Searching for primordial localized features with CMB and LSS spectra

@article{Hu2015SearchingFP,
  title={Searching for primordial localized features with CMB and LSS spectra},
  author={Bin Hu and Jes'us Torrado},
  journal={Physical Review D},
  year={2015},
  volume={91},
  pages={064039}
}
Inspired by the study of mild transient reductions in the speed of sound of the adiabatic mode during inflation, we search for a primordial localized feature imprinted in cosmic microwave background and large-scale structure formation observables. We find some common oscillatory patterns both in the Planck CMB temperature-temperature power spectrum and the WiggleZ galaxy spectrum. By performing independent searches with these two data sets, we find a coincidence in the most significant mode… 

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References

SHOWING 1-10 OF 78 REFERENCES

55

: Substantial progress in our understanding of human response to thermal environments has been made since Standard 55- 1992, including the amendment 55-95a. Incorporating many of these advances,

Phys

  • Rev. D 89, 103006
  • 2014

Phys

  • Rev. D 90, 023511
  • 2014

Phys

  • Rev. D 84, 043502
  • 2011

Astropart

  • Phys. 12
  • 2013

Astropart

  • Phys. 10
  • 2013

Astropart

  • Phys. 06
  • 2010

Astrophys

  • J. 538, 473
  • 2000

JCAP 0804

  • 010
  • 2008
...