Ordinary differential equations

Hill differential equation

In mathematics, the Hill equation or Hill differential equation is the second-order linear ordinary differential equation where is a periodic function by minimal period . By these we mean that for all and and if is a number with , the equation must fail for some . It is named after George William Hill, who introduced it in 1886. Because has period , the Hill equation can be rewritten using the Fourier series of : Important special cases of Hill's equation include the Mathieu equation (in which only the terms corresponding to n = 0, 1 are included) and the Meissner equation. Hill's equation is an important example in the understanding of periodic differential equations. Depending on the exact shape of , solutions may stay bounded for all time, or the amplitude of the oscillations in solutions may grow exponentially. The precise form of the solutions to Hill's equation is described by Floquet theory. Solutions can also be written in terms of Hill determinants. Aside from its original application to lunar stability, the Hill equation appears in many settings including the modeling of a quadrupole mass spectrometer, as the one-dimensional Schrödinger equation of an electron in a crystal, quantum optics of two-level systems, and in accelerator physics. (Wikipedia).

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Related pages

Schrödinger equation | Floquet theory | Mathematics | Ordinary differential equation | Meissner equation | Periodic function | Mathieu function | Fourier series