Moduli corrections to gravitational couplings from string loops
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In this paper, moduli dependent threshold corrections to gravitational couplings in the case of the heterotic string compactified on a symmetric orbifold, for untwisted moduli, were studied.About:
This article is published in Physics Letters B.The article was published on 1992-06-11 and is currently open access. It has received 187 citations till now. The article focuses on the topics: Heterotic string theory & Moduli.read more
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The pre-big bang scenario in string cosmology
TL;DR: In this paper, physical motivations, phenomenological consequences, and open problems of the so-called pre-big bang scenario in superstring cosmology are reviewed, as well as some open problems.
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Algebras, BPS states, and strings
TL;DR: In this paper, the role played by BPS states in the calculation of threshold corrections of D = 4, N = 2 heterotic string compactifications is clarified, and the relation of their results with string duality is discussed.
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Twenty years of the Weyl anomaly
TL;DR: Weyl rescalings of the metric tensor displayed by classical massless-field systems in interaction with gravity no longer survive in the quantum theory as discussed by the authors, and have found a variety of applications in black-hole physics, cosmology, string theory and statistical mechanics.
Phenomenological aspects of the pre-big-bang scenario in string cosmology
TL;DR: In this article, the authors review various aspects of the pre-big-bang scenario and of its main open problems, with emphasis on the role played by the dilaton, and show that tests of this scenario are direct tests of string theory and also, more generally, of Planck scale physics.
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Singularity-free cosmological solutions of the superstring effective action
TL;DR: In this paper, the cosmological solutions of the one-loop corrected superstring effective action, in a Friedmann-Robertson-Walker background, and in the presence of the dilaton and modulus fields, were studied.
References
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Superspace Or One Thousand and One Lessons in Supersymmetry
TL;DR: The 1983 book, free at last, with corrections and bookmarks as mentioned in this paper, was the first book to be published with CM (TeX) fonts, from the original troff, but now with CM fonts.
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Curvature Squared Terms and String Theories
TL;DR: The compatibility between the presence of curvature squared terms and the absence of ghost particles in the low energy limits of string theories is established in this article, where the Lagrangian σ√g d D ×(R μν ϱσ R μνϱσ σ −4 σ +R 2 ) leads to ghost-free nontrivial gravitational self-interactions for dimensions higher than four.
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Moduli dependence of string loop corrections to gauge coupling constants
TL;DR: In this article, the exact functional dependence of Δa(U) on any untwisted modulus field U of an orbifold vacuum was derived, where Aa is easily computable rational constants.
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One-loop threshold effects in string unification☆
TL;DR: In this paper, the authors show how to compute one-loop corrections to these relations for any four-dimensional model based on a classical vacuum of the heterotic string, which can be used to calculate both sin2θW and ΛQCD in terms of αQCD and MPlanck.
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Quantizing gravity with a cosmological constant
S.M. Christensen,M. J. Duff +1 more
TL;DR: In this article, the authors argue that the quantization of gravity with a cosmological constant, Λ, is both necessary and feasible (in the sense that the evaluation of the functional integral is no more difficult than when Λ= 0).