Expediente, v. 03, n. 05, jun. 2017

ar X iv : h ep - p h / 05 03 26 3 v 2 3 N ov 2 00 5

The factorization properties of the radiative decays B → V γ are analyzed at leading order in 1/mb using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B → V form factor evaluated at q2 = 0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effect...

0 50 20 03 v 2 1 3 Ju n 20 05 Noncommutative Configuration Space . Classical and Quantum Mechanical Aspects ∗

In this work we examine noncommutativity of position coordinates in classical symplectic mechanics and its quantisation. In coordinates {q i , p k } the canonical symplectic two-form is ω 0 = dq i ∧ dp i. It is well known in symplectic mechanics [5, 6, 9] that the interaction of a charged particle with a magnetic field can be described in a Hamil-tonian formalism without a choice of a potential...

Diplomarbeit Finale Endversion_2011-05-03

$n$-cocoherent rings‎, ‎$n$-cosemihereditary rings and $n$-V-rings

 Let $R$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎A right $R$-module $M$ is called $(n‎, ‎d)$-projective if $Ext^{d+1}_R(M‎, ‎A)=0$ for every $n$-copresented right $R$-module $A$‎. ‎$R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $R$-module is $(n‎, ‎d)$-projective‎. ‎$R$...

ar X iv : h ep - t h / 03 05 13 6 v 3 1 3 Ju n 20 03 TOPOLOGICAL CORRELATORS IN LANDAU - GINZBURG MODELS WITH BOUNDARIES

We compute topological correlators in Landau-Ginzburg models on a Riemann surface with arbitrary number of handles and boundaries. The boundaries may correspond to arbitrary topological D-branes of type B. We also allow arbitrary operator insertions on the boundary and in the bulk. The answer is given by an explicit formula which can be regarded as an open-string generalization of C. Vafa’s for...