WMAP constraints on the Cardassian model

2003/03/17 by Anjan A. Sen, A. A. Sen, S. Sen +1 · 4 citations
Mathematics · Physics and Astronomy · #Anisotropy #Astronomy #Astrophysics #Black Holes and Theoretical Physics #CMB cold spot #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Hubble's law #Lambda #Mathematics #Physics #Planck #Quantum mechanics #Spectral density #Spectral index #Spectral line #Statistics #Supernova #astro-ph

paper · pdf · doi:10.1103/physrevd.68.023513

published as Phys.Rev. D68 (2003) 023513 · 9 pages, Revtex format, 4 eps figures

arxiv created 2003/03/17 · openalex publication_date 2003/07/23 · arxiv updated 2016/08/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate the constraints on the Cardassian model using the recent results from the Wilkinson microwave anisotropy probe for the locations of the peaks of the cosmic microwave background (CMB) anisotropy spectrum. We find that the model is consistent with the recent observational data for a certain range of the model parameter n and the cosmological parameters. We find that the Cardassian model is favored compared to the \ensuremathΛCDM model for a higher spectral index (n_s\ensuremath≈1) together with a lower value of the Hubble parameter h (h<~0.71). But for smaller values of n_s, both \ensuremathΛCDM and Cardassian models are equally favored. Also, irrespective of supernova constraints, CMB data alone predict the current acceleration of the Universe in this model. We have also studied the constraint on \ensuremathσ₈, the rms density fluctuations at the 8h^\ensuremath-1Mpc scale.

Citations

• Generalized Chaplygin gas and cosmic microwave background radiation constraints
• Constraints on Cosmological Models from [ITAL]Hubble Space Telescope[/ITAL] Observations of High-[CLC][ITAL]z[/ITAL][/CLC] Supernovae
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Cosmology with a time-variable cosmological 'constant'
• Observational Constraints on Cardassian Expansion
• Cosmic acceleration without quintessence
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Generalized Chaplygin gas, accelerated expansion, and dark-energy-matter unification
• A flat Universe from high-resolution maps of the cosmic microwave background radiation
• Cosmological consequences of a rolling homogeneous scalar field

Cited by

• Constraints on Cardassian expansion
• Observational Constraints on Cosmology from the Modified Friedmann Equation
• Probing the evolution of the dark energy density with future supernova surveys
• CMB spectrum in Cardassian models