Tootfinder

Strain-tunable type-II to type-III & Gimbal nodal line transition in Imm2-phase of Cu$_2$SnS$_3$: An ab-initio study
Prakash Pandey, Sudhir K. Pandey
https://arxiv.org/abs/2507.07618

Strain-tunable type-II to type-III & Gimbal nodal line transition in Imm2-phase of Cu$_2$SnS$_3$: An ab-initio study
Topological nodal line semimetals (NLSMs) represent an intriguing quantum phase, opening new avenues in materials science for practical applications such as anisotropic transport devices, high-mobility conductors, unconventional thermoelectrics, and nonlinear optical devices. Recently, Cu$_2$SnS$_3$ has been theoretically proposed as a type-II NLSM, with its Fermi surface containing only one nodal ring. Here, we demonstrate how uniaxial, equi-biaxial, and equi-triaxial strains affect the nodal …

Characterization of the near-null error components utilized in composite adaptive AMG solvers
Austen J. Nelson, Panayot S. Vassilevski
https://arxiv.org/abs/2509.09023 https://

Characterization of the near-null error components utilized in composite adaptive AMG solvers
We provide a theoretical justification for the construction of adaptive composite solvers based on a sequence of AMG (algebraic multigrid) $μ$-cycle methods that exploit error components that the current solver cannot damp efficiently. Each solver component is an aggregation based AMG where its aggregates are constructed using the popular in graph community detection modularity matrix. The latter utilizes the given matrix and the error component vector the current solver cannot handle. The per…

Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
Anne E. Peck (Department of Astronomy, New Mexico State University), Eric L. Nielsen (Department of Astronomy, New Mexico State University), Robert J. De Rosa (European Southern Observatory), William Thompson (National Research Council, Herzberg Astronomy and Astrophysics), Bruce Macintosh (Department of Astronomy and Astrophysics, U…

Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
Directly imaged substellar companions with well-constrained ages and masses serve as vital empirical benchmarks for planet formation and evolution models. Potential benchmark companions can be identified from astrometric accelerations of their host stars. We use Gaia DR3 and Hipparcos astrometry to identify 166 northern hemisphere stars with astrometric accelerations consistent with a substellar companion between 0.5'' and 1''. For this accelerating sample we identify young stars using APO/ARCE…

Trans-series from condensates in the non-linear sigma model
Yizhuang Liu, Marcos Mari\~no
https://arxiv.org/abs/2507.02605 https://ar…

Trans-series from condensates in the non-linear sigma model
In this work we provide a massless perturbative framework for the two dimensional non-linear sigma model (NLSM), that allows the computation of the perturbative series attached to the operator condensates in the operator product expansion (OPE). It is based on a limit of the quartic linear sigma model (LSM) and is manifestly $O(N)$ symmetric. We show, at next-to-leading order in the $1/N$ expansion, how this framework reproduces the perturbative contribution to the two-point function, as well a…

Reshaping the anomalous Hall response in tilted 3D system with disorder correction
Vivek Pandey, Pankaj Bhalla
https://arxiv.org/abs/2507.00744 https://

Reshaping the anomalous Hall response in tilted 3D system with disorder correction
The anomalous Hall conductivity in the nodal line semimetals (NLSMs) due to the presence of a symmetry-protected nodal ring adds complexity in the investigation of their transport properties. By employing quantum kinetic theory and considering the weak disorder limit, we analyze the intraband and interband parts of anomalous Hall conductivity in the tilted 3D Dirac NLSMs. Our findings reveal that the net anomalous response is mainly contributed by the interband part. Further, the latter part gi…

Room-acoustic simulations as an alternative to measurements for audio-algorithm evaluation
Georg G\"otz, Daniel Gert Nielsen, Steinar Gu{\dh}j\'onsson, Finnur Pind
https://arxiv.org/abs/2509.05175

Room-acoustic simulations as an alternative to measurements for audio-algorithm evaluation
Audio-signal-processing and audio-machine-learning (ASP/AML) algorithms are ubiquitous in modern technology like smart devices, wearables, and entertainment systems. Development of such algorithms and models typically involves a formal evaluation to demonstrate their effectiveness and progress beyond the state-of-the-art. Ideally, a thorough evaluation should cover many diverse application scenarios and room-acoustic conditions. However, in practice, evaluation datasets are often limited in siz…

Nonlocal correlations for semiclassical states in loop quantum gravity
Filipe H. C. Menezes, Nelson Yokomizo
https://arxiv.org/abs/2506.19729 https://

Nonlocal correlations for semiclassical states in loop quantum gravity
We compute the two-point correlation function of the area operator for semiclassical states of loop quantum gravity in the limit of large spins. The cases of intrinsic and extrinsic coherent states are considered, along with a new class of semiclassical states constructed as perturbations of Livine-Speziale coherent states. For the usual coherent states, the correlations are shown to be short-ranged, decaying exponentially with the distance. Introducing perturbations given by correlated element…

Transition to chaos with conical billiards
Lara Braverman, David R. Nelson
https://arxiv.org/abs/2508.02786 https://arxiv.org/pdf/2508.02786

Transition to chaos with conical billiards
We adapt ideas from geometrical optics and classical billiard dynamics to consider particle trajectories with constant velocity on a cone with specular reflections off an elliptical boundary formed by the intersection with a tilted plane, with tilt angle $γ$. We explore the dynamics as a function of $γ$ and the cone deficit angle $χ$ that controls the sharpness of the apex, where a point source of positive Gaussian curvature is concentrated. We find regions of the ($γ, χ$) plane where, dep…

Asteroseismology with PBjam 2.0: measuring dipole mode frequencies in coupling regimes from main sequence to low-luminosity red giant stars
M. B. Nielsen, J. M. J. Ong, E. J. Hatt, G. R. Davies, W. J. Chaplin, G. T. Hookway, A. Stokholm, O. J. Scutt, M. N. Lund, R. A. Garc{\i}a
https://arxiv.org/abs/2506.20382

Asteroseismology with PBjam 2.0: measuring dipole mode frequencies in coupling regimes from main sequence to low-luminosity red giant stars
PBjam is an open-source software package for measuring mode frequencies of solar-like oscillators. These frequencies help constrain stellar evolution models to precisely estimate masses, radii, and ages of stars. The overall aim of PBjam is to simplify this process to the point where it may be done by non-experts or performed on thousands of stars with minimal interaction. The initial release of PBjam was restricted to only identifying modes of $\ell=0$ and $\ell=2$, since these are the simples…