Seminar with Dr. Omar Roldán- October 22, 2021 (friday) – 10:15 a.m.
THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:
Aberration and Doppler effect on the CMB: kinematical and intrinsic contributions
Dr. Omar Roldán
Pós-doutorando – UFRJ
Abstract:
The aberration and Doppler coupling effects of the Cosmic Microwave Background (CMB) were measured by the Planck satellite. The most straightforward interpretation leads to a direct detection of our peculiar velocity, consistent with the measurement of the well-known dipole. We show however, that in some cases a primordial dipolar potential can also produce such effects. But in addition it produces other signatures due to integrated terms which we will discuss in some detail. We also discuss how aberration measurements can be used to constraint some models which introduce super-horizon perturbations to explain the hemispherical asymmetry. This work has also been used to infer the Intrinsic Dipole. Finally we also discuss about CMB anisotropies at all orders and the non-linear Sachs-Wolfe formula.
Date: October 22, 2021 – (friday) – Time: 10:15 a.m.
link to access the youtube channel: https://youtu.be/sqea8-jX35Q
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