A heterotic standard model

By Volker Braun, Yang-Hui He, B. Ovrut, T. Pantev. 2005

274 citations recorded by the source corpus.

Within the context of the E_8 x E_8 heterotic superstring compactified on a smooth Calabi-Yau threefold with an SU(4) gauge instanton, we show the existence of simple, realistic N=1 supersymmetric vacua that are compatible with low energy particle physics. The observable sector of these vacua has gauge group SU(3)_C x SU(2)_L x U(1)_Y x U(1)_{B-L}, three families of quarks and leptons, each with an additional right-handed neutrino, two Higgs-Higgs conjugate pairs, a small number of uncharged moduli and no exotic matter. The hidden sector contains non-Abelian gauge fields and moduli. In the strong coupling case there is no exotic matter, whereas for weak coupling there are a small number of additional matter multiplets in the hidden sector. The construction exploits a mechanism for "splitting" multiplets. The minimal nature and rarity of these vacua suggest the possible theoretical and experimental relevance of spontaneously broken U(1)_{B-L} gauge symmetry and two Higgs-Higgs conjugate pairs. The U(1)_{B-L} symmetry helps to naturally suppress the rate of nucleon decay.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/93f5f305109148abd624a13fd9aeb6521a2bef2e

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In Nuclear and High Energy Physics

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Citations in the corpus

• Building the standard model on a D3-brane (2005, background): “In attempting to meet this dual challenge, string phenomenology traditionally adopts a “top-down” point of view, which aims to construct realistic compactification scenarios starting from the full 10-dimensional closed string theory [1] [ 2 ], possible augmented with one or more D-branes [3].”
• An SU(5) heterotic standard model (2005, unknown): “ these do not lead to the Standard Model gauge group since the latter cannot be obtained as a centralizer of Z2 × Z2 in the GUT gauge group Spin(10). Very recently, in an interesting series of papers [9, 10, 11, 12] a family of SU(4) bundles on a Calabi-Yau X with fundamental group π1(X) = Z3 × Z3 w”
• Two Hundred Heterotic Standard Models on Smooth Calabi-Yau Threefolds (2011, background): “The number of models constructed should be considered with the knowledge that to date, only 3 other smooth heterotic standard models have been produced in the literature [2, 5, 12].”
• Flux compactifications in string theory: A Comprehensive review (2005, background): “The attraction was therefore concentrated on flux-less Calabi-Yau or toroidal orbifold compactifications of the heterotic theory (with, however, vevs for internal fluxes, which break the gauge group to the Standard Model or GUT groups) [3].”
• Heterotic line bundle standard models (2012, background): “Only a relatively small number of models exhibiting a realistic massless spectrum have been constructed in this way [5, 6, 11, 18], reflecting the considerable technical problems associated with vector bundles on smooth Calabi-Yau manifolds.”
• Four-dimensional string compactifications with D-branes, orientifolds and fluxes (2006, methodology): “Using sophisticated mathematical tools for constructing both SU(5) [321, 325] and SO(10) [322, 323, 324] bundles, string models can be defined whose particle content comes remarkably close to the MSSM.”
• Ekpyrotic and cyclic cosmology (2008, background): “lds that can play a role, and there can be additional branes in the bulk. Such extra ingredients are usually necessary in order to obtain a realistic model of particle physics on the branes, see e.g. [16,21]. Here we focus on the simplest case of having only boundary branes, since we are interested ”
• Heterotic GUT and Standard Model vacua from simply connected Calabi–Yau manifolds (2006, unknown): “Corresponding realistic models from SU(5) and SO(10) GUTs in this context have been provided in [8] and [9,10], respectively.”
• Loop-corrected compactifications of the heterotic string with line bundles (2005, methodology): “Various mathematical constructions for such bundles have been applied, such as the monad construction occurring naturally in the framework of (0, 2) linear sigma models [6], the spectral cover construction [7] for elliptically fibered Calabi-Yau manifolds as they appear in studying F-theory duality ”