Montag, 08. Oktober 2018, 15:00
Invitation to a talk: Gemma De las Cuevas, Monday, October 8, 2018, 3 pm at the IQOQI seminar room
The positivity problem in quantum many-body systems is the difficulty of representing the positivity of the state with a tensor network. Namely, not enforcing the positivity on the local tensors leads to theoretical and numerical challenges, but enforcing it generally comes at a very high price. In this talk I will explain this problem, mention several results, and mention its connections to other mathematical problems. I will also explain some ideas and perspectives to shed new light on it.