scholarly journals Dilaton stabilization in three-generation heterotic string model

2016 ◽  
Vol 760 ◽  
pp. 63-68 ◽  
Author(s):  
Florian Beye ◽  
Tatsuo Kobayashi ◽  
Shogo Kuwakino
Keyword(s):  
String Model ◽  
Heterotic String

ONE-LOOP AMPLITUDES IN THE HETEROTIC STRING

1988 ◽  
Vol 03 (01) ◽  
pp. 243-266 ◽  
Author(s):  
P. JETZER ◽  
J. LACKI ◽  
L. MIZRACHI
Keyword(s):  
String Model ◽  
Heterotic String ◽  
Modular Invariance ◽  
Gauge Bosons ◽  
Massless Particles ◽  
The One ◽  
Loop Amplitudes

We calculate the one-loop amplitudes for the emission of four massless particles in the heterotic string model. In particular, we consider the amplitudes involving four gravitons and gauge bosons supermultiplets as well as those for the mixed processes. We also discuss their modular invariance and finiteness.

THE (4, 0) HETEROTIC STRING WITH WESS-ZUMINO TERM

1986 ◽  
Vol 01 (03) ◽  
pp. 191-201 ◽  
Author(s):  
E. BERGSHOEFF ◽  
E. SEZGIN
Keyword(s):  
String Model ◽  
Heterotic String ◽  
Gauge Fields ◽  
Yang Mills

The covariant SU(2) spinning string model of Pernici and van Nieuwenhuizen which has (4, 4) supersymmetry is chirally truncated to a (4, 0) model. The model is extended by the addition of a locally supersymmetric Wess-Zumino term, and heterotic fermions. This system is coupled to composite as well as fundamental Yang-Mills gauge fields.

scholarly journals Top quark mass in exophobic Pati–Salam heterotic string model

2011 ◽  
Vol 702 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Kyriakos Christodoulides ◽  
Alon E. Faraggi ◽  
John Rizos
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
String Model ◽  
Heterotic String ◽  
Top Quark Mass

scholarly journals TOWARDS A COMPLETE TWISTORIZATION OF THE HETEROTIC STRING

1994 ◽  
Vol 09 (32) ◽  
pp. 2987-2997 ◽  
Author(s):  
IGOR A. BANDOS ◽  
DMITRIJ V. VOLKOV ◽  
MARTIN CEDERWALL ◽  
DMITRIJ P. SOROKIN
Keyword(s):  
String Model ◽  
Space Time ◽  
Heterotic String ◽  
Virasoro Constraints

In D = 3, 4, 6 and 10 space-time dimensions considered is a string model invariant under transformations of N = 1 space-time supersymmetry and n = D − 2 local worldsheet supersymmetry with both the Virasoro constraints solved in the twistor form. The twistor solution survives in a modified form even in the presence of the heterotic fermions.

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.

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