Perimeter Graduate Conference 2025

1/2-BPS line defects in 4d N = 2 SQFTs via Cohomological Hall algebras

Oct 16, 2025, 11:20 AM

20m

PI/3-394 - Skyroom (Perimeter Institute for Theoretical Physics)

Contributed Talk

Speaker

Nikita Grygoryev

Description

After a brief reminder/introduction of relevant facts about 4d N=2 SQFTs (BPS things, twisting, wall-crossing, line defects) I will try to sketch our proposal for the category of 1/2-BPS line defects in terms of certain bimodules over Cohomological Hall algebra of the BPS quiver; maybe even say a few words about why we believe it is a correct thing to do.

External references

• 25100196
• a6cd8ef4-d82b-4bcc-a005-d14d59e5363a