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 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.

VERTEX OPERATORS FOR THE CLOSED BOSONIC STRING THEORY AT ARBITRARY GENUS IN THE OPERATOR FORMALISM

1990 ◽  
Vol 05 (12) ◽  
pp. 2391-2409 ◽  
Author(s):  
ADRIAN R. LUGO
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Integral Approach ◽  
Vertex Operators ◽  
Operator Formalism ◽  
Covariant Derivatives ◽  
Bosonic String Theory ◽  
Dilaton Coupling ◽  
Derivatives Of ◽  
Closed Bosonic String

A systematic procedure for constructing vertex operators for the physical states of the closed bosonic string theory at genus g in the operator formalism is presented. The method is based on imposing suitable commutation relations with the generators of the conformal transformations required by unitarity of scattering amplitudes. An Arakelov-type metric on the Riemann surface naturally arises in the case of the tachyon, which allows to define vertex operators at higher levels via covariant derivatives. They involve covariant derivatives of the curvature with respect to this metric as it happens in the path integral approach. As a particular result, the Fradkin-Tseytlin dilaton coupling is obtained.

Multiloop divergences in the closed bosonic string theory

1986 ◽  
Vol 168 (3) ◽  
pp. 207-211 ◽  
Author(s):  
E. Gava ◽  
R. Iengo ◽  
T. Jayaraman ◽  
R. Ramachandran
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Bosonic String Theory ◽  
Closed Bosonic String

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 The pomeron in closed bosonic string theory

2010 ◽  
Author(s):  
A. R. Fazio ◽  
Leonardo Angelini ◽  
Pietro Colangelo ◽  
Fulvia De Fazio ◽  
G. E. Bruno ◽  
...  
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Bosonic String Theory ◽  
Closed Bosonic String

scholarly journals TACHYON CONDENSATES AND ANISOTROPIC UNIVERSE

1995 ◽  
Vol 10 (03) ◽  
pp. 183-191 ◽  
Author(s):  
SWAPNA MAHAPATRA ◽  
SUDIPTA MUKHERJI
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Time Dependent ◽  
Anisotropic Universe ◽  
Cosmological Solutions ◽  
Bosonic String Theory ◽  
Closed Bosonic String

We investigate the cosmological solutions in closed bosonic string theory in the presence of nonzero tachyon condensate. We specifically obtain time-dependent solutions which describes an anisotropic universe. We also discuss the nature of such time-dependent solutions when small tachyon fluctuations around the condensate are taken into account.

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