406 research outputs found
Relativistic Quantum Scattering on a Cone
We study the relativistic quantum mechanical scattering of a bosonic particle
by an infinite straight cosmic string, considering the non-minimal coupling
between the bosonic field and the scalar curvature. In this case, an effective
two-dimensional delta-function interaction takes place besides the usual
topological scattering and a renormalization procedure is necessary in order to
treat the problem that appears in connection with the delta-function.Comment: 22 pages, LATEX fil
Avaliação agroeconômica de sistemas consorciados de cenoura e rúcula.
Um dos sistemas de cultivo que pode contribuir para a realização de uma agricultura sustentável economicamente é a consorciação de culturas. Estudos coprovam que rendimentos advindos de sistemas consorciados de hortaliças, apresentam-se vantajosos em relação aos obtidos nas culturas soslteiras
Crescimento de plantas de feijão de corda submetidas à irrigação cíclica com água ou solução salina.
Scaling anomaly in cosmic string background
We show that the classical scale symmetry of a particle moving in cosmic
string background is broken upon inequivalent quantization of the classical
system, leading to anomaly. The consequence of this anomaly is the formation of
single bound state in the coupling interval \gamma\in(-1,1). The inequivalent
quantization is characterized by a 1-parameter family of self-adjoint extension
parameter \omega. It has been conjectured that the formation of loosely bound
state in cosmic string background may lead to the so called anomalous
scattering cross section for the particles, which is usually seen in molecular
physics.Comment: 4 pages,1 figur
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