69 citations · 192 across the 9 of their papers we have counts for
8 papers · 1 filter
On small Dirac Neutrino Masses in String Theory
Gonzalo F. Casas, Luis E. Ibáñez, Fernando Marchesano
We study how tiny Dirac neutrino masses consistent with experimental constraints can arise in string theory SM-like vacua. We use as a laboratory 4d type IIA Calabi--Y…
Modular Invariant Starobinsky Inflation and the Species Scale
Gonzalo F. Casas, Luis E. Ibáñez
Potentials in cosmological inflation often involve scalars with trans-Planckian ranges. As a result, towers of states become massless and their presence pushes the fundamental scal…
Yukawa Couplings at Infinite Distance and Swampland Towers in Chiral Theories
Gonzalo F. Casas, Luis E. Ibáñez, Fernando Marchesano
We study limits of vanishing Yukawa couplings of 4d chiral matter fields in Quantum Gravity, using as a laboratory type IIA orientifolds with D6-branes. In these theories chiral fe…
On the Species Scale, Modular Invariance and the Gravitational EFT expansion
Alberto Castellano, Alvaro Herráez, Luis E. Ibáñez
The concept of the species scale as the quantum gravity cut-off has been recently emphasised in the context of the Swampland program. Along these lines, we continue the quest for a…
Entropy Bounds and the Species Scale Distance Conjecture
José Calderón-Infante, Alberto Castellano, Alvaro Herráez +1
The Swampland Distance Conjecture (SDC) states that, as we move towards an infinite distance point in moduli space, a tower of states becomes exponentially light with the geodesic…
Towers and Hierarchies in the Standard Model from Emergence in Quantum Gravity
Alberto Castellano, Álvaro Herráez, Luis E. Ibáñez
Based on Quantum Gravity arguments, it has been suggested that all kinetic terms of light particles below the UV cut-off could arise in the IR via quantum (loop) corrections. These…
The Emergence Proposal in Quantum Gravity and the Species Scale
Alberto Castellano, Alvaro Herráez, Luis E. Ibáñez
In the Emergence Proposal in QG it is conjectured that all light-particle kinetic terms are absent in the fundamental UV theory and are generated by quantum corrections in the IR.…
Modular Symmetries and the Swampland Conjectures
Eduardo Gonzalo, Luis E. Ibáñez, Ángel M. Uranga
Recent string theory tests of swampland ideas like the distance or the dS conjectures have been performed at weak coupling. Testing these ideas beyond the weak coupling regime rema…