24 citations · 99 across the 13 of their papers we have counts for
13 papers
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…
Perturbative versus Non-Perturbative Renormalization
S. Hariharakrishnan, U. D. Jentschura, I. G. Marian +2
Approximated functional renormalization group (FRG) equations lead to regulator-dependent -functions, in analogy to the scheme-dependence of the perturbative renormalization gro…
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…
Renormalisation of non-differentiable potentials
J. Alexandre, N. Defenu, G. Grigolia +5
Non-differentiable potentials, such as the V-shaped (linear) potential, appear in various areas of physics. For example, the effective action for branons in the framework of the br…
Polarised superlocalization in magnetic nanoparticle hyperthermia
Zs. Iszaly, I. Gresits, I. G. Marian +5
Magnetic hyperthermia is an adjuvant therapy for cancer where injected magnetic nanoparticles are used to transfer energy from the time-dependent applied magnetic field into the su…
Theory of superlocalized magnetic nanoparticle hyperthermia: rotating versus oscillating fields
Zs. Iszaly, I. G. Marian, I. A. Szabo +2
The main idea of magnetic hyperthermia is to increase locally the temperature of the human body by means of injected superparamagnetic nanoparticles. They absorb energy from a time…
Vacuum Energy and Renormalization of the Field-Independent Term
I. G. Marian, U. D. Jentschura, N. Defenu +2
Due to its construction, the nonperturbative renormalization group (RG) evolution of the constant, field-independent term (which is constant with respect to field variations but de…
Renormalization-Group Running Induced Cosmic Inflation
I. G. Marian, N. Defenu, U. D. Jentschura +2
As a contribution to a viable candidate for a standard model of cosmology, we here show that pre-inflationary quantum fluctuations can provide a scenario for the long-sought initia…
Efficiency of magnetic hyperthermia in the presence of rotating and static fields
Zs. Iszaly, K. Lovasz, I. Nagy +7
Single-domain ferromagnetic nanoparticle systems can be used to transfer energy from a time-dependent magnetic field into their environment. This local heat generation, i.e., magne…
Pseudo-Periodic Natural Higgs Inflation
I. G. Marian, N. Defenu, U. D. Jentschura +2
Inflationary cosmology represents a well-studied framework to describe the expansion of space in the early universe, as it explains the origin of the large-scale structure of the c…
Truncation Effects in the Functional Renormalization Group Study of Spontaneous Symmetry Breaking
N. Defenu, P. Mati, I. G. Marian +2
We study the occurrence of spontaneous symmetry breaking (SSB) for O(N) models using functional renormalization group techniques. We show that even the local potential approximatio…
The Numerically Optimized Regulator and the Functional Renormalization Group
I. G. Marian, U. D. Jentschura, I. Nandori
We aim to optimize the functional form of the compactly supported smooth (CSS) regulator within the functional renormalization group (RG), in the framework of bosonized two-dimensi…
Spontaneous symmetry breaking and optimization of functional renormalization group
I. Nandori, I. G. Marian, V. Bacso
The requirement for the absence of spontaneous symmetry breaking in the d=1 dimension has been used to optimize the regulator dependence of functional renormalization group equatio…