CMB anisotropies from acausal scaling seeds

Abstract

We investigate models where structure formation is initiated by scaling seeds: We consider rapidly expanding relativistic shells of energy and show that they can fit current CMB and large scale structure data if they expand with super-luminal velocities. These acausally expanding shells provide a viable alternative to inflation for cosmological structure formation with the same minimal number of parameters to characterize the initial fluctuations. Causally expanding shells alone cannot fit present data. Hybrid models where causal shells and inflation are mixed also provide good fits.

9 pages,13 figures, revised version accepted for publication in PRD

References in corpus (18)

• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• k-Essence, superluminal propagation, causality and emergent geometry
• High Resolution Observations of the CMB Power Spectrum with ACBAR
• Extended Mosaic Observations with the Cosmic Background Imager
• High resolution CMB power spectrum from the complete ACBAR data set
• A Measurement of the Angular Power Spectrum of the CMB Temperature Anisotropy from the 2003 Flight of Boomerang
• CMB power spectrum contribution from cosmic strings using field-evolution simulations of the Abelian Higgs model
• CMB polarization as a direct test of Inflation
• The power spectra of CMB and density fluctuations seeded by local cosmic strings
• Distinguishing Causal Seeds from Inflation
• Analyze This! A Cosmological Constraint Package for CMBEASY
• WMAP constraints on inflationary models with global defects
• Doppler Peaks in the Angular Power Spectrum of the Cosmic Microwave Background: A Fingerprint of Topological Defects
• A Causal Source which Mimics Inflation
• CMBEASY:: an Object Oriented Code for the Cosmic Microwave Background
• Reproducing the observed Cosmic microwave background anisotropies with causal scaling seeds

Cited by in corpus (7)

• Cosmology and Fundamental Physics with the Euclid Satellite
• Cosmology and fundamental physics with the Euclid satellite
• Constraining $f(R)$ gravity by the Large Scale Structure
• Cosmic string parameter constraints and model analysis using small scale Cosmic Microwave Background data
• The local B-polarization of the CMB: a very sensitive probe of cosmic defects
• Cosmic Microwave Background temperature and polarization anisotropies from the large-N limit of global defects
• A dark energy view of inflation