Cosmic Large-Scale Structure Formation from Newtonian Particle Dynamics
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912196777213952 |
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| author | Daus, Tristan Kozlikin, Elena |
| author_facet | Daus, Tristan Kozlikin, Elena |
| contents | We present results for the cosmic non-linear density-fluctuation power spectrum based on the analytical formalism developed in [1] which allows us to study cosmic structure formation based on Newtonian particle dynamics in phase-space. This framework provides a field-theory approach to a perturbative solution of the BBGKY-hierarchy where the resulting loop-expansion of the theory introduces a natural truncation criterion. We show that we are able to reproduce structure growth on large scales $k \leq 0.2 \mathrm{h}\,\mathrm{Mpc}^{-1}$ to very high precision while on small and intermediate scales we find deviations of the order of $10\%$ from current numerical simulations. The results strongly suggest that a significant improvement may be achieved by restructuring the perturbation theory. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_11676 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmic Large-Scale Structure Formation from Newtonian Particle Dynamics Daus, Tristan Kozlikin, Elena Cosmology and Nongalactic Astrophysics Statistical Mechanics We present results for the cosmic non-linear density-fluctuation power spectrum based on the analytical formalism developed in [1] which allows us to study cosmic structure formation based on Newtonian particle dynamics in phase-space. This framework provides a field-theory approach to a perturbative solution of the BBGKY-hierarchy where the resulting loop-expansion of the theory introduces a natural truncation criterion. We show that we are able to reproduce structure growth on large scales $k \leq 0.2 \mathrm{h}\,\mathrm{Mpc}^{-1}$ to very high precision while on small and intermediate scales we find deviations of the order of $10\%$ from current numerical simulations. The results strongly suggest that a significant improvement may be achieved by restructuring the perturbation theory. |
| title | Cosmic Large-Scale Structure Formation from Newtonian Particle Dynamics |
| topic | Cosmology and Nongalactic Astrophysics Statistical Mechanics |
| url | https://arxiv.org/abs/2501.11676 |