Article
Astronomy & Astrophysics
Eleonora Di Valentino, Olga Mena
Summary: This paper analyzes the constraints and potential hints obtained for models involving an interaction between the dark matter and dark energy sectors using simulated Planck data. The simulations suggest a potential fake detection for a non-zero interaction among the dark matter and dark energy fluids when dealing with current cosmic microwave background (CMB) Planck measurements alone. Future CMB observations, particularly cosmic variance limited polarization experiments, may provide more reliable cosmological constraints and break existing parameter degeneracies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Eleonora Di Valentino, Alessandro Melchiorri, Olga Mena, Supriya Pan, Weiqiang Yang
Summary: Recent measurements by the Planck satellite suggest a preference for a closed universe, but this conflicts with low redshift observables such as Type Ia supernovae luminosity distances. Interacting dark energy models could help reconcile these discrepancies in a closed Universe, indicating potential for a different coupling and curvature above 99% confidence level. This highlights the significance of broader cosmological data analyses and the possibility of better agreement between theory and observations by relaxing flatness and vacuum energy assumptions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Astronomy & Astrophysics
Albin Joseph, Rajib Saha
Summary: The next-generation CMB satellite missions can provide precise constraints on cosmological parameters. However, these constraints may weaken without attributing dark energy to a cosmological constant. Models involving interaction between dark energy and dark matter can alleviate the cosmic coincidence problem. In this study, the ability of future CMB and BAO experiments to constrain interacting dark energy models is tested, showing improved constraints when combined with additional data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
H. R. M. Zarandi, E. Ebrahimi
Summary: This paper discusses the cosmic age problem in the case of the ghost dark energy model and uses observational data to constrain the free parameter space of the models. It is found that in one case the age problem is completely resolved, while in the other two cases some constraints on the models are required. Additionally, other properties of these three models, such as the ability to cross the phantom line and the stability against cosmic perturbations, are investigated.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2022)
Article
Astronomy & Astrophysics
T. Harko, K. Asadi, H. Moshafi, H. Sheikhahmadi
Summary: This study investigates the effects of interaction, decay, and particle generation in a many-component Universe using an approach based on open system thermodynamics. By introducing particle number balance equations and creation pressures, the cosmological evolution equations are thermodynamically consistent. Constrained by multiple observational data sets, this model provides a solution to the Hubble tension problem.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Joseph P. Johnson, S. Shankaranarayanan
Summary: The study explores the interaction between dark energy and dark matter, finding a unique form of interaction strength and showing equivalence between fields and fluids in certain models. It also categorizes interacting dark energy models in the literature and introduces a novel autonomous system for stability analysis. The research demonstrates that the dark-energy-dominated epoch occurs earlier than noninteracting systems for specific scalar field potentials and coupling strengths.
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
Hassan Amirhashchi, Anil Kumar Yadav, Nafis Ahmad, Vikrant Yadav
Summary: This study presents observational constraints on the coupling between dark energy and dark matter in an anisotropic Bianchi type I universe. The findings suggest that there is no interaction between the dark components, indicating support for a model without interaction.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Keshav Ram Mishra, Shibesh Kumar Jas Pacif, Rajesh Kumar, Kazuharu Bamba
Summary: In this paper, an interacting dark energy model is studied by assuming gravitational interaction between matter fields and dark energy in a spatially homogeneous and isotropic Friedmann-Robertson-Walker space-time. The cosmic evolution is examined in the framework of an interacting scenario using a suitable ansatz for the scale factor parametrization of the Hubble parameter. The evolution of cosmological parameters, including deceleration parameter, energy density, pressure, and equation of state, is discussed in detail. Cosmological tests and analysis are performed to support the obtained interacting model. Additionally, the potential of the scalar field is reconstructed and the refined swampland conjecture is refuted using the equation of state and relationships between energy density, pressure, scalar field, and potential.
PHYSICS OF THE DARK UNIVERSE
(2023)
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
Astronomy & Astrophysics
Joseph P. Johnson, Archana Sangwan, S. Shankaranarayanan
Summary: In this study, we investigate an interacting field theory model for the interaction between dark energy and dark matter. By comparing with cosmological data, we find that this interacting model is consistent with observations and obtain quantitative tools to distinguish between interacting and non-interacting dark energy scenarios.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
R. Raushan, A. Singh
Summary: We investigate the flat-FRW model in the dynamical Chern-Simons gravity with interacting dark energy. The model yields late-time accelerating universe with decelerating past having matter, radiation and stiff matter dominated phases. The modification term of the Chern-Simons gravity gives a nontrivial impact on the cosmological evolution of universe in the model. The model possess an attractor corresponding to the accelerated expansion at late-times, compatible with the observations. The evolution of cosmological parameters like deceleration parameter, effective equation of state parameter, state-finder diagnostic analysis and classical stability of the model have been discussed in detail. We show that the model possesses decelerating past originating with stiff-matter like evolution, further evolving into radiation and/or matter dominated phases with late-time accelerating universe evolution as ultimate fate, on the basis of model parameter values. The model is classically stable in nature.
