1 citations · 1 across the 5 of their papers we have counts for
6 papers
Boundary observables in string field theory
Klaus Kaja, Carlo Maccaferri, Ulisses Portugal +1
Starting from the gauge invariant action for free string field theory with boundary recently constructed in 2506.05969, we define new gauge invariant observables which are analogou…
Heterotic String Field Theory with Manifest Spacetime Supersymmetry
Nathan Berkovits, Ulisses M. Portugal
Using the hybrid formalism with manifest spacetime supersymmetry, we construct the quadratic term in the heterotic superstring field theory action. As in open superstri…
Super Yang-Mills Action from Hybrid Superstring Field Theory
Ulisses M Portugal
We explicitly compute the effective action from Open Superstring Field Theory in the hybrid formalism to quartic order in the limit, and show that it reproduces t…
A two parameter family of lightcone-like hyperbolic string vertices
Vinicius Bernardes, Ulisses Portugal
We introduce a two parameter family of string field theory vertices, which we refer to as hyperbolic Kaku vertices. It is defined in terms of hyperbolic metrics on the Riemann surf…
Instanton Solutions in Open Superstring Field Theory
Nathan Berkovits, Vilson Fabricio Juliatto, Ulisses M. Portugal
Open superstring field theory admits a "hybrid" formulation where N = 1 D = 4 supersymmetry is manifest for Calabi-Yau compactifications to four dimensions. Using this formulation,…
The monopole problem in holographic cosmology
Horatiu Nastase, Ulisses M. Portugal
In this letter we clarify that the monopole problem can always be solved in bosonic holographic cosmology, by the analogue of "dilution" in inflation, which is the fact that the {\…