Article
Astronomy & Astrophysics
A. Hernandez-Almada, Genly Leon, Juan Magana, Miguel A. Garcia-Aspeitia, V Motta, Emmanuel N. Saridakis, Kuralay Yesmakhanova
Summary: In this study, we investigate Kaniadakis-holographic dark energy by comparing it with observational data. By conducting a Markov Chain Monte Carlo analysis using cosmic chronometers, supernovae type Ia, and Baryon Acoustic Oscillations data, we find that the Kaniadakis parameter is constrained around zero, which is consistent with the standard Bekenstein-Hawking entropy. Additionally, the present matter density parameter Omega((0))(m) is slightly smaller in the Kaniadakis scenario compared to the Lambda CDM model. Furthermore, we reconstruct the evolution of the Hubble, deceleration, and jerk parameters and extract the redshift of the deceleration-acceleration transition.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ryong Gwang Kim, Jik Su Kim, Kwang Hyon Kim, Chang Hyok Ri, Yeon Ung Jang
Summary: This study establishes a model of holographic dark energy interacting with dark matter in a flat universe and validates it with observational data, addressing the coincidence problem by obtaining the deceleration parameter and coincidence parameter.
ASTROPHYSICS AND SPACE SCIENCE
(2021)
Article
Astronomy & Astrophysics
U. Y. Divya Prasanthi, Y. Aditya
Summary: This paper discusses the cosmic evolution of the anisotropic and spatially homogeneous Kantowski-Sachs universe with Renyi holographic dark energy in the background of general relativity. The study includes calculations of cosmological aspects of dynamical parameters, such as the dark energy equation of state parameter, and explores the stability of the model, which is found to be stable at initial epoch but unstable at present and late times. The analysis also indicates that the model comprises quintessence, phantom dark energy regions, and the Lambda CDM limit.
PHYSICS OF THE DARK UNIVERSE
(2021)
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
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
Astronomy & Astrophysics
Niklas Becker, Deanna C. Hooper, Felix Kahlhoefer, Julien Lesgourgues, Nils Schoeneberg
Summary: Researchers explored the possibility of dark matter interacting simultaneously with photons, baryons, and dark radiation, using a new version of the Boltzmann code to reassess cosmological bounds in multi-interacting dark matter scenarios. Their study found that the combination of dark matter-photon and dark matter-DR interactions could potentially alleviate cosmological tensions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
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
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
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
Ling-Feng Wang, Jie-Hao Zhang, Dong-Ze He, Jing-Fei Zhang, Xin Zhang
Summary: By utilizing time-delay cosmography measurements, the authors constrained interacting dark energy models and found that some models could alleviate tensions between cosmological parameters. However, no single model performed well in all aspects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Celia Escamilla-Rivera, Aldo Gamboa
Summary: In this study, we propose a cosmological model based on the holographic principle that allows for an interaction between dark energy and dark matter to explain the accelerated expansion of the universe. By using redshift parameterizations, we obtain an analytical expression for the Hubble parameter and test it with observational data. Our findings not only support the validity of our proposed model, but also provide some insights into the coincidence problem and the Hubble tension in cosmology.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Arindam Saha, Anirban Chanda, Sagar Dey, Souvik Ghose, B. C. Paul
Summary: We investigate both the interacting and non-interacting Renyi Holographic Dark Energy (RHDE) models in the Dvali-Gabadadze-Porrati (DGP) braneworld framework. The cosmological parameters and their evolutions are probed to obtain realistic cosmological models. We note that both models can accommodate the present accelerating phase of expansion with the observed dark energy density. Classical stability of the cosmological model and the Om-diagnostic are also studied to test the suitability of the cosmological models obtained in the presence of RHDE in the DGP braneworld.
MODERN PHYSICS LETTERS A
(2023)
Article
Astronomy & Astrophysics
Marco Chianese, Damiano F. G. Fiorillo, Rasmi Hajjar, Gennaro Miele, Ninetta Saviano
Summary: Using the most up-to-date upper bounds on gamma-ray flux, this study derives global limits on dark matter lifetime in various mass ranges and provides constraints for representative decay channels. These constraints cover unexplored parameter space and show that future neutrino telescopes will bring improvement in observations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Da Huang, Bum-Hoon Lee, Gansukh Tumurtushaa, Lu Yin, Yun-Long Zhang
Summary: The study examines the holographic Friedman-Robertson-Walker universe on the 4-dimensional membrane embedded in the 5-dimensional bulk spacetime and fits the parameters with observational data. It is found that the model with the brane cosmological constant can fit data as well as the standard Lambda CDM universe, and the sigma(8) tension observed in different large-structure experiments can be effectively relaxed in this holographic scenario.
