1.

GUT scale unification in heterotic strings
/ Angelantonj, Carlo ; Florakis, Ioannis
We present a class of heterotic compactifications where it is possible to lower the string unification scale down to the GUT scale, while preserving the validity of the perturbative analysis. [...]
Published in Physics letters B (2019)
10.1016/j.physletb.2018.12.054
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2.

2d orbifolds with exotic supersymmetry
/ Florakis, Ioannis ; GarcíaEtxebarria, Iñaki ; Lüst, Dieter ; Regalado, Diego
We analyse various two dimensional theories arising from compactification of type II and heterotic string theory on asymmetric orbifolds. [...]
Published in JHEP 1802 (2018) 146
10.1007/JHEP02(2018)146
arXiv:1712.04318
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3.

A solution to the decompactification problem in chiral heterotic strings
/ Florakis, Ioannis ; Rizos, John
We present a solution to the decompactification problem of gauge thresholds in chiral heterotic string theories with two large extra dimensions, where supersymmetry is spontaneously broken by the Scherk–Schwarz mechanism. [...]
Published in Nuclear Physics B (2017)
10.1016/j.nuclphysb.2017.05.002
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4.

Gravitational threshold corrections in nonsupersymmetric heterotic strings
/ Florakis, Ioannis
We compute oneloop quantum corrections to gravitational couplings in the effective action of fourdimensional heterotic strings where supersymmetry is spontaneously broken by Scherk–Schwarz fluxes. [...]
Published in Nuclear Physics B (2017)
10.1016/j.nuclphysb.2017.01.016
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5.

Chiral heterotic strings with positive cosmological constant
/ Florakis, Ioannis ; Rizos, John
We present explicit examples of semirealistic heterotic models with spontaneously broken supersymmetry, which dynamically lead to breaking scales much smaller than MPlanck and exponentially small positive values for the cosmological constant. [...]
Published in Nuclear Physics B (2016)
10.1016/j.nuclphysb.2016.09.018
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6.

N=2⋆ from topological amplitudes in string theory
/ Florakis, Ioannis ; Zein Assi, Ahmad
In this paper, we explicitly construct string theory backgrounds that realise the socalled N=2⋆ gauge theory. [...]
Published in Nuclear Physics B (2016)
10.1016/j.nuclphysb.2016.05.017
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7.

Generalised universality of gauge thresholds in heterotic vacua with and without supersymmetry
/ Angelantonj, Carlo ; Florakis, Ioannis ; Tsulaia, Mirian
We study oneloop quantum corrections to gauge couplings in heterotic vacua with spontaneous supersymmetry breaking. [...]
Published in Nuclear Physics B (2015)
10.1016/j.nuclphysb.2015.09.007
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8.

Threshold corrections, generalised prepotentials and Eichler integrals
/ Angelantonj, Carlo ; Florakis, Ioannis ; Pioline, Boris
We continue our study of oneloop integrals associated to BPSsaturated amplitudes in N=2 heterotic vacua. [...]
Published in Nuclear Physics B 897 (2015) 781820
10.1016/j.nuclphysb.2015.06.009
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9.

Higher spins in hypersuperspace
/ Florakis, Ioannis ; Sorokin, Dmitri ; Tsulaia, Mirian
We extend the results of arXiv:1401.1645 on the generalized conformal Sp(2n) structure of infinite multiplets of higherspin fields, formulated in spaces with extra tensorial directions (hyperspaces), to the description of OSp(12n) invariant infinitedimensional higherspin supermultiplets formulated in terms of scalar superfields on flat hypersuperspaces and on OSp(1n) supergroup manifolds. [...]
Published in Nuclear Physics B 890 (2015) 279301
10.1016/j.nuclphysb.2014.11.017
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10.

Universality of gauge thresholds in nonsupersymmetric heterotic vacua
/ Angelantonj, Carlo ; Florakis, Ioannis ; Tsulaia, Mirian
We compute oneloop threshold corrections to nonabelian gauge couplings in fourdimensional heterotic vacua with spontaneously broken N=2→N=0 supersymmetry, obtained as Scherk–Schwarz reductions of sixdimensional K3 compactifications. [...]
Published in Physics letters B 736 (2014) 365370
10.1016/j.physletb.2014.08.001
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