Cosmological Parameters

Measurements from Large-Scale Structure & Cosmic Microwave Background experiments
  • E. Gaztañga
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 276)


We present a brief introduction to the problem of large scale structure formation and how it relates to the cosmological parameters and to the physics of the early Universe. As an illustration, we also discuss recent observations of the CMB fluctuations (eg Boomerang and Maxima) which show an anomalously low second acoustic peak, which was initially interpreted as an indication of a high primordial Big-Bang nucleosynthesis (BBN) baryon density. We argue that this low peak can also be caused by ‘step’ in the primordial spectrum induced by a spontaneous symmetry breaking phase transition during primordial inflation. We demonstrate that a deviation from scale-invariance around k ∼ O.lhMpc−1 can simultaneously explain both the feature identified earlier in the APM galaxy power spectrum as well the recent CMB anisotropy data, with a baryon density consistent with the BBN value.


Cosmic Microwave Background Cold Dark Matter Cosmological Parameter Baryon Density Inflaton Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • E. Gaztañga
    • 1
    • 2
  1. 1.Astrofísica, TonantzintlaINAOEPueblaMexico
  2. 2.Edif. NexuxIEEC, CSICBarcelonaSpain

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