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Testing Gravity at Cosmological Scales

Ignacy Sawicki
University of Geneva

Abstract
It is gravity that drives the evolution of the universe. Over the next decade, we will be mapping out essentially the whole visible universe, which will give us an unprecedented opportunity to verify our understanding of gravity at these largest of scales.
In order to achieve this, we have to understand how to remain sufficiently model independent so as not to introduce confirmation bias and yet sufficiently restrained so that the data can actually say something conclusive. I will discuss model-independent observables and methods of parameterising physical properties of gravity that capture the possible deviations in a minimal manner. I will also argue that Planck data imply that we should be deploying these methods to look for scale-dependent effects in structure formation rather than time-dependent effects on the expansion history.

2015 June 23, 13:00

IA/U.Lisboa
Faculdade de CiÍncias da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
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