# Algebra and Algebraic Geometry Seminar Spring 2021: Difference between revisions

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The results are from joint works with Alex Lubotzky and Chen Meiri. | The results are from joint works with Alex Lubotzky and Chen Meiri. | ||

===Marian Aprodu=== | ===February 12: Marian Aprodu=== | ||

'''TBA''' | '''TBA''' | ||

===February 19: Dhruv Ranganathan=== | |||

Title: Logarithmic Donaldson-Thomas theory | |||

Abstract: I will give an introduction to a circle ideas surrounding the enumerative geometry of pairs, and in particular, intersection theory on a new models of the Hilbert schemes of curves on threefolds. These give rise to “logarithmic” DT and PT invariants. I will explain the conjectural relationship between this geometry and Gromov-Witten theory, and give some sense of the role of tropical geometry in the story. The talk is based on joint work, some of it in progress, with Davesh Maulik. | |||

===Eyal Subag=== | ===Eyal Subag=== | ||

'''TBA''' | '''TBA''' |

## Revision as of 23:27, 29 January 2021

The Virtual Seminar will take place on Fridays at 2:30 pm via Zoom. We will also link to relevant or interesting Zoom talks outside of the seminar.

## Algebra and Algebraic Geometry Mailing List

- Please join the AGS mailing list by sending an email to ags+join@g-groups.wisc.edu to hear about upcoming seminars, lunches, and other algebraic geometry events in the department (it is possible you must be on a math department computer to use this link).

## COVID-19 Update

As a result of Covid-19, the seminar for this semester will be held virtually. The default Zoom link for the seminar is https://uwmadison.zoom.us/j/9502605167 (sometimes we will have to use a different meeting link, if Michael K cannot host that day).

## Spring 2021 Schedule

date | speaker | title | link to talk |
---|---|---|---|

January 29 | Nir Avni (Northwestern) | First order rigidity for higher rank lattices | Zoom link |

February 12 | Marian Aprodu (Bucharest) | TBA | Zoom link |

February 19 | Dhruv Ranganathan (Cambridge) | Logarithmic Donaldson-Thomas theory | Zoom link |

February 26 | Philip Engel (UGA) | TBA | Zoom link |

March 12 | Michael Groechenig (University of Toronto) | TBA | Zoom link |

April 16 | Eyal Subag (Bar Ilan - Israel) | TBA | Zoom link |

April 23 | Gurbir Dhillon (Yale) | TBA | Zoom link |

## Abstracts

### January 29: Nir Avni

Title: First order rigidity for higher rank lattices.

Abstract: I'll describe a new rigidity phenomenon for lattices in higher rank simple algebraic groups. Specifically, I'll explain why the first order theories of such groups do not have (finitely generated) deformations and why they are determined (in the class of finitely generated groups) by a single first order axiom.

The results are from joint works with Alex Lubotzky and Chen Meiri.

### February 12: Marian Aprodu

**TBA**

### February 19: Dhruv Ranganathan

Title: Logarithmic Donaldson-Thomas theory

Abstract: I will give an introduction to a circle ideas surrounding the enumerative geometry of pairs, and in particular, intersection theory on a new models of the Hilbert schemes of curves on threefolds. These give rise to “logarithmic” DT and PT invariants. I will explain the conjectural relationship between this geometry and Gromov-Witten theory, and give some sense of the role of tropical geometry in the story. The talk is based on joint work, some of it in progress, with Davesh Maulik.

### Eyal Subag

**TBA**

TBA

### Gurbir Dhillon

**TBA**

TBA