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5 papers · 2 filters
QCD in magnetic field, Landau levels and double-life of unbroken center-symmetry
Mohamed M. Anber, Mithat Unsal
We study the thermal confinement/deconfinement and non-thermal quantum phase transitions or rapid cross-overs in QCD and QCD-like theories in external magnetic fields. At large mag…
Resurgence theory, ghost-instantons, and analytic continuation of path integrals
Gokce Basar, Gerald V. Dunne, Mithat Unsal
A general quantum mechanical or quantum field theoretical system in the path integral formulation has both real and complex saddles (instantons and ghost-instantons). Resurgent asy…
Resurgence in QFT: Unitons, Fractons and Renormalons in the Principal Chiral Model
Aleksey Cherman, Daniele Dorigoni, Gerald V. Dunne +1
We explain the physical role of non-perturbative saddle points of path integrals in theories without instantons, using the example of the asymptotically free two-dimensional princi…
Generating Non-perturbative Physics from Perturbation Theory
Gerald V. Dunne, Mithat Unsal
In a large variety of quantum mechanical systems, we show that the full non-perturbative expression for energy eigenvalues, containing all orders of perturbative, non-perturbative…
Large N Volume Independence and an Emergent Fermionic Symmetry
Gokce Basar, Aleksey Cherman, Daniele Dorigoni +1
Large-N volume independence in circle-compactified QCD with N_f \geq 1 adjoint Weyl fermions implies the absence of any phase transitions as the radius is dialed to arbitrarily sma…