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O P S is grateful to the Universidad Autonoma and to the ICMAT in Madrid, where this work was performed, by their hospitality. The present work is supported by CONICET, Argentina and by the Grant PICT 2020-02181. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 777822. F Ch is partially supported by the PID2020-113350GB-I00 grant of the MICINN (Spain) and by Severo Ochoa Programme for Centres of Excellence in R & D' (CEX2019-000904-S).

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About the quantum Talbot effect on the sphere

Publicado en:Journal of Physics A-Mathematical and Theoretical. 56 (25): 020501- - 2023-06-23 56(25), DOI: 10.1088/1751-8121/acd489

Autores: Chamizo, F.; Santillán, O.P.

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The Schrodinger equation on a circle with an initially localized profile of the wave function is known to give rise to revivals or replications, where the probability density of the particle is partially reproduced at rational times. As a consequence of the convolutional form of the general solution it is deduced that a piecewise constant initial wave function remains piecewise constant at rational times as well. For a sphere instead, it is known that this piecewise revival does not necessarily occur, indeed the wave function becomes singular at some specific locations at rational times. It may be desirable to study the same problem, but with an initial condition being a localized Dirac delta instead of a piecewise constant function, and this is the purpose of the present work. By use of certain summation formulas for the Legendre polynomials together with properties of Gaussian sums, it is found that revivals on the sphere occur at rational times for some specific locations, and the structure of singularities of the resulting wave function is characterized in detail. In addition, a partial study of the regions where the density vanishes, named before valley of shadows in the context of the circle, is initiated here. It is suggested that, differently from the circle case, these regions are not lines but instead some specific set of points along the sphere. A conjecture about the precise form of this set is stated and the intuition behind it is clarified.

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