On reggeon field theories and nonzero vacuum expectation values

1976 ◽  
Vol 15 (5) ◽  
pp. 157-160
Author(s):  
G. Venturi
Keyword(s):  
Vacuum Expectation ◽  
Field Theories ◽  
Expectation Values

scholarly journals RECONSTRUCTING THE STRING FIELD VACUUM

2006 ◽  
Vol 21 (12) ◽  
pp. 2527-2540 ◽  
Author(s):  
A. ILDERTON
Keyword(s):  
Vacuum Expectation ◽  
Vacuum State ◽  
Closed String ◽  
Field Theories ◽  
Expectation Values

The vacuum state functional of both open closed string field theories may be perturbatively reconstructed from the vacuum expectation values it must generate. We give the calculation of the first tree and one loop terms explicitly.

scholarly journals Closed superstring field theory and its applications

2017 ◽  
Vol 32 (28n29) ◽  
pp. 1730021 ◽  
Author(s):  
Corinne de Lacroix ◽  
Harold Erbin ◽  
Sitender Pratap Kashyap ◽  
Ashoke Sen ◽  
Mritunjay Verma
Keyword(s):  
Field Theory ◽  
Vacuum Expectation ◽  
Space Time ◽  
Field Theories ◽  
Quantum Corrections ◽  
Type Ii ◽  
Expectation Values ◽  
S Matrix ◽  
Recent Developments ◽  
Infrared Divergences

We review recent developments in the construction of heterotic and type II string field theories and their various applications. These include systematic procedures for determining the shifts in the vacuum expectation values of fields under quantum corrections, computing renormalized masses and S-matrix of the theory around the shifted vacuum and a proof of unitarity of the S-matrix. The S-matrix computed this way is free from all divergences when there are more than 4 noncompact space–time dimensions, but suffers from the usual infrared divergences when the number of noncompact space–time dimensions is 4 or less.

NORMALIZATION FACTORS IN CONFORMAL FIELD THEORY AND THEIR APPLICATIONS

2000 ◽  
Vol 15 (04) ◽  
pp. 259-270 ◽  
Author(s):  
V. A. FATEEV
Keyword(s):  
Vacuum Expectation ◽  
Field Theories ◽  
Quantum Field Theories ◽  
Quantum Field ◽  
Conformal Field Theories ◽  
Expectation Values ◽  
Conformal Field ◽  
Cylindrically Symmetric ◽  
Toda Equations ◽  
Normalization Factors

We calculate the normalization factors and reflection amplitudes in the W-invariant conformal quantum field theories. Using these CFT data we derive vacuum expectation values of exponential fields in affine Toda theories and related perturbed conformal field theories. We also calculate the asymptotics of cylindrically symmetric solutions of the classical Toda equations.

INTERACTING QUANTUM FIELDS

1999 ◽  
Vol 11 (07) ◽  
pp. 881-928 ◽  
Author(s):  
GLENN ERIC JOHNSON
Keyword(s):  
Perturbation Expansion ◽  
Vacuum Expectation ◽  
Function Class ◽  
Generalized Functions ◽  
Field Theories ◽  
Quantum Field Theories ◽  
Quantum Field ◽  
Quantum Fields ◽  
Expectation Values ◽  
Limited Function

A wide class of quantum field theories (QFTs) describing interacting neutral scalar bosons are constructed. It is shown that a redefinition of the vacuum expectation values (VEV) of quantum fields as generalized functions leads to constructions of interacting fields that are operators in a Hilbert space and satisfy the physical requirements for a field theory. The field operators are constructed directly, without perturbation expansion, and constructed in spacetime of any number of dimensions. The corresponding scattering theory is developed. The limited function class underlying the QFT imposes a direction to time.

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