期刊文献+
共找到346篇文章
< 1 2 18 >
每页显示 20 50 100
A Solvable Model in Two—Dimensional Gravity Coupled to a Nonlinear Matter Field 被引量:3
1
作者 YANJun TAOBi-You 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第1期19-21,共3页
The two-dimensional gravity model with a coupling constant k = 4 and a vanishing cosmological constant coupled to a nonlinear matter field is investigated. We found that the classical equations of motion are exactly s... The two-dimensional gravity model with a coupling constant k = 4 and a vanishing cosmological constant coupled to a nonlinear matter field is investigated. We found that the classical equations of motion are exactly solvable and the static solutions of the induced metric and scalar curvature can be obtained analytically. These solutions may be used to describe the naked singularity at the origin. 展开更多
关键词 二维引力场 非线性物质场 可解模型
下载PDF
Dark Matter Particles May Never Be Directly Detected by Instruments—A Dark Matter Mechanism That Does Not Exceed the Standard Model Framework
2
作者 Wenbing Qiu 《Journal of Modern Physics》 2024年第5期596-612,共17页
A dark matter mechanism within the framework of the standard model (SM) of particle physics is proposed in this article that the essence of dark matter may be the excited virtual particle field by the gravitational fi... A dark matter mechanism within the framework of the standard model (SM) of particle physics is proposed in this article that the essence of dark matter may be the excited virtual particle field by the gravitational field of ordinary matter, which contains virtual photons, virtual positive and negative electron pairs, virtual gluons, virtual positive and negative quark pairs, virtual neutrinos etc. In this mechanism, there are two basic assumptions: 1) the stronger the gravitational field of ordinary matter, the greater the excited energy (mass) density of virtual particle field;2) The excited virtual particle field is generally very weak in self-interaction. The virtual particle field excited by gravity can exhibit the properties of dark matter and may become a dark matter candidate. Based on this new dark matter mechanism, the hydrodynamic equations and cosmic perturbation equations describing cosmic matter are improved, and this may be meaningful for solving the challenges faced by the standard cosmological model (Lambda-CDM or LCDM) and developing and perfecting LCDM model. 展开更多
关键词 Dark matter Virtual Particle Gravitational field Ordinary matter
下载PDF
The Space Structure, Force Fields, and Dark Matter 被引量:1
3
作者 Ding-Yu Chung Volodymyr Krasnoholovets 《Journal of Modern Physics》 2013年第4期27-31,共5页
It is proposed that the digital space structure consists of attachment space (denoted as 1) for rest mass and detachment space (denoted as 0) for kinetic energy. Attachment space attaches to object permanently with ze... It is proposed that the digital space structure consists of attachment space (denoted as 1) for rest mass and detachment space (denoted as 0) for kinetic energy. Attachment space attaches to object permanently with zero speed, and detachment space detaches from the object at the speed of light. The combination of attachment space and detachment space brings about the three structures: binary lattice space, miscible space, and binary partition space. Binary lattice space, (1 0)n, consists of repetitive units of alternative attachment space and detachment space. In miscible space, attachment space is miscible to detachment space without separation. Binary partition space, (1)n(0)n, consists of separated continuous phases of attachment space and detachment space. Binary lattice space, miscible space, and binary partition space constitute quantum mechanics, special relativity, and the extreme force fields, respectively. Through the detachment space, a higher dimensional particle in attachment space is sliced into infinitely surrounding a lower dimensional core attachment space, resulting in a particle surrounding by gauge field in the form of binary lattice space. The 10d particle can be sliced into 9d, 8d, 7d, 6d, 5d, and 4d particles equally by mass, corresponding to baryonic particle as 4d and dark matter as other 5 particles, so the ratio between baryonic matter and dark matter is 1 to 5, in agreement with the observed ratio. At extreme conditions, such as extremely low temperature, the gauge force field in the form of binary lattice space is transformed into the extreme force field in the form of binary partition space to explain extreme phenomena, such as superconductivity. 展开更多
