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Prospects for measuring dark energy with 21 cm intensity mapping experiments

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arXiv 2021年

作者： Wu, Peng-Ju Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China

Using the 21 cm intensity mapping (IM) technique can efficiently perform large-scale neutral hydrogen (H i) surveys, and this method has great potential for measuring dark-energy parameters. Some 21 cm IM experiments aiming at measuring dark energy in the redshift range of 0 0) = 0.080 and σ(wa) = 0.25 in the CPL model. Compared with CMB+BAO+SN, Tianlai can provide tighter constraints in ΛCDM and wCDM, but looser constraints (tighter than CMB+BAO) in CPL, and the combination CMB+BAO+SN+Tianlai gives σ(w) = 0.013, σ(w0) = 0.055, and σ(wa) = 0.13. In addition, it is found that the synergy of FAST (0 © 2021, CC BY.

关键词： Surveys

Understanding Co2 Adsorption in Layered Double Oxides Synthesized by Slag Through Kinetic and Modelling Techniques

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SSRN

SSRN 2023年

作者： Duan, Wenjun Han, Jiachen Yang, Shuo Wang, Zhimei Yu, Qingbo Zhan, Yaquan School of Metallurgy Northeastern University No 11 Lane 3 Wenhua Road Heping District Liaoning Shenyang110819 China College of Energy and Environment Shenyang Aerospace University No. 37 Daoyi South Street Shenbei New District Liaoning Shenyang110136 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 China

A novel technology for high-value utilization of blast furnace slag, a main by-product in iron and steel industry, was proposed to address CO2 capture. Layered double hydroxides derived from blast furnace slag served as the raw material for producing efficient CO2 adsorbents, referred to as layered double oxides. Detailed investigations were conducted to compare the characteristics of the raw material and the resulting adsorbent. Significantly, the laminate structure of layered double hydroxides changed in microstructure, particle size distribution and functional groups. In thermal transformation, about 30% weight was lost, forming layered double oxides with CaO, Ca12Al14O32Cl2 and MgO phases. The transformation mechanism for preparing layered double oxides was elucidated. Additionally, the CO2 adsorption performance of layered double oxides was studied, and a suitable kinetic model was established. Under conditions of 15% CO2 concentration and 873 K temperature, the sample exhibited a CO2 capacity of approximately 147.49 mg‧g-1. The optimal kinetic mechanism model for CO2 adsorption was identified as PSO, with activation energy and pre-exponential factors of 56.88 kJ‧mol-1 and 12.26 min-1, respectively. This study successfully achieved dual goals: reducing CO2 emissions and maximizing the value of solid waste in iron and steel industry. © 2023, The Authors. All rights reserved.

关键词： Slags

A new cosmological probe using super-massive black hole shadows

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Chinese Physics C 2020年第5期44卷 119-123页

作者： Jing-Zhao Qi Xin Zhang Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Ministry of Education’s Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern UniversityShenyang 110819China Center for High Energy Physics Peking UniversityBeijing 100080China Center for Gravitation and Cosmology Yangzhou UniversityYangzhou 225009China

We study the prospects of using the low-redshift and high-redshift black hole shadows as new cosmological standard rulers for measuring cosmological *** show that,using the low-redshift observation of the black hole shadow of M87?,the Hubble constant can be independently determined with a precision of about 13%as H0=70±9 km s?1 Mpc?*** high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters H0 andΩm,and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters.

关键词： black hole shadow cosmological probe standard ruler cosmological parameters the Hubble constant

Quantum controlling and the topological properties of the magnon photo-transport in two-dimensional collinear ferromagnet

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arXiv 2025年

作者： Li, Jun-Cen Du, An College of Sciences Northeastern University Shenyang110004 China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University China Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Ministry of Education China

In our work, we study magnon transport induced by light through Aharonov-Casher (AC) effect, including magnon spin photocurrent (MSPC) and magnon energy photocurrent (MEPC). Firstly, we regard the effect of the electric field on the magnon through the AC effect as a perturbation. Then we derived the expressions of MSPC and MEPC in two-dimensional collinear ferromagnetic system. And we apply our theory to the two-dimension ferromagnetic Hexagonal and Kagome lattice. We find that the optical frequency and the relaxation time of the material can be used to control the photo-transport of magnons. In addition, under the condition of low light frequncy and infinite relaxation time, the longitudinal magnon photo-transport is related to the topological property of the magnon system. Copyright © 2025, The Authors. All rights reserved.

