"New Cosmological View of Dark Matter, which Strangely and Slowly Decays" by Sir Roger Penrose (Oxford)

Monday, January 22, 2018 - 5:00pm to 6:00pm
Bhaumik Lectures

Sir Roger Penrose will give a talk on his latest research and provide an insight into the thinking of a modern day theoretical physicist. Is the Universe destined to collapse, ending in a big crunch or to expand indefinitely until it homogenizes in a heat death? Roger will explain a third alternative, the cosmological conformal cyclic cosmology (CCC) scheme – where the Universe evolves through eons, each ending in the decay of mass and beginning again with new Big Bang.  The equations governing the crossover from each aeon to the next demand the creation of a dominant new scalar material, postulated to be dark matter. In order that this material does not build up from aeon to aeon, it is taken to decay away completely over the history of each aeon. The dark matter particles (erebons) may be expected to behave almost as classical particles, though with bosonic properties; they would probably be of about a Planck mass, and interacting only gravitationally. Their decay would produce gravitational signals, and be responsible for the approximately scale invariant temperature fluctuations in the CMB of the succeeding aeon. In our own aeon, erebon decay might well show up in signals discernable by gravitational wave detectors. The talk will blend Roger’s accessible style with an unapologetic detailed look at the physical principles. It should be of interest to practicing physicists and lay people who enjoy taking a more detailed look at physics.

CNSI Auditorium