Article
Astronomy & Astrophysics
Daris Samart, Bhuddhanubhap Silasan, Phongpichit Channuie
Summary: This study investigates the dynamics of interacting dark energy and dark matter in viable models of f(R) gravity using a standard framework of dynamical system analysis. The results show that in models with this interaction, the dynamical profiles of the Universe in viable f(R) dark energy models are modified by the interaction term and relevant model parameters. Additionally, the correct cosmological evolution with additional constraint parameter, alpha, from the interacting dark energy is obtained.
Article
Astronomy & Astrophysics
Goutam Mandal, Sujay Kr Biswas
Summary: The study investigates an interacting dark energy model in the context of Lyra's geometry, using a quintessence scalar field as the dark energy candidate and considering the evolution of dark matter mass with time. Dynamical systems analysis is used to study the cosmological evolution equations, revealing physically interesting results such as scalar field-dominated attractors and dark energy-dark matter scaling solutions.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2022)
Article
Physics, Particles & Fields
Patrocinio Perez, Ulises Nucamendi, Roberto De Arcia
Summary: The study applies dynamical system theory tools to examine the structure of a non-gravitational interaction between pressureless dark matter and dark energy described by a scalar field phi. It derives a coupling function that is linearly dependent on dark matter density and the kinetic term of the scalar field, and analyzes various scenarios to understand cosmological evolution. A notable finding is the emergence of a separatrix for alpha not equal to 0, which significantly modifies the phase space structure, a novel feature not previously mentioned in the literature.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
V. C. Tavares, C. J. A. P. Martins
Summary: The study concludes that the potential in these models needs to be extremely flat, and the dark energy equation of state deviates within 95.4% confidence levels for the rolling tachyon and Chaplygin components.
Article
Astronomy & Astrophysics
Mark S. Linton, Robert Crittenden, Alkistis Pourtsidou
Summary: We investigated two models of interacting dark energy that only interact through momentum exchange. Global fitting of cosmological parameters showed that these models are competitive with ACDM.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Yun Liu, Shihong Liao, Xiangkun Liu, Jiajun Zhang, Rui An, Zuhui Fan
Summary: The interacting dark energy (IDE) model provides a natural mechanism to address the coincidence problem and relieve observational tensions under the ΛCDM model. However, current observational data are insufficient to effectively distinguish IDE models from ΛCDM, and additional information from non-linear structure formation is needed. For the model with dark matter decaying into dark energy, the structure formation is slowed down and the properties of dark matter haloes are inconsistent with observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Particles & Fields
Saikat Chakraborty, Esteban Gonzalez, Genly Leon, Bin Wang
Summary: This paper studies a cosmological model inspired by axionic matter, involving two scalar fields interacting through a added potential term. By introducing new variables and a dimensionless time scale, the resulting dynamics are explored. The analysis of oscillations using methods from the theory of averaging nonlinear systems is motivated by difficulties in standard approaches, ultimately proving the consistency of time-dependent systems and their time-averaged counterparts in late-time dynamics.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Nandan Roy, Sangita Goswami, Sudipta Das
Summary: This study proposes a simple parametrization scheme for the Hubble parameter that can be applied to scalar field dark energy models. The proposed scheme allows for the incorporation of both quintessence and phantom scalar field, and provides cosmological parameters independent of the nature of the scalar field. The study finds that observational data prefers the equation of state for dark energy to be in the phantom domain.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Yu Zhao, Yun Liu, Shihong Liao, Jiajun Zhang, Xiangkun Liu, Wei Du
Summary: The interacting dark energy (IDE) model is a promising alternative cosmological model that considers the interaction between dark matter and dark energy, aiming to solve the fine-tuning and coincidence problems. Through cosmological N-body simulations, this study demonstrates that the halo concentration-mass (c-M) relation is a sensitive indicator of the interaction strength parameter ξ(2), particularly at lower redshifts. Parametrized formulae are constructed to quantify the dependence of the c-M relation on ξ(2), providing a theoretical tool for constraining ξ(2) with observational data. By utilizing various observational data, a tight constraint on ξ(2) of 0.071 ± 0.034 is obtained, showcasing the power of the halo c-M relation as a probe for the IDE model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Particles & Fields
Jackie C. H. Liu
Summary: Based on the ratio gravity theory, we propose a mechanism to generate dynamical dark energy by coupling gravity with a quintessence field. This model leads to different behaviors of dark energy in the early and late universe, with the quintessence field starting as a constant and oscillating as the universe expands.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Multidisciplinary Sciences
Cosmin Andrei, Anna Ijjas, Paul J. Steinhardt
Summary: In this paper, we investigate how short the remaining period of expansion can be given current observational constraints on dark energy, and discuss how this scenario fits naturally with cyclic cosmologies and recent conjectures about quantum gravity.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Astronomy & Astrophysics
Amine Bouali, Imanol Albarran, Mariam Bouhmadi-Lopez, Ahmed Errahmani, Taoufik Ouali
Summary: This paper examines the interaction between three phantom dark energy models, investigating their impact on cosmological parameters and the presence of singularities and abrupt events. The study focuses on distinguishing these models based on their equations of state and explores the potential of interactions between cold dark matter and dark energy to address issues in standard cosmology. Through the use of a MCMC approach, the cosmological parameters of each model are constrained, and comparisons are made using the corrected AIC(c) tool. The perturbative analysis of phantom DE models based on best fit background parameters is also conducted.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Physics, Multidisciplinary
Juerg Froehlich
Summary: This article presents a unified model of "dark matter" and discusses its implications for the late-time evolution of the universe and the matter-antimatter asymmetry.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Astronomy & Astrophysics
Diego Alvarez-Ortega, Gonzalo J. Olmo, Diego Rubiera-Garcia, Diego Saez-Chillon Gomez
Summary: Interacting dark-energy-dark-matter models have been analyzed in an attempt to find traces of new physics. The study shows that by introducing an appropriate coupling, dark-matter observers can see a non beginning, non ending universe, and this type of coupling can fit observational data.
