The use of the spectral derivative method in Near Infrared optical spectroscopy and tomographic imaging is presented, whereby instead of using discrete measurements around several wavelengths, the difference between nearest neighboring spectral measurements is used. The proposed technique is shown to be insensitive to the unknown tissue and fiber contact coupling coefficients providing substant...

Based on considerations in conformal gauge I derive up to nextleading order a relation between the coefficients of β-functions in 2D renormalizable field theories before and after coupling to quantized gravity. The result implies a coupling constant dependence of the ratio of both β-functions beyond leading order.

We calculate the perturbative correction to every cluster coefficient of a gas of anyons through second order in the anyon coupling constant, as described by Chern-Simons field theory.

We consider the non-commutative generalization of the chiral perturbation theory. The resultant coupling constants are severely restricted by the model and in good agreement with the data. When applied to the Skyrme model, our scheme reproduces the non-Skyrme term with the right coefficient. We comment on a similar treatment of the linear σ-model. [email protected] [email protected]

We extract the strong coupling constant α s (m 2 τ) from the semileptonic τ decay width taking into account resummation effects from the running of the strong coupling constant. In the MS scheme the result reads α s = 0.375 ± 0.007 to third order and α s = 0.378 ± 0.007 to fourth order in the β-function, respectively, where we use the recently computed four-loop coefficient β 3. These values fo...

The universality of radiative corrections to the gauge coupling constant k of ChernSimons theory is studied in a very general regularization scheme. We show that the effective coupling constant k induced by radiative corrections depends crucially on the balance between the ultraviolet behavior of scalar and pseudoscalar terms in the regularized action. There are three different regimes. When th...

We consider many-particle diffusion in 2D colloidal suspensions with hydrodynamic interactions within a mode-coupling approach. We focus on the behaviour of the effective scaled collective diffusion coefficient DC(ρ)/D0 as a function of the density of the colloids ρ, where D0 is the single-particle diffusion coefficient. We find that DC(ρ) is strongly coupled to hydrodynamical conservation laws...

From the equations of motion for baryons in the scalar strong interaction hadron theory (SSI), two coupled third order radial wave equations for baryon doublets have been derived and published in 1994. These equations are solved numerically here, using quark masses obtained from meson spectra and the masses of the neutron,  and  as input. Confined wave functions dependent upon the quark-diqua...