We discuss the problem of noncommutative SO(N) gauge field theories from the string one–loop point of view. To this end we propose an expression for the string propagator on the boundary of the Möbius strip in the presence of a constant B field. We discuss in detail the problems related to its derivation. Then we use it to compute the one–loop corrections to two–, three– and four–gluon amplitud...

We consider a sigma model formulation of open string theory with boundary fermions carrying Chan-Paton charges at the string ends. This formalism is particularly suitable for studying world-volume potentials on D-branes. We perform explicit twoloop computations of the potential T-dual to the non-abelian Born-Infeld action. We also discuss the world-volume couplings of NS fluxes which are respon...

1. Dr Noel Paton showed a specimen of A large glioma growing from the upper surface of the cerebellum, chiefly from the left side, but extending over to the right side. The tumour extended from the anterior to the posterior border of the cerebellum, and extended deeply into the organ, destroying nearly one-half of its substance. Sections of the tumour exhibited under the microscope showed it to...

July 19, 2016 e17 CorrpondenCe To the Editor: I read with great interest the editorial1 regarding the prevalence of familial hypercholesterolemia (FH) in the United States and why the early recognition of this condition is so essential for the optimal management of individuals with the condition, in particular, because the PCSK9 monoclonal antibodies, alirocumab and evolocumab, were approved by...

The spectrum of glueballs in 2+1 dimensions is calculated within an extended class of Isgur-Paton flux tube models and is compared to lattice calculations of the low-lying SU(N ≥ 2) glueball mass spectrum. Our modifications of the model include a string curvature term and different ways of dealing with the flux tube width. We find that the generic model is remarkably successful at reproducing t...

We introduce a differential refinement of Cohomotopy cohomology theory, defined on Penrose diagram spacetimes, whose cocycle spaces are unordered configuration points. First we prove that brane charge quantization in this 4-Cohomotopy theory implies intersecting p/(p+2)-brane moduli given by ordered configurations points the transversal 3-space. Then show higher (co-)observables these moduli, c...