scholarly journals Gravitational lensing in Tangherlini spacetime in the weak gravitational field and the strong gravitational field

2014 ◽  
Vol 90 (6) ◽  
Author(s):  
Naoki Tsukamoto ◽  
Takao Kitamura ◽  
Koki Nakajima ◽  
Hideki Asada
Keyword(s):  
Gravitational Field ◽  
Gravitational Lensing ◽  
Strong Gravitational Field ◽  
Weak Gravitational Field

Sedimentation of Substitutional Solute Atoms in Intermetallic Compound of Bi-Pb System under Ultra-Strong Gravitational Field

2005 ◽  
Vol 237-240 ◽  
pp. 1101-1106 ◽  
Author(s):  
Masao Ono ◽  
Xin Sheng Huang ◽  
Takahiro Kinoshita ◽  
Hideto Ueno ◽  
Toyotaka Osakabe ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Intermetallic Compound ◽  
Time Duration ◽  
Experimental Conditions ◽  
Strong Gravitational Field ◽  
Weak Gravitational Field ◽  
Substitutional Solute ◽  
Starting State ◽  
Solute Atoms ◽  
Composition Changes

Ultra-strong gravitational field can induce sedimentation of even atoms in condensed matter. We had realized sedimentation of substitutional solute atoms in some miscible alloys. In this study, the ultra-centrifuge experiments were performed on an intermetallic compound of Bi-Pb system (Bi3Pb7) by changing time duration of experiment time (experimental conditions; maximum centrifugal force: 1.0x106g level, temperature: 130-150 °C, duration: 30-150h, state: solid). Composition changes were observed in the centrifuged samples. And, it was found that the Bi phase appeared from starting state of Bi3Pb7 around the weak gravitational field region of the sample. These results showed that sedimentation of substitutional solute atoms occurred, and induced the structure change in intermetallic compounds.

ASYMPTOTICAL CONFORMAL INVARIANCE IN “FINITE” SU(2) GAUGE THEORIES IN CURVED SPACE-TIME

1989 ◽  
Vol 04 (20) ◽  
pp. 1955-1961 ◽  
Author(s):  
S.D. ODINTSOV ◽  
F. SH. ZAPIROV
Keyword(s):  
Gravitational Field ◽  
Conformal Invariance ◽  
Gauge Theories ◽  
Space Time ◽  
Coupling Constants ◽  
Effective Coupling ◽  
Field Limit ◽  
Curved Space ◽  
Strong Gravitational Field ◽  
Weak Gravitational Field

The behavior of effective coupling constants in one-loop “finite” SU(2) gauge theories in curved space-time is investigated. It is shown that in strong gravitational field the effective coupling constants, corresponding to the parameters of non-minimal interaction of scalars and gravitational field, tend to the conformal values (asymptotical conformal invariance) or increase in an exponential fashion. The weak gravitational field limit is also considered in the same models.

Nonlocal Gravity

2017 ◽  
Author(s):  
Bahram Mashhoon
Keyword(s):  
Gravitational Field ◽  
Gravitational Lensing ◽  
Past History ◽  
Lorentz Invariance ◽  
Minkowski Spacetime ◽  
Field Measurements ◽  
Local Principle ◽  
History Of ◽  
Expansion Of The Universe ◽  
Nearby Galaxies

A postulate of locality permeates through the special and general theories of relativity. First, Lorentz invariance is extended in a pointwise manner to actual, namely, accelerated observers in Minkowski spacetime. This hypothesis of locality is then employed crucially in Einstein’s local principle of equivalence to render observers pointwise inertial in a gravitational field. Field measurements are intrinsically nonlocal, however. To go beyond the locality postulate in Minkowski spacetime, the past history of the accelerated observer must be taken into account in accordance with the Bohr-Rosenfeld principle. The observer in general carries the memory of its past acceleration. The deep connection between inertia and gravitation suggests that gravity could be nonlocal as well and in nonlocal gravity the fading gravitational memory of past events must then be taken into account. Along this line of thought, a classical nonlocal generalization of Einstein’s theory of gravitation has recently been developed. In this nonlocal gravity (NLG) theory, the gravitational field is local, but satisfies a partial integro-differential field equation. A significant observational consequence of this theory is that the nonlocal aspect of gravity appears to simulate dark matter. The implications of NLG are explored in this book for gravitational lensing, gravitational radiation, the gravitational physics of the Solar System and the internal dynamics of nearby galaxies as well as clusters of galaxies. This approach is extended to nonlocal Newtonian cosmology, where the attraction of gravity fades with the expansion of the universe. Thus far only some of the consequences of NLG have been compared with observation.

scholarly journals Some effects on relativistic quantum systems due to a weak gravitational field

2005 ◽  
Vol 35 (4b) ◽  
pp. 1110-1112 ◽  
Author(s):  
Geusa de A. Marques ◽  
Sandro G. Fernandes ◽  
V. B. Bezerra
Keyword(s):  
Gravitational Field ◽  
Relativistic Quantum ◽  
Quantum Systems ◽  
Weak Gravitational Field

Sedimentation of Impurity Atoms in InSb Semiconductor under a Strong Gravitational Field

2009 ◽  
Vol 289-292 ◽  
pp. 319-322 ◽  
Author(s):  
Yusuke Iguchi ◽  
Masao Ono ◽  
Satoru Okayasu ◽  
Tsutomu Mashimo
Keyword(s):  
Gravitational Field ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Atomic Scale ◽  
Semiconductor Materials ◽  
Strong Gravitational Field ◽  
Impurity Atoms ◽  
Graded Structure ◽  
Alloys And Compounds ◽  
Crystal Wafer

An atomic-scale graded structure has been formed by sedimentation of substitutional atoms under an ultra-strong gravitational field of 1 million G level in alloys and compounds. In this study, we investigate the sedimentation of impurity atoms in semiconductor materials under a strong gravitational field. High-temperature ultracentrifuge experiments (0.59×106 G, 400°C, 60 hours) have been performed on an InSb single crystal wafer which surface was coated with Ge by means of Physical Vapor Deposition (PVD). It was observed that the penetration depth of diffused Ge atoms under the gravitational field was several times larger than under terrestrial field at the same temperatures.

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