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Informal Pizza SeminarA small cosmological constant from six-dimensional supergravity braneworlds?Yashar AghababaieMcGillIn this talk I will describe work we have done in constructing the 4D compactifications of 6D supergravities. It turns out that every solution to the equations of motion of these supergravities has flat four-dimensional space regardless of the brane tensions. This is interesting because in a large extra dimensions scenario these models could provide a cosmological constant of the order of milli-eV4/. Whether this is a solution to the cosmlogical constant problem or not depends on fine-tunings. I will go through the fine-tunings in these models, and I will argue that certain kinds of fine-tuning can be completely removed by considering general solutions to the equations of motion.
Tuesday, October 28th 2003, 13:00
Ernest Rutherford Physics Building, room 326 |