Résumé / Abstract Seminaire_IAP
« IT from BIT, from BITs in IT: Probing the Cosmic Information in Early and Late Universe Physics »

Richard Bond
Canadian Inst. Theor. Astroph. (CITA), Univ. Toronto (Toronto, Canada)

The Universe is fundamentally quantum and statistical, a many-paths/many-worlds random-field story that pervades all discussions in cosmic theory. This talk uses "Cosmic Information Theory and Analysis" (CITA) as a unifying theme to explore our ideas of how the Universe morphed from a smooth Hubble-patch within a vast landscape into the intricate evolving complexity of the cosmic web we observe. I will discuss how we try to probe the two great entropy (Shannon information) generation epochs. The second epoch, from which most of the entropy in electrons and baryons arises, is from crashing density waves as nonlinearities in the cosmic web grow hierarchically, through conventional shocks (in-space). The impact on cluster observables of non-thermal cluster entropies, in dark matter, and in gas pressure and density clumping and in internal bulk flows, will be used as an example. The first epoch, from which almost all of the entropy of the universe is thought to arise, is from post-inflation preheating through the "shock-in-times" of highly non-equilibrium interacting fields. I will also discuss the information content of cosmic parameter measurements, with applications to acceleration trajectories of the early-inflaton and of the late-inflation Dark Energy - and our entropic fate.
vendredi 28 septembre 2012 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
Page web du séminaire / Seminar's webpage