scholarly journals Kinematic-Energy Measurements of the Torsion Tensor in Space-Time

2020 ◽  
Author(s):  
Francisco Bulnes ◽  
Isaías Martínez ◽  
Omar Zamudio ◽  
Edgar Navarro
Keyword(s):  
Torsion Tensor ◽  
Space Time

ARE THE COSMIC STRINGS SEEN AS THE DISLOCATIONS?

1991 ◽  
Vol 06 (24) ◽  
pp. 2237-2242 ◽  
Author(s):  
TAKEHIKO T. FUJISHIRO ◽  
MITSUO J. HAYASHI ◽  
SHOJI TAKESHITA
Keyword(s):  
Energy Density ◽  
Effective Action ◽  
Cosmic String ◽  
Cosmic Strings ◽  
Torsion Tensor ◽  
Space Time ◽  
Crystalline Solid ◽  
Dimensional Model ◽  
3 Dimensional ◽  
Deficit Angle

The effective action from the heterotic string compactification is studied on the manifolds with absolute parallelism. The cosmic string solutions resulting from the effective action are discussed in analogy with the dislocations in 3-dimensional crystalline solid. The cosmic string density is concluded to be given by the torsion tensor of space-time, which gives rise to a compactification at least in 1-dimensional direction in space-time. It is also shown that the contorsion tensor defines the deficit angle. We have found a stringy solution in a 6-dimensional model on M4 × T2 which coincides with that of Greene et al.,5 but the string energy density depends only on torsion, therefore independent of the space-time metric.

THE QUANTIZATION AND PRODUCTION OF THE SPACE–TIME DEFECTS IN THE EARLY UNIVERSE

1998 ◽  
Vol 13 (12) ◽  
pp. 2001-2012 ◽  
Author(s):  
YISHI DUAN ◽  
GUOHONG YANG ◽  
YING JIANG
Keyword(s):  
Early Universe ◽  
Torsion Tensor ◽  
Mapping Method ◽  
Space Time ◽  
Topological Invariant ◽  
Gauge Potential ◽  
Internal Space ◽  
Quantum Numbers ◽  
Dynamic Form ◽  
Conserved Current

In Riemann–Cartan manifold U4, a new topological invariant is obtained by means of the torsion tensor. In order to describe the space–time defects (which appear in the early universe due to torsion) in an invariant form, the new topological invariant is introduced to measure the size of defects and it is interpreted as the dislocation flux in internal space. By the use of the so-called ϕ mapping method and the gauge potential decomposition, the dislocation flux is quantized in units of the Planck length. The quantum numbers are determined by the Hopf indices and the Brouwer degrees. Furthermore, the dynamic form of the dislocations is studied by defining an identically conserved current. Based on the implicit function theorem, the production of the defects at the limit points is detailed.

scholarly journals A Torsion-Induced Coupling Between Electric and Magnetic Fields in the Solar Convection Zone

1993 ◽  
Vol 157 ◽  
pp. 269-270
Author(s):  
Metod Saniga
Keyword(s):  
Torsion Tensor ◽  
Space Time ◽  
Magnetic Vortex ◽  
Solar Convection Zone ◽  
Curved Space ◽  
Solar Convection ◽  
Formal Analogy ◽  
Type Ii Superconductor ◽  
Electric And Magnetic Fields ◽  
Complex Valued

A striking formal analogy between sunspots and the type II superconductor magnetic vortex has been pointed out by Saniga (1990). On the basis of this similarity, it was shown that, by postulating the existence of a complex-valued scalar field on the Sun (a “Higgs-like field”), many features of sunspots can be reproduced. Here this formal analogy is exploited further to show that the Abelian-Higgs sunspot acquires a non-zero electric charge in the background of a curved space-time endowed with a constant, completely antisymmetric torsion tensor. The space-time torsion is also shown to relate the spot's electric and magnetic fileds.

Space, Time and Einstein

2002 ◽  
Author(s):  
J. B. Kennedy
Keyword(s):  
Space Time

Spinors and Space-Time

1984 ◽  
Author(s):  
Roger Penrose ◽  
Wolfgang Rindler
Keyword(s):  
Space Time

Do Writing Directions Influence How People Map Space onto Time?

2018 ◽  
Vol 77 (4) ◽  
pp. 173-184
Author(s):  
Wenxing Yang ◽  
Ying Sun
Keyword(s):  
Mental Representations ◽  
Space Time ◽  
Horizontal Axis ◽  
Causal Role ◽  
Writing Systems ◽  
Temporal Cognition ◽  
Japanese Speakers ◽  
Psychological Experiments ◽  
Vertical Up

Abstract. The causal role of a unidirectional orthography in shaping speakers’ mental representations of time seems to be well established by many psychological experiments. However, the question of whether bidirectional writing systems in some languages can also produce such an impact on temporal cognition remains unresolved. To address this issue, the present study focused on Japanese and Taiwanese, both of which have a similar mix of texts written horizontally from left to right (HLR) and vertically from top to bottom (VTB). Two experiments were performed which recruited Japanese and Taiwanese speakers as participants. Experiment 1 used an explicit temporal arrangement design, and Experiment 2 measured implicit space-time associations in participants along the horizontal (left/right) and the vertical (up/down) axis. Converging evidence gathered from the two experiments demonstrate that neither Japanese speakers nor Taiwanese speakers aligned their vertical representations of time with the VTB writing orientation. Along the horizontal axis, only Japanese speakers encoded elapsing time into a left-to-right linear layout, which was commensurate with the HLR writing direction. Therefore, two distinct writing orientations of a language could not bring about two coexisting mental time lines. Possible theoretical implications underlying the findings are discussed.

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