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Constraints on neutrino mass in the scenario of vacuum energy interacting with cold dark matter after Planck 2018

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arXiv 2020年

作者： Li, Hai-Li Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education’s Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China Center for Gravitation and Cosmology Yangzhou University Yangzhou225009 China

In this work, we investigate the constraints on the total neutrino mass in the scenario of vacuum energy interacting with cold dark matter (abbreviated as IΛCDM) by using the latest cosmological observations. We consider four typical interaction forms, i.e., Q = βHρde, Q = βHρc, Q = βH0ρde, and Q = βH0ρc, in the IΛCDM scenario. To avoid the large-scale instability problem in interacting dark energy models, we employ the extended parameterized post-Friedmann method for interacting dark energy to calculate the perturbation evolution of dark energy in these models. The observational data used in this work include the cosmic microwave background (CMB) measurements from the Planck 2018 data release, the baryon acoustic oscillation (BAO) data, the type Ia supernovae (SN) observation (Pantheon compilation), and the 2019 local distance ladder measurement of the Hubble constant H0 from the Hubble Space Telescope. We find that, compared with those in the ΛCDM+P mν model, the constrains on P mν are looser in the four IΛCDM+P mν models. When considering the three mass hierarchies of neutrinos, the constraints on P mν are tightest in the degenerate hierarchy case and loosest in the inverted hierarchy case. In addition, in the four IΛCDM+P mν models, the values of coupling parameter β are larger using the CMB+BAO+SN+H0 data combination than that using the CMB+BAO+SN data combination, and β > 0 is favored at more than 1σ level when using CMB+BAO+SN+H0 data combination. The issue of the H0 tension is also discussed in this paper. We find that, compared with the ΛCDM+P mν model, the H0 tension can be alleviated in the IΛCDM+P mν model to some extent. Copyright © 2020, The Authors. All rights reserved.

关键词： Acoustic intensity measurement

Nanohertz gravitational waves from a quasar-based supermassive black hole binary population model as dark sirens

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arXiv 2024年

作者： Xiao, Si-Ren Shao, Yue Wang, Ling-Feng Song, Ji-Yu Feng, Lu Zhang, Jing-Fei Zhang, Xin Liaoning Key Laboratory of Cosmology and Astrophysics College of Sciences Northeastern University Shenyang110819 China School of Physics and Optoelectronic Engineering Hainan University Haikou570228 China College of Physical Science and Technology Shenyang Normal University Shenyang110034 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China

Recently, several pulsar timing array (PTA) projects have detected evidence of the existence of a stochastic gravitational wave background (SGWB) in the nanohertz frequency band, providing confidence in detecting individual supermassive black hole binaries (SMBHBs) in the future. Nanohertz GWs emitted by inspiraling SMBHBs encode the luminosity distances of SMBHBs. They can serve as dark sirens to explore the cosmic expansion history via a statistical method to obtain the redshift information of GW sources’ host galaxies using galaxy catalogs. The theoretical analysis of the dark siren method relies on the modeling of the population of SMBHBs. Using a population model consistent with the latest SGWB observations is essential, as the SGWB provides significant information about the distribution of SMBHBs. In this work, we employ a quasar-based model, which can self-consistently account for the SGWB amplitude, to estimate the population of SMBHBs. We constrain the Hubble constant using the mock GW data from different detection cases of PTAs in the future. Our results show that a PTA consisting of 100 pulsars with a white noise level of 20 ns could measure the Hubble constant with a precision close to 1% over a 10-year observation period, and a PTA with 200 pulsars may achieve this goal over a 5-year observation period. The results indicate that modeling the SMBHB population significantly influences the analysis of dark sirens, and SMBHB dark sirens have the potential to be developed as a valuable cosmological probe. Copyright © 2024, The Authors. All rights reserved.

关键词： White noise

Models of vacuum energy interacting with cold dark matter: Constraints and comparison

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arXiv 2018年

作者： Li, Hai-Li Feng, Lu Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China College of Physical Science and Technology Shenyang Normal University Shenyang110034 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

In this paper, we investigate the observational constraints on the scenario of vacuum energy interacting with cold dark matter. We consider eight typical interaction forms in such an interacting vacuum energy scenario. The observational data used in this work to constrain these models include the JLA sample of type Ia supernovae observation, the Planck 2015 distance priors data of cosmic microwave background anisotropies observation, the baryon acoustic oscillations data, and the Hubble constant direct measurement. We find that the current observational data almost equally favor these interacting vacuum energy models. We also find that for all these models of vacuum energy interacting with cold dark matter the case of no interaction is actually well consistent with the current observational data within 1σ range. Copyright © 2018, The Authors. All rights reserved.

