Physics Letters B

2005

DOI: 10.1016/j.physletb.2005.05.007

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A heterotic standard model

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Introduction2

Avoidance Of Relics1

A Topological Obstruction1

Metastable Heterotic Strings1

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2006

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Cited by 247 publications

(526 citation statements)

References 35 publications

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“…VI A. 12 Although the phase issue may still be an open one, the monopole question can possibly be solved in a string theory context since the effective field theory which emerges as its low-energy limit is in general not based on a simply connected GUT group, so that the relevant symmetry-breaking scheme may not include monopole formation [331][332][333]. smoothens and flattens the universe.…”

Section: Avoidance Of Relicsmentioning

confidence: 99%

A critical review of classical bouncing cosmologies

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2015

Physics Reports

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Given the proliferation of bouncing models in recent years, we gather and critically assess these proposals in a comprehensive review. The PLANCK data shows an unmistakably red, quasi scaleinvariant, purely adiabatic primordial power spectrum and no primary non-Gaussianities. While these observations are consistent with inflationary predictions, bouncing cosmologies aspire to provide an alternative framework to explain them. Such models face many problems, both of the purely theoretical kind, such as the necessity of violating the NEC and instabilities, and at the cosmological application level, as exemplified by the possible presence of shear. We provide a pedagogical introduction to these problems and also assess the fitness of different proposals with respect to the data. For example, many models predict a slightly blue spectrum and must be fine-tuned to generate a red spectral index; as a side effect, large non-Gaussianities often result.We highlight several promising attempts to violate the NEC without introducing dangerous instabilities at the classical and/or quantum level. If primordial gravitational waves are observed, certain bouncing cosmologies, such as the cyclic scenario, are in trouble, while others remain valid. We conclude that, while most bouncing cosmologies are far from providing an alternative to the inflationary paradigm, a handful of interesting proposals have surfaced, which warrant further research. The constraints and lessons learned as laid out in this review might guide future research.

“…VI A. 12 Although the phase issue may still be an open one, the monopole question can possibly be solved in a string theory context since the effective field theory which emerges as its low-energy limit is in general not based on a simply connected GUT group, so that the relevant symmetry-breaking scheme may not include monopole formation [331][332][333]. smoothens and flattens the universe.…”

Section: Avoidance Of Relicsmentioning

confidence: 99%

A critical review of classical bouncing cosmologies

¹

,

²

2015

Physics Reports

View full text Add to dashboard Cite

Given the proliferation of bouncing models in recent years, we gather and critically assess these proposals in a comprehensive review. The PLANCK data shows an unmistakably red, quasi scaleinvariant, purely adiabatic primordial power spectrum and no primary non-Gaussianities. While these observations are consistent with inflationary predictions, bouncing cosmologies aspire to provide an alternative framework to explain them. Such models face many problems, both of the purely theoretical kind, such as the necessity of violating the NEC and instabilities, and at the cosmological application level, as exemplified by the possible presence of shear. We provide a pedagogical introduction to these problems and also assess the fitness of different proposals with respect to the data. For example, many models predict a slightly blue spectrum and must be fine-tuned to generate a red spectral index; as a side effect, large non-Gaussianities often result.We highlight several promising attempts to violate the NEC without introducing dangerous instabilities at the classical and/or quantum level. If primordial gravitational waves are observed, certain bouncing cosmologies, such as the cyclic scenario, are in trouble, while others remain valid. We conclude that, while most bouncing cosmologies are far from providing an alternative to the inflationary paradigm, a handful of interesting proposals have surfaced, which warrant further research. The constraints and lessons learned as laid out in this review might guide future research.

“…Despite substantial recent progress [12][13][14][15][16][17][18][19][20][21][22], heterotic model-building continues to present a number of formidable mathematical obstacles. In addition to a Calabi-Yau three-fold X, heterotic models require two holomorphic (poly-)stable vector bundles V andṼ .…”

Section: Introductionmentioning

confidence: 99%

Monad bundles in heterotic string compactifications

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2008

J. High Energy Phys.

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In this paper, we study positive monad vector bundles on complete intersection Calabi-Yau manifolds in the context of E 8 × E 8 heterotic string compactifications. We show that the class of such bundles, subject to the heterotic anomaly condition, is finite and consists of about 7000 models. We explain how to compute the complete particle spectrum for these models. In particular, we prove the absence of vector-like family anti-family pairs in all cases. We also verify a set of highly non-trivial necessary conditions for the stability of the bundles. A full stability proof will appear in a companion paper. A scan over all models shows that even a few rudimentary physical constraints reduces the number of viable models drastically.anderson@maths.ox.ac.uk

“…The classes of models that have been discussed in most detail are certainly E 8 × E 8 heterotic string compactifications (e.g. [1][2][3]) and Type II orientifold models with intersecting/magnetised D-branes (for references we refer to the most recent review [4]). …”

Section: Introductionmentioning

confidence: 99%

One in a billion: MSSM-like D-brane statistics

et al. 2006

J. High Energy Phys.

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Continuing our recent work hep-th/0411173, we study the statistics of fourdimensional, supersymmetric intersecting D-brane models in a toroidal orientifold background. We have performed a vast computer survey of solutions to the stringy consistency conditions and present their statistical implications with special emphasis on the frequency of Standard Model features. Among the topics we discuss are the implications of the K-theory constraints, statistical correlations among physical quantities and an investigation of the various statistical suppression factors arising once certain Standard Model features are required. We estimate the frequency of an MSSM like gauge group with three generations to be one in a billion.

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