Abhishek Maniyar
Laboratoire d'Astrophysique de Marseille, Aix-Marseille University
Exposé court
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Résumé : ISW dominates on the larger angular scales in CMB power spectrum but
is limited by cosmic variance. This is why, cross correlation of CMB
with galaxy surveys (which trace the matter distribution up to some
bias) are used to detect the ISW with greater SNR. CIB traces the large
scale structure of the universe. Therefore, we cross-correlate CIB with
CMB and we find that this method could give the best SNR ever obtained
for the measurement of the ISW signal. We also perform a Fisher matrix analysis to see if we can constrain the cosmological parameters with the ISW signal obtained using the above cross-correlation between CIB and CMB. |