Tootfinder

A Residual Prediction Test for the Well-Specification of Linear Instrumental Variable Models
Cyrill Scheidegger, Malte Londschien, Peter B\"uhlmann
https://arxiv.org/abs/2506.12771

A Residual Prediction Test for the Well-Specification of Linear Instrumental Variable Models
The linear instrumental variable (IV) model is widely applied in observational studies. The corresponding assumptions are critical for valid causal inference, and hence, it is important to have tools to assess the model's well-specification. The classical Sargan-Hansen J-test is limited to the overidentified setting, where the number of instruments is larger than the number of endogenous variables. Here, we propose a novel and simple test for the well-specification of the linear IV model under …

Numerical investigation on solids settling in a non-Newtonian slurry inside a horizontal flume
Shubham Sharma, Somasekhara Goud Sontti, Wenming Zhang, Petr Nikrityuk, Xuehua Zhang
https://arxiv.org/abs/2507.11657

Numerical investigation on solids settling in a non-Newtonian slurry inside a horizontal flume
Slurry transportation is always crucial for many industrial processes. This study numerically investigates the settling behavior of multisize solid particles in a non-newtonian slurry inside a semicircular open channel (flume). The non-newtonian slurry is modelled using a three-dimensional (3D) unsteady Eulerian-Eulerian (E-E) model coupled with the Hershel-Bulkley (HB) rheological model. A detailed sensitivity analysis of drag models is performed to establish the solid-fluid interaction in the…

Magneto-elastic softening in cold-sprayed polycrystalline nickel studied by resonant ultrasound spectroscopy
Michaela Janovsk\'a (Institute of Thermomechanics, Czech Acad Sci, Prague, Czechia), Petr Sedl\'ak (Institute of Thermomechanics, Czech Acad Sci, Prague, Czechia), Martin \v{S}ev\v{c}\'ik (Institute of Thermomechanics, Czech Acad Sci, Prague, Czechia), Jan Cizek (Institute of Plasma Physics, Czech Acad Sci, Prague, Czechia, Faculty of Mechanical Engineering, Czech Te…

Magneto-elastic softening in cold-sprayed polycrystalline nickel studied by resonant ultrasound spectroscopy
Cold-sprayed metallic deposits are additively manufactured materials containing high levels of compressive residual stress. Here we show that the presence and intensity of this stress can be analyzed using laser-ultrasonics, provided that the sprayed material is ferromagnetic and magnetostrictive, as in the case of pure nickel. Contactless resonant ultrasound spectroscopy is used to monitor the evolution of shear modulus and internal friction parameter of two polycrystalline Ni deposits with te…

Solving Random Planted CSPs below the $n^{k/2}$ Threshold
Arpon Basu, Jun-Ting Hsieh, Andrew D. Lin, Peter Manohar
https://arxiv.org/abs/2507.10833 https:/…

Solving Random Planted CSPs below the $n^{k/2}$ Threshold
We present a family of algorithms to solve random planted instances of any $k$-ary Boolean constraint satisfaction problem (CSP). A randomly planted instance of a Boolean CSP is generated by (1) choosing an arbitrary planted assignment $x^*$, and then (2) sampling constraints from a particular "planting distribution" designed so that $x^*$ will satisfy every constraint. Given an $n$ variable instance of a $k$-ary Boolean CSP with $m$ constraints, our algorithm runs in time $n^{O(\ell)}$ for a c…

Data Movement Model for the Vera C. Rubin Observatory
Fabio Hernandez (CC-IN2P3/CNRS), Mark G. Beckett (Institute for Astronomy, University of Edinburgh), Andrew Hanushevsky (SLAC National Accelerator Laboratory), Tim Jenness (Vera C. Rubin Observatory Project Office), Kian-Tat Lim (SLAC National Accelerator Laboratory), Peter Love (Lancaster University), Timothy Noble (Rutherford Appleton Laboratory, Science and Technology Facilities Council), Stephen R. Pietrowicz (National Center fo…

Data Movement Model for the Vera C. Rubin Observatory
The sky images captured nightly by the camera on the Vera C. Rubin Observatory's telescope will be processed across facilities on three continents. Data acquisition will occur at the observatory's location on Cerro Pachón in the Andes mountains of Chile. A first copy of the raw image data set is stored at the summit and immediately transmitted via dedicated network links to the archive center within the US Data Facility at SLAC National Accelerator Laboratory in California, USA and from there …

"If you're lucky, reality has all the books you need."
http://www.incidentalcomics.com/2025/06/real-talk.html

Belief propagation for networks with loops: The neighborhoods-intersections-based method
Pedro Hack
https://arxiv.org/abs/2506.13791 https://

Belief propagation for networks with loops: The neighborhoods-intersections-based method
In order to diminish the damaging effect of loops on belief propagation (BP), the first explicit version of generalized BP for networks, the KCN-method, was recently introduced. Despite its success, the KCN-method spends computational resources inefficiently. Such inefficiencies can quickly turn the exact application of the method unfeasible, since its time complexity increases exponentially with them. This affects for instance tree networks, for which, despite not offering any accuracy advanta…

Partition function of 2D Coulomb gases with radially symmetric potentials and a hard wall
Matthias Allard, Peter J. Forrester, Sampad Lahiry, Bojian Shen
https://arxiv.org/abs/2506.14738

Partition function of 2D Coulomb gases with radially symmetric potentials and a hard wall
The large $N$ asymptotic expansion of the partition function for the normal matrix model is predicted to have special features inherited from its interpretation as a two-dimensional Coulomb gas. However for the latter, it is most natural to include a hard wall at the boundary of the droplet. We probe how this affects the asymptotic expansion in the solvable case that the potential is radially symmetric and the droplet is a disk or an annulus. We allow too for the hard wall to be strictly inside…

High-fidelity collisional quantum gates with fermionic atoms
Petar Bojovi\'c, Timon Hilker, Si Wang, Johannes Obermeyer, Marnix Barendregt, Dorothee Tell, Thomas Chalopin, Philipp M. Preiss, Immanuel Bloch, Titus Franz
https://arxiv.org/abs/2506.14711

High-fidelity collisional quantum gates with fermionic atoms
Quantum simulations of electronic structure and strongly correlated quantum phases are widely regarded as among the most promising applications of quantum computing. These simulations require the accurate implementation of motion and entanglement of fermionic particles. Instead of the commonly applied costly mapping to qubits, fermionic quantum computers offer the prospect of directly implementing electronic structure problems. Ultracold neutral atoms have emerged as a powerful platform for spi…

Circular dichroism in the photoelectron angular distribution of achiral molecules
Christian S. Kern, Xiaosheng Yang, Giovanni Zamborlini, Simone Mearini, Matteo Jugovac, Vitaliy Feyer, Umberto De Giovannini, Angel Rubio, Serguei Soubatch, Michael G. Ramsey, F. Stefan Tautz, Peter Puschnig
https://arxiv.org/abs/2507.12113

Circular dichroism in the photoelectron angular distribution of achiral molecules
Circular dichroism in the angular distribution (CDAD) is the effect that the angular intensity distribution of photoemitted electrons depends on the handedness of the incident circularly polarized light. A CDAD may arise from intrinsic material properties like chirality, spin-orbit interaction, or quantum-geometrical effects on the electronic structure. In addition, CDAD has also been reported for achiral organic molecules at the interface to metallic substrates. For this latter case, we invest…