For more information about this meeting, contact Robert Vaughan, Mihran Papikian, Ae Ja Yee.

Title: | The Strong CM Lifting Problem |

Seminar: | Algebra and Number Theory Seminar |

Speaker: | Taisong Jing, University of Pennsylvania |

Abstract: |

It is known that an abelian variety over a finite field may not admit a
lifting to an abelian variety with complex multiplication in characteristic 0. The question of strong CM lifting (sCML) asks whether we can kill the obstructions to a CM lifting by requiring the whole ring of integers in the CM field act on the abelian variety. I will give counterexamples to question (sCML), and prove the answer to question (sCML) is affirmative under the following assumptions on the CM field L: for every place v above p in the maximal totally real subfield L_0 , either v is inert in L, or v is split in L with absolute ramification index e(v) < p − 1 |

### Room Reservation Information

Room Number: | MB106 |

Date: | 01 / 30 / 2014 |

Time: | 11:15am - 12:05pm |