Symmetry in Einstein‐Maxwell Space‐Time

1972 ◽  
Vol 13 (10) ◽  
pp. 1469-1477 ◽  
Author(s):  
George Debney
Keyword(s):  
Space Time ◽  
Maxwell Space

scholarly journals Study of charged compact stars with class 1 metric under general relativity

2019 ◽  
Vol 97 (12) ◽  
pp. 1323-1331 ◽  
Author(s):  
S.K. Maurya ◽  
S. Roy Chowdhury ◽  
Saibal Ray ◽  
B. Dayanandan
Keyword(s):  
General Relativity ◽  
Compact Star ◽  
Space Time ◽  
Electron Cloud ◽  
Compact Stars ◽  
Stellar Structure ◽  
Spherically Symmetric ◽  
Class 1 ◽  
Maxwell Space ◽  
Physical Tests

In the present paper we study compact stars under the background of Einstein–Maxwell space–time, where the 4-dimensional spherically symmetric space–time of class 1 along with the Karmarkar condition has been adopted. The investigations, via the set of exact solutions, show several important results, such as (i) the value of density on the surface is finite; (ii) due to the presence of the electric field, the outer surface or the crust region can be considered to be made of electron cloud; (iii) the charge increases rapidly after crossing a certain cutoff region (r/R ≈ 0.3); and (iv) the avalanche of charge has a possible interaction with the particles that are away from the center. As the stellar structure supports all the physical tests performed on it, therefore the overall observation is that the model provides a physically viable and stable compact star.

scholarly journals Static Einstein–Maxwell space-time invariant by translation

2021 ◽  
Vol 53 (10) ◽  
Author(s):  
Benedito Leandro ◽  
Ana Paula de Melo ◽  
Ilton Menezes ◽  
Romildo Pina
Keyword(s):  
Space Time ◽  
Maxwell Space ◽  
Time Invariant

Taub numbers extended to Einstein–Maxwell space–time

1994 ◽  
Vol 35 (4) ◽  
pp. 1834-1839 ◽  
Author(s):  
E. N. Glass ◽  
Mark Naber
Keyword(s):  
Space Time ◽  
Maxwell Space

Exact solutions to Klein–Gordon and Weyl equations in a perfect-fluid Einstein–Maxwell space-time with local rotational symmetry

1991 ◽  
Vol 69 (6) ◽  
pp. 665-667 ◽  
Author(s):  
Umberto Percoco ◽  
Victor M. Villalba
Keyword(s):  
Exact Solutions ◽  
Perfect Fluid ◽  
Maxwell Equations ◽  
Rotational Symmetry ◽  
Space Time ◽  
Fluid Source ◽  
Maxwell Space ◽  
Klein Gordon

In this article we exhibit exact solutions of the Klein–Gordon and Weyl equations in a space-time homogeneous metric with local rotational symmetry, and the solutions of the Einstein–Maxwell equations with a perfect-fluid source and a sinusoidal electromagnetic configuration.

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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