共查询到20条相似文献,搜索用时 171 毫秒
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极短距离下的引力服从什么样的规律?迄今已发表的最短距离的实验是检测相距0.2mm的两个质量之间的吸引力,其结论是这时引力仍服从牛顿反平方律,并未显示有弦论(String Theory)所预期的引力加强.在更短距离时能否仍保持这一情况呢? 相似文献
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Fischbach等人对Eotvos实验资料进行了重新分析,并根据Stacey等人在深井中对重力加速度测量的结果,提出了存在“第五种力”的可能性1).Fischbach等人提出的这种力比引力更弱且具有宏观有限的力程,并且被认为可能与物体重子数密度有关. 自那以来,物理学家进行了一系列新实验来检验这种力是否存在以及它的性质.这些实验大致可分为两类:一类是与 Stacey等人的实验类似的地球物理测量.它们主要探测物体间的引力与经典的平方反比定律的偏离,并由此确定是否存在这种新的力.另一类实验着重检测物体间的引力是否和它们的成分有关.因为牛顿-爱因斯… 相似文献
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在牛顿统一了天上力和地上力、麦克斯韦尔统一了电力和磁力之后,电力的库仑公式和磁力的安培公式与牛顿万有引力公式在数学形式上的相似,使人很容易联想到电磁力与引力的统一。爱因斯坦,在1905年创立狭义相对论、1915年创立广义相对论分别改进和完善了麦克斯韦电磁理论和牛顿引力理论之后,试图统一电磁力和引力,花费了后半生近30年的时光去建立统一场论,但至死未能如愿。本讲,我们先介绍爱因斯坦生平;然后介绍他的成功之作:狭义和广义相对论;最后介绍未能完成的统一场论。 相似文献
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还牛顿第二定律的本来面目 总被引:1,自引:0,他引:1
牛顿第二定律是牛顿三定律的精髓,它描述了物体所受力与运动状态改变之间的定量关系。历史上在牛顿第二定律的建立过程及适应范围方面,存在很多误解和争议,损害了牛顿的光辉形象。牛顿第二定律建立过程的历史回顾在牛顿具体提出运动第二定律之前,伽利略已提出这种思想的萌芽,他在批判亚里士多德的力与速度的依赖关系基础上,提出了力与加速度之间的依赖关系,但是他没有也不可能在当时条件下发现作用力与加速度之间的定量关系,并将其发展成科学的基本定律。牛顿接受并发展了伽利略的这种观点。在1684年,他明确提出动质量概念之前,只能定性地探索运动第二定律的内容。 相似文献
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万有引力定律是牛顿在1687年于<自然哲学的数学原理>上发表的.牛顿的普适万有引力定律表示如下: 任意两个质点通过连心线方向上的力相互吸引.该引力的大小与它们的质量乘积成正比,与它们距离的平方成反比,与两物体的化学本质或物理状态以及中介物质无关. 相似文献
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1 引力是什么
牛顿在17世纪就认识到宇宙中任何地方的一切物体的引力作用方式是相同的,且两物体间的吸引力与它们的质量的乘积成比例,与它们距离的平方成反比,即著名的"引力的平方反比律."爱因斯坦在20世纪初发表的广义相对论是研究物质在空间和时间中如何进行引力相互作用的理论,它将平方反比律解释成时空因物质和能量的存在而发生畸变的结果,并把牛顿理论包含在内. 相似文献
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We report a new test of the gravitational inverse square law at millimeter ranges by using a dual-modulation torsion pendulum. An I-shaped symmetric pendulum and I-shaped symmetric attractors were adopted to realize a null experimental design. The non-Newtonian force between two macroscopic tungsten plates is measured at separations ranging down to 0.4 mm, and the validity of the null experimental design was checked by non-null Newtonian gravity measurements. We find no deviations from the Newtonian inverse square law with 95% confidence level, and this work establishes the most stringent constraints on non-Newtonian interaction in the ranges from 0.7 to 5.0 mm, and a factor of 8 improvement is achieved at the length scale of several millimeters. 相似文献
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A null experimental test of the Newtonian inverse-square law at submillimeter range using a torsion pendulum was presented. Under the dual modulations of both the expected signal and the gravitational torque for calibration, our data concluded with 95% confidence that no new forces were observed and any gravitational-strength Yukawa forces (|alpha|>or=1) must have a length scale lambda<66 microm, agreeing well with the latest result of the E?t-wash group. Our result sets a unification energy scale of M*>or=2.8 TeV/c2 for the two compactified extra space dimensions with the same size R*<47 microm. 相似文献
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We report measurements of the short-range forces between two macroscopic gold-coated plates using a torsion pendulum. The force is measured for separations between 0.7 and 7 μm and is well described by a combination of the Casimir force, including the finite-temperature correction, and an electrostatic force due to patch potentials on the plate surfaces. We use our data to place constraints on the Yukawa-type "new" forces predicted by theories with extra dimensions. We establish a new best bound for force ranges 0.4-4 μm and, for forces mediated by gauge bosons propagating in (4+n) dimensions and coupling to the baryon number, extract a (4+n)-dimensional Planck scale lower limit of M(*)>70 TeV. 相似文献
