Abstract
Noncommutative phase space is one of the widely studied extensions of ordinary phase space, and has profound implications in cosmological physics. In this paper we study the dynamics of perfect fluid on noncommutative phase space, as well as deformations of the Friedmann equation. The Lagrangian formalism is used to take into account of the phase space noncommutativities. Then a map from canonical Lagrangian variables to Eulerian variables is employed to derive the equations of motion of the mass and current densities. We find that both these two equations receive noncommutative corrections that are linear in the noncommutative parameters. However, we also find that in the approximation of vanishing comoving velocity the leading order noncommutative correction due to momentum noncommutativity on the Friedmann equation is zero.
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Acknowledgements
K. M. is supported by the National Natural Science Foundation of China under Grant No. 11705113, and partially supported by the Natural Science Basic Research Plan in Shaanxi Province of China under Grant No. 2017JM1032.
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Ren, YJ., Ma, K. Deformations of Fluid Dynamics and Friedmann Equation on Noncommutative Phase Space. Int J Theor Phys 57, 3373–3380 (2018). https://doi.org/10.1007/s10773-018-3850-z
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DOI: https://doi.org/10.1007/s10773-018-3850-z