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7 papers · 2 filters
On Climbing Scalars in String Theory
E. Dudas, N. Kitazawa, A. Sagnotti
In string models with "brane supersymmetry breaking" exponential potentials emerge at (closed-string) tree level but are not accompanied by tachyons. Potentials of this type have l…
Non-singular string cosmology in a 2d Hybrid model
Ioannis Florakis, Costas Kounnas, Herve Partouche +1
The existence of non-singular string cosmologies is established in a class of two-dimensional supersymmetric Hybrid models at finite temperature. The left-moving sector of the Hybr…
One-loop Yukawa Couplings in Local Models
Joseph P. Conlon, Mark Goodsell, Eran Palti
We calculate the one-loop Yukawa couplings and threshold corrections for supersymmetric local models of branes at singularities in type IIB string theory. We compute the correction…
E7(7) symmetry in perturbatively quantised N=8 supergravity
Guillaume Bossard, Christian Hillmann, Hermann Nicolai
We study the perturbative quantisation of N=8 supergravity in a formulation where its E7(7) symmetry is realised off-shell. Relying on the cancellation of SU(8) current anomalies w…
Classification of Heterotic Pati-Salam Models
Benjamin Assel, Kyriakos Christodoulides, Alon E. Faraggi +2
We extend the classification of free fermionic heterotic-string models to vacua in which the SO(10) GUT symmetry is broken at the string level to the Pati-Salam subgroup. Using our…
Mass hierarchies and non-decoupling in multi-scalar field dynamics
Ana Achúcarro, Jinn-Ouk Gong, Sjoerd Hardeman +2
In this work we study the effects of field space curvature on scalar field perturbations around an arbitrary background field trajectory evolving in time. Non-trivial imprints of t…