Tootfinder

District heating is one of the solutions for low-emission heating in cities. It's not easy due to high upfront, non-socialized investments and the complicated agreements needed.
But in Delft, a project for 6,000 homes is under construction, with geothermal heat!
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Buis van 180 meter gaat meters diep de grond in voor Delfts warmtenet
8-10-2025 13:57 Door Joey Hut Een 180 meter lange warmteleiding verdwijnt aan de E. du Perronlaan onder de grond. Elf hijskranen tillen de buis op de juiste hoogte, zodat het 45 centimeter dikke gevaarte 16 meter de grond...

Apparent Lorentz violation from disformally coupled ultralight dark matter
Guillem Dom\`enech, Apostolos Tsabodimos, Nathaniel Sherrill, Alexander Ganz, Fiona Kirk
https://arxiv.org/abs/2510.07490

Apparent Lorentz violation from disformally coupled ultralight dark matter
We study the impact of general disformal metric transformations on fermions, which shift the gravitational metric by an additional rank-2 tensor. This tensor can in principle be constructed from scalar-field gradients, vector fields, or field-strength contractions. We show this transformation results in the conventional Dirac action being modified by additional kinetic and axial-current couplings that are quadratic in the shifted field. When the field sourcing the metric shift takes on a non-tr…

The integro-differential closure of a commutative differential ring
Clemens G. Raab, Georg Regensburger
https://arxiv.org/abs/2507.07889 https://

The integro-differential closure of a commutative differential ring
An integro-differential ring is a differential ring that is closed under an integration operation satisfying the fundamental theorem of calculus. Via the Newton--Leibniz formula, a generalized evaluation is defined in terms of integration and differentiation. The induced evaluation is not necessarily multiplicative, which allows to model functions with singularities and leads to generalized shuffle relations. In general, not every element of a differential ring has an antiderivative in the same…

“At what point are folks going to try literally any other tactic than condescending rants? Does it matter that LLM apps are at the top of virtually every app store nearly every day because individual people are choosing to download them[…]?”
https://simonwillison.net/2025/Sep/7/anil-dash/

Crossing over from flat band superconductivity to conventional superconductivity
M. Thumin, G. Bouzerar
https://arxiv.org/abs/2507.07701 https://

Crossing over from flat band superconductivity to conventional superconductivity
Over the past ten years, flat band (FB) or geometric superconductivity has become a major issue in condensed matter physics due to the significant technological benefits it could offer. Observations of this unconventional form of superconductivity are unfortunately still very limited, and significant efforts are being made to search for candidate materials. Most existing theoretical studies focus on systems with strictly non-dispersive bands, which, from an experimental point of view, represent…

A million-solar-mass object detected at cosmological distance using gravitational imaging
D. M. Powell, J. P. McKean, S. Vegetti, C. Spingola, S. D. M. White, C. D. Fassnacht
https://arxiv.org/abs/2510.07382

A million-solar-mass object detected at cosmological distance using gravitational imaging
Structure on sub-galactic scales provides important tests of galaxy formation models and the nature of dark matter. However, such objects are typically too faint to provide robust mass constraints. Here, we report the discovery of an extremely low-mass object detected via its gravitational perturbation to a thin lensed arc observed with milli-arcsecond-resolution very long baseline interferometry (VLBI). The object was identified using a non-parametric gravitational imaging technique and confir…

Isoperimetric-type inequalities for Mather's $\beta$-function of convex billiards
Stefano Baranzini, Misha Bialy, Alfonso Sorrentino
https://arxiv.org/abs/2509.06915 https:/…

Isoperimetric-type inequalities for Mather's $β$-function of convex billiards
In this article we discuss pointwise spectral rigidity results for several billiard systems (e.g., Birkhoff billiards, symplectic billiards and $4$-th billiards), showing that a single value of Mather's $β$-function can determine whether a strongly convex smooth planar domain is a disk (or an ellipse, in the affine-invariant case of symplectic billiards). Evoking the famous question "Can you hear the shape of a billiard?", one could say that circular billiards can be heard by a single whisper!…

Quantum criticality and nonequilibrium dynamics on a Lieb lattice of Rydberg atoms
Mark R. Hirsbrunner, Milan Kornja\v{c}a, Rhine Samajdar, Siva Darbha, Majd Hamdan, Jan Balewski, Ermal Rrapaj, Sheng-Tao Wang, Daan Camps, Fangli Liu, Pedro L. S. Lopes, Katherine Klymko
https://arxiv.org/abs/2508.05737

Quantum criticality and nonequilibrium dynamics on a Lieb lattice of Rydberg atoms
Neutral-atom quantum simulators offer a promising approach to the exploration of strongly interacting many-body systems, with applications spanning condensed matter, statistical mechanics, and high-energy physics. Through a combination of quantum experiments, numerical calculations, and analytical methods, we demonstrate a rich set of phenomena accessible on such quantum simulators by studying an array of Rydberg atoms placed on the Lieb lattice. First, we map out the ground states and phase di…

Direct Detection of Known Exoplanets in Reflected Light: Predicting Sky Position with Literature Orbit Solutions
Logan A. Pearce, Jared R. Males, Mary Anne Limbach
https://arxiv.org/abs/2509.06747

Direct Detection of Known Exoplanets in Reflected Light: Predicting Sky Position with Literature Orbit Solutions
The next generation of ground- and space-based observatories will enable direct imaging and characterization of cold, mature planets through thermal emission and, for the first time, reflected light detection. Known RV and astrometrically detected planets provide a known population for detection and characterization observations. However, many of the most promising targets lack orbital parameters of sufficient precision to confidently predict their location on relative to the star for a direct …

An emulator-based forecasting on astrophysics and cosmology with 21 cm and density cross-correlations during EoR
Barun Maity
https://arxiv.org/abs/2509.05096 https://

An emulator-based forecasting on astrophysics and cosmology with 21 cm and density cross-correlations during EoR
The 21 cm signal arising from fluctuations in the neutral hydrogen field, and its cross-correlation with other tracers of cosmic density, are promising probes of the high-redshift Universe. In this study, we assess the potential of the 21 cm power spectrum, along with its cross power spectrum with dark matter density and associated bias, to constrain both astrophysics during the reionization era and the underlying cosmology. Our methodology involves emulating these estimators using an Artificia…