Edward Witten has been visiting CERN this past academic year, and it seems that besides continuing to work on things related to geometric Langlands (see his recent talk at Atiyah80), he also has been returning to his roots as a phenomenologist, and taking a wide interest in a range of phenomenological questions being discussed at CERN.
Next week CERN will be hosting a workshop on New Opportunities in the Physics Landscape at CERN, to discuss experiments at CERN over the next 5-10 years that are NOT directly related to the LHC. Witten will open the workshop with a talk on Perspectives in the Physics Landscape away from the Energy Frontier, and his slides are already available. He comments on a variety of topics, including CMB measurements relevant to inflation, neutrino masses and mixings, proton decay, CP violation and axions, and dark matter candidates. All in all, it’s a quite comprehensive survey of how possible non-LHC results might address beyond Standard Model physics questions, mostly from the point of view of the now conventional speculative framework of Supersymmetry/GUTs/String theory.