8 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…