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The collisionless damping of density fluctuations in an expanding universe
Abstract
Temporal evolution calculations are undertaken for the early universe's initially adiabatic density fluctuation spectrum, by means of the numerical integration of the coupled Einstein-Boltzmann equations for scalar perturbations in the metric and in the density of photons, neutrinos, and collisionless relics. The linear perturbation spectrum is shown to be characterized by two scales, namely the damping mass and the horizon mass, when the energy density in relativistic particles equals that in nonrelativistic ones. For massive neutrinos, both scales are of supercluster size, and the Zel'dovich 'pancake' hypothesis, in which a large scale is the first to collapse, is expected irrespective of initial spectrum. For massive gravitations, the damping mass is of galactic scale.
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Citations
Cited by
Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology
Spergel, D. N., Bean, R., Dore, O., Nolta, M. R., Bennett, C. L., Dunkley, J., Hinshaw, G., Jarosik, N., Komatsu, E., Page, L., et al. (2007) · The Astrophysical Journal Supplement Series · doi:10.1086/513700 · Cited by 6,778
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION
Komatsu, E., Dunkley, J., Nolta, M. R., Bennett, C. L., Gold, B., Hinshaw, G., Jarosik, N., Larson, D., Limon, M., Page, L., et al. (2009) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/180/2/330 · Cited by 5,786
Particle dark matter: evidence, candidates and constraints
Bertone, G., Hooper, D., & Silk, J. (2005) · Physics Reports · doi:10.1016/j.physrep.2004.08.031 · Cited by 4,979
Eisenstein, D. J., Zehavi, I., Hogg, D. W., Scoccimarro, R., Blanton, M. R., Nichol, R. C., Scranton, R., Seo, H., Tegmark, M., Zheng, Z., et al. (2005) · The Astrophysical Journal · doi:10.1086/466512 · Cited by 4,629
Self-citationAlam, S., Ata, M., Bailey, S., Beutler, F., Bizyaev, D., Blazek, J. A., Bolton, A. S., Brownstein, J. R., Burden, A., Chuang, C.-H., et al. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stx721 · Cited by 3,056
Metadata
- Authors
- Bond, J. R., & Szalay, A. S.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1983-11
- Volume
- 274
- Pages
- 443
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1988440864
- Cited by
- 381
- References
- 0
- FWCI
- 19.64
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: The collisionless damping of density fluctuations in an expanding universe. https://app.cochat.ai/papers/10.1086/161460
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- Bond, J. R., & Szalay, A. S. (1983). The collisionless damping of density fluctuations in an expanding universe. The Astrophysical Journal. https://doi.org/10.1086/161460
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
