Talks: Juliusz Doboszewski

Juliusz Doboszewski (Bonn) will be visiting the Geneva Symmetry Group (GSG) this week. The GSG is happy to present two talks by him, a more formal talk on Wednesday, and an informal seminar on Thursday (abstracts below):

Wednesday, 18 December 2019, at 18:15 in Room L208 (Landolt):

Juliusz Doboszewski (Bonn): No “no go” for LIGO prediction

Thursday, 19 December 2019, at 16:15 in room B111 (Bastions):

Juliusz Doboszewski (Bonn): General relativity as a classical limit

Anyone who wishes to attend is welcome.


***

Wednesday, 18 December 2019, at 18:15 in Room L208 (Landolt):

Juliusz Doboszewski (Bonn): No “no go” for LIGO prediction

Abstract: It has been claimed that certain results concerning global structure of spacetime imply that prediction is “essentially impossible” in general relativity. But what is the scope and importance of the formal result underlying that claim? I will discuss this issue in the context of prediction tested in gravitational wave astronomy, and show how the experimental setup of the LIGO collaboration avoids the “no go” theorem; this sheds new light on some of the more subtle ways in which physicists use general relativity in making predictions. I will also suggest that a distinction between kinematics and dynamics could be used in explaining the discontent one may experience when faced with this (and other similar) “no go” results.
In terms of technical difficulty, this talk rates 3/5

Thursday, 19 December 2019, at 16:15 in room B111 (Bastions):

Juliusz Doboszewski (Bonn): General relativity as a classical limit

Abstract: A common consensus is that an adequate theory of quantum gravity has to recover general relativity as a classical limit. But what does that mean, exactly? I will point out that this question is not being answered in a consistent manner across various approaches: technical results hailed as a recovery of GR provide a highly heterogeneous spectrum of statements to pick from. Which of these could be seen as sufficient, and to what extent these results could be stratified according to their generality is rarely addressed. As a consequence, recovery of GR in the classical limit is not a well defined criterion for non-empirical theory assessment. However, I will argue that some progress can be made by recourse to careful conceptual analysis, and that various strategies physicists have pursued when trying to recover GR connect to interpretational options concerning the classical theory.

In terms of technical difficulty, this talk rates 3/5
Paper to be read in preparation: John Byron Manchak. Is prediction possible in general relativity?. Foundations of Physics 38 (2008): 317-321.

About wuthrich

I am a philosopher of physics at the University of Geneva.
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