Status  Confirmed 
Seminar Series  P^3 
Subjects  astroph,hepph,hepth 
Date  Tuesday 24 November 2020 
Time  16:00 
Institute  IHP 
Seminar Room  Seminar via zoom https://ijclab.zoom.us/j/94900481972 
Speaker's Last Name  Zaldarriaga 
Speaker's First Name  Matias 
Speaker's Email Address  
Speaker's Institution  IAS Princeton 
Title  Modelling the clustering of matter on large scales: progress and recent results 
Abstract  Measurements of how matter clusters on large scales can help answer some of the remaining mysteries in Cosmology. Even though the large scale dynamics of the matter in our Universe is simple, the theory that describes fluctuations on large scales is modified by the effect of the very nonlinear dynamics on smaller scales. The large scale dynamics is described by the Effective Theory of Large Scale Structure framework. I will describe the framework. I will describe its application to current data, in particular a determination of the Hubble constant (H0 = 68.6±1.1 km s1 Mpc1) which does not use CMB data. A major challenge in this framework is to calibrate the free parameters of the theory that encode the effects of the small scales on the large ones. Constraining these parameters from the large scale clustering data leads to significant degradation in the cosmological constraints. One could imagine constraining these parameters using a combination of small scale simulations and observations. I will discuss the accuracy required of this calibration to improve constraints from future surveys. 
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