BEHAVIOR OF THE SCHWARZSCHILD SINGULARITY IN SUPERIMPOSED GRAVITATIONAL FIELDS

1966 ◽  
Vol 44 (3) ◽  
pp. 617-627 ◽  
Author(s):  
Lawrence Mysak ◽  
George Szekeres
Keyword(s):  
Time Dependent ◽  
Gravitational Fields ◽  
Coordinate Singularity ◽  
Singularity Time

The effect of superimposed gravitational fields upon the behavior of the Schwarzschild singularity is examined. It is shown that while static disturbances generally have no effect on the nature of the singularity, time-dependent disturbances of an assumed form convert it from a coordinate singularity into a true, coordinate-independent singularity.

scholarly journals Possible Alterations of Local Gravitational Field Inside a Superconductor

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 193 ◽  
Author(s):  
Giovanni Alberto Ummarino ◽  
Antonio Gallerati
Keyword(s):  
Gravitational Field ◽  
Landau Theory ◽  
Time Dependent ◽  
Qualitative Comparison ◽  
Ginzburg Landau ◽  
High Tc ◽  
Gravitational Fields ◽  
Favorable Conditions

We calculate the possible interaction between a superconductor and the static Earth’s gravitational fields, making use of the gravito-Maxwell formalism combined with the time-dependent Ginzburg–Landau theory. We try to estimate which are the most favorable conditions to enhance the effect, optimizing the superconductor parameters characterizing the chosen sample. We also give a qualitative comparison of the behavior of high–Tc and classical low–Tc superconductors with respect to the gravity/superfluid interplay.

Creation of particles by time-dependent gravitational fields

1979 ◽  
Vol 89 (1) ◽  
pp. 160-164 ◽  
Author(s):  
Mario Castagnino ◽  
Ricardo Weder
Keyword(s):  
Time Dependent ◽  
Gravitational Fields

scholarly journals Sub-Microarcsecond Astrometry and New Horizons in Relativistic Gravitational Physics

2000 ◽  
Vol 180 ◽  
pp. 303-307 ◽  
Author(s):  
Sergei M. Kopeikin ◽  
Carl R. Gwinn
Keyword(s):  
Gravitational Waves ◽  
Binary Stars ◽  
Light Propagation ◽  
Optical Resolution ◽  
Topological Defects ◽  
Time Dependent ◽  
Time Variability ◽  
Gravitational Lenses ◽  
Gravitational Fields ◽  
Relativistic Approach

AbstractAttaining the limit of sub-microarcsecond optical resolution will completely revolutionize fundamental astrometry by merging it with relativistic gravitational physics. Beyond the sub-microarcsecond threshold, one will meet in the sky a new population of physical phenomena caused by primordial gravitational waves from the early universe and/or different localized astronomical sources, space-time topological defects, moving gravitational lenses, time variability of gravitational fields of the solar system and binary stars, and many others. Adequate physical interpretation of these yet undetectable sub-microarcsecond phenomena cannot be achieved on the ground of the “standard” post-Newtonian approach (PNA), which is valid only in the near-zone of astronomical objects having a time-dependent gravitational field. We describe a new, post-Minkowskian relativistic approach for modeling astrometric observations having sub-microarcsecond precision and briefly discuss the light-propagation effects caused by gravitational waves and other phenomena related to time-dependent gravitational fields. The domain of applicability of the PNA in relativistic space astrometry is outlined explicitly.

scholarly journals Optimal estimation of time-dependent gravitational fields with quantum optomechanical systems

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Sofia Qvarfort ◽  
A. Douglas K. Plato ◽  
David Edward Bruschi ◽  
Fabienne Schneiter ◽  
Daniel Braun ◽  
...  
Keyword(s):  
Optimal Estimation ◽  
Time Dependent ◽  
Optomechanical Systems ◽  
Gravitational Fields ◽  
Estimation Of Time

scholarly journals Particle production in time-dependent gravitational fields: the expanding mass shell

2003 ◽  
Vol 20 (11) ◽  
pp. 2337-2353 ◽  
Author(s):  
Sabine Hossenfelder ◽  
Dominik J Schwarz ◽  
Walter Greiner
Keyword(s):  
Particle Production ◽  
Mass Shell ◽  
Time Dependent ◽  
Gravitational Fields

scholarly journals Exact treatment of time-dependent axisymmetric gravitation

1993 ◽  
Vol 440 (1910) ◽  
pp. 711-715 ◽  
Keyword(s):  
Exact Solution ◽  
Time Dependent ◽  
New Method ◽  
Vacuum Field ◽  
Axially Symmetric ◽  
Field Equations ◽  
Canonical Solution ◽  
Gravitational Fields ◽  
Einstein Vacuum

This paper extends an earlier treatment of time-dependent gravitational fields that are axially symmetric and non-rotating. From a consideration of the canonical solution of the Einstein vacuum field equations previously obtained as an axial expansion, a new method has been found that now provides the exact solution, whenever a certain generative key function X ( t , z ) is known.

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