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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.02351 |
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| _version_ | 1866912802988359680 |
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| author | Pandey, Biswajit Nandi, Anindita |
| author_facet | Pandey, Biswajit Nandi, Anindita |
| contents | We quantify the physical memory of the cosmic density field using mutual information between $N$-body snapshots at different redshifts, removing a random baseline to isolate gravitational correlations. The shared mutual information rises with scale, peaks near $\simeq L/8$ (where $L$ is the simulation box size), and declines thereafter. This behaviour is robust to box size and discretization, and identifies the largest coherently retained modes unaffected by missing long-wavelength power, establishing a finite-volume limit on the coherence of cosmic structure with direct implications for homogeneity studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_02351 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | An information-theoretic bound on cosmic coherence in finite-volume simulations Pandey, Biswajit Nandi, Anindita Cosmology and Nongalactic Astrophysics We quantify the physical memory of the cosmic density field using mutual information between $N$-body snapshots at different redshifts, removing a random baseline to isolate gravitational correlations. The shared mutual information rises with scale, peaks near $\simeq L/8$ (where $L$ is the simulation box size), and declines thereafter. This behaviour is robust to box size and discretization, and identifies the largest coherently retained modes unaffected by missing long-wavelength power, establishing a finite-volume limit on the coherence of cosmic structure with direct implications for homogeneity studies. |
| title | An information-theoretic bound on cosmic coherence in finite-volume simulations |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.02351 |