MR. ADITYA ROTTI

The currently accepted ¿CDM model of Cosmology is built on the assumption that the universe is isotropic. This assumption needs to be rigorously tested and the CMB temperature anisotropy measurement is an ideal data set for this task. The PLANCK satellite has measured these anisotropies with unprecedented accuracy, resolution and sky coverage. In the absence of the assumption about the isotropic nature of the universe, the CMB two point correlation function can be most generally decomposed into a direction independent part and a direction dependent part. The direction independent part of the two point correlation function (better known as the CMB angular power spectrum) has been extensively studied. A measurement of the direction dependent part of the correlation function can be used to reconstruct the large scale structure surrounding us. Further it can also be used to test the isotropic nature of the universe. Both these tasks have been carried out on PLANCK data and have yielded interesting results. In the talk, the speaker will provide an overview of the wealth of information that can be extracted by studying the direction dependent part of the CMB two point correlation function and discuss some of the interesting results from PLANCK.