A perspective on the CMB acoustic peak
| dc.creator | Marriage, T. A. | |
| dc.date | 2002-03-11 | |
| dc.date.accessioned | 2026-07-07T02:03:04Z | |
| dc.date.available | 2026-07-07T02:03:04Z | |
| dc.description | CMB angular spectrum measurements suggest a flat universe. This paper clarifies the relation between geometry and the spherical harmonic index of the first acoustic peak ($\ell_{peak}$). Numerical and analytic calculations show that $\ell_{peak}$ is approximately a function of $Ω_K/Ω_M$ where $Ω_K$ and $Ω_M$ are the curvature ($Ω_K > 0$ implies an open geometry) and mass density today in units of critical density. Assuming $Ω_K/Ω_M \ll 1$, one obtains a simple formula for $\ell_{peak}$, the derivation of which gives another perspective on the widely-recognized $Ω_M$-$Ω_Λ$ degeneracy in flat models. This formula for near-flat cosmogonies together with current angular spectrum data yields familiar parameter constraints. | |
| dc.description | 4 pages; submitted to ApJ Letters | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0203153 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0203153 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/4263 | |
| dc.subject | Astrophysics | |
| dc.title | A perspective on the CMB acoustic peak | |
| dc.type | text |