PHYSICS OF THE DARK UNIVERSE
(2021)
Editorial Material
Astronomy & Astrophysics
Yungui Gong
Article
Optics
Hongjin Wu, Jiwei Qi, Hao Hu, Sihao Zhang, Xianhui Fu, Qiang Wu, Zongqiang Chen, Jing Chen, Xuanyi Yu, Qian Sun
Summary: In this work, a composite intrinsic chiral structure was designed by introducing an anisotropic environment around the extrinsic chiral structure. The designed structure consisted of an extrinsic chiral nanocrescent based on an anisotropic substrate. Simulation results showed that intrinsic chirality could be obtained and tuned by changing the angle between the optical axis of the anisotropic substrate and the mirror axis of the nanocrescent (f). The maximum circular dichroism (CD) value reached approximately 0.035. Additionally, the intrinsic chirality was attributed to a new symmetry breaking introduced by the anisotropic substrate to the extrinsic chiral structure, as suggested by the charge distributions. This study offers a new insight into chirality generation and has the potential to advance the application of chirality in imaging, sensing, etc.
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS
(2023)
Article
Chemistry, Physical
Shuo Li, Qiang Wu, Haokun Ding, Songsong Wu, Xinwei Cai, Rui Wang, Jun Xiong, Guangyang Lin, Wei Huang, Songyan Chen, Cheng Li
Summary: In this study, a p-WSe2/n-Ge vdW heterojunction phototransistor with a Schottky barrier collector on n-Ge for broadband photodetection is reported. The phototransistor exhibits high responsivities, photocurrent gain, and fast response time, making it suitable for high-performance broadband photodetection.
Article
Cell Biology
Fei Liu, Liwei Cao, Shejing Hu, Hongxiang Ye, Qiang Wu, Le Wu
Summary: Exploring the use of muscone to promote microglia transformation from M1 to M2 phenotype is a feasible strategy to suppress neuroinflammation and enhance functional recovery after ischemic stroke. This study provides evidence that muscone treatment reduces infarct volume and decreases pro-inflammatory factors while increasing anti-inflammatory agents through the activation of PPAR-gamma signaling pathway.
CELLULAR IMMUNOLOGY
(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
Tao Zhu, Wen Zhao, Anzhong Wang
Summary: This paper investigates the observational effects of spatial covariant gravities on the propagation of gravitational waves (GWs) and obtains the observational constraints on coupling coefficients of spatial covariant gravities from GW observations. The effects of spatial covariant gravities on the propagation equation of GWs can be divided into three classes: frequency-independent effects on GW speed and friction, a parity-violating amplitude and velocity birefringences, and a Lorentz-violating damping rate and dispersion of GWs. By comparing these effects with the observational results from LIGO/Virgo/KAGRA data, the most comprehensive constraints on spatial covariant gravities are derived.
Article
Astronomy & Astrophysics
Jian-Ming Yan, Cheng Liu, Tao Zhu, Qiang Wu, Anzhong Wang
Summary: In this paper, the publicly available observational data of 17 stellar stars orbiting Sgr A* are used to test the quantum extension of Schwarzschild spacetime in loop quantum gravity (LQG). The effects of LQG on the pericenter advance of the stellar stars are calculated and compared with astrometric and spectroscopic data. Monte Carlo Markov Chain (MCMC) simulations are performed, and no significant evidence of the quantum-extended Schwarzschild black hole from LQG is found. The result of S2 provides the strongest bound on the LQG parameter A lambda, placing an upper bound at 95% confidence level of A lambda < 0.302.
Article
Astronomy & Astrophysics
Jiong Lin, Shengqing Gao, Yungui Gong, Yizhou Lu, Zhongkai Wang, Fengge Zhang
Summary: We address the potential-restriction issue in K/G inflation by introducing nonminimal coupling, where the Higgs field drives inflation in accordance with cosmic microwave background (CMB) observations and enhances curvature perturbations at small scales, thereby explaining the formation of primordial black holes (PBHs) and scalar induced gravitational waves (SIGWs). We further analyze the effect of the noncanonical kinetic coupling function and its observational constraint. Additionally, we provide a gauge invariant expression for the integral kernel of SIGWs, which relates to terms propagating at the speed of light. Lastly, we examine the non-Gaussian effect on the abundance of PBHs and SIGWs, finding that while non-Gaussianity facilitates PBH formation, it has negligible impact on the energy density of SIGWs.