PHYSICS OF THE DARK UNIVERSE
(2023)
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
H. R. M. Zarandi, E. Ebrahimi
Summary: This paper studies the cosmic age problem in holographic and generalized ghost dark energy models, and finds that non-linear interactions can alleviate the age problem. By analyzing age tests and data sets, the study also discovers a new bound for a parameter and shows that the generalized ghost dark energy can completely alleviate the cosmic age problem.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Meng-Di Cao, Jie Zheng, Jing-Zhao Qi, Xin Zhang, Zong-Hong Zhu
Summary: This study proposes a method to simultaneously constrain H-0 and Omega(K) through strong gravitational lensing time-delay and gravitational wave data, achieving relatively accurate results in future cosmological model-independent measurements.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Shulei Ni, Yichao Li, Li-Yang Gao, Xin Zhang
Summary: In the intensity mapping survey of neutral hydrogen, foreground contamination and systematic effects caused by radio telescopes pose challenges in subtracting foreground. This study investigates the use of the 3D U-Net algorithm to mitigate these difficulties, particularly when considering the telescope's primary beam effect. The results demonstrate that the U-Net method, combined with the traditional PCA method, effectively removes foreground contamination, providing a promising approach for future experiments.
ASTROPHYSICAL JOURNAL
(2022)
Article
Physics, Nuclear
Peng-Ju Wu, Jing-Zhao Qi, Xin Zhang
Summary: Density decreases with an increase in thickness, and proper length of the shell steadily decreases. The energy of the shell increases towards the outer surface, indicating that the outer boundary is denser.
Article
Physics, Nuclear
Shang-Jie Jin, Shuang-Shuang Xing, Yue Shao, Jing-Fei Zhang, Xin Zhang
Summary: Gravitational waves can be used to explore the cosmic expansion history, and future multi-band gravitational wave standard siren data are expected to play a significant role in cosmological parameter estimation.
Article
Astronomy & Astrophysics
Peng-Ju Wu, Yue Shao, Shang-Jie Jin, Xin Zhang
Summary: In the next decades, it is necessary to develop new cosmological probes to accurately measure the Hubble constant and the equation of state of dark energy. This study shows that 21 cm intensity mapping, fast radio burst, gravitational wave standard siren, and strong gravitational lensing can be useful tools in solving the Hubble tension and exploring dark energy. The synergy between these four probes has great prospects.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Wan-Ting Hou, Jing-Zhao Qi, Tao Han, Jing-Fei Zhang, Shuo Cao, Xin Zhang
Summary: With the measurement of the electromagnetic counterpart, gravitational wave standard sirens can be used as a novel cosmological probe with significant implications for cosmology. In this paper, the implications of GW standard sirens on the interaction between dark energy and dark matter are investigated, based on the coincident detections of GW and associated γ-ray bursts (GRB). The combination of both GW and EM observations can effectively break the degeneracies between different cosmological parameters and provide more stringent cosmological fits.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Ze-Wei Zhao, Ling-Feng Wang, Ji-Guo Zhang, Jing-Fei Zhang, Xin Zhang
Summary: This research investigates the capability of future fast radio bursts (FRBs) to constrain the dimensionless coupling parameter in interacting dark energy (IDE) models. The results suggest that future observations have the potential to provide tighter constraints on this parameter compared to current data, offering a promising avenue for precise measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
P. Hartley, A. Bonaldi, R. Braun, J. N. H. S. Aditya, S. Aicardi, L. Alegre, A. Chakraborty, X. Chen, S. Choudhuri, A. O. Clarke, J. Coles, J. S. Collinson, D. Cornu, L. Darriba, M. Delli Veneri, J. Forbrich, B. Fraga, A. Galan, J. Garrido, F. Gubanov, H. Hakansson, M. J. Hardcastle, C. Heneka, D. Herranz, K. M. Hess, M. Jagannath, S. Jaiswal, R. J. Jurek, D. Korber, S. Kitaeff, D. Kleiner, B. Lao, X. Lu, A. Mazumder, J. Moldon, R. Mondal, S. Ni, M. Onnheim, M. Parra, N. Patra, A. Peel, P. Salome, S. Sanchez-Exposito, M. Sargent, B. Semelin, P. Serra, A. K. Shaw, A. X. Shen, A. Sjoberg, L. Smith, A. Soroka, V Stolyarov, E. Tolley, M. C. Toribio, J. M. van der Hulst, A. Vafaei Sadr, L. Verdes-Montenegro, T. Westmeier, K. Yu, L. Yu, L. Zhang, X. Zhang, Y. Zhang, A. Alberdi, M. Ashdown, C. R. Bom, M. Brueggen, J. Cannon, R. Chen, F. Combes, J. Conway, F. Courbin, J. Ding, G. Fourestey, J. Freundlich, L. Gao, C. Gheller, Q. Guo, E. Gustavsson, M. Jirstrand, M. G. Jones, G. Jozsa, P. Kamphuis, J-P Kneib, M. Lindqvist, B. Liu, Y. Liu, Y. Mao, A. Marchal, I Marquez, A. Meshcheryakov, M. Olberg, N. Oozeer, M. Pandey-Pommier, W. Pei, B. Peng, J. Sabater, A. Sorgho, J. L. Starck, C. Tasse, A. Wang, Y. Wang, H. Xi, X. Yang, H. Zhang, J. Zhang, M. Zhao, S. Zuo
