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1. chinaXiv:202009.00053 [pdf]

A study of a scalar field probes micro space-time

Jian-Bo Deng; Miao-Yi Deng; Qi-Qi Fan
Subjects: Physics >> The Physics of Elementary Particles and Fields

In this work, we try to find a way to describe the physical law of micro-world under the frame of a space-time theory. By introducing a scalar field D(x), we rewrite the action of conventional field theory and the Lagrangian describing the motion of the particle, where a modified space-time relation is obtained. To prove the correctness of this attempt, we derive the Klein-Gordon equation by the Hamilton-Jacobi method in four dimensional form.

submitted time 2020-09-17 Hits77Downloads35 Comment 0

2. chinaXiv:201910.00072 [pdf]


Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

[目的]分析解决不确定性原理及量子理论在物理诠释方面的分歧。 [方法]对海森堡不确定性原理数学关系式的原始推导、物理涵义进行了重新检视,并考察了不同作用图景下该关系式的极限。 [结果]在电磁作用图景下,通过对量子力学量的统计分布及其全概率空间的分析,获得了非统计诠释下的不确定性关系式被破坏的结果;利用傅里叶变换,导出了虚拟作用图景下相应共轭力学量的标准差约束关系式;通过对电磁作用图景、引力作用图景以及虚拟作用图景所构成集合的考察,获得了微观量子客体力学状态的确定性判则。 [局限]未分析纠缠。 [结论]①非统计诠释存在逻辑矛盾,不确定性关系、现行量子力学理论仅在统计诠释下,才能对微观量子客体在电磁作用图景中的力学状态作出恰当的描述;② 确定性判则显示,微观粒子的力学状态具有客观确定性,其波函数是对电磁作用图景下的微观粒子力学状态统计呈现相的表述;量子力学非统计诠释所指称的个体几率性实质是微观粒子与作用图景之间互作用统计呈现相的概率反映。

submitted time 2020-09-14 Hits12705Downloads938 Comment 0

3. chinaXiv:202008.00076 [pdf]

Note on anomalies in field theories

Subjects: Physics >> The Physics of Elementary Particles and Fields

In this note, we investigate the anomalies in field theories. The results of the anomalies through Feynman diagrams calculation are multi-valued function. These single-valued branches of multi-valued function are related to the bound states of neutral pseudoscalar mesons. Adding these bound state contributions, we obtain a new anomaly free condition that all the external particles are on-shell and find the non-perturbative mass spectrum of neutral pseudoscalar mesons. We also discuss the anomaly in 2 dimensional QFT.

submitted time 2020-09-14 Hits422Downloads129 Comment 0

4. chinaXiv:202009.00012 [pdf]

Shadows of rotating Hayward-de Sitter black holes with astrometric observables

Peng-Zhang He; Qi-Qi Fan; Hao-Ran Zhang; Jian-Bo Deng
Subjects: Physics >> Geophysics, Astronomy, and Astrophysics

Motivated by recent work on rotating black hole shadow [Phys. Rev. D101, 084029 (2020)], we investigate the shadow behaviors of rotating Hayward-de Sitter black hole for static observers at a finite distance in terms of astronomical observables. This paper uses the newly introduced distortion parameter in [arXiv:2006.00685] to describe the shadow's shape quantitatively. We show that the spin parameter would distort shadows and the magnetic monopole charge would increase the degree of deformation. At the same time, the distortion could be relieved because of the cosmological constant and the distortion would increase with the distance from the black hole. Besides, the spin parameter, magnetic monopole charge and cosmological constant increase will cause the shadow to shrink.

submitted time 2020-09-09 Hits1890Downloads78 Comment 0

5. chinaXiv:202009.00011 [pdf]

The cosmological constant from space-time discreteness

Qi-Qi Fan; Cong Li; Hao-Ran Zhang; Peng-Zhang He,; Jian-Bo Deng
Subjects: Physics >> The Physics of Elementary Particles and Fields