关键词 Space Structure Quantum MECHANICS FORCE fieldS DARK matter SUPERCONDUCTIVITY
下载PDF
The Basic Concepts and Basic Laws Relating to Matter and Gravitational Fields in Physics
4
作者 Fangpei Chen 《Journal of Modern Physics》 2017年第11期1784-1794,共11页
In this work, the author applied the universal gauge field theory and Noether theorem to prove that universality exists for the Lorentz and Levi-Civita law of conservation of energy momentum tensor density. We also fo... In this work, the author applied the universal gauge field theory and Noether theorem to prove that universality exists for the Lorentz and Levi-Civita law of conservation of energy momentum tensor density. We also found that this conservation law has profound implications in physics. For example, based on this law, one can explore the origin of the matter field, and propose a new view about what is “dark energy” and what is “dark matter”. 展开更多
关键词 LAGRANGIAN matter field GRAVITATIONAL field ENERGY-MOMENTUM TENSOR Density Conservation Law Origin of matter field
下载PDF
A Mean-Field Treatment in Studying Nuclear Matter Through a Thermodynamic Consistent Resummation Scheme
5
作者 舒崧 李家荣 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第5期379-382,共4页
We used the Cornwall, Jackiw and Tomboulis (CJT) resummation scheme to study nuclear matter. In the CJT formalism the meson propagators are treated as the bare propagators and the the higher order loop corrections o... We used the Cornwall, Jackiw and Tomboulis (CJT) resummation scheme to study nuclear matter. In the CJT formalism the meson propagators are treated as the bare propagators and the the higher order loop corrections of the thermodynamic potential are evaluated at the Hartree approximation, while the vacuum fluctuations are ignored. Under these treatments in the CJT formalism we derived exact mean-field theory (MFT) results for the nuclear matter. The results are thermodynamically consistent, and our study indicates that the MFT result is the lowest order resummation result in the CJT resummation scheme. The relation between CJT formalism and MFT is clearly presented through the calculations. 展开更多
关键词 nuclear matter finite-temperature field theory resummation scheme
下载PDF
Determining Nuclear Form factor for Detection of Dark Matter in Relativistic Mean Field Theory
6
作者 陈亚正 罗延安 +2 位作者 李磊 中虹 李学潜 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第6期1059-1064,共6页
在这个工作,我们以相对论的吝啬的域(RMF ) 为在儒弱的人和原子核之间的纺纱无关的碰撞导出原子表格因素理论。有通常在文学被使用的传统的表格因素的比较被给,我们的结果稍微在上面,这被发现在4%~8%的 2PF 模型,但是为全部在15%~... 在这个工作,我们以相对论的吝啬的域(RMF ) 为在儒弱的人和原子核之间的纺纱无关的碰撞导出原子表格因素理论。有通常在文学被使用的传统的表格因素的比较被给,我们的结果稍微在上面,这被发现在4%~8%的 2PF 模型,但是为全部在15%~25%从舵柄表格因素背离撤退 0 ~的精力光谱 100 keV 。而且,作为例子拿 Xe 和 Ge,我们在 recoil 精力上显示出表格因素的依赖。 展开更多
关键词 相对论平均场理论 外形 暗物质 探测 传统形式 核自旋 RMF 反冲
下载PDF
Classical SU(3) Gauge Field as a Dark Matter
7
作者 Vladimir Dzhunushaliev 《Journal of Modern Physics》 2013年第8期111-120,共10页
The model of dark matter is presented where the dark matter is a classical gauge field. A spherical symmetric solution of Yang-Mills equation is obtained. The asymptotic behavior of the gauge fields and matter density... The model of dark matter is presented where the dark matter is a classical gauge field. A spherical symmetric solution of Yang-Mills equation is obtained. The asymptotic behavior of the gauge fields and matter density is investigated. It is shown that the distribution of the matter density allows us interpret it as the dark matter. The fitting of a typical rotational curve with the rotational curve created by the spherical solution of SU(3) Yang-Mills equation is 展开更多
关键词 DARK matter COLOR GAUGE field
下载PDF
Effects of Limited Water Supply and Ridge Plotted Field on Soybean Yield and Dry Matter Accumulation
8
作者 ZHOU Jianghong WEI Yongxiat WANG Chao 《Journal of Northeast Agricultural University(English Edition)》 CAS 2006年第1期27-30,共4页
The drought in spring leads to the lack of soil water, which influents sprout and bud of crops, which furthermore affects growth and yield of crops. Studying the technology integration of bed-irrigating sowing, the me... The drought in spring leads to the lack of soil water, which influents sprout and bud of crops, which furthermore affects growth and yield of crops. Studying the technology integration of bed-irrigating sowing, the mending irrigation of seedling stage and the effect of water-saving of ridge plotted field, analyzing the finger of yield and dry matter accumulation, water-saving technology integration have good effects on water-saving, water storage and increasing moisture on soil and enhancement of soybean yield. 展开更多
