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O(N) model in Euclidean de Sitter space: beyond the leading infrared approximation
(Springer, 2016-09-19)
We consider an O(N) scalar field model with quartic interaction in d-dimensional Euclidean de Sitter space. In order to avoid the problems of the standard perturbative calculations for light and massless fields, we generalize ...
S-matrix bootstrap for effective field theories: massless pions
(2021-06-01)
We use the numerical S-matrix bootstrap method to obtain bounds on the two leading Wilson coefficients (or low energy constants) of the chiral lagrangian controlling the low-energy dynamics of massless pions. This provides ...
Light composite scalar boson from a see-saw mechanism in two-scale TC models
(2015-09-01)
We consider the possibility of a light composite scalar boson arising from mass mixing between a relatively light and heavy scalar singlets in a see-saw mechanism expected to occur in two-scale Technicolor (TC) models. A ...
Long distance behavior of O(N)-model correlators in de Sitter space and the resummation of secular terms
(Springer, 2018-10)
We analyze the long distance behavior of the two-point functions for an interacting scalar O(N) model in de Sitter spacetime. Following our previous work, this behavior is analyzed by analytic continuation of the Euclidean ...
Quadratic effective action for QED in D=2,3 dimensions
(2000-06-15)
We calculate the effective action for quantum electrodynamics (QED) in D=2,3 dimensions at the quadratic approximation in the gauge fields. We analyze the analytic structure of the corresponding nonlocal boson propagators ...
Quadratic effective action for QED in D=2,3 dimensions
(2000-06-15)
We calculate the effective action for quantum electrodynamics (QED) in D=2,3 dimensions at the quadratic approximation in the gauge fields. We analyze the analytic structure of the corresponding nonlocal boson propagators ...
Liouville theory and logarithmic solutions to knizhnik-zamolodchikov equation
(World Scientific, 2005-12)
We study a class of solutions to the SL(2, ℝ)k Knizhnik-Zamolodchikov equation. First, logarithmic solutions which represent four-point correlation functions describing string scattering processes on three-dimensional ...
Pressure of massless hot scalar theory in the boundary effective theory framework
(AMER PHYSICAL SOC, 2011)
We use the boundary effective theory approach to thermal field theory in order to calculate the pressure of a system of massless scalar fields with quartic interaction. The method naturally separates the infrared physics, ...
Dirac fermions in strong electric field and quantum transport in graphene
(AMER PHYSICAL SOCCOLLEGE PK, 2012)
Our previous results on the nonperturbative calculations of the mean current and of the energy-momentum tensor in QED with the T-constant electric field are generalized to arbitrary dimensions. The renormalized mean values ...
Born-Oppenheimer approximation in an effective field theory language
(Amer Physical Soc, 2018-01-25)
The Born-Oppenheimer approximation is the standard tool for the study of molecular systems. It is founded on the observation that the energy scale of the electron dynamics in a molecule is larger than that of the nuclei. ...