Tootfinder

Non-oscillatory gravitational quasinormal modes of Reissner-Nordstr\"om-de Sitter spacetime
Z. Stuchl\'ik, A. Zhidenko
https://arxiv.org/abs/2506.09829

Non-oscillatory gravitational quasinormal modes of Reissner-Nordström-de Sitter spacetime
Proper oscillation frequencies of black holes (quasinormal modes) of asymptotically de Sitter black holes were extensively studied, yet the non-oscillatory (purely imaginary) branch of modes of gravitational perturbations of the four-dimensional Reissner-Nordström-de Sitter solution was omitted in the literature. This branch of modes appears as deformations of the modes of empty de Sitter space. Here we find accurate numerical values of this branch of quasinormal modes and show that they are r…

Thanks to AI and modern carbon dating techniques, we have a new understanding of when the Dead Sea Scrolls were written – which could revise the story of Judaea.
✅ Dead Sea Scrolls analysis may force rethink of ancient Jewish history
https://archive.ph/YT7XZ
Original post:

The central spectra of massive star-forming galaxies
Jaimie R. Sheil, Michael J. I . Brown, Virginia A. Kilborn, Michelle E. Cluver, Thomas Jarrett
https://arxiv.org/abs/2506.08474

The central spectra of massive star-forming galaxies
We have examined the nuclear spectra of very massive star-forming galaxies at $z \sim 0$ to understand how they differ from other galaxies with comparable masses, which are typically passive. We selected a sample of 126 nearby massive star-forming galaxies ($<100~{\rm Mpc}$, $10^{11.3}~\rm{M_\odot} \leq M_{\rm stellar} \leq 10^{11.7}~\rm{M_\odot}$, $1 ~{\rm M_\odot~yr^{-1}}< {\rm SFR} <13 ~{\rm M_\odot~yr^{-1}}$) from the 2MRS-Bright WXSC catalogue. LEDA morphologies indicate at least 63\% of o…

A Plasma Torus Around a Young Low-Mass Star
Luke G. Bouma, Moira M. Jardine
https://arxiv.org/abs/2506.09116 https://arxiv.org/pdf/25…

A Plasma Torus Around a Young Low-Mass Star
A small fraction of red dwarfs younger than 100 million years show structured, periodic optical light curves suggestive of transiting opaque material that corotates with the star. However, the composition, origin, and even the existence of this material are uncertain. The main alternative hypothesis is that these complex periodic variables (CPVs) are explained by complex distributions of bright or dark regions on the stellar surfaces. Here, we present time-series spectroscopy and photometry of …

Ask yourself: How many water bottles thrown at cops are worth keeping one innocent American* teen out of inhumane #ICE detention?
For anyone criticizing the #LA protests or suggesting they should stop for any reason, let's be clear about the stakes. Read this article (or my summary):
https://abcnews.go.com/US/massachusetts-teen-detained-ice-family-video-ice/story?id=122511685
This 18-year-old was snatched without a warrant, because he was in his dad's car and allegedly (possibly a lie or mistake) his dad drove recklessly. He's been in the US since he was 5, originally on a student visa that's since expired. He is an innocent American, by any reasonable definition of those two words*. Thankfully, he's since been released on bail, but he may yet be held indefinitely in ICE detention (in inhumane conditions that have been repeatedly documented) and/or separated from his family & friends and shipped off to Brazil where he last lived when he was 5 (ICE does not care whether he speaks Portuguese, has any family there, etc), all potentially without due process (though he seems to be getting that in this case). Even if this doesn't happen to Marcelo due to the media attention & protests, it is certainly happening to other innocent Americans throughout the country who aren't as lucky to have people standing up for them.
Here's Marcelo speaking about detention conditions and those he was detained with:
https://youtube.com/shorts/ZpZMUb9aEys?si=bpK-022CU7Acb5RY
Do you know how many kids like Marcelo were detained in LA yesterday? Probably zero, because of the protests, including their confrontational tactics. The most "violence" I've seen (from the protestors) is throwing a water bottle at a line of heavily-armored riot police. So the protests are working to protect the community. If you're suggesting a change in tactics, consider whether your suggested tactics (like pre-scheduled non-confrontational protests that have been happening for weeks) will protect the Marcelos of LA.
*Whether he's innocent or American should not in fact matter, but sadly it might to some reading this. If that's you, you've still got some growing up to do.

