scholarly journals (0, 2) Heterotic string compactifications from N=2 superconformal theories

1989 ◽  
Vol 227 (1) ◽  
pp. 34-40 ◽  
Author(s):  
A. Font ◽  
L.E. Ibáñez ◽  
M. Mondragón ◽  
G.G. Ross
Keyword(s):  
Heterotic String ◽  
String Compactifications ◽  
Superconformal Theories

A CLASS OF (0,0) NON-SUPERSYMMETRIC HETEROTIC STRING COMPACTIFICATIONS FROM N=2 MINIMAL SUPERCONFORMAL THEORIES WITH c=9

1995 ◽  
Vol 10 (09) ◽  
pp. 1249-1268
Author(s):  
AGAPITOS HATZINIKITAS
Keyword(s):  
Discrete Symmetries ◽  
Specific Model ◽  
Space Time ◽  
Heterotic String ◽  
Symmetry Groups ◽  
Affine Invariants ◽  
String Compactifications ◽  
Superconformal Theories ◽  
Quotient Groups ◽  
Chiral Superfields

Models which do not preserve N=1 space-time SUSY are constructed in the framework of tensoring of N=2 minimal superconformal theories quotiented by discrete symmetries. We concentrate on those models based on the standard [Formula: see text] affine invariants, and as quotient groups we use the Zk+2 symmetry groups of the minimal theories at level k. In our analysis we investigate the way in which the usual generalized GSO projection must be modified in order to incorporate discrete torsions responsible for the N=1 space-time breaking. We also determine the number of massless 27’s and [Formula: see text] of E6, and the number of chiral superfields transforming as singlets under E6. A discussion on the massless spectrum of a specific model reveals some interesting phenomenological implications.

scholarly journals Chern-Simons invariants and heterotic superpotentials

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Lara B. Anderson ◽  
James Gray ◽  
Andre Lukas ◽  
Juntao Wang
Keyword(s):  
Heterotic String ◽  
New Techniques ◽  
Vacuum Stability ◽  
Large Classes ◽  
Moduli Stabilization ◽  
String Compactifications ◽  
Key Features ◽  
Effective Theories ◽  
Chern Simons ◽  
Tangent Bundles

Abstract The superpotential in four-dimensional heterotic effective theories contains terms arising from holomorphic Chern-Simons invariants associated to the gauge and tangent bundles of the compactification geometry. These effects are crucial for a number of key features of the theory, including vacuum stability and moduli stabilization. Despite their importance, few tools exist in the literature to compute such effects in a given heterotic vacuum. In this work we present new techniques to explicitly determine holomorphic Chern-Simons invariants in heterotic string compactifications. The key technical ingredient in our computations are real bundle morphisms between the gauge and tangent bundles. We find that there are large classes of examples, beyond the standard embedding, where the Chern-Simons superpotential vanishes. We also provide explicit examples for non-flat bundles where it is non-vanishing and non-integer quantized, generalizing previous results for Wilson lines.

scholarly journals Hierarchical structure of physical Yukawa couplings from matter field Kähler metric

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Keiya Ishiguro ◽  
Tatsuo Kobayashi ◽  
Hajime Otsuka
Keyword(s):  
String Theory ◽  
Hierarchical Structure ◽  
Matter Field ◽  
Heterotic String ◽  
Heterotic String Theory ◽  
Kähler Metric ◽  
Yukawa Couplings ◽  
String Compactifications ◽  
Kahler Metric ◽  
Matter Fields

Abstract We study the impacts of matter field Kähler metric on physical Yukawa couplings in string compactifications. Since the Kähler metric is non-trivial in general, the kinetic mixing of matter fields opens a new avenue for realizing a hierarchical structure of physical Yukawa couplings, even when holomorphic Yukawa couplings have the trivial structure. The hierarchical Yukawa couplings are demonstrated by couplings of pure untwisted modes on toroidal orbifolds and their resolutions in the context of heterotic string theory with standard embedding. Also, we study the hierarchical couplings among untwisted and twisted modes on resolved orbifolds.

scholarly journals Threshold corrections in K3 × T2 heterotic string compactifications

1996 ◽  
Vol 482 (1-2) ◽  
pp. 187-210 ◽  
Author(s):  
Måns Henningson ◽  
Gregory Moore
Keyword(s):  
Heterotic String ◽  
String Compactifications

scholarly journals Higher-order gravitational couplings and modular forms in N = 2, D = 4 heterotic string compactifications

1996 ◽  
Vol 481 (1-2) ◽  
pp. 353-388 ◽  
Author(s):  
Bernard de Wit ◽  
Gabriel Lopes Cardoso ◽  
Dieter Lüst ◽  
Thomas Mohaupt ◽  
Soo-Jong Rey
Keyword(s):  
Modular Forms ◽  
Higher Order ◽  
Heterotic String ◽  
String Compactifications
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