scholarly journals The boundary state formalism and conformal invariance in off-shell string theory

2003 ◽  
Vol 2003 (11) ◽  
pp. 021-021 ◽  
Author(s):  
Mark Laidlaw ◽  
Gordon W Semenoff
Keyword(s):  
String Theory ◽  
Conformal Invariance ◽  
Boundary State

Conformal invariance and string theory in compact space: Bosons

1985 ◽  
Vol 32 (10) ◽  
pp. 2713-2721 ◽  
Author(s):  
Sanjay Jain ◽  
R. Shankar ◽  
Spenta R. Wadia
Keyword(s):  
String Theory ◽  
Compact Space ◽  
Conformal Invariance

scholarly journals Brane with transverse rotation and background fields: boundary state and tachyon condensation

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Davoud Kamani
Keyword(s):  
String Theory ◽  
Tachyon Condensation ◽  
Internal Field ◽  
Open String ◽  
Bosonic String ◽  
Boundary State ◽  
Bosonic String Theory ◽  
Transverse Rotation ◽  
Background Fields

Abstract The boundary state corresponding to the Dp-brane with a transverse rotation in the presence of the Kalb–Ramond and tachyon background fields and a U(1) internal field will be constructed. We shall investigate effects of the open string tachyon condensation on this brane via its boundary state. We demonstrate that the background fields and transverse rotation cannot protect the brane against the collapse. Our calculations are in the context of the bosonic string theory.

scholarly journals Conformal invariance, supersymmetry and string theory

1986 ◽  
Vol 271 (3-4) ◽  
pp. 93-165 ◽  
Author(s):  
Daniel Friedan ◽  
Emil Martinec ◽  
Stephen Shenker
Keyword(s):  
String Theory ◽  
Conformal Invariance

scholarly journals Conformal invariance, supersymmetry and string theory

1986 ◽  
Vol 271 (1) ◽  
pp. 93-165 ◽  
Author(s):  
Daniel Friedan ◽  
Emil Martinec ◽  
Stephen Shenker
Keyword(s):  
String Theory ◽  
Conformal Invariance

scholarly journals Conformal invariance and the metrication of the fundamental forces

2016 ◽  
Vol 25 (12) ◽  
pp. 1644003 ◽  
Author(s):  
Philip D. Mannheim
Keyword(s):  
String Theory ◽  
Conformal Invariance ◽  
Vector Fields ◽  
Axial Vector ◽  
Gravitational Theory ◽  
Einstein Gravity ◽  
Conformal Gravity ◽  
Yang Mills ◽  
Standard Picture ◽  
Fundamental Forces

We revisit Weyl’s metrication (geometrization) of electromagnetism. We show that by making Weyl’s proposed geometric connection be pure imaginary, not only are we able to metricate electromagnetism, an underlying local conformal invariance makes the geometry be strictly Riemannian and prevents observational gravity from being complex. Via torsion, we achieve an analogous metrication for axial-vector fields. We generalize our procedure to Yang–Mills theories, and achieve a metrication of all the fundamental forces. Only in the gravity sector does our approach differ from the standard picture of fundamental forces, with our approach requiring that standard Einstein gravity be replaced by conformal gravity. We show that quantum conformal gravity is a consistent and unitary quantum gravitational theory, one that, unlike string theory, only requires four spacetime dimensions.

scholarly journals DISCONTINUITIES AND COLLISION OF GRAVITATIONAL WAVES IN STRING THEORY

1995 ◽  
Vol 10 (33) ◽  
pp. 2531-2542 ◽  
Author(s):  
ALEXANDROS A. KEHAGIAS ◽  
E. PAPANTONOPOULOS
Keyword(s):  
String Theory ◽  
Gravitational Waves ◽  
Conformal Invariance ◽  
Antisymmetric Tensor ◽  
Dilaton Field ◽  
Plane Gravitational Waves

We examine here discontinuities in the metric, the antisymmetric tensor and the dilaton field which are allowed by conformal invariance. We find that the surfaces of discontinuity must necessarily be null and both shock and impulsive waves are allowed. We employ our results for the case of colliding plane gravitational waves and we discuss the SL(2, [Formula: see text]) × SU(2)/[Formula: see text] × [Formula: see text]WZW model in the present perspective. In particular, the singularities encountered in this model may be viewed as the result of the mutual focusing of the colliding waves.

scholarly journals THE ROLE OF QUANTIZED 2-DIM. GRAVITY IN STRING THEORY

1990 ◽  
Vol 05 (11) ◽  
pp. 863-876 ◽  
Author(s):  
AVINASH DHAR ◽  
T. JAYARAMAN ◽  
K. S. NARAIN ◽  
SPENTA R. WADIA
Keyword(s):  
String Theory ◽  
Time Dependence ◽  
Current Algebra ◽  
Conformal Invariance ◽  
Arbitrary Number ◽  
Central Charge ◽  
Vertex Operators ◽  
Extra Time ◽  
Reparametrization Invariance

We present a formulation of string theory in which the 2-dim. metric is exactly quantized in the framework of SL (2, R) current algebra. In this way we replace the conformal invariance prescription by the principle of reparametrization invariance. The theory is formulated in arbitrary number of dimensions since the usual restriction of fixed matter central charge is not present. As a concrete illustration of our approach, we show that in 25 Euclidean dimensions the usual amplitudes of the 26-dimensional bosonic string theory arise. The extra time-like dimension emerges as a mode of the 2-dim. metric and the gravitational dressing of vertex operators gives rise to their time dependence.

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