关键词： Ferromagnetic materials

Cosmology with fast radio bursts in the era of SKA

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arXiv 2023年

作者： Zhang, Ji-Guo Zhao, Ze-Wei Li, Yichao Zhang, Jing-Fei Li, Di Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Northeastern University Shenyang110819 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 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 Ministry of Education Northeastern University Shenyang110819 China

We present a forecast of the cosmological parameter estimation using fast radio bursts (FRBs) from the upcoming Square Kilometre Array (SKA), focusing on the issues of dark energy, the Hubble constant, and baryon density. We simulate 105 and 106 localized FRBs from a 10-year SKA observation, and find that: (i) using 106 FRB data alone can tightly constrain dark-energy equation of state parameters better than CMB+BAO+SNe, providing an independent cosmological probe to explore dark energy;(ii) combining the FRB data with gravitational-wave standard siren data from 10-year observation with the Einstein Telescope, the Hubble constant can be constrained to a sub-percent level, serving as a powerful low-redshift probe;(iii) using 106 FRB data can constrain the baryon density Ωbh to a precision of ∼ 0.1%. Our results indicate that SKA-era FRBs will provide precise cosmological measurements to shed light on both dark energy and the missing baryon problem, and help resolve the Hubble tension. Copyright © 2023, The Authors. All rights reserved.

关键词： Cosmology

Alternating current conductivity and superconducting properties of the holographic effective theory

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arXiv 2022年

作者： Liu, Yan Wang, Xi-Jing Wu, Jian-Pin Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Center for Gravitation and Cosmology College of Physical Science and Technology Yangzhou University Yangzhou225009 China Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry Ministry of Education Northeastern University Shenyang110819 China

We construct a holographic effective superconducting theory by considering a special gauge-axion higher derivative term. The gauge-axion coupling results in the transport behavior similar to the vortex response in the dual boundary field theory leading to non-Drude behavior of alternating current (AC) conductivity at the weak momentum dissipation. With the momentum dissipation increasing, a dip exhibits in the AC conductivity at low frequency. It is thought to be the result of a combination of the strong momentum dissipation and the gauge-axion coupling. In the superconducting phase, this gauge-axion coupling also plays a key role leading to a more evident gap at the low frequency conductivity. In addition, we also study the combined effects of the strength of momentum dissipation and various couplings among the gauge field, axion fields and the complex scalar field. Copyright © 2022, The Authors. All rights reserved.

关键词： Momentum

Prospective sensitivity of CTA on detection of evaporating primordial black holes

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arXiv 2025年

作者： Yang, Chen Zhang, Xin Liaoning Key Laboratory of Cosmology and Astrophysics College of Sciences Northeastern University Shenyang110819 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

As the lifetime of a black hole decreases, the energy of the Hawking radiation it emits increases, ultimately culminating in its disappearance through a powerful burst of gamma rays. For primordial black holes (PBHs) with an initial mass of ∼ 5 × 1014 g, their lifespans are expected to end in the present epoch. Detecting such PBH bursts would provide compelling evidence of their existence. The Cherenkov Telescope Array (CTA) has the potential to observe these bursts at the high-energy end of the gamma-ray spectrum. To investigate this possibility, we conduct a study to evaluate the sensitivity of CTA to the local burst rate density of PBHs. Our results suggest that during a 5-year observational campaign, CTA could exclude a local burst rate density exceeding ∼ 36 pc−3 yr−1, which represents an improvement of one order of magnitude over the upper limit set by the Large High Altitude Air Shower Observatory (LHAASO). In addition, we propose an observation strategy optimized for detecting PBH bursts. Copyright © 2025, The Authors. All rights reserved.

关键词： Gamma radiography

Using a multi-messenger and multi-wavelength observational strategy to probe the nature of dark energy through direct measurements of cosmic expansion history

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arXiv 2021年

作者： Qi, Jing-Zhao Jin, Shang-Jie Fan, Xi-Long Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences MOE Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China School of Physics and Technology Wuhan University Wuhan430072 China

In the near future, the redshift drift observations in optical and radio bands will provide precise measurements on H(z) covering the redshift ranges of 2 0) = 0:024 and σ(wa) = 0:17 in the CPL model, which means tha... 详细信息

关键词： Gravity waves

Molten-Salt Enhanced Anodic Oxidation for Upcycling Alloy Scraps

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SSRN

SSRN 2022年

作者： Zhao, Yan Chen, Xiang Qu, Jiakang Xie, Hongwei Du, Kaifa Xing, Pengfei Wang, Dihua Sun, Yuan Yin, Huayi Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education School of metallurgy Northeastern University Shenyang110819 China School of Resource and Environmental Science Wuhan University Wuhan430072 China Institute of Metal Research Chinese Academy of Sciences Shenyang110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry of Ministry of Education Northeastern University Shenyang110819 China

Reclaiming valuable metals from spent alloys involves energy-intensive pulverization and the sluggish dissolution rate. Herein, we propose an enhanced corrosion strategy to convert alloy scraps to oxide powders. The oxidation rate reaches ~1.67 mm h-1 in molten CaCl2 -NaCl-CaO at 700 oC because Cl- excludes passivation and enables continuous oxidation. In addition, the soluble CaO in molten CaCl2-NaCl prevents the generation of transition metal chlorides, which relieves using the expensive ion-selective membrane to eliminate the parasitic reaction. Overall, the molten salt enhanced anodic corrosion provides a green and general way to achieve the pulverization and oxidation of various alloy scraps. © 2022, The Authors. All rights reserved.

关键词： Sodium chloride