20.500.12556/RUL-168887 Wilsonian renormalization group and thermal field theory in the Schwinger-Keldysh closed-time-path formalism We study perturbative Wilsonian renormalization group (RG) for the scalar $\phi^4$ theory at finite temperature to one loop order in the Schwinger-Keldysh closed-time-path (CTP) formalism. By explicitly integrating out the UV modes, we show how effective interactions coupling the two branches of the CTP contour arise. This provides a microscopic derivation of the type of effective CTP actions used in the literature. While the full effective theory has no critical points, we instead proceed to study critical properties of the RG flow in a reduced space of complex couplings that characterize certain time-ordered correlators and show the existence of two novel fixed points in d=4 spacetime dimensions. We relate one to the Wilson-Fisher fixed point known to exist only in 4-$\epsilon$ dimensions, and the other to the standard Gaussian fixed point. renormalization group effective field theory finite temperature field theory critical phenomena renormalizacijska grupa teorija polja efektivna teorija polja kritični pojavi true false true Angleški jezik Slovenski jezik Članek v reviji 2025-05-06 07:53:46 2025-05-06 07:53:49 2025-05-07 04:05:39 0000-00-00 00:00:00 2025 0 0 Str. 085034-1-085034-17 iss. 8 Vol. 111 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.1 2470-0010 10.1103/PhysRevD.111.085034 234837251 PhysRevD.111.085034.pdf PhysRevD.111.085034.pdf 1 928B05E4573A613FA7A97ADE825BE72A 23098057a4b3914983dfb2ccef0f606899b2d6eb4a1cc8eec0ed06f157ce2336 02b57d20-2a3e-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=209965 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.085034 0 0b8d8760-2a3e-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=209966 Fakulteta za matematiko in fiziko 0 0 0