We regard the background of space-time as a physical system composed of discrete volume elements at the Planck scale and get the internal energy of space-time by Debye model. A temperature-dependent minimum energy limit of the particles is proposed from the thermal motion part of the internal energy. As decreases of the temperature caused by the expansion of the universe, more and more particles would be "released" because of the change of the energy limit, we regard these new particles as a source of dark energy. The minimum energy limit also leads to a corrected number of particles in universe and a modified conservation equation. According to the modified conservation equation, an effective cosmological constant consistent with its observed value is obtained.

submitted time 2020-09-06 Hits1344Downloads75 Comment 0

6. chinaXiv:202008.00089 [pdf]

On the description of particle system motion

Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Based on the concepts of infinitesimal and super real time-space composed of monads, the equations describing the particle flow are proposed. After the initial conditions are given, the state of the particle system at any time can be obtained by solving these equations. The physical properties of the granular matter, such as the moving velocity, the rotation angle, the angular velocity of rotation, the temperature, the pressure, the density, the mass, etc. at any time and space position are obtained. It is also to obtain that the translational motion is not dependent on rotation motion ofthe particles and can be separately analyzed. For a stationary particle system, theconditions that must be met by the force and force moment on the particles in thesystem are given. On this basis, the properties of the granular matter at rest can befurther explored for.

submitted time 2020-08-25 Hits1440Downloads117 Comment 0

7. chinaXiv:202008.00086 [pdf]


Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

实验测量表明体心立方固溶体 约在 2.0 at.% Mn发生相变,但这一相变的机制,相变前后铁锰体系的物理性质变化至今仍不清楚。本文通过密度泛函计算,揭示了这一相变是一种同构相变,并阐明了相变机制和相变前后物理性质的变化。

submitted time 2020-08-23 Hits1113Downloads128 Comment 0

8. chinaXiv:202006.00241 [pdf]

Responses of leaf water potential and gas exchange to the precipitation manipulation in two shrubs on the Chinese Loess Plateau

LI Yangyang; CHEN Jiacun; AI Shaoshui; SHI Hui
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Regulation of leaf gas exchange plays an important role in the survival of trees and shrubs under future climate change. However, the responses of leaf water potential and gas exchange of shrubs in semi-arid areas to the precipitation alteration are not clear. Here, we conducted a manipulated experiment with three levels of precipitation, i.e., a control with ambient precipitation, 50% above ambient precipitation (irrigation treatment), and 50% below ambient precipitation (drought treatment), with two common shrubs, Salix psammophila C. Wang & C. Y. Yang (isohydric plant, maintaining a constant leaf water potential by stomatal regulation) and Caragana korshinskii Kom. (anisohydric plant, having more variable leaf water potential), on the Chinese Loess Plateau in 2014 and 2015. We measured the seasonal variations of predawn and midday leaf water potential (?pd and ?md), two parameters of gas exchange, i.e., light-saturated assimilation (An) and stomatal conductance (gs), and other foliar and canopy traits. The isohydric S. psammophila had a similar An and a higher gs than the anisohydric C. korshinskii under drought treatment in 2015, inconsistent with the view that photosynthetic capacity of anisohydric plants is higher than isohydric plants under severe drought. The two shrubs differently responded to precipitation manipulation. ?pd, An and gs were higher under irrigation treatment than control for S. psammophila, and these three variables and ?md were significantly higher under irrigation treatment and lower under drought treatment than control for C. korshinskii. Leaf water potential and gas exchange responded to manipulated precipitation more strongly for C. korshinskii than for S. psammophila. However, precipitation manipulation did not alter the sensitivity of leaf gas exchange to vapor-pressure deficit and soil moisture in these two shrubs. Acclimation to long-term changes in soil moisture in these two shrubs was primarily attributed to the changes in leaf or canopy structure rather than leaf gas exchange. These findings will be useful for modeling canopy water-carbon exchange and elucidating the adaptive strategies of these two shrubs to future changes in precipitation.

submitted time 2020-06-22 From cooperative journals:《Journal of Arid Land》 Hits4438Downloads252 Comment 0

9. chinaXiv:202006.00200 [pdf]


Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.


submitted time 2020-06-17 Hits4370Downloads336 Comment 0

10. chinaXiv:202007.00012 [pdf]


Subjects: Physics >> Interdisciplinary Physics and Related Areas of Science and Technology


submitted time 2020-06-13 Hits4124Downloads226 Comment 0

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