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When the QCD axion is absent in full theory, the strong $CP$ problem has to be explained by an additional mechanism, e.g., the left-right symmetry. Even though tree-level QCD $\bar\theta$ parameter is restricted by the mechanism, radiative…

High Energy Physics - Phenomenology · Physics 2025-09-22 Junji Hisano , Teppei Kitahara , Naohiro Osamura , Atsuyuki Yamada

Constructive interference among coherent waves traveling time-reversed paths in a random medium gives rise to the enhancement of light scattering observed in directions close to backscattering. This phenomenon is known as enhanced…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Hariharan Subramanian , Prabhakar Pradhan , Young L. Kim , Yang Liu , Xu Li , Vadim Backman

Two-particle correlations at small relative momenta give insight into the size of the emitting source. Of particular interest is the test of hydrodynamic models which predict a universal, apparent decrease of the extent of the system with…

Nuclear Experiment · Physics 2019-08-13 Hans Beck

Purpose: To investigate the validity of two Monte Carlo simulation absolute dosimetry approaches in the case of a small field dedicated `D'-shaped collimator used for the retinoblastoma treatment with external photon beam radiotherapy.…

Medical Physics · Physics 2018-09-25 P. A. Mayorga , L. Brualla , A. Flühs , W. Sauerwein , A. M. Lallena

Modelling the inelastic scattering of electrons in water is fundamental, given their crucial role in biological damage. In Monte Carlo track-structure codes used to assess biological damage, the energy loss function, from which cross…

[abridged] We constrain a phenomenological dark radiation (DR) framework consisting of free-streaming and fluid-like components, providing a model-independent extension of the standard radiation sector. Using Planck CMB data, DESI DR2 BAO…

Cosmology and Nongalactic Astrophysics · Physics 2026-05-26 Matteo Mescia , Héctor Gil-Marín

We have investigated the basic statistics of the cosmological dispersion measure (DM) -- such as its mean, variance, probability distribution, angular power spectrum and correlation function -- using the state-of-the-art hydrodynamic…

Cosmology and Nongalactic Astrophysics · Physics 2021-02-03 Ryuichi Takahashi , Kunihito Ioka , Asuka Mori , Koki Funahashi

In recent years, convolutional neural networks (CNNs) have experienced an increasing interest in their ability to perform a fast approximation of effective hydrodynamic parameters in porous media research and applications. This paper…

Machine Learning · Computer Science 2022-04-14 Stephan Gärttner , Faruk O. Alpak , Andreas Meier , Nadja Ray , Florian Frank

Learning-based radio map estimation (RME) plays a critical role in UAV-assisted wireless sensing, enabling tasks such as coverage prediction and network optimization. Most current methods assume an independently and identically distributed…

Computer Vision and Pattern Recognition · Computer Science 2026-05-28 Feng Qiu , Zheng Fang , Shuhang Zhang , Kangjun Liu , Longkun Zou , Jing Liu , Ke Chen

Background: A relative biological effectiveness (RBE) of 1.1 is used for proton therapy though clinical evidence of varying RBE was raised. Clinical studies on RBE variability have been conducted for decades for carbon radiation, which…

Medical Physics · Physics 2022-06-15 Liheng Tian , Christian Hahn , Armin Luehr

We analyze the frequency dependence of the dispersion measure (DM), the column density of free electrons to a pulsar, caused by multipath scattering from small scale electron-density fluctuations. The DM is slightly different along each…

Instrumentation and Methods for Astrophysics · Physics 2016-01-21 J. M. Cordes , R. M. Shannon , D. R. Stinebring

Volume limitations and low yield thresholds of biological fluids have led to widespread use of passive microparticle rheology. The mean-squared-displacement (MSD) statistics of bead position time series (bead paths) are either applied…

We investigate the medium modifications of momentum splitting fraction and groomed jet radius with both dynamical grooming and soft drop algorithms in heavy-ion collisions. In the calculation, the partonic spectrum of initial hard…

Nuclear Theory · Physics 2023-03-22 Lei Wang , Jin-Wen Kang , Qing Zhang , Shuwan Shen , Wei Dai , Ben-Wei Zhang , Enke Wang

We consider the linear regression problem of estimating a $p$-dimensional vector $\beta$ from $n$ observations $Y = X \beta + W$, where $\beta_j \stackrel{\text{i.i.d.}}{\sim} \pi$ for a real-valued distribution $\pi$ with zero mean and…

Statistics Theory · Mathematics 2020-01-01 Galen Reeves , Jiaming Xu , Ilias Zadik

A model for beam customization with collimators and a range-compensating filter based on the phase-space theory for beam transport is presented for dose distribution calculation in treatment planning of radiotherapy with protons and heavier…

Medical Physics · Physics 2008-05-27 Nobuyuki Kanematsu , Shunsuke Yonai , Azusa Ishizaki , Masami Torikoshi

$\mathrm{^{117m}Sn}$ and $\mathrm{^{119}Sb}$, the latter of which is produced via a $\mathrm{^{119m}Te}$ generator, are promising radionuclides for the targeted treatment of both osteoarthritis and small mass tumors via Auger therapy.…

Diffusive random walks feature the surprising property that the average length of all possible random trajectories that enter and exit a finite domain is determined solely by the domain boundary. Changes in the diffusion constant or the…

Soft Condensed Matter · Physics 2021-04-30 Matthieu Davy , Matthias Kühmayer , Sylvain Gigan , Stefan Rotter

Carbon-ion radiotherapy (CIRT) is generally evaluated with the dose weighted by relative biological effectiveness (RBE), while the radiation quality varying in the body of each patient is ignored for lack of such distribution. In this…

Medical Physics · Physics 2018-05-30 Nobuyuki Kanematsu , Naruhiro Matsufuji , Taku Inaniwa

The interest in the extracellular vesicles (EVs) is rapidly growing as they became reliable biomarkers for many diseases. For this reason, fast and accurate techniques of EVs size characterization are the matter of utmost importance. One…

Biological Physics · Physics 2018-03-26 M. Majka , M. Durak-Kozica , A. Kamińska , A. Opalińska , M. Szczęch , E. Stępień

A model for the motion of ring-shaped DNA in a gel is introduced and studied by numerical simulations and a mean-field approximation. The ring motion is mediated by finger-shaped loops (hernias) that move in an amoeba-like fashion around…

Soft Condensed Matter · Physics 2009-10-30 Uri Alon , David Mukamel