scholarly journals Induced Light-Quark Yukawa Couplings as a Probe of Low-Energy Dynamics in QCD

1996 ◽  
Vol 96 (4) ◽  
pp. 781-786 ◽  
Author(s):  
M. R. Ahmady ◽  
V. Elias ◽  
A. H. Fariborz ◽  
R. R. Mendel
Keyword(s):  
Light Quark ◽  
Low Energy ◽  
Yukawa Couplings ◽  
Energy Dynamics

scholarly journals Generalized vanishing theorems for Yukawa couplings in heterotic compactifications

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Lara B. Anderson ◽  
James Gray ◽  
Magdalena Larfors ◽  
Matthew Magill ◽  
Robin Schneider
Keyword(s):  
Vector Bundles ◽  
Geometric Approach ◽  
Low Energy ◽  
Geometric Features ◽  
Vanishing Theorems ◽  
Vanishing Theorem ◽  
Alternative Derivation ◽  
Yukawa Couplings ◽  
Geometric Methods ◽  
Higher Dimensional

Abstract Heterotic compactifications on Calabi-Yau threefolds frequently exhibit textures of vanishing Yukawa couplings in their low energy description. The vanishing of these couplings is often not enforced by any obvious symmetry and appears to be topological in nature. Recent results used differential geometric methods to explain the origin of some of this structure [1, 2]. A vanishing theorem was given which showed that the effect could be attributed, in part, to the embedding of the Calabi-Yau manifolds of interest inside higher dimensional ambient spaces, if the gauge bundles involved descended from vector bundles on those larger manifolds. In this paper, we utilize an algebro-geometric approach to provide an alternative derivation of some of these results, and are thus able to generalize them to a much wider arena than has been considered before. For example, we consider cases where the vector bundles of interest do not descend from bundles on the ambient space. In such a manner we are able to highlight the ubiquity with which textures of vanishing Yukawa couplings can be expected to arise in heterotic compactifications, with multiple different constraints arising from a plethora of different geometric features associated to the gauge bundle.

Low-energy dynamics of the spin-gap magnet at the critical field

2007 ◽  
Vol 310 (2) ◽  
pp. e454-e456
Author(s):  
V.N. Glazkov ◽  
A.I. Smirnov ◽  
A. Kolezhuk ◽  
H. Tanaka ◽  
A. Oosawa
Keyword(s):  
Critical Field ◽  
Low Energy ◽  
Spin Gap ◽  
Energy Dynamics

scholarly journals The low energy dynamics of non-BPS branes

2000 ◽  
Author(s):  
Neil Lambert ◽  
I. Sachs
Keyword(s):  
Low Energy ◽  
Energy Dynamics

scholarly journals A KIND OF PREDICTION FROM STRING PHENOMENOLOGY: EXTRA MATTER AT LOW ENERGY

2007 ◽  
Vol 22 (14) ◽  
pp. 989-1003 ◽  
Author(s):  
CARLOS MUÑOZ
Keyword(s):  
Potential Problem ◽  
Low Energy ◽  
Mixing Angles ◽  
Yukawa Couplings ◽  
Problem Finding ◽  
String Phenomenology ◽  
Fermion Masses ◽  
Interesting Pattern ◽  
Low Energies ◽  
Crucial Ingredient

We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E8×E8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈g GUT × 5.27 × 1017 GeV ) and the value deduced from LEP experiments (≈2 × 1016 GeV ), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet–Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable level. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well-controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.

scholarly journals Low-energy dynamics of N = 2 supersymmetric monopoles

1994 ◽  
Vol 411 (2-3) ◽  
pp. 443-460 ◽  
Author(s):  
Jerome P. Gauntlett
Keyword(s):  
Low Energy ◽  
Energy Dynamics

Light-quark masses and QCD condensates from low-energy e+e− data: a nonconventional approach

1985 ◽  
Vol 90 (4) ◽  
pp. 378-387
Author(s):  
P. Loverre ◽  
G. Penso ◽  
C. Verzegnassi
Keyword(s):  
Light Quark ◽  
Low Energy ◽  
Quark Masses

scholarly journals MATRIX σ-MODELS FOR MULTI D-BRANE DYNAMICS

1998 ◽  
Vol 13 (11) ◽  
pp. 829-842 ◽  
Author(s):  
FEDELE LIZZI ◽  
NICK E. MAVROMATOS ◽  
RICHARD J. SZABO
Keyword(s):  
Field Theory ◽  
Quantum Dynamics ◽  
Open String ◽  
Effective Field ◽  
Low Energy ◽  
Target Space ◽  
Energy Dynamics ◽  
Space Action ◽  
Collective Coordinate ◽  
Genus Expansion

We describe a dynamical worldsheet origin for the Lagrangian describing the low-energy dynamics of a system of parallel D-branes. We show how matrix-valued collective coordinate fields for the D-branes naturally arise as couplings of a worldsheet σ-model, and that the quantum dynamics require that these couplings be mutually noncommutative. We show that the low-energy effective action for the σ-model couplings describes the propagation of an open string in the background of the multiple D-brane configuration, in which all string interactions between the constituent branes are integrated out and the genus expansion is taken into account, with a matrix-valued coupling. The effective field theory is governed by the non-Abelian Born–Infeld target space action which leads to the standard one for D-brane field theory.

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