Equation of state for systems with Goldstone bosons
نویسندگان
چکیده
We discuss some recent determinations of the equation of state for the XY and the Heisenberg universality class.
منابع مشابه
Fluctuation-induced Nambu-Goldstone bosons in a Higgs-Josephson model
We present a new mechanism of fluctuation-induced Nambu-Goldstone bosons in a scalar field theory of Higgs-Josephson systems. We consider a simple scalar field model with U(1) rotational symmetry. When there is an interaction which violates the rotational symmetry, the Nambu-Goldstone bosons become massive and massless bosons are concealed. We present a model where the massive boson becomes a m...
متن کاملJ un 2 00 4 Equation of State for Spin Systems with Goldstone Bosons : the 3 d O ( 4 ) Case
We propose an improved parametric form for the equation of state of threedimensional O(N) spin systems. The proposed form is a series expansion with two sets of terms, which contribute (mainly) separately to the description of the highand low-temperature regions of the phase diagram. Our goal is a better description of the low-temperature phase at zero magnetic field (i.e. the coexistence line)...
متن کاملRemarks on nonrelativistic Goldstone bosons
We discuss excitations in nonrelativistic field theories with spontaneous breaking of a continuous global symmetry. It is known that in such systems there are two types of Goldstone bosons (Type A and Type B) whose dispersion law is generically linear or quadratic, respectively. We show that Type B Goldstone bosons may have gapped partners which we call almost-Goldstone bosons. With some nondeg...
متن کاملProduction by Nambu Goldstone Bosons with Application to Inflation Rehea
A semiclassical calculation of particle production by a scalar field in a potential is performed. We focus on the particular case of production of fermions by a NambuGoldstone boson θ. We have derived a (non)local equation of motion for the θ-field with the backreaction of the produced particles taken into account. The equation is solved in some special cases, namely for purely Nambu-Goldstone ...
متن کاملQuintessentially Flat Scalar Potentials
Both inflationary and quintessence cosmologies require scalar fields which roll very slowly over cosmological time scales, and so typically demand extremely flat potentials. Sufficiently flat potentials are notoriously difficult to obtain from realistic theories of microscopic physics, and this poses a naturalness problem for both types of cosmologies. We propose a brane-world-based microscopic...
متن کامل