关键词 limited water supply ridge plotted field YIELD dry matter accumulation
下载PDF
Isovector Scalar Field Effects in Asymmetric Nuclear Matter
9
作者 LIU Bo SHEN Cai-Wan +1 位作者 M. Di Toro ZHAO En-Guang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第1期199-206,共8页
包括 isovector 数量 &#948;-field,联合常数的核子介子的密度依赖者 parametrization 模型被用于不对称的原子物质。状态(曙光女神) 和中子星性质的原子方程在相对论的 Lagrangian 密度被学习,用相对论的吝啬的领域(RMF ) 强子... 包括 isovector 数量 &#948;-field,联合常数的核子介子的密度依赖者 parametrization 模型被用于不对称的原子物质。状态(曙光女神) 和中子星性质的原子方程在相对论的 Lagrangian 密度被学习,用相对论的吝啬的领域(RMF ) 强子理论。在不变的联合计划的 &#948;-field 在稠密的充满中子的物质并且到质子和中子的明确的切开导致更大的排斥,这被知道有效群众,最后影响中子星的稳定性。我们使用核子介子政变石楠的密度依赖者模型学习中子星物质的性质并且再考在不对称的原子物质的 &#948;-field 效果。我们中子星的稳定性条件有关系的计算表演能在联合常数的密度依赖者模型在 &#948;-meson 的存在被改进。原子物质的曙光女神强烈取决于相互作用的密度依赖。 展开更多
关键词 密度相互性 相对论 强子 核子 中子
下载PDF
Elevation and Land Use Types Have Significant Impacts on Spatial Variability of Soil Organic Matter Content in Hani Terraced Field of Yuanyang County,China 被引量:5
10
作者 LI Feng-bo LU Guang-de +6 位作者 ZHOU Xi-yue NI Hui-xiang XU Chun-chun YUE Chao YANG Xiu-mei FENG Jin-fei FANG Fu-ping 《Rice science》 SCIE CSCD 2015年第1期27-34,共8页
Soil organic matter (SOM) content is one of the most important indicators of the sustainability of soil. To maintain sustainable soil utilization and management in fragile Hani terraced field, it is meaningful to in... Soil organic matter (SOM) content is one of the most important indicators of the sustainability of soil. To maintain sustainable soil utilization and management in fragile Hani terraced field, it is meaningful to investigate the effects of topography and land use type on SOM content. Descriptive statistics and geostatistics were used to analyze the data and the kriging method was applied to map the spatial patterns of SOM content. The results showed that the mean SOM content was 32.76 g/kg, with a variation coefficient of 40%. The SOM content was affected by elevation and land use type. As the increase of elevation, the SOM content in Hani terraced field also increased obviously. The SOM content in tea garden, which is almost at high elevation, was the highest in all six land use types, and the SOM content decreased in a following sequence: tea garden 〉 paddy field 〉 corn field 〉 banana garden 〉 cassava field 〉 sugarcane field. In addition, at the same elevation, the paddy field had the highest SOM content compared with other land use types. All these results demonstrate that paddy field is the most efficient and suitable land use type for SOM conservation at high, middle or low elevations in the fragile Hani terraced field. In order to protect soil quality and maintain the sustainable agricultural development, it is necessary to maintain or even to enlarge the area of paddy field in Yuanyang county, Yunnan Province, China. 展开更多
关键词 Hani terraced field ELEVATION land use type GEOSTATISTICS soil organic matter content
下载PDF
Matter-Antimatter Asymmetry from Preon Condensation Prior to the Hadron Epoch
11
作者 Richard B. Holmes 《Journal of Modern Physics》 2023年第11期1437-1451,共15页
A universe consisting of protons, neutrons, and electrons with electrical neutrality is consistent with an equal number of c and preons, assuming the rishon preon theory of Shupe and Harari. Similarly, a universe cons... A universe consisting of protons, neutrons, and electrons with electrical neutrality is consistent with an equal number of c and preons, assuming the rishon preon theory of Shupe and Harari. Similarly, a universe consisting of antiprotons, antineutrons, and positrons with electrical neutrality is consistent with an equal number of c and preons. Hence, any combination of such matter-antimatter compositions is also consistent with an equal number of c and preons and overall electrical neutrality. It is proposed that the difference observed in baryon-antibaryon number density relative to photon number density, ~5 × 10<sup>-10</sup>, is due to allocation of preons between matter and antimatter during preon condensation into normal matter. Three approaches of increasing rigor and complexity are considered: 1) an allocation at times corresponding to the Planck temperature due to fluctuations, 2) an allocation at times corresponding to quark formation due to preon bonding, and 3) an allocation at times corresponding to the electroweak scale. All approaches can give the correct order of magnitude of the asymmetry assuming out-of-equili-brium freeze-out and a slight and allowed charge (C) asymmetry in preon condensation in a self-consistent quantum field theory. Sakharov’s baryon non-conservation condition is evidently circumvented with these approaches, because they assume another level of matter (preons) which is present before quark formation. Thus, preons can provide an elementary explanation of primordial matter-antimatter asymmetry. A relationship between Higgs boson states and preons is proposed. 展开更多
