Opposite momenta lead to opposite directions

Opposite momenta lead to opposite directions

When a particle decays into two fragments, the wavefunctions of the latter are spherical shells with expanding radii. In spite of this spherical symmetry, the two particles can be detected only in opposite directions. When particles at rest decay into two fragments, the latter have opposite momenta, p1 + p2 = 0. (1) Yet, the statistical distribution of each fragment is isotropic. The same holds...

Collisions between optical spatial solitons propagating in opposite directions.

We formulate the theory describing the evolution and interactions between optical spatial solitons that propagate in opposite directions. We show that coherent collisions between counterpropagating solitons give rise to a new focusing mechanism resulting from the interference between the beams, and that interactions between such solitons are insensitive to the relative phase between the beams.

Reduplication in Tupi-Guarani languages: going into opposite directions

The aim of this paper is to investigate verbal stem reduplication in several Tupi-Guarani languages. The study reports mostly on Emerillon, for which the author collected field data in French Guiana, but also on other TupiGuarani languages: Wayampi of French Guiana (Grenand 1980, 1989; Ganozzi, p.c.), Tupinamba (Rodrigues A. 1953), Kamaiura (Seki 2000), Brazilian Wayampi (Jensen 1989), Anambé (...

Co-existing heat currents in opposite directions in graphene nanoribbons

Valence biases factual and counterfactual learning in opposite directions

Previous studies suggest that factual learning, that is, learning from obtained outcomes, is biased, such that participants preferentially take into account positive, as compared to negative, prediction errors. However, whether or not the prediction error valence also affects counterfactual learning, that is, learning from forgone outcomes, is unknown. To address this question, we analysed the ...