2 papers
hep-th2024
On (dis)agreement between different methods of calculation of the imaginary part of the effective action in expanding space-times
E. T. Akhmedov, I. A. Belkovich, D. V. Diakonov +1
We consider two approaches to calculate imaginary parts of effective actions in expanding space-times. While the first approach uses Bogolyubov coefficients, the second one uses th…
hep-th2024
On two approaches to quantization in strong background fields
E. T. Akhmedov, K. A. Kazarnovskii
There are two ways to quantize free (gaussian) theory in strong background fields. In one of them, which we refer to as the Heisenberg approach, the mode functions are defined once…