关键词 matter-Antimatter Asymmetry COSMOLOGY Astroparticle Physics Quantum field Theory Global Symmetries
下载PDF
固定污染源废气颗粒物现场测试关键性能指标校验方法的研究
12
作者 武超 刘倩倩 陈波 《环境科技》 2024年第1期51-55,共5页
传统污染源颗粒物监测方法虽保证了质量但耗时过长;而快速检测方法多以间接测量为主,测量信号与质量浓度量的对应关系无法现场进行校核。基于便携式振荡天平法采用标准膜重量直接验证方式解决了设备性能无法现场核查的难题,无需重新建... 传统污染源颗粒物监测方法虽保证了质量但耗时过长;而快速检测方法多以间接测量为主,测量信号与质量浓度量的对应关系无法现场进行校核。基于便携式振荡天平法采用标准膜重量直接验证方式解决了设备性能无法现场核查的难题,无需重新建立测量信号与质量浓度量的对应关系。研究表明:在水平振动为56.2~94.4 dB,垂直振动为58.4~96.5 dB条件下,测试前、后振荡天平称量值与标准滤膜定值的相对误差均不大于±3.5%,标准偏差均小于0.5%。该研究为固定污染废气颗粒物的现场快速监测提供了有效的质量保证。 展开更多
关键词 固定染污源 颗粒物 现场监测 性能指标 校验方法研究
下载PDF
Performance evaluation on field synergy and composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter 被引量:5
13
作者 左青松 鄂加强 +3 位作者 龚金科 D.M.Zhang 陈韬 贾国海 《Journal of Central South University》 SCIE EI CAS 2014年第12期4599-4606,共8页
In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwav... In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved. 展开更多
关键词 柴油机微粒过滤器 场协同理论 再生时间 性能评价 添加剂 复合 微波 铈基
下载PDF
Apparent softening of the symmetry energy with the inclusion of non-nucleonic components in nuclear matter 被引量:1
14
作者 JIANG Weizhou 《Nuclear Science and Techniques》 SCIE CAS CSCD 2013年第5期34-37,共4页
Apparent softening of the symmetry energy with the inclusion of hyperon and quark degrees of freedom is demonstrated by the fact that the phase transition causes the change of the interaction and the suppression of nu... Apparent softening of the symmetry energy with the inclusion of hyperon and quark degrees of freedom is demonstrated by the fact that the phase transition causes the change of the interaction and the suppression of nucleon fractions.The demonstration is fulfilled in the relativistic mean-field model. 展开更多
关键词 对称能 软化 核子 核物质 相对论平均场模型 成分 夸克自由度 相互作用
下载PDF
Estimation of Turnover and Equilibrium of Soil Organic Matter Using a Mathematical Approach 被引量:2
15
作者 WU Chun-Yan CHEN Yi WANG Jia-Yu WANG Sheng-Jia 《Pedosphere》 SCIE CAS CSCD 2006年第5期634-645,共12页
The methods based on N uptake of aerial-plants, soil organic matter (SOM) dynamics, Jenny's equation, and actual measurement of long-term field experiments in Jiaxing, Quzhou, Huangyan and Hangzhou of Zhejiang Pro... The methods based on N uptake of aerial-plants, soil organic matter (SOM) dynamics, Jenny's equation, and actual measurement of long-term field experiments in Jiaxing, Quzhou, Huangyan and Hangzhou of Zhejiang Province, China were used to determine the organic mineralization rate being helpful in estimating the organic requirement for SOM equilibrium. The results showed that the estimated mineralization ratios of SOM for Jiaxing and Quzhou were, respectively, 0.0404 and 0.0508 based on N uptake of aerial-plants in non-fertilized plots; 0.0405 and 0.012 using SOM dynamics in non-fertilized plots; and 0.0413 and 0.0513 using the actual investigated data and Jenny's equation. With Jenny's equation, soil organic C balance in manure + N-P-K plots was estimated at nearly 28.8 g kg-1 for Jiaxing and 32.4 g kg-1 for Quzhou with predicted SOM linearly related to the actual investigated values (r2 = 0.9640 for Jiaxing and 0.8541 for Quzhou). To maintain the SOM balance in the non-fertilized plots the recommended rate of organic materials was 3 000-6 600 kg ha-1, and the relevant rates of farm yard manure (FYM) in the manure and N-P-K plots were estimated at 3 375 (dry) and 17670 kg ha-1 (wet) for Jiaxing, 1845 (dry) and 6090 kg ha-1 (wet) for Quzhou. 展开更多
关键词 土壤 平衡 数学模型 稻土 有机物质
下载PDF
Next Frontier in Physics—Space as a Complex Tension Field 被引量:1
16
作者 Chandrasekhar Roychoudhuri 《Journal of Modern Physics》 2012年第10期1357-1368,共12页
