From Vlasov-Poisson to Schrödinger-Poisson: dark matter simulation with a quantum variational time evolution algorithm
arXiv (Cornell University)(2023)
摘要
Cosmological simulations describing the evolution of density perturbations of
a self-gravitating collisionless Dark Matter (DM) fluid in an expanding
background, provide a powerful tool to follow the formation of cosmic
structures over wide dynamic ranges. The most widely adopted approach, based on
the N-body discretization of the collisionless Vlasov-Poisson (VP) equations,
is hampered by an unfavorable scaling when simulating the wide range of scales
needed to cover at the same time the formation of single galaxies and of the
largest cosmic structures. The dynamics described by the VP equations is
limited by the rapid increase of the number of resolution elements which is
required to simulate an ever growing range of scales. Recent studies showed an
interesting mapping of the 6-dimensional+1 (6D+1) VP problem into a more
amenable 3D+1 non-linear Schrödinger-Poisson (SP) problem for simulating the
evolution of DM perturbations. This opens up the possibility of improving the
scaling of time propagation simulations using quantum computing. In this paper,
we introduce a quantum algorithm for simulating the (SP) equation by adapting a
variational real-time evolution approach to a self-consistent, non-linear,
problem. To achieve this, we designed a novel set of quantum circuits that
establish connections between the solution of the original Poisson equation and
the solution of the corresponding time-dependent Schrödinger equation. We
also analyzed how nonlinearity impacts the variance of observables.
Furthermore, we explored how the spatial resolution behaves as the SP dynamics
approaches the classical limit and discovered an empirical logarithmic
relationship between the required number of qubits and the scale of the SP
equation. This entire approach holds the potential to serve as an efficient
alternative for solving the Vlasov-Poisson (VP) equation by means of classical
algorithms.
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关键词
dark matter simulation,dark matter,quantum,vlasov-poisson,odinger-poisson
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