Speaker
Description
Although the presence of oscillations in fuzzy dark matter (FDM) cores has been noted previously [1-3], e.g. effects of core oscillations on the structure and dynamics of galaxies [2,3], and limits on the constituent boson mass [1], some open questions remain.
Here, we investigate the dynamics and properties of FDM core oscillations both in the absence and presence of self-interactions. We perform an exact analytical study of the oscillation frequency of perturbed ground-state non-interacting soliton cores, inspired by the approach taken in [4], and compare with numerical Gross-Pitaevskii-Poisson simulations. Instead of a Gaussian ansatz, we make use of the empirical fitting formula from [5] to analytically solve for the oscillation frequencies. Our numerical and analytical studies find qualitative agreement with results from [4], but with clearly identifiable corrections, with further adjustments made for the presence of self-interaction.
References:
[1] D.J. Marsh and J.C. Niemeyer, Phys. Rev. Lett., 123, 051103 (2019)
[2] B. V. Church, P. Mocz, and J. P. Ostriker, Mon. Not. R. Astron. Soc. ** 485, 2861 (2019)
[3] X. Li, L. Hui, and T. D. Yavetz, Phys. Rev. D. 103, 023508 (2019)
[4] P.-H. Chavanis, Phys. Rev. D - Part. Fields, Gravit. Cosmol. 84, 1 (2011)
[5] H. Y. Schive, T. Chiueh, and T. Broadhurst, Nat. Phys. 10**, 496 (2014)
