Tootfinder

Here’s the view from the official web cam at the #AlpineVisitorCenter in #RockyMountainNationalPark on Tuesday, October 7, 2025

Parting the clouds, the light showing us the path ahead...
(From a scenic hike two months ago, when we went over the pass [Rossgundscharte] above the tiny snow patch in the distance on the right hand side of the image...)
#SilentSunday #MountainMonday

This weekend I went out past Newark Valley to Oakley Corners State Forest which has two fair sized ponds -- this one has an island in it
#photo #photography #landscape

#Nuke will apply OCIO color transforms to all EXR layers in its write node and that sucks. It makes the color transform knob useless whenever you want to output matte layers nowadays (because of scene-linear vs ap0).
Nuke even mangles mono-channel layers by treating them as a red channel and inventing blank green and blue channels to do gamut transforms with (it probably has a list of special c…

$ L_\infty $-spectral sequences for Hochschild cohomology
Jasper van de Kreeke
https://arxiv.org/abs/2508.21716 https://arxiv.org/pdf/2508.21716

$ L_\infty $-spectral sequences for Hochschild cohomology
Spectral sequences are a common tool to compute cohomology spaces, but higher structure is often lost on the way. In this article we exhibit a strategy to retain the higher structure on the cohomology, which works in case the chain complex with higher structure is presented as the twisting of a simpler chain complex by a Maurer-Cartan element. This works particularly well in case of the Hochschild complex of a minimal $ A_\infty $-category, where the Hochschild complex can be seen as the twisti…

Unified interpretation of 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model
Qin Chang, Xiaokang Du, Pengxuan Zhu
https://arxiv.org/abs/2509.26155 https://…

Unified interpretation of 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model
We revisit the 95 GeV excesses in the $γγ$ and $ττ$ channels in the Georgi-Machacek model, where a single light $CP$-even custodial singlet $H$ can account for both hints. Using one-loop renormalization group-improved effective potential and positive-definiteness conditions for vacuum stability, together with perturbative unitarity, electroweak precision tests, $B$-physics, and Higgs data, we identify a narrow but viable parameter region. In this region, charged and doubly charged scalars e…

Classical BV cohomology of the $N=1$ spinning particle
Eugenia Boffo, Martin Cederwall
https://arxiv.org/abs/2510.00655 https://arxiv.org/pdf/2510.00655

Classical BV cohomology of the $N=1$ spinning particle
We show that the classical Batalin--Vilkovisky cohomology at negative ghost number of the spinning particle, observed in ref. arXiv:1511.02135, is removed by a Koszul--Tate resolution involving saturation of Grassmann odd variables. The model thus satisfies the axioms of Felder and Kazhdan. The AKSZ formulation of the resolved model is described. We reveal partial information on the resolution of the constrained phase space, which involves resolving the parity-shifted tangent sheaf of the light…

The Euler characteristic of $\ell$-adic local systems on $\mathcal{A}_n$
Olivier Ta\"ibi
https://arxiv.org/abs/2510.00656 https://arxiv.org/pdf/2510.0…

The Euler characteristic of $\ell$-adic local systems on $\mathcal{A}_n$
We study the Euler characteristic of $\ell$-adic local systems on the moduli stack $\mathcal{a}_n$ of principally polarized abelian varieties of dimension $n$ associated to algebraic representations of $\mathbf{GSp}_{2n}$, as virtual representations of the absolute Galois group of $\mathbb{Q}$ and the unramified Hecke algebra of $\mathbf{GSp}_{2n}$. To this end we take the last steps of the Ihara-Langlands-Kottwitz method to compute the intersection cohomology of minimal compactifications of Si…

Unstable elements in cohomology and a question of Lescot
Srikanth B. Iyengar, Sarasij Maitra, Tim Tribone
https://arxiv.org/abs/2507.23213 https://arxiv.or…

Unstable elements in cohomology and a question of Lescot
In his work on the Bass series of syzygy modules of modules over a commutative noetherian local ring $R$, Lescot introduces a numerical invariant, denoted $σ(R)$, and asks whether it is finite for any $R$. He proves that this is so when $R$ is Gorenstein or Golod. In the present work many new classes of rings $R$ for which $σ(R)$ is finite are identified. The new insight is that $σ(R)$ is related to the natural map from the usual cohomology of the module to its stable cohomology, which permi…

Probing the coupling of axions to tops and gluons with LHC measurements
Jon Butterworth, Matthew Cullingworth, Joseph Egan, Fabian Esser, Veronica Sanz, Maria Ubiali
https://arxiv.org/abs/2508.21660

Probing the coupling of axions to tops and gluons with LHC measurements
We study axion-like particles (ALPs) whose dominant interactions are with gluons and third-generation quarks, and whose couplings to light Standard Model (SM) particles arise at one loop. These loop-induced effects lead to ALP decays and production channels that can be probed at the LHC, even when tree-level couplings are absent. Using an effective field theory (EFT) description that includes momentum-dependent corrections from radiative effects, we reinterpret a wide range of LHC measurements …