Kinetic field theory for cosmic structure formation
العنوان: | Kinetic field theory for cosmic structure formation |
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المؤلفون: | Sara Konrad, Matthias Bartelmann |
المصدر: | La Rivista del Nuovo Cimento. 45:737-799 |
بيانات النشر: | Springer Science and Business Media LLC, 2022. |
سنة النشر: | 2022 |
مصطلحات موضوعية: | Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics |
الوصف: | We apply kinetic field theory to non-linear cosmic structure formation. Kinetic field theory decomposes the cosmic density field into particles and follows their trajectories through phase space. We assume that initial particle momenta are drawn from a Gaussian random field. We place particular emphasis on the late-time, asymptotic behaviour on small spatial scales of low-order statistical measures for the distribution of particles in configuration and velocity space. Our main result is that the power spectra for density and velocity fluctuations in ensembles of particles freely streaming along Zel'dovich trajectories asymptotically fall off with wave number $k$ like $k^{-3}$ for $k\to\infty$, irrespective of the cosmological model and the type of dark matter assumed, with the exponent set only by the number of spatial dimensions. This conclusion remains valid for density-fluctuation power spectra if particle interactions are taken into account in a mean-field approximation. We also show that the bispectrum of freely-streaming particles falls off asymptotically like $k^{-11/2}$ under the same general conditions. Comment: 64 pages, 25 figures, draft prepared for submission to La Rivista del Nuovo Cimento |
تدمد: | 1826-9850 0393-697X |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::526cfdf107ef3e956a1f47fb56ab9f74 https://doi.org/10.1007/s40766-022-00037-y |
حقوق: | OPEN |
رقم الأكسشن: | edsair.doi.dedup.....526cfdf107ef3e956a1f47fb56ab9f74 |
قاعدة البيانات: | OpenAIRE |
تدمد: | 18269850 0393697X |
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