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QuasinormalModes.jl is a Julia package for computing the quasinormal modes ofany General Relativity model whose perturbation equation can be expressed assecond order homogeneous ODE. Not only that, the package can be used to computethe discrete eigenvalues of any second order homogeneous ODE (such as theenergy eigenstates of the time independent Schr\"odinger equation) providedthat these eigenvalues actually exist. The package features a flexible and userfriendly API where the user simply needs to provide the coefficients of theproblem ODE after incorporating boundary and asymptotic conditions on it. Theuser can also choose to use machine or arbitrary precision arithmetic for theunderlying floating point operations involved and whether or not to docomputations sequentially or in parallel using threads. The API also tries notto force any particular workflow on the users so that they can incorporate andadapt the existing functionality on their research pipelines without unwantedintrusions.

QuasinormalModes.jl: A Julia package for computing discrete eigenvalues of second order ODEs