Tootfinder

Renormalization group for effective field theories: cutoff schemes and universality
Jose Gaite
https://arxiv.org/abs/2507.17573 https://arxiv.org/pdf/2507.…

Renormalization group for effective field theories: cutoff schemes and universality
In effective field theories, the concept of renormalization of perturbative divergences is replaced by renormalization group concepts such as relevance and universality. Universality is related to cutoff scheme independence in renormalization. Three-dimensional scalar field theory with just the quartic coupling is universal but the less relevant sextic coupling introduces a cutoff scheme dependence, which we quantify by three independent parameters, in the two-loop order of perturbation theory.…

Renormalized quark masses using gradient flow
Matthew Black, Robert V. Harlander, Anna Hasenfratz, Antonio Rago, Oliver Witzel
https://arxiv.org/abs/2506.16327

Renormalized quark masses using gradient flow
We propose a new and simple method for determining the renormalized quark masses from lattice simulations. Renormalized quark masses are an important input to many phenomenological applications, including searching/modeling physics beyond the Standard Model. The non-perturbative renormalization is performed using gradient flow combined with the short-flow-time expansion that is improved by renormalization-group (RG) running to match to the $\overline{\text{MS}}$-scheme. RG running connects the …

Unifying renormalized and bare viscosity in two-dimensional molecular dynamics simulations
Kazuma Yokota, Masato Itami, Shin-ichi Sasa
https://arxiv.org/abs/2506.16002

Unifying renormalized and bare viscosity in two-dimensional molecular dynamics simulations
Fluctuating hydrodynamics provides a framework connecting mesoscopic fluctuations with macroscopic transport behavior. To bridge mesoscopic and macroscopic transport from microscopic dynamics, we introduce a wavenumber-dependent viscosity, defined via the equilibrium correlation of time-averaged Fourier components of the fine-grained shear stress field, as a finite-wavevector extension of the Green--Kubo formula. Two-dimensional molecular dynamics simulations reveal its small-wavenumber diverge…

Two-loop renormalization and running of galaxy bias
Thomas Bakx, Mathias Garny, Henrique Rubira, Zvonimir Vlah
https://arxiv.org/abs/2507.13905 https://

Two-loop renormalization and running of galaxy bias
We systematically extend the framework of galaxy bias renormalization to two-loop order. For the minimal complete basis of 29 deterministic bias operators up to fifth order in the density field and at leading order in gradient expansion we explicitly work out one- and two-loop renormalization. The latter is provided in terms of double-hard limits of bias kernels, which we find to depend on only one function of the ratio of the loop momenta. After including stochasticity in terms of composite op…

One-Loop Correction to the Higgs Mass
Kang-Sin Choi
https://arxiv.org/abs/2506.18667 https://arxiv.org/pdf/2506.18667

One-Loop Correction to the Higgs Mass
We present the complete one-loop corrected Higgs mass within the Standard Model. It is crucial to identify the observable mass as the renormalized one that depends on the external momentum. The correction is finite and dominated by the loops involving W bosons, Z boson and top quark. These contributions exhibit a power-law running with momentum, which may be verifiable at the Large Hadron Collider.

Importance of Non-Adiabatic Effects on Kohn Anomalies in 1D metals
Enrico Marazzi (IMCN Universit\'e catholique de Louvain Belgium), Samuel Ponc\'e (ETSF Universit\'e catholique de Louvain Belgium, WEL Research Institute Belgium), Jean-Christophe Charlier (IMCN Universit\'e catholique de Louvain Belgium), Gian-Marco Rignanese (ETSF Universit\'e catholique de Louvain Belgium, WEL Research Institute Belgium, School of Materials Science and Engineering Northwestern Pol…

Importance of Non-Adiabatic Effects on Kohn Anomalies in 1D metals
Kohn anomalies are kinks or dips in phonon dispersions which are pronounced in low-dimensional materials. We investigate the effects of non-adiabatic phonon self-energy on Kohn anomalies in one-dimensional metals by developing a model that analyzes how the adiabatic phonon frequency, electron effective mass, and electron-phonon coupling strength influence phonon mode renormalization. We introduce an electron-phonon coupling strength threshold for low-temperature system instability, providing ex…

Preserving spreading dynamics and information flow in complex network reduction
Dan Chen, Housheng Su, Yong Wang, Jie Liu
https://arxiv.org/abs/2506.18641 …

Preserving spreading dynamics and information flow in complex network reduction
Effectively preserving both the structural and dynamical properties during the reduction of complex networks remains a significant research topic. Existing network reduction methods based on renormalization group or sampling often face challenges such as high computational complexity and the loss of critical dynamic attributes. This paper proposes an efficient network reduction framework based on subgraph extraction, which accurately preserves epidemic spreading dynamics and information flow th…

Matter Spectral Functions from Quantum Gravity
Varun Kher, Brandon King, Daniel F. Litim, Manuel Reichert
https://arxiv.org/abs/2507.17862 https://arxiv.or…

Matter Spectral Functions from Quantum Gravity
We investigate Lorentzian quantum gravity coupled to a template matter sector with gauge fields, scalars and fermions. In the absence of quantised gravity, the matter sector by itself is renormalisable, but UV-incomplete. Provided quantum gravity offers an asymptotically safe UV-completion, we determine the photon and scalar two-point functions in the presence of gravitational fluctuations, and show that both possess a Källén-Lehmann spectral representation. Our results are achieved using fun…

Determination of $|V_{\rm cb}|$ using Bayesian analysis of the $B \rightarrow D^{*}\ell {\bar \nu}_\ell$ semileptonic decay width with four-loop QCD corrections
Wang Li, Xing-Gang Wu, Hua Zhou, Xu-Chang Zheng
https://arxiv.org/abs/2506.18026

Determination of $|V_{\rm cb}|$ using Bayesian analysis of the $B \rightarrow D^{*}\ell {\bar ν}_\ell$ semileptonic decay width with four-loop QCD corrections
The Cabibbo-Kobayashi-Maskawa matrix element $|V_{\rm cb}|$ is an important Standard Model parameter, whose value can be determined by using the semi-leptonic decay $B\rightarrow D^{*}\ell{\bar ν}_\ell$. The perturbative QCD (pQCD) corrections to the $B \to D^{*}$ transform form factor ${\cal F}(w)$ has been known up to the N$^3$LO level, whose magnitude remains sensitive to the choice of renormalization scale $μ_r$. To improve the precision of ${\cal F}(w)$ and hence $|V_{\rm …

On the Renormalization Group flow of distributions
Astrid Eichhorn, Aaron Held
https://arxiv.org/abs/2506.12548 https://arxiv.org/pdf…

On the Renormalization Group flow of distributions
Renormalization Group flows relate the values of couplings at different scales. Here, we go beyond the Renormalization Group flow of individual trajectories and derive an evolution equation for a distribution on the space of couplings. This shift in perspective can provide new insights, even in theories for which the Renormalization Group flow of individual couplings is well understood. As a first application, we propagate errors under the Renormalization Group flow. Characteristic properties o…