Speaker at the Universidad Autónoma de Madrid

Activity: Talk or presentation typesInvited talk

Description of Activity

Gave a presentation entitled 'A Cosmic Window to Fundamental Physics: Primordial Non-Gaussianity and Beyond.'

The local galaxy bias formalism relies on the energy constraint equation at the formation time to relate the metric perturbation to the matter density field. In the Newtonian approximation, this relationship is linear, which makes it easier to specify the initial galaxy density as a function of local physical operators. In general relativity, however, the relationship is intrinsically nonlinear and there is a modulation of the short-wavelength mode by the long-wavelength mode. I will describe in detail why a local coordinate system is needed to specify the galaxy density as a function of local physical operators. I will also describe how to obtain a suitable local coordinate system and how to use the local coordinate to remove the spurious nonlinear coupling between the long and short-wavelength modes both in the presence and absence of the primordial non-Gaussianity.
Period19 Sept 202223 Sept 2022
Held atUniversidad Autónoma de Madrid, Spain
Degree of RecognitionInternational