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Primordial gravity waves and weak lensing.

Scott Dodelson1, Eduardo Rozo, Albert Stebbins

  • 1NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.

Physical Review Letters
|August 9, 2003
PubMed
Summary
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Primordial gravity waves from inflation leave a subtle signature in the large-scale cosmic shear field. Detecting this subtle curl mode, a unique indicator of inflation, remains challenging due to its extremely low signal-to-noise ratio.

Area of Science:

  • Cosmology
  • Astrophysics
  • General Relativity

Background:

  • Inflation theory predicts primordial gravity waves alongside density perturbations.
  • These gravity waves could imprint a unique signature on the cosmic shear field.

Purpose of the Study:

  • To compute the signature of primordial gravity waves in the large-scale shear field.
  • To assess the detectability of this signature with current and future surveys.

Main Methods:

  • Analysis of the shear field, distinguishing between gradient (E) and curl (B) modes.
  • Calculation of the expected signal strength of the curl mode produced by gravity waves.

Main Results:

  • The expected signal from inflation is very small, peaking at l=2 with l(l+1)C(l)/2pi < 10^-11.

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  • The signal falls rapidly at higher multipoles (smaller scales).

    • Conclusions:

    • The curl mode in cosmic shear is a unique probe of primordial gravity waves and inflation.
    • The predicted signal is significantly below the noise floor of even deep, all-sky surveys.