COVARIANT BASIC OPERATORS IN BOSONIC STRING THEORY

1989 ◽  
Vol 04 (04) ◽  
pp. 857-871 ◽  
Author(s):  
G. CRISTOFANO ◽  
F. NICODEMI ◽  
R. PETTORINO
Keyword(s):  
String Theory ◽  
Vacuum Energy ◽  
Bosonic String ◽  
Covariant Formulation ◽  
Loop Level ◽  
Integration Measure ◽  
Bosonic String Theory

We discuss the covariant formulation of basic one-loop operators for the bosonic string using BRST invariant 3-Reggeon Vertex and propagator. In particular we discuss their automorphic structure and we give the construction of the vacuum energy and the tadpole operator at two-loop level writing explicitly the integration measure.

scholarly journals STRING-LOOP CORRECTIONS TO EFFECTIVE ACTION AND BLACK HOLE INSTABILITIES

1995 ◽  
Vol 10 (07) ◽  
pp. 575-585
Author(s):  
V. V. BELOKUROV ◽  
M. Z. IOFA
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Effective Action ◽  
Black Hole Solution ◽  
Bosonic String ◽  
Superstring Theory ◽  
Integration Measure ◽  
String Loop ◽  
Bosonic String Theory ◽  
Closed Bosonic String

Following the ideas of Ref. 3, to account for instability of 2-D black hole solution, we discuss possible imaginary string-loop corrections to the coefficient at the Einstein term in string effective action (EA). In closed bosonic string theory, such corrections appear because of the tachyon contribution to the integration measure over the moduli. In superstring theory, several possible sources of complex one-string-loop contributions to the EA are considered. It is argued that none of them can account for complex corrections to the Einstein term in the effective action.

HIGHER DIMENSIONAL COSMOLOGY WITH STRING VACUUM ENERGY

1987 ◽  
Vol 02 (05) ◽  
pp. 299-306 ◽  
Author(s):  
H. NISHIMURA ◽  
M. TABUSE
Keyword(s):  
String Theory ◽  
Vacuum Energy ◽  
Bosonic String ◽  
Extra Space ◽  
Higher Dimensional Cosmology ◽  
Higher Dimensional ◽  
Bosonic String Theory ◽  
The One ◽  
Closed Bosonic String

We consider higher dimensional cosmology based on the closed bosonic string theory with the one-loop vacuum energy. It is concluded that the winding-effect of strings around tori has a chance to prevent the extra space from expanding, even though the curvature of torus is zero.

scholarly journals ONE-LOOP VACUUM ENERGY IN NON-PARALLEL D1-BRANES: A PATH INTEGRAL FORMULATION

2010 ◽  
Vol 25 (08) ◽  
pp. 619-625 ◽  
Author(s):  
A. JAHAN
Keyword(s):  
String Theory ◽  
Path Integral ◽  
Integral Method ◽  
Vacuum Energy ◽  
Bosonic String ◽  
Integral Formulation ◽  
Path Integral Formulation ◽  
Bosonic String Theory ◽  
Path Integral Method ◽  
The One

We derive the one-loop vacuum energy of the bosonic string theory in a system of non-parallel D1-branes using the path integral method.

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 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 Effective action of bosonic string theory at order $$\alpha '^2$$

2019 ◽  
Vol 79 (10) ◽  
Author(s):  
Mohammad R. Garousi
Keyword(s):  
String Theory ◽  
Effective Action ◽  
Gauge Invariance ◽  
Bosonic String ◽  
Duality Transformations ◽  
S Matrix ◽  
Minimum Number ◽  
Bosonic String Theory

Abstract Recently, it has been shown that the gauge invariance requires the minimum number of independent couplings for B-field, metric and dilaton at order $$\alpha '^2$$α′2 to be 60. In this paper we fix the corresponding 60 parameters in string theory by requiring the couplings to be invariant under the global T-duality transformations. The Riemann cubed terms are exactly the same as the couplings that have been found by the S-matrix calculations.

scholarly journals Consistent superstrings as solutions of the D = 26 bosonic string theory

1985 ◽  
Vol 162 (1-3) ◽  
pp. 121-126 ◽  
Author(s):  
A. Casher ◽  
F. Englert ◽  
H. Nicolai ◽  
A. Taormina
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Bosonic String Theory
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