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Hoyle CD Schmidt U Heckel BR Adelberger EG Gundlach JH Kapner DJ Swanson HE 《Physical review letters》2001,86(8):1418-1421
Motivated by higher-dimensional theories that predict new effects, we tested the gravitational 1/r(2) law at separations ranging down to 218 microm using a 10-fold symmetric torsion pendulum and a rotating 10-fold symmetric attractor. We improved previous short-range constraints by up to a factor of 1000 and find no deviations from Newtonian physics. 相似文献
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Yu. N. Pokotilovski 《Physics of Atomic Nuclei》2006,69(6):924-931
Constraints for the constants of hypothetical Yukawa-type corrections to the Newtonian gravitational potential are obtained
from analysis of neutron scattering experiments. Restrictions are obtained for the interaction range between 10−12 and 10−7 cm, where Casimir force experiments and atomic-force microscopy are not sensitive. Experimental limits are obtained also
for nonelectromagnetic inverse-power-law neutron-nucleus potentials. Some possibilities are discussed to strengthen these
constraints.
The text was submitted by the author in English. 相似文献
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杆摆中的内力、内力矩及其功 总被引:2,自引:0,他引:2
讨论了杆摆运动中的切向内力及其力矩、法向内力及其力矩;计算了内力及内力矩所作的功,这对进一步理解“质点”、“刚体”等概念有一定的参考价值. 相似文献
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Considering that gravitational force might deviate from Newton's inverse-square law (ISL) and become much stronger in small
scale, we propose a kind of optical spectroscopy experiment to detect this possible deviation and take electronic, muonic
and tauonic hydrogen atoms as examples. This experiment might be used to indirectly detect the deviation of ISL down to nanometer
scale and to explore the possibility of three extra dimensions in ADD's model, while current direct gravity tests cannot break
through micron scale and go beyond two extra dimensions scenario.
PACS numbers: 04.80.-y, 11.10.Kk, 32.30.-r. 相似文献
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Carbone L Cavalleri A Dolesi R Hoyle CD Hueller M Vitale S Weber WJ 《Physical review letters》2003,91(15):151101
The low-frequency resolution of space-based gravitational wave observatories such as LISA (Laser Interferometry Space Antenna) hinges on the orbital purity of a free-falling reference test mass inside a satellite shield. We present here a torsion pendulum study of the forces that will disturb an orbiting test mass inside a LISA capacitive position sensor. The pendulum, with a measured torque noise floor below 10 fN m/square root of Hz from 0.6 to 10 mHz, has allowed placement of an upper limit on sensor force noise contributions, measurement of the sensor electrostatic stiffness at the 5% level, and detection and compensation of stray dc electrostatic biases at the millivolt level. 相似文献
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Measurement of Newton's constant using a torsion balance with angular acceleration feedback 总被引:2,自引:0,他引:2
We measured Newton's gravitational constant G using a new torsion balance method. Our technique greatly reduces several sources of uncertainty compared to previous measurements: (1) It is insensitive to anelastic torsion fiber properties; (2) a flat plate pendulum minimizes the sensitivity due to the pendulum density distribution; (3) continuous attractor rotation reduces background noise. We obtain G = (6.674215+/-0.000092) x 10(-11) m3 kg(-1) s(-2); the Earth's mass is, therefore, M = (5.972245+/-0.000082) x 10(24) kg and the Sun's mass is M = (1.988435+/-0.000027) x 10(30) kg. 相似文献