Construction of Fermionic String Models in Four Dimensions

1989 ◽  
pp. 283-358
Author(s):  
Hikaru KAWAI ◽  
David C. LEWELLEN ◽  
S.-H. Henry TYE
Keyword(s):  
Four Dimensions ◽  
Fermionic String ◽  
String Models

Construction of fermionic string models in four dimensions

1987 ◽  
Vol 288 ◽  
pp. 1-76 ◽  
Author(s):  
Hikaru Kawai ◽  
David C. Lewellen ◽  
S.-H. Henry Tye
Keyword(s):  
Four Dimensions ◽  
Fermionic String ◽  
String Models

FERMIONIC STRING MODELS AND ZN ORBIFOLDS

1989 ◽  
Vol 04 (24) ◽  
pp. 2339-2347 ◽  
Author(s):  
DAVID C. DUNBAR
Keyword(s):  
Boundary Conditions ◽  
World Sheet ◽  
Fermionic String ◽  
String Models ◽  
Special Case

It is shown that ZN orbifold models may, in special case be realised by a set world sheet fermions which have boundary conditions which are non-diagonal.

Classification of closed-fermionic-string models

1986 ◽  
Vol 34 (12) ◽  
pp. 3794-3804 ◽  
Author(s):  
H. Kawai ◽  
D. C. Lewellen ◽  
S. -H. H. Tye
Keyword(s):  
Fermionic String ◽  
String Models

scholarly journals Construction of Four-Dimensional Fermionic String Models

1986 ◽  
Vol 57 (15) ◽  
pp. 1832-1835 ◽  
Author(s):  
Hikaru Kawai ◽  
David C. Lewellen ◽  
S. -H. Henry Tye
Keyword(s):  
Fermionic String ◽  
String Models

CONSTRUCTION OF FOUR DIMENSIONAL FERMIONIC STRING MODELS WITH A GENERALIZED SUPERCURRENT

1988 ◽  
Vol 03 (01) ◽  
pp. 279-284 ◽  
Author(s):  
HIKARU KAWAI ◽  
DAVID C. LEWELLEN ◽  
S.-H. HENRY TYE
Keyword(s):  
Spin Structure ◽  
Model Building ◽  
World Sheet ◽  
The World ◽  
Fermionic String ◽  
String Models

The spin structure construction of four-dimensional fermionic string models of the heterotic type is extended by considering a generalized form of the world-sheet super-current. The rules for model building are given and illustrated with two sets of examples: the original spin structure construction and the Z3 asymmetric orbifold.

scholarly journals Construction of Four-Dimensional Fermionic String Models

1987 ◽  
Vol 58 (4) ◽  
pp. 429-429 ◽  
Author(s):  
Hikaru Kawai ◽  
David C. Lewellen ◽  
S. -H. Henry Tye
Keyword(s):  
Fermionic String ◽  
String Models

scholarly journals Quantum Decoherence in a Four-Dimensional Black Hole Background

1997 ◽  
Vol 12 (04) ◽  
pp. 243-256 ◽  
Author(s):  
John Ellis ◽  
N. E. Mavromatos ◽  
Elizabeth Winstanley ◽  
D. V. Nanopoulos
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Density Matrix ◽  
Scalar Particle ◽  
Quantum Decoherence ◽  
Logarithmic Divergence ◽  
Four Dimensions ◽  
Black Hole Background ◽  
Order Of Magnitude ◽  
String Models

We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein–Yang–Mills black hole in four dimensions. This divergence is related to a previously-found logarithmic divergence in the entropy of the scalar field, which cannot be absorbed into a renormalization of the Hawking–Bekenstein entropy of the black hole. Motivated by the fact that the cutoff in this divergence varies as the latter decays, by an analysis of black holes in two-dimensional string models and by studies of D-brane dynamics in higher dimensions, we propose that the renormalization scale variable be identified with time. In this case, the logarithmic divergence we find induces a non-commutator term [Formula: see text] in the quantum Liouville equation for the time evolution of the density matrix ρ of the scalar field, leading to quantum decoherence. The order of magnitude of [Formula: see text] is μ2/M P , where μ is the mass of the scalar particle.

scholarly journals A MINIMAL SUPERSTRING STANDARD MODEL I: FLAT DIRECTIONS

2001 ◽  
Vol 16 (03) ◽  
pp. 425-482 ◽  
Author(s):  
G. B. CLEAVER ◽  
A. E. FARAGGI ◽  
D. V. NANOPOULOS
Keyword(s):  
Effective Field Theory ◽  
String Model ◽  
Effective Field ◽  
Supersymmetric Model ◽  
Large Set ◽  
Exotic Particles ◽  
Exotic States ◽  
Fermionic String ◽  
String Models ◽  
Minimal Supersymmetric Model

Three family SU (3)C× SU (2)L× U (1)Y string models in several constructions generically possess two features: (i) an extra local anomalous U (1)A and (ii) numerous (often fractionally charged) exotic particles beyond those in the minimal supersymmetric model (MSSM). Recently, we demonstrated that the observable sector effective field theory of such a free fermionic string model can reduce to that of the MSSM, with the standard observable gauge group being just SU (3)C× SU (2)L× U (1)Y and the SU (3)C× SU (2)L× U (1)Y-charged spectrum of the observable sector consisting solely of the MSSM spectrum. An example of a model with this property was shown. We continue our investigation of this model by presenting a large set of different flat directions of the same model that all produce the MSSM spectrum. Our results suggest that even after imposing the conditions for the decoupling of exotic states, there may remain sufficient freedom to satisfy the remaining phenomenological constraints imposed by the observed data.

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