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GR: Fachverband Gravitation und Relativitätstheorie

GR 12: Cosmology

GR 12.5: Vortrag

Donnerstag, 2. April 2020, 15:00–15:15, H-HS IV

Intensity Mapping observables of cosmology — •Caroline Heneka — Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy

Intensity Mapping (IM) techniques target the Universe from present time up to redshifts beyond ten when the first galaxies formed, from small to largest scales. Similar to CMB measurements, power spectra of emission line fluctuations tell about structure growth and underlying cosmology; but imagine the information encoded in thousands of intensity maps at varying redshifts and for multiple emission lines.

In this talk I will review IM as a test for cosmology and fundamental physics during the dark ages and the epoch of reionization, with power and cross-power spectra (suitable for multi-messenger methods) and global temperature signals probing cosmological structure formation, properties of dark matter and of astrophysical sources. As examples cosmological volumes of line fluctuations and their global temperature signal in general modified gravity scenarios are highlighted to measure deviations from the gravitational constant G and a possible dark matter -- dark energy coupling. The ability of upcoming surveys like the SKA to constrain these modifications is demonstrated.