The Atacama Cosmology Telescope: Detection of the Power Spectrum of CMB Lensing

  • Das S
  • Sherwin B
  • Aguirre P
 et al. 
  • 5


    Mendeley users who have this article in their library.
  • N/A


    Citations of this article.


We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2-degree angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda Cold Dark Matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4-sigma detection of the lensing signal measures the amplitude of density fluctuations to 12%.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Sudeep Das

  • Blake D Sherwin

  • Paula Aguirre

  • John W Appel

  • J Richard Bond

  • C Sofia Carvalho

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free