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Adding flavour to the S-matrix bootstrap
(2018-12-01)
We explore the S-matrices of gapped, unitary, Lorentz invariant quantum field theories with a global O(N) symmetry in 1+1 dimensions. We extremize various cubic and quartic couplings in the two-to-two scattering amplitudes ...
The O(N) S-matrix monolith
(2020-04-01)
We consider the scattering matrices of massive quantum field theories with no bound states and a global O(N) symmetry in two spacetime dimensions. In particular we explore the space of two-to-two S-matrices of particles ...
Non-perturbative λΦ4 in D=1+1: an example of the constructive quantum field theory approach in a schematic way
(Springer, 2013-08)
During the '70, several relativistic quantum field theory models in D = 1 + 1 and also in D = 2 + 1 have been constructed in a non-perturbative way. That was done in the so-called constructive quantum field theory approach, ...
Nonperturbative effective-field theory for two-leg antiferromagnetic spin ladders
(American Physical Society, 2001-12)
We study the long wavelength limit of a spin- 2 Heisenberg antiferromagnetic two-leg ladder, treating the interchain coupling in a nonperturbative way. We perform a mean field analysis and then include the fluctuations in ...
A TT¯ -like deformation of the Skyrme model and the Heisenberg model of nucleon-nucleon scattering
(2021-05-01)
The Skyrme model, though it admits correctly a wide range of static properties of the nucleon, does not seem to reproduce properly the scattering behavior of nucleons at high energies. In this paper we present a TT¯ -like ...
Optimized δ expansion for the Walecka model
(Elsevier B.V., 2014)
The S-matrix bootstrap. Part III: higher dimensional amplitudes
(2019-12-01)
We consider constraints on the S-matrix of any gapped, Lorentz invariant quantum field theory in 3+1 dimensions due to crossing symmetry, analyticity and unitarity. We extremize cubic couplings, quartic couplings and ...
Weak decays of magnetized charged pions in the symmetric gauge
(American Physical Society, 2020-02)
We consider the decay π-→lνl (l=e-,μ-) in the presence of an arbitrary large uniform magnetic field, using the symmetric gauge. The consequences of the axial symmetry of the problem and the issue of angular momentum ...
A path integral realization of joint JT¯ , TJ¯ and TT¯ flows
(Springer, 2020-07)
We recast the joint JT¯ , TJ¯ and TT¯ deformations as coupling the original theory to a mixture of topological gravity and gauge theory. This geometrizes the general flow triggered by irrelevant deformations built out of ...