Optimized Perturbation Theory at Finite Temperature
S. Chiku, T. Hatsuda
Abstract
An optimized perturbation theory (OPT) at finite temperature T, which resums higher order terms in the naive perturbation, is developed in O(N) phi4 theory. It is proved that (i) the renormalization of the ultra-violet divergences can be carried out systematically in any given order of OPT, and (ii) the Nambu-Goldstone theorem is fulfilled for arbitrary N and for any given order of OPT. The method is applied for the O(4) sigma model to study the soft modes associated with the chiral transition in quantum chromodynamics. Threshold enhancement of the spectral functions at finite T in the scalar and pseudo-scalar channels is shown to be a typical signal of the chiral transition.
Create a lesson
Related papers
A global analysis of B DP and B D P decays
Bhubanjyoti Bhattacharya, Rida Boumris, David London
Transient PULSE: Code for the Transient Propagation of UltraLight (pseudo)Scalars to Earth
Jason Arakawa, Charles Cheung, Muhammad Hani Zaheer et al.
Top-Quark Mass Scheme Uncertainties in Higgs Boson Pair Production via Gluon Fusion
Clara Del Pio, Sebastian Jaśkiewicz, Rebecca von Kuk et al.
Effects of quadratic frequency chirping and carrier-envelope phase on Schwinger pair production in polarized electric fields
Abhinav Jangir
Brownian GPDs: A Stochastic Calculus Approach to Generalized Parton Distributions from Integral Constraints
Douglas Q. Adams, Simonetta Liuti, Zaki Panjsheeri et al.
Strangeness suppression, the ϕ meson and ΛΛ spin correlations from exact strangeness conservation at the quark level
P. Castorina, H. Satz