Spectral Action Beyond the Weak-Field Approximation
نویسندگان
چکیده
منابع مشابه
The Effective Weak Hamiltonian beyond the Leading-logarithm Approximation*
The effective nonleptonic weak Hamiltonian is examined beyond the leading-logarithm approximation. In the AS=l, AC=1 part of the Hamiltonian no significant contribution is found. In the AS=l, AC=0 sector coefficients of the "penguin" operators depend strongly on added corrections. The momentum subtraction scheme has been used in the calculation. The independence of the result on the renormaliza...
متن کاملBoson-fermion Model beyond Mean-field Approximation
A model of hybridized bosons and fermions is studied beyond the mean field approximation. The divergent boson self-energy at zero temperature makes the Cooper pairing of fermions impossible. The frequency and momentum dependence of the self-energy and the condensation temperature T c of initially localized bosons are calculated analytically. The value of the boson condensation temperature T c i...
متن کاملA weak approximation for the Extrema's distributions of Levy processes
Suppose that $X_{t}$ is a one-dimensional and real-valued L'evy process started from $X_0=0$, which ({bf 1}) its nonnegative jumps measure $nu$ satisfying $int_{Bbb R}min{1,x^2}nu(dx)
متن کاملComment on “ Boson - fermion model beyond the mean - field approximation ”
In a recent paper [Alexandrov A S 1996 J. Phys.: Condens. Matter 8 6923–32; cond-mat/9603111], it has been suggested that there is no Cooper pairing in boson-fermion models of superconductivity. We show that this conjecture is based on an inconsistent approximation that violates an exact identity. Quite generally, the divergence of the fermion t-matrix (the Thouless criterion) is accompanied by...
متن کاملIn-medium chiral perturbation theory beyond the mean–field approximation
An explicit expression for the generating functional of two–flavor low–energy QCD with external sources in the presence of non-vanishing nucleon densities has been derived recently [1]. Within this approach we derive power counting rules for the calculation of in-medium pion properties. We develop the so-called standard rules for residual nucleon energies of the order of the pion mass and a mod...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications in Mathematical Physics
سال: 2012
ISSN: 0010-3616,1432-0916
DOI: 10.1007/s00220-012-1587-8