SCOAP3 Repository 11 records found  1 - 10nextSearch took 0.02 seconds. 
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 789 (2019) 496-501 10.1016/j.physletb.2018.12.054
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2. 2d orbifolds with exotic supersymmetry / Florakis, Ioannis ; García-Etxebarria, 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 non-supersymmetric heterotic strings / Florakis, Ioannis
We compute one-loop quantum corrections to gravitational couplings in the effective action of four-dimensional 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 semi-realistic 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 so-called 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 one-loop 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 one-loop integrals associated to BPS-saturated amplitudes in N=2 heterotic vacua. [...]
Published in Nuclear Physics B 897 (2015) 781-820 10.1016/j.nuclphysb.2015.06.009
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9. Higher spins in hyper-superspace / 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 higher-spin fields, formulated in spaces with extra tensorial directions (hyperspaces), to the description of OSp(1|2n) -invariant infinite-dimensional higher-spin supermultiplets formulated in terms of scalar superfields on flat hyper-superspaces and on OSp(1|n) supergroup manifolds. [...]
Published in Nuclear Physics B 890 (2015) 279-301 10.1016/j.nuclphysb.2014.11.017
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10. Universality of gauge thresholds in non-supersymmetric heterotic vacua / Angelantonj, Carlo ; Florakis, Ioannis ; Tsulaia, Mirian
We compute one-loop threshold corrections to non-abelian gauge couplings in four-dimensional heterotic vacua with spontaneously broken N=2→N=0 supersymmetry, obtained as Scherk–Schwarz reductions of six-dimensional K3 compactifications. [...]
Published in Physics letters B 736 (2014) 365-370 10.1016/j.physletb.2014.08.001
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