228 citations · 2.6k across the 85 of their papers we have counts for
39 papers · 1 filter
A Rotor-Dressed Semiton State in a Monopole--Fermion Model
Yuta Hamada
In four-flavor massless QED with a magnetic monopole, a single incident fermion is scattered into a state carrying a half-integral current vector in each flavor channel, called the…
Composite topological solitons consisting of domain walls, strings, and monopoles in models
Minoru Eto, Yu Hamada, Muneto Nitta
We study various composites of global solitons consisting of domain walls, strings, and monopoles in linear models with and . Spontaneous symmetry breaking (SSB) of…
Dualities from Swampland principles
Alek Bedroya, Yuta Hamada
We initiate the program of bottom-up derivation of string theory dualities using Swampland principles. In particular, we clarify the relation between Swampland arguments and all th…
On (Scalar QED) Gravitational Positivity Bounds
Yuta Hamada, Rinto Kuramochi, Gregory J. Loges +1
We study positivity bounds in the presence of gravity. We first review the gravitational positivity bound at the tree-level, where it is known that a certain amount of negativity i…
Energy of boundary of spacetime
Yu Hamada, Nobuyuki Matsumoto
We consider how the energy can be stored in the boundary of spacetime, in particular in a spherical bubble that can be made by a quantum gravitational process. Our calculation is p…
Baby universes in 2d and 4d theories of quantum gravity
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana
The validity of the Coleman mechanism, which automatically tunes the fundamental constants, is examined in two-dimensional and four-dimensional quantum gravity theories. First, we…