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<< Week of April 23 >>

Monday, April 21, 2014

Sloppy Models, Differential Geometry, And How Science Works

Colloquium | April 21 | 4:15-5:30 p.m. | LeConte Hall, Room #1


Jamers Sethna, Professor of Physics, Cornell University

Department of Physics


Models of systems biology, climate change, ecosystems, and macroeconomics have parameters that are hard or impossible to measure directly. If we fit these unknown parameters, fiddling with them until they agree with past experiments, how much can we trust their predictions? We have found that predictions can be made despite huge uncertainties in the parameters -- many parameter combinations are...   More >

Tuesday, April 22, 2014

The Effective Field Theory of Large Scale Structures

Seminar: Cosmology Seminars | April 22 | 1:10 p.m. | B1 Hearst Field Annex


Leonardo Senatore, Stanford

Department of Astronomy


After discussing briefly some implications for Inflation after BICEP2, I will focus on Large Scale Structures surveys, as they promise to be the next leading probe of cosmological information. It is therefore crucial to reliably predict their observables. The Effective Field Theory of Large Scale Structures (EFTofLSS) provides a manifestly convergent perturbation theory for the weakly non-linear...   More >

Thursday, April 24, 2014

Rapid formation pathways for supermassive black holes via direct collapse

Colloquium: Astronomy Colloquia | April 24 | 4:10 p.m. | 1 LeConte Hall


Lucio Mayer, ETH Zurich

Department of Astronomy


The emergence of bright Quasars as early as z >~ 7 strongly suggests the existence of a rapid pathway to form supermassive black holes. Conventional models based on the growth of light BH seeds from primordial Population III stars have difficulties in explaining such a rapid assembly. As a result, models in which massive BH seeds form by direct gas collapse in protogalaxies have received...   More >