Rights: © 2006 American Physical Society (APS). This is the accepted version of the following article: Makkonen, I. & Hakala, M. & Puska, Martti J. 2006. Modeling the momentum distributions of annihilating electron-positron pairs in solids. Physical Review B. Volume 73, Issue 3. 035103/1-12. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.73.035103, which has been published in final form at ...

It is well-known that the composition of a D-finite function with an algebraic function is again D-finite. We give the first estimates for the orders and the degrees of annihilating operators for the compositions. We find that the analysis of removable singularities leads to an order-degree curve which is much more accurate than the order-degree curve obtained from the usual linear algebra reas...

We generalize nonperturbative renormalization group methods to nonequilibrium critical phenomena. Within this formalism, reaction-diffusion processes are described by a scale-dependent effective action, the flow of which is derived. We investigate branching and annihilating random walks with an odd number of offspring. Along with recovering their universal physics (described by the directed per...

The effects of freeze/thaw (F/T) cycling on the structure of dry Nafion® membranes were investigated using positron annihilation lifetime spectroscopy (PALS). The method correlates the lifetime and relative intensity of positrons (anti-electrons) annihilating in the open-volume voids of the membrane with void size and void volume fraction. The results, though still preliminary, show freeze/thaw...

Given an affine Kac-Moody Lie algebra g̃[σ] of arbitrary type, we determine certain minimal sets of annihilating fields of standard g̃[σ]-modules. We then use these sets in order to obtain a characterization of standard g̃[σ]modules in terms of irreducible loop g̃[σ]-modules, which proves to be a useful tool for combinatorial constructions of bases for standard g̃[σ]-modules.

Abstract Finite-rate-of-innovation (FRI) is a framework that has been developed for the sampling and reconstruction of specific classes of signals, in particular non-bandlimited signals that are characterized by finitely many parameters. It has been shown that by using specific sampling kernels that reproduce polynomials or exponentials (i.e., satisfy Strang-Fix condition), it is possible to de...

Recent results from the PAMELA [1], ATIC [2] , PPB BETS [3] and Fermi [4] collaborations extend the energy range in the e, e measurement up to unexplored energies in the hundred GeVs range confirming the bump starting at about 10GeV already suggested by HEAT [5] and AMS01 data [6]. This bump can be explained by annihilating dark matter in the context of exotic physics, or by nearby astrophysica...