The Holstein model with dispersionless Einstein phonons is one of the simplest models describing electron-phonon interactions in condensed matter. A naive extrapolation of perturbation theory in powers of the relevant dimensionless electron-phonon coupling suggests that at zero temperature the model exhibits
a Pomeranchuk instability characterized by a divergent uniform compressibility at a...
We derive renormalized Callan-Symanzik Flowequations in the FRG setup and apply the framework of spectral renormalisation to compute the full, nonperturbative spectral function of a \phi^4 theory in (2+1) dimensions
An asymptotically-safe theory of quantum gravity could render a non-perturbative renormalization of general relativity, restoring its predictive power at higher energies. The asymptotic-safety community has been finding indications for that, mainly using the functional renormalization group framework. In this poster, I will explore the predictive power of asymptotically-safe quantum gravity...
The Yang-Mills gauge theory in 5 dimensional spacetime is perturbatively non-renormalizable, but could be asymptotically safe. We study the fixed point structure by using the functional renormalization group.
We apply nonperturbative renormalization group method to critical exponents of m-axial Lifshitz point as a function of dimensionality d, anisotropy m and the number of order parameter components N. Basing on the results we consider the stability of the Fulde-Ferrell-Larkin-Ovchinnikov states in cold atom system.
