Tootfinder

Holy Crap. Today's ride home was insane. My chain came off, had to pull over to fix it, simple, no issue. But then as I had to wait at a stoplight this pickup truck took off when the light turned green and these two bins slide right out the back onto the road! As the bins hit a box of nails explodes and these little nails with orange discs fly everywhere. (Stock photo included because it was such chaos I did not get a photo.)
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Probability distribution reconstruction using circuit cutting applied to a variational classifier
Niels M. P. Neumann, Carlos M. R. Rocha, Jasper Verbree, Marc van Vliet
https://arxiv.org/abs/2510.03077

Probability distribution reconstruction using circuit cutting applied to a variational classifier
Significant efforts are being spent on building a quantum computer. At the same time, developments in quantum software are rapidly progressing. Insufficient quantum resources often are the problem when running quantum algorithms. New techniques can aid in using smaller quantum computers to run larger quantum algorithms. One of these techniques is circuit cutting. With this method, a circuit is broken into multiple pieces, each of which is run on quantum hardware independently and then recombine…

Analysis of Broad Beam Beamforming for Collocated and Distributed MIMO
Ahmet Kaplan, Diana P. M. Osorio, Erik G. Larsson
https://arxiv.org/abs/2508.02135 https://

Analysis of Broad Beam Beamforming for Collocated and Distributed MIMO
Broad beam beamforming (BF) design in multiple-input multiple-output (MIMO) can be convenient for initial access, synchronization, and sensing capabilities in cellular networks by avoiding overheads of sweeping methods while making efficient use of resources. Phase-only BF is key for maximizing power efficiency across antennas. A successful method to produce broad beams is the phase-only dual-polarization BF (DPBF). However, its efficiency has not been proved in non-line-of-sight (NLoS). Theref…

Compactness of compositions of strictly singular operators on direct sums of Baernstein, Schreier and $\ell_p$-spaces
Niels Jakob Laustsen, Henrik Wirzenius
https://arxiv.org/abs/2509.02405

Compactness of compositions of strictly singular operators on direct sums of Baernstein, Schreier and $\ell_p$-spaces
Let $X$ be the direct sum of finitely many Banach spaces chosen from the following three families: (i) the Baernstein spaces $B_p$ for $1

Quantum carrollian bosonic strings
Jos\'e Figueroa-O'Farrill, Emil Have, Niels A. Obers
https://arxiv.org/abs/2509.04397 https://arxiv.org/pdf/2509…

Quantum carrollian bosonic strings
We study a recently discovered carrollian bosonic string, described classically by a sigma model where both the worldsheet and the target spacetime are carrollian. After fixing the carrollian analogue of the conformal gauge, we determine the Lie algebra of residual gauge symmetries and show it is isomorphic to the three-dimensional extended BMS algebra. We quantise the sigma model à la BRST and determine the spectrum of the corresponding string theory by computing the BRST cohomology. In contr…

On-Chip Frequency Noise Cancellation in Nanomechanical Resonators using Cavity Optomechanics
Bhavesh Kharbanda, Amirali Arabmoheghi, Letizia Catalini, Mohammad Bereyhi, Geena Benga, Alessio Zicoschi, Christian L. Degen, Tobias J. Kippenberg, Alexander Eichler, Nils J. Engelsen
https://arxiv.org/abs/2508.03301…

On-Chip Frequency Noise Cancellation in Nanomechanical Resonators using Cavity Optomechanics
Understanding and minimizing the sources of frequency noise in nanomechanical resonators is crucial for many sensing applications. In this work, we report an ultracoherent perimeter-mode nanomechanical resonator co-integrated with an on-chip optical cavity. This device combines low thermomechanical force noise and low detector noise, allowing us to study its intrinsic frequency fluctuations in detail. We find that the fluctuations of two mechanical modes are strongly correlated. Moreover, we de…

Oh, Hacker News…FFS. Something got lost in the sad game of Popular Press Telephone between the actual study and this snotty post.
The actual study is here:
https://www.acpjournals.org/doi/10.7326/ANNALS-25-00577
It notes that:
1. Most research on air cleaning devices used air samples, not human health outcomes. (It’s far more difficult to conduct a study on the latter.)
2. Not many people are studying whether e.g. UV air purifiers create toxic byproducts.
3. The available studies sure do measure a whole bunch of different things, and wouldn’t it be nice if they had more consistent standards.
Their main recommendation is basically “scientists should do more studies where they measure infection in humans, not just germs in the air.” And that’s fair: It’s reasonable to •guess• that fewer germs in the air means less sickness, but it’s nice to actually •test• that!
However, AFAICT, nothing in the study warrants the “tinfoil hats” remark. Unlike a tinfoil hats, we have plenty good reason to think at least some of these devices actually work; the paper just wants the research to go deeper. It’s one giant “further study needed.” https://mastodon.social/@ngate/115091700894746240

Analyzing and Evaluating the Behavior of Git Diff and Merge
Niels Glodny
https://arxiv.org/abs/2507.22071 https://arxiv.org/pdf/2507.22071

Analyzing and Evaluating the Behavior of Git Diff and Merge
Despite being widely used, the algorithms that enable collaboration with Git are not well understood. The diff and merge algorithms are particularly interesting, as they could be applied in other contexts. In this thesis, I document the main functionalities of Git: how diffs are computed, how they are used to run merges, and how merges enable more complex operations. In the process, I show multiple unexpected behaviors in Git, including the following: The histogram diff algorithm has pathologic…

Tracing Red Giant Members of the Globular Cluster Palomar 5 with APOGEE and Gaia
Allyson A. Sheffield, Sarah Pearson, Lenin F. Nolasco, Rachael L. Beaton, Adrian M. Price-Whelan, Katia Cunha, Verne V. Smith, Rafael Guerco
https://arxiv.org/abs/2507.21212

Tracing Red Giant Members of the Globular Cluster Palomar 5 with APOGEE and Gaia
The globular cluster Palomar 5 (Pal 5) is in the process of being tidally shredded as it orbits the Milky Way. Its core is currently at a heliocentric distance of ~21 kpc, near apogalacticon (~18 kpc), and it reaches ~5-7 kpc at perigalacticon. Pal 5's leading and trailing arms stretch over 20 degrees on the sky, making them sensitive probes of the Milky Way's mass distribution. In this work, we search for red giant members of Pal 5 using spectroscopic data from APOGEE DR17 and photometric and …

Cram\'er-Rao Bound for Direct Position Estimation in OFDM Based Cellular Systems
Sijia Li, Rui Sun, Bing Xu, Yuanwei Liu
https://arxiv.org/abs/2508.02559 https://

Cramér-Rao Bound for Direct Position Estimation in OFDM Based Cellular Systems
Although direct position estimation (DPE) has been demonstrated to offer enhanced robustness in GNSS receivers, its theoretical limits and performance in OFDM based positioning systems remain largely unexplored. In this paper, the Cramér-Rao bound (CRB) for DPE using OFDM based cellular signals is derived and benchmarked against the conventional two-step positioning method to assess their relative performance in non-line-of-sight (NLOS) dominated multipath environments. Numerical results revea…