Atoms and photons: kinetic equations with delay

V. V. Uchaikin

Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Proceedings of the IV International Scientific Conference "Actual Problems of Applied Mathematics". Kabardino-Balkar Republic, Nalchik, Elbrus Region, May 22–26, 2018. Part III, Tome 167 (2019), pp. 62-96.

Résumé

In his recent works, the author drew attention to the fact that extraction of a part of a closed Hamiltonian system turns the original well-known Liouville differential equation into an integro-differential equation with a delayed time argument, which describes the dynamics of the selected subsystem considered as an open system. It was shown that the integral operator can be represented in the form of a fractional differential operator of distributed order. In this paper, we show how the kinetic theory of the system "atoms$+$photons" is transformed for the subsystem consisting of excited atoms. We present the derivation of the telegraph equation with delay, derive the Bieberman–Holstein equation in the fractional differential form (with the fractional Laplace operator), and discuss boundary effects in the nonlocal transport model. The final section is devoted to laser technologies, which include free electron lasers and laser cooling of atoms.

Détail

Mots-clés : balance equation
Keywords: radiation trapping, frequency redistribution, telegraph equation, laser beam, fractal medium.

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