scholarly journals GRAVITATIONAL EFFECTS ON A RIGID CASIMIR CAVITY

2002 ◽  
Vol 17 (06n07) ◽  
pp. 804-807 ◽  
Author(s):  
E. CALLONI ◽  
L. DI FIORE ◽  
G. ESPOSITO ◽  
L. MILANO ◽  
L. ROSA
Keyword(s):  
Gravitational Field ◽  
Opposite Direction ◽  
Gravitational Acceleration ◽  
Vacuum Fluctuations ◽  
Gravitational Effects ◽  
Experimental Detection ◽  
Weak Gravitational Field ◽  
Order Of Magnitude ◽  
Cavity Configuration

Vacuum fluctuations produce a force acting on a rigid Casimir cavity in a weak gravitational field. Such a force is here evaluated and is found to have opposite direction with respect to the gravitational acceleration; the order of magnitude for a multi-layer cavity configuration is analyzed and experimental detection is discussed, bearing in mind the current technological resources.

scholarly journals On the gravitational field of a point-like body immersed in a quantum vacuum

2019 ◽  
Vol 491 (4) ◽  
pp. 4816-4828 ◽  
Author(s):  
Dragan Slavkov Hajdukovic
Keyword(s):  
Gravitational Field ◽  
Weak Interactions ◽  
Opposite Sign ◽  
Gravitational Acceleration ◽  
Quantum Vacuum ◽  
Vacuum Fluctuations ◽  
Additional Source ◽  
Cosmological Constant Problem ◽  
Maximal Magnitude ◽  
Gravitational Dipoles

ABSTRACT Quantum vacuum and the matter immersed in it interact through electromagnetic, strong and weak interactions. However, we have zero knowledge of the gravitational properties of the quantum vacuum. As an illustration of the possible fundamental gravitational impact of the quantum vacuum, we study the gravitational field of an immersed point-like body. This is done under the working hypothesis, that quantum vacuum fluctuations are virtual gravitational dipoles (i.e. two gravitational charges of the same magnitude but opposite sign); coincidentally, this hypothesis makes quantum vacuum free of the cosmological constant problem. The major result is that a point-like body creates a halo of polarized quantum vacuum around itself, which acts as an additional source of gravity. There is a maximal magnitude ${g_{\rm qv\max}}$ of gravitational acceleration that can be caused by a polarized quantum vacuum; the small size of this magnitude (${g_{\rm qv\max}} < 6\ \times {10^{ - 11}}\,\mathrm{ m\,s}{^{-2}}$) is the reason why in some cases (for instance within the Solar system) the quantum vacuum can be neglected. Advanced experiments at CERN and forthcoming astronomical observations will reveal if this is true or not, but we point to already existing empirical evidence that seemingly supports this fascinating possibility.

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

scholarly journals Aspects of electrostatics in a weak gravitational field

2009 ◽  
Vol 42 (5) ◽  
pp. 1153-1181 ◽  
Author(s):  
Hamsa Padmanabhan ◽  
T. Padmanabhan
Keyword(s):  
Gravitational Field ◽  
Weak Gravitational Field

Ultra-weak gravitational field detected

Nature ◽  
2021 ◽  
Vol 591 (7849) ◽  
pp. 209-210
Author(s):  
Christian Rothleitner
Keyword(s):  
Gravitational Field ◽  
Weak Gravitational Field

scholarly journals Non-gravitational effects change the original 1/a-distribution of near-parabolic comets

2020 ◽  
Vol 633 ◽  
pp. A80 ◽  
Author(s):  
Małgorzata Królikowska
Keyword(s):  
Semimajor Axis ◽  
Oort Cloud ◽  
Gravitational Acceleration ◽  
Gravitational Effects ◽  
Long Period ◽  
Dynamical Properties ◽  
The Individual ◽  
Almost All ◽  
Data Processing Methods

Context. The original 1∕a-distribution is the only observational basis for the origin of long-period comets (LPCs) and the dynamical properties of the Oort Cloud. Although they are very subtle in the motion of these comets, non-gravitational effects can cause major changes in the original semimajor axis, 1∕aori. Aims. We obtained reliable non-gravitational orbits for as many LPCs with small perihelion distances of q < 3.1 au as possible, and determined the corresponding shape of the Oort spike. Methods. We determined the osculating orbits of each comet using several data-processing methods, and selected the preferred orbit using a few specific criteria. The distribution of 1∕aori for the whole comet sample was constructed using the individual Gaussian distribution we obtained for the preferred solution of each comet. Results. The derived distribution of 1∕aori for almost all known small-perihelion Oort spike comets was based on 64% of the non-gravitational orbits. This was compared with the distribution based on purely gravitational orbits, as well as with 1∕aori constructed earlier for LPCs with q > 3.1 au. We present a statistical analysis of the magnitudes of the non-gravitational acceleration for about 100 LPCs. Conclusions. The 1∕aori-distribution, which is based mainly on the non-gravitational orbits of small-perihelion Oort spike comets, is shifted by about 10 × 10−6 au−1 to higher values of 1∕aori compared with the distribution that is obtained when the non-gravitational effects on comet motion are ignored. We show the differences in the 1∕aori-distributions between LPCs with q < 3.1 au and those with q > 3.1 au. These findings indicate the important role of non-gravitational acceleration in the motion and origin of LPCs and in the formation of the Oort Cloud.

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