[PHK_seminar] [Cohomology]Wednesday 20 Nov, Anton Galaev

[Petr Somberg]

 This is just the remainder that our seminar is going to start rather soon!

> Cohomology in algebra, geometry, physics and statistics
> Wednesday, 20 November 2024 - 13:30 to 14:30
> Place: ZOOM  meeting
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> Speaker: Anton Galaev, University  of Hradec Kralove
> Title: Conformally homogeneous Lorentzian spaces
> Abstract
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> This is a joint work with Dmitri Alekseevsky. We prove that if a simply
> connected non-conformally flat conformal Lorentzian manifold (M,c) admits
> an essential transitive group of conformal transformations, then there
> exists a metric g∈c such that (M,g) is a complete homogeneous plane wave.
> We also prove that the group of conformal transformations of a
> non-conformally flat simply connected homogeneous plane wave (M,g)
> consists of homotheties, hence it is a 1-dimensional extension of the
> group of isometries.
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> We shall open the ZOOM at 13.15 for coffee and close the room at 15:00
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> Join Zoom Meeting
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> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9
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> MeetingID:99598413922
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> Passcode:Galois
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> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
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> Cohomology in algebra, geometry, physics and statistics mailing list
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