Article
Physics, Particles & Fields
Oem Trivedi, Maxim Khlopov
Summary: The study of the true nature of dark energy is an exciting topic in cosmology. In this work, the authors investigate the existence of finite time singularities in scalar field dark energy models based on the RS-II Braneworld. The results show that these models can exhibit various types of singularities under certain initial conditions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan, Shin'ichi Nojiri
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2019)
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2019)
Article
Physics, Particles & Fields
Muhsin Aljaf, Daniele Gregoris, Martiros Khurshudyan
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Astronomy & Astrophysics
Chunlong Li, Xin Ren, Martiros Khurshudyan, Yi-Fu cai
Article
Physics, Particles & Fields
Emilio Elizalde, Martiros Khurshudyan
Summary: Constraints on a dark energy dominated Universe are obtained through an interplay of Bayesian (Probabilistic) Machine Learning and string Swampland criteria. Field traverse based Bayesian (Probabilistic) Learning approach applied to toy models allows estimation of high-redshift behavior affecting low-redshift one and potential development of new dark energy models. A hint of tension between string Swampland criteria and observations, along with a spontaneous sign switch phenomenon in the dark energy equation of state parameter, require further analysis.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Multidisciplinary Sciences
Martiros Khurshudyan, Ratbay Myrzakulov
Summary: This paper investigates new cosmological models where dark energy is a varying Chaplygin gas, discussing the impact of non-linear equations of state and non-gravitational interactions on the models. The use of phase space analysis and Bayesian Machine Learning techniques helps understand the late-time behavior of the models and constraints on free parameters, providing insights into which models may be ruled out. However, the study suggests that these models are unable to solve the H-0 tension problem based on simulated expansion rate data.
Article
Physics, Particles & Fields
Muhsin Aljaf, Daniele Gregoris, Martiros Khurshudyan
Summary: In this paper, the redshift evolution of the Hubble function is reconstructed using Gaussian process techniques to estimate parameters for Friedmann cosmological models with modified Chaplygin gas interacting with dark matter. The expansion history of the Universe is investigated using passively evolving galaxies as cosmic chronometers. Estimates for present-day values of various parameters, including the deceleration parameter and dark energy properties, are provided. The study shows that the cosmic chronometers data support cold dark matter and are in agreement with the Le Chatelier-Braun principle that dark energy should decay into dark matter.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Koblandy Yerzhanov, Shynaray Myrzakul, Duman Kenzhalin, Martiros Khurshudyan
Summary: The phase space analysis is used to investigate the accelerated expansion of the Universe due to the interaction between dark energy and cold dark matter. A specific two-parameter model is proposed to unify the properties of dark energy and dark matter, with previous studies showing potential explanations without interaction. The comparison with observational data and the exploration of future singularities are subjects left for future research.
MODERN PHYSICS LETTERS A
(2021)
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan
Summary: Bayesian (Probabilistic) Machine Learning is employed to investigate the opacity of the Universe and understand its implications through a generative process and constraints. The findings indicate that the Universe is not fully transparent and may have a significant impact on the H-0 tension problem.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Physics, Particles & Fields
Emilio Elizalde, Martiros Khurshudyan
Summary: A Gaussian Process is used to derive the Swampland criteria for f(R) modifications of GR, taking observational data into account. The results provide clean upper and lower limits for the criteria, allowing for an unbiased and natural assessment. The study investigates the possibility of efficiently alleviating the H-0 tension problem with different parameter choices.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Correction
Physics, Particles & Fields
Emilio Elizalde, Martiros Khurshudyan
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan, Sergei D. Odintsov, Ratbay Myrzakulov
Article
Astronomy & Astrophysics
Yi-Fu Cai, Martiros Khurshudyan, Emmanuel N. Saridakis
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan
Article
Astronomy & Astrophysics
Emilio Elizalde, Martiros Khurshudyan
