Are Domain Walls ruled out ?
| dc.creator | Conversi, Luca | |
| dc.creator | Melchiorri, Alessandro | |
| dc.creator | Mersini, Laura | |
| dc.creator | Silk, Joseph | |
| dc.date | 2004-02-23 | |
| dc.date.accessioned | 2026-07-07T10:27:11Z | |
| dc.date.available | 2026-07-07T10:27:11Z | |
| dc.description | Recent analysis of the combined data of cosmic microwave background, galaxy clustering and supernovae type Ia observations have set strong constraints on the equation of state parameter $w_X$. The upper bound $w_X < -0.82$ at 95% c.l. rules out an important class of models, the domain walls ($-2/3 < w_X < -1/3$). Here we revisit the issue of domain walls as a possible alternative to the standard $Λ$-CDM model by questioning the assumptions made in the choice of priors of the data analysis. The results of our investigation show that domain walls can provide a good fit to the WMAP data for a different choice of priors with ``lower'' values of the Hubble parameter ($h<0.65$), (as indicated by Sunyaev-Zeldovich and time delays for gravitational lensing observations), and ``higher'' values of the matter density ($Ω_m > 0.35$), (in agreement with recent measurements of the temperature-luminosity relation of distant clusters observed with the XMM-Newton satellite). In this new perspective, their existence would lead to important implications for the CMB constraints on cosmological and inflationary parameters. | |
| dc.description | 6 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0402529 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0402529 | |
| dc.identifier | Astropart.Phys.21:443-449,2004 | |
| dc.identifier | doi:10.1016/j.astropartphys.2004.02.006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177079 | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Are Domain Walls ruled out ? | |
| dc.type | text |