Speaker
Dr
Daniele Bertacca
Description
Since the 1970s, the size of galaxy catalogs has constantly increased in
terms of solid-angle and redshift coverage as well as in sampling rate.
The next generation of surveys will provide us with the possibility to
measure galaxy clustering on scales comparable with the Hubble radius (for
example: Euclid, DESI, SKAII, etc.). Theoretical analysis suggests that
several relativistic effects might be detectable on these scales. In order
to fully exploit the potential of the new datasets, it is therefore
imperative to develop analysis tools that include these effects. I have
developed a fully general relativistic formalism which recovers and
generalizes previous results in the plane-parallel (at-sky) and Newtonian
wide-angle approximations.
These corrections become important on large scales both at low and high
redshifts, and lead to new terms in the wide-angle correlations. Now we
need to work out how to apply this formalism for real data and understand
which cosmological parameters are particularly affected. This will be
important for future surveys and to guide the development on the next
generation of large astrophysical experiments.
| Overview or Regular Talk? | Regular: 45 min. |
|---|
Primary author
Dr
Daniele Bertacca
(Argelander Institute of Astrophysics, Bonn University, Germany)
