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Galaxies 2014, 2(2), 223-258;

String Phenomenology: Past, Present and Future Perspectives

Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, UK
This article represents the author’s light cone in the area of string phenomenology, to which he contributed since the late eighties. The author extends his apologies to those outside this light cone.
Received: 28 February 2014 / Revised: 10 April 2014 / Accepted: 15 April 2014 / Published: 22 April 2014
(This article belongs to the Special Issue Particle Physics and Quantum Gravity Implications for Cosmology)
Full-Text   |   PDF [348 KB, uploaded 22 April 2014]


The observation of a scalar resonance at the Large Hadron Collider (LHC), compatible with perturbative electroweak symmetry breaking, reinforces the Standard Model (SM) parameterisation of all subatomic data. The logarithmic evolution of the SM gauge and matter parameters suggests that this parameterisation remains viable up to the Planck scale, where gravitational effects are of comparable strength. String theory provides a perturbatively consistent scheme to explore how the parameters of the Standard Model may be determined from a theory of quantum gravity. The free fermionic heterotic string models provide concrete examples of exact string solutions that reproduce the spectrum of the Minimal Supersymmetric Standard Model. Contemporary studies entail the development of methods to classify large classes of models. This led to the discovery of exophobic heterotic-string vacua and the observation of spinor-vector duality, which provides an insight to the global structure of the space of (2,0) heterotic-string vacua. Future directions entail the study of the role of the massive string states in these models and their incorporation in cosmological scenarios. A complementary direction is the formulation of quantum gravity from the principle of manifest phase space duality and the equivalence postulate of quantum mechanics, which suggest that space is compact. The compactness of space, which implies intrinsic regularisation, may be tightly related to the intrinsic finite length scale, implied by string phenomenology. View Full-Text
Keywords: unification; string phenomenology; particle physics; quantum gravity unification; string phenomenology; particle physics; quantum gravity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Faraggi, A.E. String Phenomenology: Past, Present and Future Perspectives. Galaxies 2014, 2, 223-258.

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