ELFT HÍRADÓ

[Pothoczki Szilvia <pothoczki.szilvia AT wigner.hu>]

Dear Colleagues,

The Scientific Council of the Wigner RCP, Institute for Particle and 
Nuclear Physics invites you to attend the lecture by

                                      Dr. István Rácz

related to his application for the title of 'Research Professor'.

                  Spacetime Singularities and Curvature Blow-ups

The presentation will take place on Monday, March 20, 2023 at 2:00 pm. 
in the conference room of Building 1, 1st floor of the KFKI Campus.

You may also join the event online using the following link:
https://wigner-hu.zoom.us/j/82025007930?pwd=MGEwSjNVY2xoZ0tkb2xJYm03clVUZz09
Meeting ID: 820 2500 7930
Passcode: 260343

Unless someone will need English as the language of the lecture, the 
talk will be given in Hungarian, however, presenting English slides.
This talk is a public event; all those interested are welcome to attend 
or to join on-line.

Best regards,
Szilvia Pothoczki

On behalf of Edit Szilágyi
Chairman of Scientific Council of the Wigner RCP,
Institute for Particle and Nuclear Physics

Abstract
The "singularity theorems" of Penrose, Hawking, and Geroch predict only 
the existence of incomplete inextendible causal geodesics in a wide 
range of physically adequate spacetimes modeling the gravitational 
collapse of stars and the expanding universe. In contrast, on physical 
grounds, singularities are expected to be associated with the blow-up of 
some physical quantities. The aim of this seminar is to give a brief 
overview of the basic concepts related to our current understanding of 
spacetime singularities. Special attention will be given to some aspects 
of the initial value formulation of general relativity, the cosmic 
censor hypotheses proposed by Penrose, and also to results on spacetime 
extensions. These preparations will be used to outline an argument that 
could provide important insights into the generic properties of 
spacetime singularities. In particular, it will be argued that if a 
suitable low regular form of the strong cosmic censor hypothesis holds, 
then a parallelly propagated blow-up of either the tidal force or the 
frame-drag part of the curvature must occur in "generic" timelike 
geodesically incomplete maximal Cauchy developments.

References:
* Rácz, I. (1993): Spacetime extensions I., Journal of Mathematical 
Physics 34, 2448-2464
* Rácz, I. (2010): Spacetime extensions II, Classical and Quantum 
Gravity, 27, 155007,
In 2011 the Editorial Board of Classical and Quantum Gravity selected 
this paper as one of the Highlights of 2010.
* Rácz, I. (2023): Spacetime singularities and curvature blow-ups, 
General  Relativity and Gravitation 55, Article number: 3