Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Ioannis Florakis"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 10, Pp 1-19 (2024)
Abstract We construct rigid non-supersymmetric heterotic vacua with reduced rank and no tachyons in six and four dimensions. These configurations are based on asymmetric orbifold compactifications which do not admit neutral deformation moduli and rep
Externí odkaz:
https://doaj.org/article/3b83634effe1464daf498c6e4facbf63
Autor:
Ioannis Florakis, John Rizos
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 1, Pp 1-39 (2024)
Abstract We systematically develop the explicit map between string vacua constructed in the Free Fermionic Formulation and their ℤ 2 N $$ {\mathbb{Z}}_2^N $$ toroidal orbifold counterparts. We illustrate the map in various example classes of models
Externí odkaz:
https://doaj.org/article/cd41fb19b5fc42e78848f54fd488d9d2
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 6, Pp 1-29 (2023)
Abstract In a remarkable paper, Dienes discovered that the absence of physical tachyons in closed string theory is intimately related to oscillations in the net number of bosonic minus fermionic degrees of freedom, a pattern predicted by an underlyin
Externí odkaz:
https://doaj.org/article/5065a66da36a40768cde218f2a591a58
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 5, Pp 1-18 (2022)
Abstract It was recently shown that the N $$ \mathcal{N} $$ = 2 string topological amplitudes in the heterotic weak coupling limit generate a six-dimensional Melvin space, providing a description of the Ω-background in string theory, where string pr
Externí odkaz:
https://doaj.org/article/dc545ee526f34a358533271333455720
Publikováno v:
Physics Letters B, Vol 833, Iss , Pp 137311- (2022)
We derive the conditions for the one-loop contribution to the cosmological constant to be exponentially suppressed in a class of heterotic string compactifications with three generations of chiral matter, where supersymmetry is spontaneously broken
Externí odkaz:
https://doaj.org/article/f7c272c16dff434a85663c15d25e50d4
Publikováno v:
Nuclear Physics B, Vol 976, Iss , Pp 115689- (2022)
We construct and classify heterotic models where N=1 supersymmetry is spontaneously broken à la Scherk-Schwarz. The theories contain chiral matter transforming under an observable Pati-Salam gauge symmetry and are classified according to a minimal s
Externí odkaz:
https://doaj.org/article/367270780db1443888d4303d54f416b6
Autor:
Carlo Angelantonj, Ioannis Florakis
Publikováno v:
Physics Letters B, Vol 789, Iss , Pp 496-501 (2019)
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. We illustrate this approach with an explicit example of a
Externí odkaz:
https://doaj.org/article/f7a987412cbd4b619444232e260a7352
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 2, Pp 1-47 (2018)
Abstract We analyse various two dimensional theories arising from compactification of type II and heterotic string theory on asymmetric orbifolds. We find extra supersymmetry generators arising from twisted sectors, giving rise to exotic supersymmetr
Externí odkaz:
https://doaj.org/article/63a7d69aeb4044ffbaf108f0071c8097
Autor:
Ioannis Florakis, John Rizos
Publikováno v:
Nuclear Physics B, Vol 921, Iss C, Pp 1-24 (2017)
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. Whenever the Kaluza–Klei
Externí odkaz:
https://doaj.org/article/620a254efe4a4c98abf1db4bdd270348
Autor:
Ioannis Florakis
Publikováno v:
Nuclear Physics B, Vol 916, Iss C, Pp 484-509 (2017)
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. We show that in both heterotic and type II theori
Externí odkaz:
https://doaj.org/article/89e77f1400fc4e69a8b0050665e81c78