Article
Physics, Particles & Fields
Xuchen Lu, Yungui Gong
Summary: Hubble tension is a significant problem in cosmology, and by recalibrating the luminosity distances using gravitational waves, the issues of zero-point calibration and model dependence in SNe Ia measurements can be resolved.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Wen-Cong Gan, Geeth Ongole, Emanuele Alesci, Yang An, Fu-Wen Shu, Anzhong Wang
Summary: This paper systematically studies the top-down model of loop quantum black holes, which replaces the classical singularity of black holes with a regular transition surface. The study shows that the inverse volume corrections are not important for macroscopic black holes, and the transition surface divides the spacetime into two regions with different asymptotic behaviors.
Article
Astronomy & Astrophysics
Xiao-Mei Kuang, Zi-Yu Tang, Bin Wang, Anzhong Wang
Summary: In this study, we investigate the strong gravitational lensing effect around rotating black holes in different gravity theories. We evaluate the lensing observables, including image position, separation, magnification, and time delays, to distinguish between modified gravity (MOG) theory and general relativity (GR). We also analyze the shadow observables and obtain a constraint on the MOG parameter based on Event Horizon Telescope observations.
Article
Medicine, Research & Experimental
Wenbin Yang, Emily Jeong Cerier, Felix L. Nunez-Santana, Qiang Wu, Yuanqing Yan, Chitaru Kurihara, Xianpeng Liu, Anjana Yeldandi, Nigar Khurram, Diego Avella-Patino, Haiying Sun, G. R. Scott Budinger, Daniel Kreisel, Thalachallour Mohanakumar, Emilia Lecuona, Ankit Bharat
Summary: Preexisting lung-restricted autoantibodies (LRAs) are associated with a higher incidence of primary graft dysfunction (PGD) and can worsen graft dysfunction by causing damage to lung epithelial cells. LRA-mediated injury is distinct from ischemia-reperfusion injury and is mainly mediated by complement pathways and IL-1β-induced permeabilization of pulmonary vascular endothelium.
JOURNAL OF CLINICAL INVESTIGATION
(2022)
Article
Medicine, Research & Experimental
Melissa Querrey, Stephen Chiu, Emilia Lecuona, Qiang Wu, Haiying Sun, Megan Anderson, Megan Kelly, Sowmya Ravi, Alexander V. Misharin, Daniel Kreisel, Ankit Bharat, G. R. Scott Budinger
Summary: Using a mouse lung transplant model, researchers found that excessive activation of Toll-like receptors 2 and 4 (TLR2 and -4) on nonclassical monocytes leads to the release of CXCL2, which worsens primary graft dysfunction (PGD). Deleting CD11b in nonclassical monocytes increases CXCL2 production, while administering a CD11b agonist can inhibit CXCL2 production and alleviate PGD. Additionally, the molecule HMGB1 induces CXCL2 production via TLR4/MyD88 in nonclassical monocytes, and inhibiting HMGB1 can attenuate PGD. This study suggests that CD11b may be a potential therapeutic target for preventing PGD in lung transplant recipients.
JOURNAL OF CLINICAL INVESTIGATION
(2022)
Article
Physics, Particles & Fields
Kimet Jusufi, Saurabh Kumar, Mustapha Azreg-Ainou, Mubasher Jamil, Qiang Wu, Cosimo Bambi
Summary: In this study, we investigate the possibility of a wormhole as a candidate for the central object of Sgr A(star) and test this idea by constraining their geometry using the motion of S2 star and the reconstructed shadow images. We consider three wormhole models and find that they satisfy the flare out condition. We also explore the accretion of infalling gas model and study the accretion rate, electromagnetic radiation intensity, and shadow images.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Chao Zhang, Yungui Gong, Dicong Liang, Chunyu Zhang
Summary: This study introduces a specific data analysis pipeline for detecting the polarization modes of gravitational waves. Through an example analysis using simulated data, it demonstrates that the method is capable of detecting pure and mixed polarizations without knowing the exact polarization modes.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
