Revealing Quantum Gravity with the Event Horizon Telescope
There is currently great interest in experimental tests of quantum gravity theories. However the EHT may provide the first opportunity for testing quantum gravity. In particular the Chapline-Laughlin -Mazur vacuum for quantum gravity leads to a spectacular prediction: the event horizon for any rotatating compact object has a toroidal topology. if this is the case then AGN jets may originate from the throat of this toroid.
Speaker: George Chapline, Lawrence Livermore National Labs
Predicting small-scale galaxy clustering and lensing with simulations
The statistical precision of galaxy clustering and lensing measurements is greatest at small (~Mpc) scales, but the complexities of structure formation and galaxy bias make this regime the most difficult for which to provide accurate predictions for use in cosmological analyses. I have used N-body simulations to predict structure formation, combined with a halo occupation distribution model to populate halos with galaxies, which provides accurate predictions in this regime for both galaxy clustering and galaxy-galaxy lensing across a wide range of galaxy and cosmological parameter space by using Gaussian process interpolation. In order to approach data, I have examined selection effects in the CMASS galaxy sample and suggest possible modifications to the standard halo model in order to incorporate such effects. I conclude with future directions and prospects for cosmological inference on small scales with DES and DESI.
Speaker: Ben Wibking, Ohio State Univ.
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