On the Coniveau of Rationally Connected 3-folds
Duration: 1 hour 2 mins
Share this media item:
Embed this media item:
Embed this media item:
About this item
| Description: |
Voisin, C
Tuesday 18th May 2021 - 14:00 to 15:00 |
|---|
| Created: | 2021-05-20 10:46 |
|---|---|
| Collection: | Swinnerton-Dyer Memorial |
| Publisher: | Isaac Newton Institute for Mathematical Sciences |
| Copyright: | Voisin, C |
| Language: | eng (English) |
| Abstract: | It is known that the integral cohomology of positive degree of a rationally connected projective complex manifold has coniveau at least 1, that is, is supported on a proper subvariety. However it is unknown whether is comes from the cohomology of a smooth projective variety of smaller dimension by a Gysin morphism (that is, whether it is of strong coniveau at least 1, following the terminology of Benoist and Ottem). This last property is a necessary condition for stable rationality. We prove that it is satisfied by rationally connected threefolds. |
|---|---|
Available Formats
| Format | Quality | Bitrate | Size | |||
|---|---|---|---|---|---|---|
| MPEG-4 Video | 640x360 | 248.23 kbits/sec | 112.72 MB | View | Download | |
| WebM | 640x360 | 193.12 kbits/sec | 87.70 MB | View | Download | |
| iPod Video | 480x270 | 487.56 kbits/sec | 221.40 MB | View | Download | |
| MP3 | 44100 Hz | 253.59 kbits/sec | 115.16 MB | Listen | Download | |
| Auto * | (Allows browser to choose a format it supports) | |||||