2007/07/01 by David H. Oaknin, Oaknin, David H.
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Physics - Theory (hep-th) #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.0707.0121
Discussion about causality constrains expanded. In this new version the assumption of fluid incompressibility has been eliminated. Abstract revised. Conclusions unchanged
openalex publication_date 2007/07/01 · arxiv created 2008/10/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The most distinctive feature of the primordial density inhomogeneities that existed in the cosmic plasma at the instant of decoupling is their scale invariant power spectrum \cal P(k) ∼ k over the range k ≪ Heq of modes with cosmologically large comoving wavelength. We characterize this feature in real space, in terms of their correlation function at two points. We show that over cosmologically large comoving distances r ≫ H-1eq the primordial inhomogeneities were (anti)correlated as f(r) ∼ - r-4. We revisit the so-called \it origin of structures problem of the standard cosmology at the light of this observation. Our conclusions contradict the current wisdom on this issue.