Mohammad Hossein Jamshidi

Department of Physics, Shahid Beheshti University

Cap anomaly in the CMB

Abstract: The standard model of cosmology has explained lots of features of the CMB accurately. This model is based on the so-called cosmological principle which states that the distributions of matter and light in the universe are homogeneous and isotropic at any epoch. Nevertheless, there are different well known anomalies in the statistical features of the CMB. Among all these, of more interest for us is directional dependencies of the CMB statistics. One of them is modeled in terms of a dipole modulation in the CMB temperature and a dipole in the amplitude of CMB fluctuations. Having a pure dipole modulation in the CMB sky seems to require fine-tuning. So there is a need to study this anomaly in more detail. In our recent study on Planck data, we have studied caps instead of hemispheres by using variance-based probes and We have found that the anomaly in the CMB temperature modulations is more severe on some particular spherical caps than that of the hemisphere.

یکشنبه  14 آبان 1402، ساعت 17:15

Sunday 5 November 2023 – 17:15 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 3 Physics Department – first floor – Room Physics 3  / 

https://vc.sharif.edu/ch/cosmology

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