Speaker: Gerardo García Moreno
Place: The Cloud
Date: Tues May 21st
Time: 9am Central.
Zoom link
https://lsu.zoom.us/j/97841382114?pwd=NHNmV25oaWJzWkdpekdsaU5mYys0UT09
Title: Playing with causality in analogue gravity
Abstract:
General Relativity is the most succesful theory we have for describing
gravitational phenomena. Its range of applicability is vast: from solar
system scales to cosmological scales. It is well-known that in principle
GR allows the existence of time machines: devices that are able to
generate Closed-Timelike-Curves (CTCs). Although these kind of objects
are allowed in GR, most researchers believe that they cannot occur on
macroscopic scales. However, it is widely believed that a full quantum
theory of gravity would be required to fully understand the mechanisms
beneath this "Chronology Protection Conjecture". Furthermore, it is
logically possible to consider superpositions of spacetimes in theories
of quantum gravity. This means, superpositions of two semiclassical
states corresponding to approximately smooth spacetimes. I will discuss
the state of the Chronology Protection Conjecture and the possibility of
superposing spacetimes within the context of analogue gravity.
No comments:
Post a Comment