关键词： Galaxies

Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21-cm Forest Observations

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arXiv 2024年

作者： Niu, Qi Li, Yichao Xu, Yidong Guo, Hong Zhang, Xin Liaoning Key Laboratory of Cosmology and Astrophysics College of Sciences Northeastern University Shenyang110819 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences Beijing100101 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China

The 21-cm forest is a sensitive probe for the early heating process and small-scale structures during the epoch of reionization (EoR), to be realized with the upcoming Square Kilometre Array (SKA). Its detection relies on the availability of radio-bright background sources, among which the radio-loud quasars are very promising, but their abundance during the EoR is still poorly constrained due to limited observations. In this work, we use a physics-driven model to forecast future radio-loud quasar observations. We fit the parameters of the model using observational data of high-redshift quasars. Assuming Eddington accretion, the model yields an average lifetime of tq ∼ 105.5yr for quasars at z ∼ 6, consistent with recent results obtained from quasar proximity zone observation. We show that if the radio-loud fraction of quasars evolves with redshift, it will significantly reduce the abundance of observable radio-loud quasars in the SKA era, making 21-cm forest studies challenging. With a constant radio-loud fraction, our model suggests that a one-year sky survey conducted with SKA-LOW has the capability to detect approximately 20 radio-loud quasars at z ∼ 9, with sufficient sensitivity to resolve individual 21-cm forest lines. Copyright © 2024, The Authors. All rights reserved.

关键词： Radio astronomy

Constraints on active and sterile neutrinos in an interacting dark energy cosmology

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arXiv 2019年

作者： Feng, Lu He, Dong-Ze Li, Hai-Li Zhang, Jing-Fei Zhang, Xin College of Physical Science and Technology Shenyang Normal University Shenyang110034 China Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education's Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

We investigate the impacts of dark energy on constraining massive (active/sterile) neutrinos in interacting dark energy (IDE) models by using the current observations. We employ two typical IDE models, the interacting w cold dark matter (IwCDM) model and the interacting holographic dark energy (IHDE) model, to make an analysis. To avoid large-scale instability, we use the parameterized post-Friedmann approach to calculate the cosmological perturbations in the IDE models. The cosmological observational data used in this work include the Planck cosmic microwave background (CMB) anisotropies data, the baryon acoustic oscillation data, the type Ia supernovae data, the direct measurement of the Hubble constant, the weak lensing data, the redshift-space distortion data, and the CMB lensing data. We find that the dark energy properties could influence the constraint limits of active neutrino mass and sterile neutrino parameters in the IDE models. We also find that the dark energy properties could influence the constraints on the coupling strength parameter β, and a positive coupling constant, β > 0, can be detected at the 2.5σ statistical significance for the IHDE+νs model by using the all-data combination. In addition, we also discuss the "Hubble tension" issue in these scenarios. We find that the H0 tension can be effectively relieved by considering massive sterile neutrinos, and in particular in the IHDE+νs model the H0 tension can be reduced to be at the 1.28σ level. Copyright © 2019, The Authors. All rights reserved.

关键词： Microwave oscillators

Protective effect of active ingredient of Ferula sinkiangensis on global cerebral ischemia-reperfusion mice

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中国药理学与毒理学杂志 2019年第9期33卷 735-735页

作者： ZHANG Wen-qiang MI Yan XU Ji-kai LI Ning HOU Yue College of Life and Health Sciences Northeastern UniversityShenyang 110169China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern UniversityMinistry of EducationShenyang 110169China School of Traditional Chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang 110016China

OBJECTIVE Learning and memory impairment is one of the common sequelae of stroke patients,which is called"post-stroke dementia"and seriously affects the quality of life of the *** post-stroke dementia,there is still no effective clinical *** the present study,we aim to investigate the effect of the active ingredient of Ferula sinkiangensis,AW09,on global cerebral ischemia-reperfusion *** The bilateral common carotid artery occlusion(BCCAO)reperfusion model was used to investigate the protective effect of AW09 on cognitive dysfunction in mice with global cerebral ischemia reperfusion.Y-maze and Morris water maze were used to test the learning and memory ability of *** Y-maze test showed that AW09 treatment significantly increased the spontaneous alternation rate of BCCAO model animals and had no significant effect on the total number of arm *** results of Morris water maze showed that AW09 significantly reduced the escape latency of BCCAO mice during the training *** the probe test phase,AW09 significantly increased the swimming time in target quadrant,distance in target quadrant and number of platform crossings and decreased the swimming time in the quadrant opposite the target quadrant of BCCAO *** AW09,the active ingredient of Ferula sinkiangensis,can improve working memory impairment and spatial memory impairment in animals with global cerebral ischemia-reperfusion,suggesting that AW09 has poten⁃tial therapeutic value for cognitive dysfunction caused by global cerebral ischemia.

关键词： Ferula sinkiangensis ischemia-reperfusion learning and memory.

