Two-parameter asymptotic forms for space-time Gaussian beams in an elastic medium

1991 ◽  
Vol 55 (3) ◽  
pp. 1705-1712 ◽  
Author(s):  
A. P. Kachalov
Keyword(s):  
Elastic Medium ◽  
Space Time ◽  
Gaussian Beams ◽  
Two Parameter ◽  
Asymptotic Forms

WORMHOLES OF K-ESSENCE IN ARBITRARY SPACE–TIME DIMENSIONS

2008 ◽  
Vol 23 (20) ◽  
pp. 3165-3175 ◽  
Author(s):  
J. ESTEVEZ-DELGADO ◽  
T. ZANNIAS
Keyword(s):  
Energy Momentum Tensor ◽  
Opposite Sign ◽  
Momentum Tensor ◽  
Space Time ◽  
Parameter Family ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Asymptotically Flat ◽  
Arbitrary Space ◽  
Two Parameter

We consider a K-essence involving a massless scalar field Φ minimally coupled to Einstein gravity in D ≥ 4 space–time dimensions. This theory admits a two-parameter family of spherical wormholes representing two asymptotically-flat universes connected via a (D-2)-dimensional spherical throat. The ADM masses of the two ends are unequal and of opposite sign except for a one-parameter family where both ends possess vanishing ADM masses. By cut and paste techniques, we construct a two-parameter family of wormholes where the ends possess equal and positive ADM masses but the throat is a (D-1)-dimensional thin-shell. The structure of the surface energy–momentum tensor is also analyzed.

Some results of the Barbier-Chalonge-Divan system of stellar classification

1966 ◽  
Vol 24 ◽  
pp. 77-90 ◽  
Author(s):  
D. Chalonge
Keyword(s):  
Early Type ◽  
Parameter System ◽  
Early Type Stars ◽  
Two Parameter

Several years ago a three-parameter system of stellar classification has been proposed (1, 2), for the early-type stars (O-G): it was an improvement on the two-parameter system described by Barbier and Chalonge (3).

Space, Time and Einstein

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