scholarly journals Traversable Lorentzian wormholes in the vacuum low energy effective string theory in Einstein and Jordan frames

2004 ◽  
Vol 70 (4) ◽  
Author(s):  
K. K. Nandi ◽  
Yuan-Zhong Zhang
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Effective String Theory

scholarly journals Cosmological and wormhole solutions in low-energy effective string theory

1994 ◽  
Vol 50 (10) ◽  
pp. 6435-6443 ◽  
Author(s):  
Mariano Cadoni ◽  
Marco Cavaglià
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Effective String Theory

scholarly journals Instability of theR3×S1vacuum in low-energy effective string theory

1995 ◽  
Vol 52 (4) ◽  
pp. 2583-2586
Author(s):  
Mariano Cadoni ◽  
Marco Cavaglià
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Effective String Theory

ENERGY-MOMENTUM COMPLEXES FOR A STRINGY BLACK HOLE GEOMETRY IN A LOW-ENERGY EFFECTIVE STRING THEORY

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1606-1609 ◽  
Author(s):  
I. RADINSCHI ◽  
TH. GRAMMENOS
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Momentum Distribution ◽  
Low Energy ◽  
Scalar Charge ◽  
Momentum Distributions ◽  
Hole Geometry ◽  
Energy And Momentum ◽  
Effective String Theory

The energy and momentum distributions for a four-dimensional, magnetically charged, stringy black hole geometry, in a low-energy effective string theory, are calculated. To this purpose, the energy-momentum complexes of Einstein, Landau-Lifshitz, Weinberg and Møller are applied. It is found that, in all four prescriptions, the momentum distribution vanishes, while the energies obtained differ, but all are functions of the mass, the scalar charge, and the boost parameter.

scholarly journals GRAVITY ON NONCOMMUTATIVE D-BRANES

2003 ◽  
Vol 18 (07) ◽  
pp. 1051-1066 ◽  
Author(s):  
F. ARDALAN ◽  
H. ARFAEI ◽  
M. R. GAROUSI ◽  
A. GHODSI
Keyword(s):  
String Theory ◽  
Effective Action ◽  
Low Energy ◽  
Bosonic String ◽  
First Order ◽  
Energy Scattering ◽  
Bosonic String Theory ◽  
Brane Action

The effective action for the low energy scattering of two gravitons with a D-brane in the presence of a constant antisymmetric B field in bosonic string theory is calculated and the modification to the standard D-brane action to first order in α′ is obtained.

scholarly journals STRINGS, NONCOMMUTATIVE GEOMETRY AND THE SIZE OF THE TARGET SPACE

1999 ◽  
Vol 14 (28) ◽  
pp. 4501-4517 ◽  
Author(s):  
FEDELE LIZZI
Keyword(s):  
String Theory ◽  
Dirac Operator ◽  
Noncommutative Geometry ◽  
Low Energy ◽  
Target Space ◽  
World Sheet ◽  
Crucial Point ◽  
Spectral Action ◽  
Energy Eigenvalues ◽  
The World

We describe how the presence of the antisymmetric tensor (torsion) on the world sheet action of string theory renders the size of the target space a gauge noninvariant quantity. This generalizes the R ↔ 1/R symmetry in which momenta and windings are exchanged, to the whole O(d,d,ℤ). The crucial point is that, with a transformation, it is possible always to have all of the lowest eigenvalues of the Hamiltonian to be momentum modes. We interpret this in the framework of noncommutative geometry, in which algebras take the place of point spaces, and of the spectral action principle for which the eigenvalues of the Dirac operator are the fundamental objects, out of which the theory is constructed. A quantum observer, in the presence of many low energy eigenvalues of the Dirac operator (and hence of the Hamiltonian) will always interpreted the target space of the string theory as effectively uncompactified.

scholarly journals STRING COSMOLOGY AND CHAOS

2004 ◽  
Vol 19 (10) ◽  
pp. 1499-1509
Author(s):  
THIBAULT DAMOUR
Keyword(s):  
String Theory ◽  
Coming Out ◽  
String Cosmology ◽  
Low Energy ◽  
Weyl Groups ◽  
Tree Level ◽  
Cosmological Solutions

We briefly review two aspects of string cosmology: (1) the presence of chaos in the generic cosmological solutions of the tree-level low-energy effective actions coming out of string theory, and (2) the remarkable link between the latter chaos and the Weyl groups of some hyperbolic Kac–Moody algebras.

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