We hypothesize that 100% of the energy of our cosmic system is held by a physically real Complex Tension Field (CTF). We are using an old methodology of thinking used by our forefather engineers long before the advent... We hypothesize that 100% of the energy of our cosmic system is held by a physically real Complex Tension Field (CTF). We are using an old methodology of thinking used by our forefather engineers long before the advent of modern scientific thinking. We call it Interaction Process Mapping Epistemology or IPM-E. We apply this IPM-E on to the prevailing Measurable Data Modeling Epistemology or MDM-E. This approach helped us analyze the “Measurement Problem”, recognized during the rise of quantum mechanics (QM), and helped us recover a universal property of all linear waves, that they do not interact, or interfere, with each other. This Non-Interaction of Waves, or the NIW-property, should be obvious through daily observations and through the Huygens-Fresnel diffraction integral and through critical evaluation of contradictory hypotheses we have been assigning to photons through ages. This implicates that the time-frequency Fourier theorem, although mathematically correct, and is used universally in all branches of science;does not map the real physical interaction processes for most optical phenomena. Accordingly, we present the necessary modifications for a few selected phenomena in classical and quantum optics to validate the NIW-property. In the process we find that accepting photons as non-interacting, but diffractively propagating linear wave packets crossing the entire cosmic space, requires CTF as a physical medium. Then we develop logical arguments in support of stable elementary particles as nonlinear but resonant vortex-like undulations of this same CTF. These vortex-like particles impose various secondary potential gradients around themselves giving rise to the four forces we know. Thus, CTF can serve as the cosmic substrate to develop a unified field theory without the need of dark matter and dark energy. In the process, we demonstrate a path to add ontologic thinking on our biologically successful epistemic thinking. 展开更多
关键词 Non-Interaction of WAVES COSMIC Tension field DARK Energy and matter Platform for UNIFIED field Theory
下载PDF
Corrections to the Casimir Force Due to Interactions of Plasmons and Electromagnetic Field
17
作者 李铜忠 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第3期288-292,共5页
Considering the interaction between the electromagnetic field and matter field, a concise method is used to calculate the ground-state energy of the interacting system. With the assumption of squeezed-like state, a ne... Considering the interaction between the electromagnetic field and matter field, a concise method is used to calculate the ground-state energy of the interacting system. With the assumption of squeezed-like state, a new vacuum state is obtained for the inte racting system. The energy of the new vacuum state is obviously lower than that of unperturbed vacu um state. Based on the new vacuum state, the correction to the Casimir force is obtained. The r esult shows that the contribution of the interaction is a repulsive one and the Casimir effect is attributed to both electromagnetic field and matter field. On the basis of the obtained results, th e recent experimental data can be explained reasonably. 展开更多
关键词 电磁场 胞质基因 交互作用 作用力 卡西米尔效应
下载PDF
Influence of a scalar-isovector δ-meson field on the quark phase structure in neutron stars 被引量:1
18
作者 Grigor Bakhshi Alaverdyan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2010年第12期1255-1264,共10页
The deconfinement phase transition from hadronic matter to quark matter in the interior of compact stars is investigated. The hadronic phase is described in the framework of relativistic mean-field theory, where the s... The deconfinement phase transition from hadronic matter to quark matter in the interior of compact stars is investigated. The hadronic phase is described in the framework of relativistic mean-field theory, where the scalar-isovector 6-meson effec- tive field is also taken into account. The MIT bag model for describing a quark phase is used. The changes of the parameters of phase transition caused by the presence of a δ-meson field are explored. Finally, alterations in the integral and structural parameters of hybrid stars due to both a deconfinement phase transition and inclusion of a δ-meson field are discussed. 展开更多
关键词 dense matter -- equation of state -- mean-field -- stars: neutron --quark
下载PDF
The World Physical Triad: Matter, Antimatter and “Dark Energy” in the Processes of Climatic Changes on the Earth 被引量:3
19
作者 Robert A. Sizov 《Journal of Modern Physics》 2016年第6期558-572,共15页
