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Related Experiment Videos

Cross-correlation tomography: measuring dark energy evolution with weak lensing.

Bhuvnesh Jain1, Andy Taylor

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review Letters
|November 13, 2003
PubMed
Summary

This study introduces a new lensing tomography technique to measure dark energy. The method accurately constrains dark energy density and its evolution, crucial for understanding cosmic acceleration.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Gravitational Lensing

Background:

  • Dark energy drives the accelerated expansion of the Universe.
  • Probing dark energy requires precise cosmological measurements.
  • Systematic errors in gravitational lensing are a major challenge.

Purpose of the Study:

  • To develop a robust cross-correlation technique for lensing tomography.
  • To accurately measure dark energy parameters using deep lensing surveys.
  • To mitigate dominant systematic errors in weak lensing measurements.

Main Methods:

  • Developed a cross-correlation technique for lensing tomography.
  • Utilized the variation of weak shear with redshift around foreground galaxies.
  • Employed photometric redshifts from deep lensing surveys.

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Main Results:

  • The technique is robust to dominant systematic errors in lensing.
  • Estimated marginalized accuracies for dark energy density (Omega(de)) and equation of state parameter (w).
  • Achieved sigma(w) ≈ 0.01f(-1/2)(sky) and sigma(w(')) ≈ 0.03f(-1/2)(sky) with a prior of sigma(Omega(de))=0.03.

Conclusions:

  • The developed technique provides a powerful tool for probing dark energy.
  • Deep lensing surveys with photometric redshifts can yield high-precision cosmological constraints.
  • This method advances our understanding of cosmic acceleration and dark energy properties.