Cosmological equivalence between the Finsler-Randers space-time and the DGP gravity model

2013 ◽  
Vol 87 (4) ◽  
Author(s):  
Spyros Basilakos ◽  
Panayiotis Stavrinos
Keyword(s):  
Gravity Model ◽  
Space Time ◽  
Randers Space

HIERARCHY IN HOŘAVA-LIKE GRAVITY

2011 ◽  
Vol 26 (16) ◽  
pp. 2795-2805 ◽  
Author(s):  
YU-LEI FENG ◽  
LI-XIN XU ◽  
YU-TING WANG
Keyword(s):  
Critical Exponent ◽  
Gravity Model ◽  
Space Dimension ◽  
Dimensional Space ◽  
Space Time ◽  
Mass Hierarchy ◽  
Factor Solution ◽  
Exponential Factor ◽  
Extra Space ◽  
Dimensional Space Time

We investigate a Hořava-like gravity model in (4+1)-dimensional space–time. Differing from the original one, we put a critical exponent z to the extra space dimension, which preserves the 4-dimensional diffeomorphism. Surprisingly, we obtain a mass hierarchy [Formula: see text] in a way completely different from the Randall–Sundrum model, we also obtain an exponential factor solution with the use of Ricci-like flow. More interesting relations with AdS5/CFT4 are further demonstrated. Since AdS/CFT is a realization of holography, we conclude that the Hořava-like gravity may be also a realization of holography.

scholarly journals LAGRANGE FORMULATION OF THE SYMMETRIC TELEPARALLEL GRAVITY

2006 ◽  
Vol 15 (05) ◽  
pp. 619-634 ◽  
Author(s):  
M. ADAK ◽  
M. KALAY ◽  
Ö. SERT
Keyword(s):  
Gravity Model ◽  
Teleparallel Gravity ◽  
Space Time ◽  
De Sitter ◽  
Lagrange Formulation

We develop a symmetric teleparallel gravity model in a space–time with only the nonmetricity as nonzero, in terms of a Lagrangian quadratic in the nonmetricity tensor. We present a detailed discussion of the variations that may be used for any gravitational formulation. We seek Schwarzschild-type solutions because of its observational significance and obtain a class of solutions that includes Schwarzschild-type, Schwarzschild–de Sitter-type, and Reissner–Nordström-type solutions for certain values of the parameters. We also discuss the physical relevance of these solutions.

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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