"The cult of goal-setting thrives in this illusion. It converts uncertainty into an illusion of progress. It demands specificity in exchange for comfort. And it replaces self-trust with the performance of future-planning."
(Original title: Smart People Don't Chase Goals; They Create Limits)

Smart People Don't Chase Goals; They Create Limits
A few years ago, I sat across from a friend at a late dinner. He was telling me about his new promotion, the big title, the bonus, the corner office. I remember watching his face as he described it. He looked like someone describing a story he’d once believed

Impact of nonlinearities on relativistic dynamical tides in compact binary inspirals
Tristan Pitre, Eric Poisson
https://arxiv.org/abs/2506.08722 https://

Impact of nonlinearities on relativistic dynamical tides in compact binary inspirals
The tidal deformation of a neutron star in a binary inspiral driven by the emission of gravitational waves affects the orbital dynamics and produces a measurable modulation of the waves. Late in the inspiral, a regime of dynamical tides takes over from a prior regime of static tides. A recent analysis by Yu et al. [M.N.R.A.S. 519, 4325 (2022)] reveals that nonlinear aspects of the tidal interaction are important during the regime of dynamical tides. Their theoretical framework is grounded in Ne…

Deriving physical parameters of unresolved star clusters. VIII. Limits of aperture photometry for star cluster studies
Karolis Daugevi\v{c}ius, Eimantas Kri\v{s}\v{c}i\=unas, Erikas Cic\.enas, Rima Stonkut\.e, Vladas Vansevi\v{c}ius
https://arxiv.org/abs/2506.08674

Deriving physical parameters of unresolved star clusters. VIII. Limits of aperture photometry for star cluster studies
Recently, it has been noticed that the discrepancies in the integrated colour indices (CIs) between star clusters and models are mostly due to the projection of bright stars in the apertures. In order to reduce this problem, the method of adaptive aperture photometry has been proposed. This method has been applied to star clusters from the M 31 Panchromatic Hubble Andromeda Treasury (PHAT) survey, and studies show that the adaptive aperture photometry performs better than the conventional appro…

The Evolutionary Path of Star-Forming Clumps in Hi-GAL
Ylenia Maruccia, Stefano Cavuoti, Massimo Brescia, Giuseppe Riccio, Sergio Molinari, Davide Elia, Eugenio Schisano
https://arxiv.org/abs/2506.08905

The Evolutionary Path of Star-Forming Clumps in Hi-GAL
Star formation (SF) studies are benefiting from the huge amount of data made available by recent large-area Galactic plane surveys conducted between 2 μm and 3 mm. Fully characterizing SF demands integrating far-infrared/sub-millimetre (FIR/sub-mm) data, tracing the earliest phases, with near-/mid-infrared (NIR/MIR) observations, revealing later stages characterized by YSOs just before main sequence star appearance. However, the resulting dataset is often a complex mix of heterogeneous and int…

A New Spectral Class of Brown Dwarfs at the Bottom of the IMF in IC 348
K. L. Luhman, C. Alves de Oliveira
https://arxiv.org/abs/2506.08969 https://…

A New Spectral Class of Brown Dwarfs at the Bottom of the IMF in IC 348
In a previous study, we used JWST to identify three new brown dwarfs in the center of a nearby star-forming cluster, IC 348. The faintest object had an estimated mass of 3-4 $M_{\rm Jup}$, making it a contender for the least massive brown dwarf confirmed with spectroscopy. Two of the new brown dwarfs also exhibited absorption features from an unidentified aliphatic hydrocarbon, which were not predicted by atmospheric models and were not previously detected in atmospheres outside of the solar sy…