Quantum noises and the large scale structure

Wo Lung Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We propose that cosmological density perturbation may originate from passive fluctuations of the inflaton, which are induced by colored quantum noise due to the coupling of the inflaton to the quantum environment. At small scales, the fluctuations grow with time to become nearly scale-invariant. However, the larger-scale modes cross out the horizon earlier and do not have enough time to grow, thus resulting in a suppression of the density perturbation. This may explain the observed low quadrupole in the CMB anisotropy data and and potentially unveil the initial time of inflation. We also discuss the implications to the running spectral index and the non-Gaussianity of the primordial density perturbation.

Original languageEnglish
Pages (from-to)1945-1952
Number of pages8
JournalModern Physics Letters A
Issue number25-28
Publication statusPublished - 2007


  • Cosmic microwave background
  • Inflationary cosmology
  • Large-scale structure of the universe

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics
  • General Physics and Astronomy


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