Angelantonj, Carlo Partouche, Hervé Pradisi, Gianfranco

The moduli space of toroidal type I vacua, which are consistent at the non-perturbative level, is composed of independent branches characterized by the number (0, 16 or 32) of rigid branes sitting on top of orientifold planes. This structure persists also when supersymmetry is spontaneously broken à la Scherk–Schwarz. We show that all the component...

Partouche, Hervé de Vaulchier, Balthazar

When supersymmetry is spontaneously broken at tree level, the spectrum of the heterotic string compactified on orbifolds of tori contains an infinite number of potentially tachyonic modes. We show that this implies instabilities of Minkowski spacetime, when the scale of supersymmetry breaking is of the order of the string scale. We derive the phase...

Chabrol, Lilian

We present how to construct elliptically fibered K3 surfaces via Weierstrass models which can be parametrized in terms of Wilson lines in the dual heterotic string theory. We work with a subset of reflexive polyhedras that admit two fibers whose moduli spaces contain the ones of the $E_{8}\times E_{8}$ or $\frac{Spin(32)}{\mathbb{Z}_{2}}$ heterotic...

Detournay, Stéphane Petropoulos, P. Marios Zwikel, Céline
Published in
Journal of High Energy Physics

We determine a consistent phase space for a theory consisting in the Einstein-Hilbert action coupled to matter fields (dilaton, one-form, two-form) and containing three-dimensional black strings (the Horne-Horowitz solution and generalizations thereof). The theory at hand is the low energy effective action for the bosonic sector of heterotic string...

Kehagias, Alexandros Partouche, Herve

We discuss the Casimir effect in heterotic string theory. This is done by considering a Z_2 twist acting on one external compact direction and three internal coordinates. The hyperplanes fixed by the orbifold generator G realize the two infinite parallel plates. For the latter to behave as "conducting material", we implement in a modular invariant ...

Matsumoto, Shigeki Shirai, Satoshi Takeuchi, Michihisa
Published in
Journal of High Energy Physics

Electroweak-interacting massive particles (EWIMPs) exist in a broad class of new physics models beyond the Standard Model. Searching for such particles is one of most primary goal at the LHC and future colliders. The EWIMP generally affects the LHC signatures through quantum corrections even without direct productions. By measuring the Standard Mod...

Fraiman, Bernardo Graña, Mariana Nuñez, Carmen A.
Published in
Journal of High Energy Physics

A rich pattern of gauge symmetries is found in the moduli space of heterotic string toroidal compactifications, at fixed points of the T-duality transformations. We analyze this pattern for generic tori, and scrutinize in full detail compactifications on a circle, where we find all the maximal gauge symmetry groups and the points where they arise. ...

Ketov, Sergey V. Khlopov, Maxim Yu.

We review some recent trends in the inflationary model building, the super-symmetry (SUSY) breaking, the gravitino Dark Matter (DM) and the PrimordialBlack Holes (PBHs) production in supergravity. The Starobinsky inflation can beembedded into supergravity when the inflaton belongs to the massive vectormultiplet associated with a (spontaneously brok...

Coudarchet, Thibaut Partouche, Herve

We analyze quantum no-scale regimes (QNSR) in perturbative heterotic string compactified on tori, with total spontaneous breaking of supersymmetry. We show that for marginal deformations initially at any point in moduli space, the dynamics of a flat, homogeneous and isotropic universe can always be attracted to a QNSR. This happens independently of...

Florakis, Ioannis

We review recent progress in addressing the decompactification problem of gauge couplings in the context of heterotic string theory with spontaneous supersymmetry breaking. This problem is particularly relevant in large volume scenarios where quantum corrections to gauge couplings typically explode and the theory is driven to the non-perturbative r...