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Polyharmonic curves in semi-Riemannian manifolds
Stefano Montaldo, Andrea Ratto, Antonio Sanna
https://arxiv.org/abs/2506.16954 https://

Polyharmonic curves in semi-Riemannian manifolds
Let $(M^m_t,g)$ be a semi-Riemannian manifold of dimension $m$ with a non-degenerate metric of \textit{index} $t$, $m\geq 2$, $1 \leq t \leq m-1$. The main aim of this paper is to investigate the existence of Frenet curves in $(M^m_t,g)$ which are polyharmonic of order $r$, shortly, $r$-harmonic. We shall focus primarily on the cases that the ambient space is a semi-Riemannian space form $N^m_t(c)$ of sectional curvature $c$, a ruled Lorentzian surface or a suitable, possibly warped, product sp…

Polarons with arbitrary nonlinear electron-phonon interaction
Stefano Ragni, Tomislav Mi\v{s}ki\'c, Thomas Hahn, Nikolay Prokof'ev, Osor S. Bari\v{s}i\'c, Naoto Nagaosa, Cesare Franchini, Andrey S. Mishchenko
https://arxiv.org/abs/2506.17914

Polarons with arbitrary nonlinear electron-phonon interaction
We develop an exact computational method based on numerical X-propagators for solving polaron models with arbitrary nonlinear couplings of local vibration modes to the electron density and magnitude of the hopping amplitude. Our approach covers various polaron models, some of which were impossible to treat by any existing approximation-free techniques. Moreover, it remains efficient in the most relevant but computationally challenging regime of phonon frequencies much smaller than the electron …

Implementing and Verifying a Fourier Domain Approach to Fast Stochastic X-ray Polarimetry Timing
Melissa Ewing, Adam Ingram, John Rankin, Fabio Muleri
https://arxiv.org/abs/2507.15461

Implementing and Verifying a Fourier Domain Approach to Fast Stochastic X-ray Polarimetry Timing
The launch of the Imaging X-ray Polarimetry Explorer (IXPE), the first space-based polarimeter since 1978, offers a two order of magnitude improvement to the measurement of X-ray polarisation than its predecessor OSO-8, offering unprecedented precision for the measurement of polarisation degree and polarisation angle of X-ray sources. This advancement lends itself to the birth of a number of contemporary techniques to study Galactic compact objects, including X-ray polarimetry-timing, the study…

A sublattice Stokes polarimeter for bipartite photonic lattices
Martin Guillot, C\'edric Blanchard, Nicolas Pernet, Martina Morassi, Aristide Lema\^itre, Luc Le Gratiet, Abdelmounaim Harouri, Isabelle Sagnes, Jacqueline Bloch, Sylvain Ravets
https://arxiv.org/abs/2507.16446

A sublattice Stokes polarimeter for bipartite photonic lattices
The concept of pseudo-spin provides a general framework for describing physical systems featuring two-component spinors, including light polarization, sublattice degrees of freedom in bipartite lattices, and valley polarization in 2D materials. In all cases, the pseudo-spin can be mapped to a Stokes vector on the Poincaré sphere. Stokes polarimeters for measuring the polarization of light are a powerful tool with a wide range of applications both in classical and quantum science. Generalizing …

Automated Modeling of Polarons: Defects and Reactivity on TiO$_2$(110) Surfaces
Firat Yalcin, Carla Verdi, Viktor C. Birschitzky, Matthias Meier, Michael Wolloch, Michele Reticcioli
https://arxiv.org/abs/2508.15572

Automated Modeling of Polarons: Defects and Reactivity on TiO$_2$(110) Surfaces
Polarons are widespread in functional materials and are key to device performance in several technological applications. However, their effective impact on material behavior remains elusive, as condensed matter studies struggle to capture their intricate interplay with atomic defects in the crystal. In this work, we present an automated workflow for modeling polarons within density functional theory (DFT). Our approach enables a fully automatic identification of the most favorable polaronic con…

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Slow neutrons in Palermo: a forgotten conference by Enrico Fermi
Emanuele Goldoni, Ledo Stefanini
https://arxiv.org/abs/2507.16928 https://arxiv.org/pdf/25…

Slow neutrons in Palermo: a forgotten conference by Enrico Fermi
On October 22, 1934, in a famous experiment, Enrico Fermi and his colleagues discovered that a significant increase in induced radioactivity can be obtained when neutrons are slowed down by means of hydrogen atoms. This discovery and its explanation earned him the 1938 Nobel Prize in Physics. One year later, on October 1935, Fermi held a public speech in Palermo, Italy, presenting his findings at the 24th congress of the Italian Society for the Progress of Sciences. The transcription of his spe…

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