning points and stability.
ASTROPHYSICS AND SPACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Gargee Chakraborty, Surajit Chattopadhyay, Ertan Gudekli, Irina Radinschi
Summary: This study investigates the cosmological consequences and thermodynamics of Barrow holographic dark energy (HDE), incorporating viscosity and reconstructions of parameters associated with Barrow HDE. Observations of quintessence and quintom behavior, as well as the validity of the generalized second law of thermodynamics, are reported. The study demonstrates the physical viability of considering Barrow HDE as a specific case of NO HDE but concludes that the model is limited to being very close to ΛCDM and cannot go beyond it.
Article
Astronomy & Astrophysics
Abolhassan Mohammadi, Tayeb Golanbari, Kazuharu Bamba, Iarley P. Lobo
Summary: The application of holographic principle in early and late-time evolution, especially during inflation, shows that modifying entropy can result in changes in energy density. Through the use of Tsallis entropy and GO length scale, parameters of the model are calculated, establishing a correspondence between holographic dark energy and scalar field, and considering the trans-Planckian censorship conjecture.
Article
Physics, Mathematical
S. Mandal, A. Singh, R. Chaubey
Summary: In this paper, the dynamic evolution of the universe in the models of holographic dark energy with f(Q,T) gravity framework has been investigated. The findings suggest that the Renyi holographic dark energy model with GO cutoff satisfies the observational constraints on the equation of state (EoS) parameter at the present time compared to other models. Diagnostic tools such as Statefinders and Om diagnostic have been used to classify the dark energy evolution regions.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Nisha Muttathazhathu Ali, Pankaj, Umesh Kumar Sharma, P. Suresh Kumar, Ambuj Kumar Mishra
Summary: In this study, a new Tsallis holographic dark energy model is constructed in a non-flat universe, considering the effects of different parameter values on the expansion of the universe. By deriving the differential equations for the dark energy density parameter and the equation of state parameter, it is found that there are specific behaviors in both closed and open universes, and the phase transition from deceleration to acceleration can be observed through the evolution of the deceleration parameter. The study shows that the model matches well with Hubble data and exhibits stability.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
Aurelien Barrau
Summary: The holographic space-time approach to inflation provides a well-defined framework for studying the early universe, addressing fundamental questions and suggesting paths for observational confirmation.
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.