Stability for Nash Equilibrium Problems

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arXiv 2024年

作者： Diao, Ruoyu Dai, Yu-Hong Zhang, Liwei AMSS Chinese Academy of Sciences Beijing100190 China LSEC AMSS Chinese Academy of Sciences Beijing100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing100049 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Ministry of Education Shenyang110819 China

This paper is devoted to studying the stability properties of the Karush-Kuhn-Tucker (KKT) solution mapping SKKT for Nash equilibrium problems (NEPs) with canonical perturbations. Firstly, we obtain an exact characterization of the strong regularity of SKKT and a sufficient condition that is easy to verify. Secondly, we propose equivalent conditions for the continuously differentiable single-valued localization of SKKT. Thirdly, the isolated calmness of SKKT is studied based on two conditions —— Property A and Property B, and Property B proves to be sufficient for the robustness of both E(p) and SKKT under the convex assumptions, where E(p) denotes the Nash equilibria at perturbation p. Furthermore, we establish that studying the stability properties of the NEP with canonical perturbations is equivalent to studying those of the NEP with only tilt perturbations based on the prior discussions. Finally, we provide detailed characterizations of stability for NEPs whose each individual player solves a quadratic programming (QP) *** Codes 90C30, 90C31, 49J53 Copyright © 2024, The Authors. All rights reserved.

关键词： Quadratic programming

How to Perform Energy-Balanced Underwater data Collection in AUV-Aided UASNs: A Social Welfare-Based Node Clustering Approach

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IEEE Transactions on Computational Social Systems 2024年

作者： Lin, Chuan Han, Guangjie Lu, Chang Hussain Shah, Syed Bilal Zhang, Yu Wang, Feng Northeastern University Software College Shenyang110819 China Hohai University Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Nanjing210013 China Hohai University Key Laboratory of Maritime Intelligent Network Information Technology Ministry of Education Nanjing210013 China Dalian University of Technology School of Software Dalian116024 China Dar Al-Hekma University School of Engineering Computing and Informatics Jeddah21589 Saudi Arabia Suzhou Vocational University School of Engineering Suzhou215004 China

The rapid evolution of the Internet of Underwater Things (IoUT) has led to the widespread adoption of autonomous underwater vehicle (AUV)-assisted underwater acoustic sensor networks (UASNs) for various applications such as marine environment monitoring and resource exploration. This article introduces an energy-balanced data collection scheme tailored for AUV-supported UASNs. The proposed scheme combines a node clustering method based on a social welfare function and an intelligent path planning strategy for the AUV. The node clustering approach integrates canopy and K-means algorithms for initial node clustering, followed by reclustering using an enhanced hierarchical clustering algorithm. To balance energy distribution, Atkinson's social welfare function is employed to select and rotate cluster heads (CHs) within each cluster. To address limited CH memory constraints, a lossless compression technique is introduced to reduce data storage requirements at the CHs. Moreover, the article introduces the use of the deep Q-network (DQN) technique for AUV path planning, considering multiple pertinent factors simultaneously. Simulation results demonstrate that the proposed data collection scheme effectively reduces energy consumption, prolongs network lifespan, and enhances data collection efficiency when compared to recent research endeavors. © 2014 IEEE.

关键词： Marine applications

An Adaptive Cost-Sensitive Learning and Recursive Denoising Framework for Imbalanced SVM Classification

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arXiv 2024年

作者： Jiang, Lu Wang, Qi Chang, Yuhang Song, Jianing Fu, Haoyue Yang, Xiaochun College of Sciences Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China School of Mechanical Engineering and Automation Northeastern University Shenyang110819 China Software College Northeastern University Shenyang110819 China School of Computer Science and Engineering Northeastern University Shenyang110819 China

Category imbalance is one of the most popular and important issues in the domain of classification. Emotion classification model trained on imbalanced datasets easily leads to unreliable prediction. The traditional machine learning method tends to favor the majority class, which leads to the lack of minority class information in the model. Moreover, most existing models will produce abnormal sensitivity issues or performance degradation. We propose a robust learning algorithm based on adaptive cost-sensitivity and recursive denoising, which is a generalized framework and can be incorporated into most stochastic optimization algorithms. The proposed method uses the dynamic kernel distance optimization model between the sample and the decision boundary, which makes full use of the sample’s prior information. In addition, we also put forward an effective method to filter noise, the main idea of which is to judge the noise by finding the nearest neighbors of the minority class. In order to evaluate the strength of the proposed method, we not only carry out experiments on standard datasets but also apply it to emotional classification problems with different imbalance rates (IR). Experimental results show that the proposed general framework is superior to traditional methods in Accuracy, G-mean, Recall and F1-score. Copyright © 2024, The Authors. All rights reserved.

关键词： Adversarial machine learning