2 papers
hep-th2026
Non-vacuum gravitational effective action
Andrei O. Barvinsky, Farahmand Hasanov, Nikita Kolganov
Curvature expansion for the heat kernel trace and the one-loop effective action is built for the wave operator of the theory in the quasi-thermal setup of a nonvacuum quantum state…
hep-th2024
Unperturbation theory: reconstructing Lagrangians from instanton fluctuations
Farahmand Hasanov, Nikita Kolganov
Instantons present a deep insight into non-perturbative effects both in physics and mathematics. While leading instanton effects can be calculated simply as an exponent of the inst…