The opening and many years of research of magnetic spinor particles (real magnetic charges) in atoms and substance have enabled the author to formulate the conception of the Physical Triad, according which the real Wo... The opening and many years of research of magnetic spinor particles (real magnetic charges) in atoms and substance have enabled the author to formulate the conception of the Physical Triad, according which the real World consists of three fundamental phases: Matter, Antimatter and Energo-phase (Energo-medium). Particles of Matter are called spinors and particles of Antimatter are called antispinors. Energo-medium is a gasiform phase of high density that fills by himself all the infinite space of the real World. It consists of spinless and massless particles-energions. Spinor fields can be both flows energions (fields of Matter), so and anti-flow energions (fields of Antimatter). Atomic-shaped structures consisting of electric and magnetic spinor particles represent a Physical Mass (atoms, nucleons, etc.). The main characteristic of all varieties of Mass is its ability radiate gravitational field, which is a vortex electromagnetic field. All spinor particles are massless so as individually generate a gravitational field they can’t. All primary forces in the real World are implemented by means of Energo-medium, i.e. contact pressure its particles—energions. The spinor fields, including the gravitational field, myself the real of the power significance, have not. They are only intermediaries, inducing in Energo-medium its active (power) education, which is called “Dark Energy”. “Dark Energy” can be both positive, so and negative. Namely, a positive “Dark Energy”, which is associated with the technical activity of man, is responsible for stable climatic changes on Earth. Greenhouse gases are not the main “culprit” of climatic changes on our planet. However, these gases are the simplest indicator of the overall level of irreversible physical processes that stimulate the growth of the positive “Dark Energy” and are responsible for the negative thermal scenario on Earth. 展开更多
关键词 Magnetic and Electric Spinorial Particles (Spinors and Antispinors) Antielectrons Magnetons Antimagnetons Bispinor Physical Mass Vortex Electromagnetic (Gravitational) field matter ANTImatter Energo-Medium Energions “Dark Energy” Climatic Changes
下载PDF
Constraints on axion-like particles with different magnetic field models from the PKS 2155–304 energy spectrum
20
作者 Jia Bu Ya-Ping Li 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2019年第10期152-158,共7页
Axion-like particles(ALPs) are a promising kind of dark matter candidate particle that are predicted to couple with photons in the presence of magnetic fields. The oscillations between photons and ALPs traveling in th... Axion-like particles(ALPs) are a promising kind of dark matter candidate particle that are predicted to couple with photons in the presence of magnetic fields. The oscillations between photons and ALPs traveling in the magnetic fields have been used to constrain ALP properties. In this work, we obtain some new constraints on the ALP mass ma and the photon-ALP coupling constant g with two different magnetic field models through TeV photons from PKS 2155–304. The first is the discrete-Φ model in which the magnetic field has the orientation angle Φ that changes discretely and randomly from one coherent domain to the next, and the second is the linearly-continuous-Φ model in which the magnetic field orientation angle Φ varies continuously across neighboring coherent domains. For the discrete-Φ model, we can obtain the best constraints on the ALP mass m1 = ma/(1 neV)= 0.1 and on the photon-ALP coupling constant g11= g/(10^-11 GeV^-1)= 5. The reasonable range of the ALP mass m1 is 0.08 ~ 0.2 when g11 = 5,and the only reasonable value of the photon-ALP coupling constant is g11 = 5 when m1 = 0.1. For the linearly-continuous-Φ model, we can obtain the best constraints on the ALP mass m1 = 0.1 and on the photon-ALP coupling constant g11 = 0.7. The reasonable range of the ALP mass m1 is 0.05 ~ 0.4 when g11= 0.7, and the reasonable range of the photon-ALP coupling constant g11 is 0.5 ~ 1 when m1 = 0.1.All of the results are consistent with the upper bound(g < 6.6 × 10^-11 GeV^-1, i.e., g11 < 6.6) set by the CAST experiment. 展开更多
关键词 COSMOLOGY DARK matter-gamma RAYS general-galaxies magnetic fields
下载PDF
上一页 1 2 18 下一页 到第
使用帮助 返回顶部