Speaker
Description
Intensity Mapping (IM) of line emission targets the Universe from present
time up to redshifts beyond ten when the Universe reionized and the first
galaxies formed, from small to largest scales. Similar to CMB measurements,
the power spectra of intensity fluctuations inform about the underlying cosmology;
imagine the information encoded in thousands of intensity maps at
different redshifts and for multiple emission lines, forming full tomographic
lightcones. In this talk I review IM as a test for cosmology and fundamental
physics during cosmic dawn and the epoch of reionization. I show how power
and cross-power spectra as well as global temperature measurements probe
our cosmology, properties of dark matter and of astrophysical sources. The
measurement of deviations from the gravitational constant G and a possible
dark matter – dark energy coupling are highlighted in general modified gravity
scenarios. The ability of upcoming instruments like the SKA to constrain
these modifications is demonstrated. If time permits, going beyond ’traditional’ summary statistics, I furthermore show how neural networks are able to directly
infer e.g. dark matter and astrophysical properties from such tomographic
line fluctuation lightcones without an underlying Gaussian assumption.
| Do you wish to attend the workshop on-site? | no |
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