Physics and simulation of light string propagation

2003 ◽  
Author(s):  
Jerome V.. Moloney ◽  
Miroslav Kolesik ◽  
Ewan M.. Wright
Keyword(s):  
String Propagation

scholarly journals ANISOTROPIC NULL STRING COSMOLOGIES

1998 ◽  
Vol 13 (39) ◽  
pp. 3169-3177 ◽  
Author(s):  
IOANNIS GIANNAKIS ◽  
K. KLEIDIS ◽  
A. KUIROUKIDIS ◽  
D. PAPADOPOULOS
Keyword(s):  
Equations Of Motion ◽  
String Tension ◽  
Perturbative Expansion ◽  
Speed Of Light ◽  
Zeroth Order ◽  
First Order ◽  
Cosmological Background ◽  
String Propagation ◽  
Analytical Expressions ◽  
Null String

We study string propagation in an anisotropic, cosmological background. We solve the equations of motion and the constraints by performing a perturbative expansion of the string coordinates in powers if c2 — the worldsheet speed of light. To zeroth order the string is approximated by a tensionless string (since c is proportional to the string tension T). We obtain exact, analytical expressions for the zeroth- and first-order solutions and we discuss some cosmological implications.

scholarly journals String Propagation in the Presence of Cosmological Singularities

2002 ◽  
Vol 2002 (06) ◽  
pp. 053-053 ◽  
Author(s):  
Ben Craps ◽  
David Kutasov ◽  
Govindan Rajesh
Keyword(s):  
String Propagation

scholarly journals THE TWO-DIMENSIONAL STRINGY BLACK HOLE: A NEW APPROACH AND A NEW EFFECT

1996 ◽  
Vol 11 (08) ◽  
pp. 1463-1488
Author(s):  
H.J. DE VEGA ◽  
J. RAMÍREZ MITTELBRUN ◽  
M. RAMÓN MEDRANO ◽  
N. SÁNCHEZ
Keyword(s):  
Black Hole ◽  
Physical Phenomenon ◽  
Type Equation ◽  
Scalar Particle ◽  
Conformal Anomaly ◽  
Massless Scalar ◽  
Two Dimensional ◽  
New Approach ◽  
Klein Gordon ◽  
String Propagation

The string propagation in the two-dimensional stringy black hole is investigated from a new approach. We completely solve the classical and quantum string dynamics in the Lorentzian and Euclidean regimes. In the Lorentzian case all the physics reduces to a massless scalar particle described by a Klein-Gordon type equation with a singular effective potential. The scattering matrix is found and it reproduces the results obtained by coset CFT techniques. It factorizes into two pieces: an elastic Coulombian amplitude and an absorption part. In both parts, an infinite sequence of imaginary poles in the energy appears. The generic features of string propagation in curved D-dimensional backgrounds (string stretching, fall into space-time singularities) are analyzed in the present case. A new physical phenomenon specific to the present black hole is found: the quantum renormalization of the speed of light. We find that [Formula: see text] where k is the integer in front of the WZW action. Only for k→∞ does this new effect disappear (although the conformal anomaly is present). We analyze all the classical Euclidean string solutions and exactly compute the quantum partition function. No critical Hagedorn temperature appears here.

String propagation in backgrounds with curved space-time

1991 ◽  
Vol 348 (1) ◽  
pp. 89-107 ◽  
Author(s):  
Itzhak Bars ◽  
Dennis Nemeschansky
Keyword(s):  
Space Time ◽  
Curved Space ◽  
String Propagation

REMARKS ON PROBLEMS OF COVARIANT QUANTIZATION OF SUPERPARTICLE AND SUPERSTRING

1990 ◽  
Vol 05 (19) ◽  
pp. 1505-1509 ◽  
Author(s):  
PARTHASARATHI MAJUMDAR
Keyword(s):  
Nonlinear Interactions ◽  
Covariant Quantization ◽  
Fixed Action ◽  
String Propagation

Inadequacies of the covariant quantization of the superparticle proposed sometime ago are re-examined. It is shown that there exists a nonsingular subset of the set of Nakanishi-Lautrup field redefinitions proposed earlier which renders the (partially) gauge fixed action free of nonlinear interactions. Implications for the free heterotic superstring and the σmodel describing string propagation in curved superspace are discussed.

DISC AND RP2 CORRECTIONS TO THE STRING EFFECTIVE LAGRANGIAN

1989 ◽  
Vol 04 (19) ◽  
pp. 5293-5319
Author(s):  
JAMES M. CLINE
Keyword(s):  
Effective Field Theory ◽  
Vertex Operator ◽  
Vacuum Energy ◽  
Brst Quantization ◽  
Effective Field ◽  
Exponential Form ◽  
Effective Lagrangian ◽  
Correct Ratio ◽  
String Propagation ◽  
Massless Fields

Bosonic string scattering amplitudes on the disc and the projective plane are compared with amplitudes from the effective field theory derived by demanding consistency of string propagation in background massless fields. Path integral (as opposed to BRST) quantization is used throughout, with the ghost fields integrated out. We point out a difficulty in defining a covariant dilaton vertex operator in this formalism. A nonstandard graviton vertex operator is constructed, by which we compute the vacuum energy for the two topologies and find that it has the correct ratio to the dilaton tadpole, as predicted by the effective Lagrangian. Factorization of tadpole divergences in N-point amplitudes leads to the same result, modulo a paradox discovered by Fischler, Klebanov, and Susskind, which is reviewed. We also show that the dilaton two- and three-point functions agree with the exponential form of the dilaton potential in the effective action, despite quadratic divergences that initially appear in these amplitudes.

FOUR-DIMENSIONAL TWO-BRANE SOLUTION IN CHIRAL GAUGED WESS-ZUMINO-WITTEN MODEL

1992 ◽  
Vol 07 (32) ◽  
pp. 2999-3006 ◽  
Author(s):  
SWAPNA MAHAPATRA
Keyword(s):  
Field Theory ◽  
Conformal Field Theory ◽  
Target Space ◽  
Curvature Singularity ◽  
One Dimensional ◽  
Conformal Field ◽  
Witten Theory ◽  
Brane Solution ◽  
The One ◽  
String Propagation

An exact conformal field theory describing a four-dimensional two-brane solution is found by considering a chiral gauged Wess-Zumino-Witten theory corresponding to SL (2, R)× R, where one gauges the one-dimensional U(1) subgroup together with a translation in R. The backgrounds for string propagation are explicitly obtained and the target space is shown to have a true curvature singularity.

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