Výsledky vyhledávání

Conformal invariance in the nonperturbative renormalization group: a rationale for choosing the regulator

Autor: Nicolás Wschebor, Matthieu Tissier, Ivan Balog, Gonzalo De Polsi

Publikováno v: Physical Review E : Statistical, Nonlinear, and Soft Matter Physics
Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2020, 101 (6), pp.062146. ⟨10.1103/PhysRevE.101.062146⟩

Field-theoretical calculations performed in an approximation scheme often present a spurious dependence of physical quantities on some unphysical parameters associated with the details of the calculation setup (such as, the renormalization scheme or,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09ff3924244b701afef0d9a358c88d2a

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Precision calculation of critical exponents in the $O(N)$ universality classes with the nonperturbative renormalization group

Autor: Gonzalo De Polsi, Matthieu Tissier, Nicolás Wschebor, Ivan Balog

We compute the critical exponents $\nu$, $\eta$ and $\omega$ of $O(N)$ models for various values of $N$ by implementing the derivative expansion of the nonperturbative renormalization group up to next-to-next-to-leading order [usually denoted $\mathc

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https://hal.archives-ouvertes.fr/hal-02475288

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Dimensional reduction breakdown and correction to scaling in the random-field Ising model

Autor: Matthieu Tissier, Gilles Tarjus, Ivan Balog

Publikováno v: Phys.Rev.E
Phys.Rev.E, 2020, 102, pp.062154. ⟨10.1103/PhysRevE.102.062154⟩

We provide a theoretical analysis by means of the nonperturbative functional renormalization group (NP-FRG) of the corrections to scaling in the critical behavior of the random-field Ising model (RFIM) near the dimension ${d}_{\mathrm{DR}}\ensuremath

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https://hal.archives-ouvertes.fr/hal-02946245

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Benchmarking the nonperturbative functional renormalization group approach on the random elastic manifold model in and out of equilibrium

Autor: Gilles Tarjus, Ivan Balog, Matthieu Tissier

Publikováno v: Journal of Statistical Mechanics: Theory and Experiment
Journal of Statistical Mechanics: Theory and Experiment, IOP Publishing, 2019, 2019 (10), pp.103301. ⟨10.1088/1742-5468/ab3da5⟩

Criticality in the class of disordered systems comprising the random-field Ising model (RFIM) and elastic manifolds in a random environment is controlled by zero-temperature fixed points that must be treated through a functional renormalization group

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https://hal.archives-ouvertes.fr/hal-02403866

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On the effective action in presence of local non-linear constraints

Autor: Adam Rançon, Ivan Balog

Publikováno v: J.Stat.Mech.
J.Stat.Mech., 2019, 1903 (3), pp.033215. ⟨10.1088/1742-5468/ab0c12⟩

The conditions for the existence of the effective action in statistical field theory, the Legendre transform of the cumulant generating function, in presence of non-linear local constraints are discussed. This problem is of importance for non-perturb

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b94bb5c1a7cb7d4a68e0b9f18a6a58f9
https://hal.archives-ouvertes.fr/hal-01965371

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Convergence of Nonperturbative Approximations to the Renormalization Group

Autor: Hugues Chaté, Bertrand Delamotte, Maroje Marohnić, Ivan Balog, Nicolás Wschebor

Publikováno v: Phys.Rev.Lett.
Phys.Rev.Lett., 2019, 123 (24), pp.240604. ⟨10.1103/PhysRevLett.123.240604⟩

We provide analytical arguments showing that the non-perturbative approximation scheme to Wilson's renormalisation group known as the derivative expansion has a finite radius of convergence. We also provide guidelines for choosing the regulator funct

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https://hal.archives-ouvertes.fr/hal-02188862

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Criticality of the random field Ising model in and out of equilibrium: A nonperturbative functional renormalization group description

Autor: Gilles Tarjus, Matthieu Tissier, Ivan Balog

Publikováno v: Phys.Rev.B
Phys.Rev.B, 2018, 97 (9), pp.094204. ⟨10.1103/PhysRevB.97.094204⟩
Phys.Rev.B, 2018, 97 (9), pp.094204. 〈10.1103/PhysRevB.97.094204〉

We show that, contrary to previous suggestions based on computer simulations or erroneous theoretical treatments, the critical points of the random-field Ising model out of equilibrium, when quasi-statically changing the applied source at zero temper

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https://hal.archives-ouvertes.fr/hal-01758064

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Disorder-driven quantum transition in relativistic semimetals: functional renormalization via the porous medium equation

Autor: Andrei A. Fedorenko, Ivan Balog, David Carpentier

Publikováno v: Phys.Rev.Lett.
Phys.Rev.Lett., 2018, 121 (16), pp.166402. ⟨10.1103/PhysRevLett.121.166402⟩

In the presence of randomness, a relativistic semimetal undergoes a quantum transition towards a diffusive phase. A standard approach relates this transition to the $U(N)$ Gross-Neveu model in the limit of $N \to 0$. We show that the corresponding fi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ed141c2fdae5d1cc6072fd5d04971a7
https://hal.archives-ouvertes.fr/hal-01903131

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Dynamical conductivity and its fluctuations along the crossover to many-body localization

Autor: Peter Prelovšek, Osor-Slaven Barišić, Jure Kokalj, Ivan Balog

We present a numerical study of the many-body localization (MBL) phenomenon in the high-temperature limit within an anisotropic Heisenberg model with random local fields. Taking the dynamical spin conductivity $\sigma(\omega)$ as the test quantity, w

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http://arxiv.org/abs/1603.01526

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The second change of system in Hungary

Autor: Ivan Balog

Publikováno v: Zbornik Matice srpske za drustvene nauke. :53-60

According to J?nos Kornai, the leading Hungarian economist, the change of regime in the economy took place in Hungary only a decade after the fall of the communist political system. Now, the change of regime, i.e. privatisation, seems to be financial

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https://doi.org/10.2298/zmsdn0927053b

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