We find new non-Abelian flux tube solutions in a model of Nf scalar fields in the fundamental representation of SU(Nc) × U(1) (Nc ≤ Nf ) and study their main properties. Among the solutions there are spinning strings as well as superconducting ones. The solutions exist only on a non trivial domain of the parameter space defined by the ratio between the SU(Nc) and U(1) coupling constants, the ma...

We consider a system of coupled cubic nonlinear Schrödinger (NLS) equations i ∂ψj ∂t = − ∂ψj ∂x2 + ψj n ∑ k=1 αjk|ψk| j = 1, 2, . . . , n, where the interaction coefficients αjk are real. The spectral stability of solitary wave solutions (both bright and dark) is examined both analytically and numerically. Our results build on preceding work by Nguyen et al. and others. Specifically, we present...

We present a new technique for constraining the topology of the universe. The method exploits the existence of correlations in the phases of the spherical harmonic coefficients of the CMB temperature pattern associated with matched pairs of circles seen in the sky in universes with non-trivial topology. Unlike other statistics developed to hunt for these matched circles, the method is computati...