scholarly journals Quantum deformations of space-time symmetries with fundamental mass parameter

2007 ◽  
pp. 299-303
Author(s):  
J. Lukierski
Keyword(s):  
Mass Parameter ◽  
Space Time ◽  
Quantum Deformations ◽  
Fundamental Mass

scholarly journals Quantum deformations of conformal algebras introducing fundamental mass parameters

1996 ◽  
Vol 371 (3-4) ◽  
pp. 215-222 ◽  
Author(s):  
Jerzy Lukierski ◽  
Pierre Minnaert ◽  
Marek Mozrzymas
Keyword(s):  
Conformal Algebras ◽  
Quantum Deformations ◽  
Fundamental Mass

Modeling Excavation Damaged Zone for Rock Mass Parameter Identification of Underground Engineering

2014 ◽  
Vol 1065-1069 ◽  
pp. 437-441
Author(s):  
Hui Bo Liu ◽  
Zhi Guo Zhang ◽  
Chan Ge Liu ◽  
Ming Xiao
Keyword(s):  
Rock Mass ◽  
Parameter Identification ◽  
Mass Parameter ◽  
Deformation Modulus ◽  
Space Time ◽  
Mechanism Analysis ◽  
Underground Engineering ◽  
Feedback Analysis ◽  
Excavation Damaged Zone ◽  
Damaged Zone

Space-time effect of excavation damaged zone (EDZ) has great impact on identifying rock mass parameters in underground excavation engineering. In this paper, methods and models for simulating EDZ are reviewed and classified. Based on mechanism analysis, a practical model using radius-displacement-dependent deformation modulus is proposed for dynamic excavation feedback analysis. In the model, EDZ is viewed as a three dimensional heterogeneous and variable disturbing field of parameter during excavation process. Thus, deformation modulus of EDZ rock mass evolves with space-time change along with construction stages. The model is proved to be available in parameter identification for rapid feedback analysis of underground engineering.

scholarly journals On the global Structure of Robinson–Trautman space-times

1992 ◽  
Vol 436 (1897) ◽  
pp. 299-316 ◽  
Keyword(s):  
Event Horizon ◽  
Mass Parameter ◽  
Space Time ◽  
Global Structure ◽  
Time Behaviour ◽  
Event Horizons ◽  
Long Time Behaviour ◽  
Nonlinear Parabolic ◽  
Long Time ◽  
Higher Genus

The global structure of Robinson–Trautman space-times is studied. When the space-time topology is R + x R x S 2 it is shown that all Robinson–Trautman space-time can be C 117 extended (in the vacuum Robinson–Trautman class of metrics) beyond the r = 2 m 'Schwarzschild-like' event horizon; evidence is given supporting the conjecture, that no smooth extensions beyond the r = 2 m event horizon exist unless the metric is the Schwarzschild one. When the space-time topology is R + x R x 2 M , with 2 M a higher genus surface, and the mass parameter m is negative, Schwarzchild-like event horizons are shown to occur. The Proofs of these results are based on the derivation of a detailed asymptotic expansion describing the long-time behaviour of the solutions of a nonlinear parabolic equation.

scholarly journals Quantum Deformations of Space-Time Susy and Noncommutative Superfield Theory

2001 ◽  
pp. 79-91 ◽  
Author(s):  
P. Kosiński ◽  
Jerzy Lukierski ◽  
P. Maślanka
Keyword(s):  
Space Time ◽  
Quantum Deformations

scholarly journals Null geodesics and red–blue shifts of photons emitted from geodesic particles around a noncommutative black hole space–time

2018 ◽  
Vol 33 (16) ◽  
pp. 1850098 ◽  
Author(s):  
Ravi Shankar Kuniyal ◽  
Rashmi Uniyal ◽  
Anindya Biswas ◽  
Hemwati Nandan ◽  
K. D. Purohit
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Noncommutative Geometry ◽  
Equatorial Plane ◽  
Mass Parameter ◽  
Space Time ◽  
Geodesic Motion ◽  
Schwarzschild Black Hole ◽  
Gravitational Fields ◽  
Test Particles

We investigate the geodesic motion of massless test particles in the background of a noncommutative geometry-inspired Schwarzschild black hole. The behavior of effective potential is analyzed in the equatorial plane and the possible motions of massless particles (i.e. photons) for different values of impact parameter are discussed accordingly. We have also calculated the frequency shift of photons in this space–time. Further, the mass parameter of a noncommutative inspired Schwarzschild black hole is computed in terms of the measurable redshift of photons emitted by massive particles moving along circular geodesics in equatorial plane. The strength of gravitational fields of noncommutative geometry-inspired Schwarzschild black hole and usual Schwarzschild black hole in General Relativity is also compared.

Space, Time and Einstein

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

Space-Time Block Coding for Wireless Communications

2003 ◽  
Author(s):  
Erik G. Larsson ◽  
Petre Stoica
Keyword(s):  
Wireless Communications ◽  
Space Time ◽  
Time Block ◽  
Block Coding ◽  
Space Time Block Coding

Spinors and Space-Time

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

Space-Time Wireless Systems

2001 ◽  
Keyword(s):  
Wireless Systems ◽  
Space Time
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