Wilsonian renormalization group and thermal field theory in the Schwinger-Keldysh closed-time-path formalism

Frangi, Giorgio (avtor), Grozdanov, Sašo (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: renormalization group, effective field theory, finite temperature field theory, critical phenomena
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: Str. 085034-1-085034-17
• Številčenje: Vol. 111, iss. 8
• PID: 20.500.12556/RUL-168887
• UDK: 539.1
• ISSN pri članku: 2470-0010
• DOI: 10.1103/PhysRevD.111.085034
• COBISS.SI-ID: 234837251
• Datum objave v RUL: 06.05.2025

Gradivo je del revije

• Naslov: Physical review
• Skrajšan naslov: Phys. rev., D
• Založnik: American Physical Society
• ISSN: 2470-0010
• COBISS.SI-ID: 29757223

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: renormalizacijska grupa, teorija polja, efektivna teorija polja, kritični pojavi