Summary: The Square Kilometre Array Observatory (SKAO) will explore the radio sky to conduct transformational science, with large and complex data products that require advanced analysis techniques. SKAO is conducting Science Data Challenges to familiarize the scientific community with the data and drive the development of new analysis techniques. Challenge 2 saw over 100 participants develop new techniques, with the winning strategy combining predictions from two machine learning techniques to achieve a 20% improvement in overall performance.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Peng-Ju Wu, Yichao Li, Jing-Fei Zhang, Xin Zhang
Summary: By using the synergy of three 21 cm intensity mapping experiments, the expansion and growth history of the universe can be traced, and the dark energy parameters can be measured within the framework of general relativity. This study finds that the joint observation of three experiments can provide tight constraints on cosmological parameters.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Astronomy & Astrophysics
Yichao Li, Yougang Wang, Furen Deng, Wenxiu Yang, Wenkai Hu, Diyang Liu, Xinyang Zhao, Shifan Zuo, Shuanghao Shu, Jixia Li, Peter Timbie, Reza Ansari, Olivier Perdereau, Albert Stebbins, Laura Wolz, Fengquan Wu, Xin Zhang, Xuelei Chen
Summary: This work presents the initial results of drift-scan observation for the HI intensity mapping survey with FAST. The findings show that the calibration strategy can correct gain variation and the continuum maps have slightly higher pixel noise levels than predicted. The flux-weighted differential number count is consistent with the NVSS catalog down to the confusion limit of 7 mJy beam(-1).
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ming Zhang, Yichao Li, Jing-Fei Zhang, Xin Zhang
Summary: This study explores the potential of using MeerKAT H i intensity-mapping observations in interferometer mode to estimate the power spectrum and constrain cosmological parameters. The choice of survey fields has a significant impact on the fractional errors of the power spectrum within a limited observational time. Increasing the integration time gradually decreases the fractional errors until cosmic variance becomes dominant. The performance of H i intensity-mapping in constraining typical dark-energy models is found to be limited, even when combined with Planck data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yue Shao, Yidong Xu, Yougang Wang, Wenxiu Yang, Ran Li, Xin Zhang, Xuelei Chen
Summary: The 21-cm absorption lines from atomic hydrogen, known as the 21-cm forest, can be used to probe both the mass of dark matter particles and the heating history of the Universe. They provide a unique way to study small-scale structures during reionization and constrain the properties of dark matter. By measuring the one-dimensional power spectrum of the 21-cm forest, we can break the degeneracy in the dark matter model and increase the sensitivity of the probe.
Article
Physics, Particles & Fields
Yan Liu, Xi-Jing Wang, Jian-Pin Wu, Xin Zhang
Summary: We have created a holographic superfluid that exhibits different behaviors depending on the positive or negative gauge-axion coupling, such as metallic or insulating behavior in the normal state. The system also displays a mid-IR peak in the AC conductivity due to the competition between explicit and spontaneous symmetry breaking, leading to the presence of a pseudo-Goldstone mode. Additionally, the AC conductivity shows a dip at low frequencies, resulting from the excitation of the spontaneous symmetry breaking Goldstone mode.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Cheng Gong, Tao Zhu, Rui Niu, Qiang Wu, Jing-Lei Cui, Xin Zhang, Wen Zhao, Anzhong Wang
Summary: The standard model extension (SME) is used to study the violations of Lorentz symmetry in gravitational interactions. This study focuses on the modified dispersion relation of gravitational waves (GWs) due to Lorentz violation, and calculates the modified waveforms generated by compact binary mergers. By analyzing 90 GW events and employing parameter estimation, no evidence of Lorentz violation in GW data is found, and 90% confidence intervals for each Lorentz violating coefficient are provided.
Article
Astronomy & Astrophysics
Qi-Ming Fu, Xin Zhang
Summary: In this paper, the quantum effects on the redshift, blueshift, and gravitational redshift of photons emitted by massive particles revolving around a polymerized black hole were investigated. Elegant and concise expressions for the mass of the black hole and the quantum parameter were obtained, and it was found that all the frequency shifts of photons decrease as the quantum parameter decreases. The leading contributions to the frequency shift were found to come from the kinematic shift and peculiar shift, while the quantum effects made a negligible contribution. Additionally, the effects of plasma on the redshift/blueshift were studied for the first time, and it was concluded that the presence of plasma results in a decrease in the redshift/blueshift.
