Year: 2011
Type: article
Abstract: 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 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 detection of the lensing signal measures the amplitude of density fluctuations to 12%.
Source: Physics
DOI: 10.1103/physics.4.53
Author: Stephen Boughn
Institution: Haverford College
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Aeronautics and Space Administration, Princeton University, University of Pennsylvania, Research Councils UK, Kavli Institute for Cosmological Physics, University of Chicago, Natural Sciences and Engineering Research Council of Canada, Comisión Nacional de Investigación Científica y Tecnológica, Fondo de Financiamiento de Centros de Investigación en Áreas Prioritarias, SLAC National Accelerator Laboratory
Awards: Center for Cosmological Physics, Galaxy Cluster Velocities and Cosmology, Gravitational Physics from the Cosmic Microwave Background, Gravitational Turbulence and Star Formation, Collaborative Research with the Atacama Cosmology Telescope (ACT): Probing Fundamental Physics Through Observations of Cosmic Structure, Optical Observations of the ACT Sky Region, WMAP HAS PLAYED A MAJOR ROLE IN ESTABLISHING A STANDARD MODEL FOR COSMOLOGY. WHILE IT CAN EXPLAIN A
OpenAlex ID: W2069092017