Matthew Johnson
Perimeter Inst. Theoretical Physics (Waterloo, Canada)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Fundamental Physics from Secondary CMB Anisotropies » |
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Matthew Johnson |
| A major frontier in cosmic microwave background (CMB) science is the study of secondary anisotropies—temperature and polarization anisotropies induced by the gravitational, electromagnetic, or beyond-standard-model (BSM) interactions of CMB photons with large-scale structure (LSS) over cosmic history. Leveraging their distinct statistical properties and cross-correlations with LSS enables us to isolate these secondary anisotropies from the primary CMB and extract new astrophysical and cosmological information. In this talk, I discuss how secondary anisotropies from electromagnetic interactions (Sunyaev-Zel’dovich effects) and hypothetical BSM particles (dark photons and axions) can serve as probes of fundamental physics. I present constraints derived from Planck and the unWISE galaxy catalog which provide the tightest existing limits on the relative velocity between the CMB and LSS rest frames, as well as on dark photons in the peV mass range. Additionally, I highlight how these data sets constrain primordial non-Gaussianity, isocurvature, primordial gravitational waves, and axions. Looking ahead to the high-resolution, low-noise, large-volume frontier, I discuss how upcoming observations from the Simons Observatory, combined with LSS surveys like DESI and Euclid, will significantly improve these results and allow for novel new tests of fundamental physics. |
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vendredi 14 mars 2025 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |