Tree string generated corrections to Einstein gravity from the sigma model approach

1990 ◽  
Vol 22 (2) ◽  
pp. 193-202 ◽  
Author(s):  
S. V. Ketov
Keyword(s):  
Sigma Model ◽  
Einstein Gravity ◽  
Model Approach

scholarly journals Generalized nonlinear sigma model approach to alternating spin chains and ladders

2000 ◽  
Vol 14 (1) ◽  
pp. 47-52 ◽  
Author(s):  
M. Bocquet ◽  
Th. Jolicoeur
Keyword(s):  
Sigma Model ◽  
Spin Chains ◽  
Nonlinear Sigma Model ◽  
Model Approach

scholarly journals Superfield Hamiltonian quantization in terms of quantum antibrackets

2016 ◽  
Vol 31 (11) ◽  
pp. 1650054 ◽  
Author(s):  
Igor A. Batalin ◽  
Peter M. Lavrov
Keyword(s):  
Sigma Model ◽  
Equal Footing ◽  
Gauge Fixing ◽  
Actual Use ◽  
New Feature ◽  
Hamiltonian Quantization ◽  
Model Approach

We develop a new version of the superfield Hamiltonian quantization. The main new feature is that the BRST-BFV charge and the gauge fixing Fermion are introduced on equal footing within the sigma model approach, which provides for the actual use of the quantum/derived antibrackets. We study in detail the generating equations for the quantum antibrackets and their primed counterparts. We discuss the finite quantum anticanonical transformations generated by the quantum antibracket.

SIGMA MODEL APPROACH TO STRING THEORY

1989 ◽  
Vol 04 (06) ◽  
pp. 1257-1318 ◽  
Author(s):  
A.A. TSEYTLIN
Keyword(s):  
String Theory ◽  
Sigma Model ◽  
Equations Of Motion ◽  
Tree Approximation ◽  
Massless Fields ◽  
Model Approach

A review of the σ-model approach to derivation of effective string equations of motion for the massless fields is presented. We limit our consideration to the case of the tree approximation in the closed Bose string theory.

scholarly journals Sigma model approach to string theory effective actions with tachyons

2001 ◽  
Vol 42 (7) ◽  
pp. 2854-2871 ◽  
Author(s):  
A. A. Tseytlin
Keyword(s):  
String Theory ◽  
Sigma Model ◽  
Model Approach

scholarly journals A sigma-model approach to glassy dynamics

Pramana ◽  
2005 ◽  
Vol 64 (6) ◽  
pp. 1075-1085 ◽  
Author(s):  
Claudio Chamon ◽  
Leticia F. Cugliandolo
Keyword(s):  
Sigma Model ◽  
Glassy Dynamics ◽  
Model Approach

scholarly journals INFLATONLESS INFLATION

2012 ◽  
Vol 27 (25) ◽  
pp. 1250151 ◽  
Author(s):  
CHIU MAN HO ◽  
THOMAS W. KEPHART
Keyword(s):  
Extra Dimensions ◽  
Sigma Model ◽  
Einstein Gravity ◽  
Nonlinear Sigma Model ◽  
Ordinary Space

We consider a (4+N)-dimensional Einstein gravity coupled to a nonlinear sigma model. This theory admits a solution in which the N extra dimensions contract exponentially while the ordinary space expand exponentially. Physically, the nonlinear sigma fields induce the dynamical compactification of the extra dimensions, which in turn drives inflation. No inflatons are required.

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