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Causality Constraints in Quantum Field Theory
October 3, 20163:00 pm – 4:00 pm (CDT)

Causality Constraints in Quantum Field Theory


Sandipan Kundu (Cornell University)



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

Causality places nontrivial constraints on QFT in Lorentzian signature, for example fixing the signs of certain terms in the low energy Lagrangian. In conformal field theory, I will show how causality is encoded in crossing symmetry and reflection positivity of Euclidean correlators, and derive constraints on the interactions of low-lying operators directly from the conformal bootstrap. Then, I will explain the connection between these causality constraints and the averaged null energy condition. Finally, I will use causality to show that the averaged null energy is positive in interacting quantum field theory in flat spacetime.

Video Recording

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