SciPost Submission Page
Elements of cosmology beyond FLRW
by Pierre Fleury
Submission summary
| Authors (as registered SciPost users): | Pierre Fleury |
| Submission information | |
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| Preprint Link: | scipost_202508_00049v2 (pdf) |
| Date accepted: | Nov. 17, 2025 |
| Date submitted: | Oct. 31, 2025, 12:12 p.m. |
| Submitted by: | Pierre Fleury |
| Submitted to: | SciPost Physics Lecture Notes |
| for consideration in Collection: |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
Modern cosmology is based on the cosmological principle, which states that the Universe is statistically homogeneous and isotropic. When applied in its strict — rather than statistical — sense, the cosmological principle leads to the Friedmann—Lemaître—Robertson—Walker (FLRW) model, which serves as background spacetime. This background is used to predict: (1) the dynamics of cosmic expansion; and (2) the kinematics of light propagation through the Universe, which dictates the interpretation of cosmological observations. In this lecture, we shall discuss the performance of the FLRW model for those purposes, and present some results on the so-called backreaction and fitting problems.
List of changes
- corrected minor typos
- added footnote 2 on GLC coordinates and some references
Current status:
Editorial decision:
For Journal SciPost Physics Lecture Notes: Publish
(status: Editorial decision fixed and (if required) accepted by authors)