|
|||||
|
|
Weak gravitational lensing by voids |
|
| Authors: | Luca Amendola Joshua A. Frieman Ioav Waga |
| Affiliation: | NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA; Osservatorio Astronomico di Roma, V. del Parco Mellini, 84, 00136 Roma, Italy; Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60637, USA; Universidade Federal do Rio de Janeiro, Instituto de Fúsica, Rio de Janeiro, RJ 21945-970, Brazil |
| Abstract: | We consider the prospects for detecting weak gravitational lensing by underdensities (voids) in the large-scale matter distribution. We derive the basic expressions for magnification and distortion by spherical voids. Clustering of the background sources and cosmic variance are the main factors that limit in principle the detection of lensing by voids. We conclude that only voids with radii larger than ∼100 h |
| Keywords: | cosmology: theory gravitational lensing |