24 citations · 43 across the 11 of their papers we have counts for
12 papers
TeV-scale leptogenesis in a parity symmetric neutrino mass model
Keisuke Harigaya, Gio Leone
We study leptogenesis via out-of-equilibrium decays of right-handed neutrinos in a parity symmetric extension of the Standard Model with gauge group $SU(3)_c \times SU(2)_L \times…
UV/IR relations from the worldsheet
Christian Aoufia, Ivano Basile, Giorgio Leone +1
We derive universal scaling relations for the low-energy effective action of string theory, connecting the vacuum energy and gauge couplings to higher-derivative Wilson coefficient…
Non-supersymmetric strings on AdS: a world-sheet perspective
Giorgio Leone
We explore the quantisation of the tachyonic type 0B superstring and the non-tachyonic heterotic string on AdS$_3 \tim…
Aspects of strings without spacetime supersymmetry
Giorgio Leone, Salvatore Raucci
String theory relies on spacetime supersymmetry to guarantee the existence of stable vacua. In this review, we survey two features of non-supersymmetric strings that challenge both…
New comments on six-dimensional orientifold vacua with reduced rank and unitarity constraints
Giorgio Leone
We revisit and extend the construction of six-dimensional orientifolds built upon the orbifolds with a non-vanishing Kalb-Ramond background, both in the presence…
Aspects of Stability, Rigidity and Unitarity in String Vacua
Giorgio Leone
In this Thesis we investigate properties of stability, rigidity and unitarity of the string landscape in ten and lower dimensions. The dissertation explores these aspects by intert…
Non-supersymmetric non-tachyonic heterotic vacua with reduced rank in various dimensions
Carlo Angelantonj, Ioannis Florakis, Giorgio Leone +1
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 compactifi…
Species scale, worldsheet CFTs and emergent geometry
Christian Aoufia, Ivano Basile, Giorgio Leone
We study infinite-distance limits in the moduli space of perturbative string vacua. The remarkable interplay of string dualities seems to determine a highly non-trivial dichotomy,…
Rigid Vacua with Brane Supersymmetry Breaking
C. Angelantonj, C. Condeescu, E. Dudas +1
We construct new string vacua featuring Brane Supersymmetry Breaking, based on orientifolds with planes and branes. Differen…
Tachyons and Misaligned Supersymmetry in Orientifold Vacua
Giorgio Leone
We extend the analysis of Misaligned Supersymmetry to orientifold vacua. The lack of modular invariance in the Klein bottle, annulus and Möbius strip amplitudes implies that the IR…
Anomaly constraints for heterotic strings and supergravity in six dimensions
Ivano Basile, Giorgio Leone
The landscape of six-dimensional supergravities is dramatically constrained by the cancellation of gauge and gravitational anomalies, but the full extent of its implications has no…
Tachyons and Misaligned Supersymmetry in Closed String Vacua
Carlo Angelantonj, Ioannis Florakis, Giorgio Leone
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 ferm…