3 papers
gr-qc2025
From negative to positive cosmological constant through decreasing temperature of the Universe: connection with string theory and spacetime foliation results
E. N. Nyergesy, I. G. Márián, A. Trombettoni +1
String theories naturally predict a negative, while observations on the exponential expansion of the present Universe require a positive value for the cosmological constant. Soluti…
hep-th2024
Thermal and Quantum Phase Transitions of the Model
István Gábor Márián, Andrea Trombettoni, István Nándori
In this paper we discuss and revisit the finite temperature extension of the renormalization group (RG) treatment of field theories, focusing as a case study on the mod…
hep-th2024
Time Evolution and Thermal Renormalization Group Flow in Cosmology
Istvan Gabor Marian, Andrea Trombettoni, Istvan Nandori
Time-evolution of the Universe as described by the Friedmann equation can be coupled to equations of motion of matter fields. Quantum effects may be incorporated to improve these c…