40 citations · 183 across the 12 of their papers we have counts for
12 papers
Spontaneous Symmetry Breaking without classical fields: a Functional Renormalization Group approach
A. Jakovac, P. Mati, P. Posfay
We propose an approach to describe Spontaneous Symmetry Breaking (SSB) that does not rely on the order parameter dependent free energy (Landau theory). We use the Functional Renorm…
High-order harmonics as induced by a quantized field:a phase-space picture
Ákos Gombkötő, Sándor Varró, Péter Mati +1
The interaction of matter with a quantized electromagnetic mode is considered. Representing a strong exciting field, the mode is assumed to contain a large number of photons. As a…
Statistical theory of photon gas in plasma
Peter Mati
The thermodynamical properties of the photon-plasma system had been studied using statistical physics approach. Photons develop an effective mass in the medium thus -- as a result…
Fixed points and the spontaneous breaking of scale invariance
Edouard Marchais, Peter Mati, Daniel F Litim
We investigate critical -component scalar field theories and the spontaneous breaking of scale invariance in three dimensions using functional renormalisation. Global and local…
Quasiparticles in an interacting system of charge and monochromatic field
P. Mati
The spectrum of an exactly solvable non-relativistic system of a charged particle interacting with a quantized electromagnetic mode is studied with various polarizations. Quasipart…
Critical scaling in the large- model in higher dimensions and its possible connection to quantum gravity
P. Mati
The critical scaling of the large- model in higher dimensions using the exact renormalization group equations has been studied, motivated by the recently found non-trivia…
Infrared multiphoton resummation in quantum electrodynamics
P. Mati
Infrared singularities in massless gauge theories are known since the foundation of quantum field theories. The root of this problem can be tracked back to the very definition of t…
Vanishing Beta Function curves from the Functional Renormalisation Group
P. Mati
In this paper we will discuss the derivation of the so-called vanishing beta function curves which can be used to explore the fixed point structure of the theory under consideratio…
Truncation Effects in the Functional Renormalization Group Study of Spontaneous Symmetry Breaking
N. Defenu, P. Mati, I. G. Marian +2
We study the occurrence of spontaneous symmetry breaking (SSB) for O(N) models using functional renormalization group techniques. We show that even the local potential approximatio…
Validating the 2PI resummation: the Bloch-Nordsieck example
A. Jakovac, P. Mati
In this work we provide a numerical method to obtain the Bloch-Nordsieck spectral function at finite temperature in the framework of the 2PI approximation. We find that the 2PI res…
Spectral function of the Bloch-Nordsieck model at finite temperature
A. Jakovac, P. Mati
In this paper we determine the exact fermionic spectral function of the Bloch-Nordsieck model at finite temperature. Analytic results are presented for some special parameters, for…
Resummations in the Bloch-Nordsieck model
A. Jakovac, P. Mati
We studied different levels of resummations of the exactly solvable Bloch-Nordsieck model in order to be able to compare the approximations with an exact result. We studied one-loo…