Скачать с ютуб George Ellis, "The Evolving Block Universe: A More Realistic View of Spacetime Geometry" в хорошем качестве

George Ellis, "The Evolving Block Universe: A More Realistic View of Spacetime Geometry"

Usual spacetimes have no representation of the present time, or the difference between past, present, and future; thus they do not represent the flow of time as experienced in macrophysics, chemistry, biology, and the mind. Prof. Ellis proposes here a more realistic spacetime model: an evolving block universe, where the future boundary of spacetime represents the present time, and changes as time evolves along timelike worldliness. This necessarily involves existence of preferred surfaces of change that form the future boundary of spacetime; Prof. Ellis argues these do indeed exist in any realistic spacetime model (the symmetry of the theory is broken by the geometry of the solution). Prof. Ellis shows how the evolution of these models may be expressed in usual ADM terms as long as the surfaces remain spacelike, and argue that this viewpoint automatically provides chronology protection. Issues remain as to what happens if these surfaces become timelike: Prof. Ellis argues that this can only happen in extreme circumstances associated with back hole formation. From the "Do We Need a Physics of 'Passage'?" workshop, 10 — 14 December, 2012 Vineyard Hotel & Spa, Cape Town, South Africa.