Teisip\u00e4eval, 10. novembril 2026 kell 16:15 T\u00dc Physicumi auditooriumis A102, j\u00e4lgitav ka BigBlueButton online keskkonnas<\/p>\n\n\n\n
Sebastian Schuster <\/strong>(T\u00dcFI teoreetilise f\u00fc\u00fcsika teadur)<\/p>\n\n\n\n General relativity and cosmology have had a generous flux of ideas to and from science-fiction. The metric reverse-engineering that is at the core of this, is frequently called into question on diverse grounds\u2014some better, some less so. Warp drives in particular have seen a recent resurgence with substantial controversy. In this talk, I will explain why reverse-engineering is a fine, time-honoured tradition beyond general relativity; why point-wise energy conditions are middling, at best; and why the the fate of such speculative metrics needs to be decided by the (so-far) equally speculative field of quantum gravity or just modified theories of gravity. After a summary of recent work on warp drives and their extensions, I will give an example of what sort of problem quantum gravity would have to solve in such contexts: Time travel through the lens of relational quantum dynamics. I will wrap up with some ideas on how to extent these first toy models to unwieldy physics besides time travel.<\/p>\n\n\n\n