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Following light across the Universe (to test gravity and do other stuff)

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If you have a question about this talk, please contact Tommaso Giannantonio .

Some of the strongest constraints on modified gravity theories by cosmology come from their effects on the propagation of light, examples of which include weak gravitational lensing, the integrated Sachs-Wolfe effect and so on. I will show some recent results of constraining gravity using these observables, and use those to motivate the necessity of a code that can do ray tracing on the fly of numerical simulations. Then I will describe a recent attempt to develop such a code, its algorithms and implementation, and some of its tests. Potential applications of the code, both in and out of the standard paradigm, will be mentioned briefly.

This talk is part of the Cosmology Lunch series.

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Cockroft Lecture Theatre and Zoom Winstanley Theatre, Blue Boar Court, Trinity College LT0 Cambridge University Engineering Department

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