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@arXiv_mathAP_bot@mastoxiv.page
2025-06-13 09:06:30

New class of time-periodic solutions to the 1D cubic wave equation
Filip Ficek, Maciej Maliborski
arxiv.org/abs/2506.10839

New class of time-periodic solutions to the 1D cubic wave equation
In recent papers (arXiv:2407.16507, arXiv:2408.05158) we presented results suggesting the existence of a new class of time-periodic solutions to the defocusing cubic wave equation on a one-dimensional interval with Dirichlet boundary conditions. Here we confirm these findings by rigorously constructing solutions from this class. The proof uses rational arithmetic computations to verify essential operator bounds.

@arXiv_astrophCO_bot@mastoxiv.page
2025-06-13 08:49:40

Testing the local supervoid solution to the Hubble tension with direct distance tracers
Richard Stiskalek, Harry Desmond, Sergij Mazurenko, Indranil Banik
arxiv.org/abs/2506.10518

Testing the local supervoid solution to the Hubble tension with direct distance tracers
Several observational studies suggest that the local few hundred Mpc around the Local Group are significantly underdense based on source number counts in redshift space across much of the electromagnetic spectrum, particularly in near-infrared galaxy counts. This ``Keenan--Barger--Cowie (KBC) void'', ``Local Hole'', or ``local supervoid'', would have significant ramifications for the Hubble tension by generating outflows that masquerade as an enhanced local expansion rate. We evaluate models fo…

@kurtsh@mastodon.social
2025-06-13 02:07:20

Dear God... Kristi Noem is a certified PoS.
Republican dog lovers: Look yourself in the mirror & say outloud that you won't stand by this level of cruelty.
☑️ Kristi Noem Dog-Killing Story Is Actually Worse in Context
nymag.com/intelligencer/articl…

Kristi Noem Dog-Killing Story Is Actually Worse in Context
The Kristi Noem dog-killing story is actually worse in context. The governor is encouraging people to read her new book, ‘No Going Back,’ and judge the anecdote about fatally shooting her dog, Cricket, for themselves. She probably shouldn’t.

@arXiv_csRO_bot@mastoxiv.page
2025-06-13 08:06:50

Multi-Timescale Dynamics Model Bayesian Optimization for Plasma Stabilization in Tokamaks
Rohit Sonker, Alexandre Capone, Andrew Rothstein, Hiro Josep Farre Kaga, Egemen Kolemen, Jeff Schneider
arxiv.org/abs/2506.10287

Multi-Timescale Dynamics Model Bayesian Optimization for Plasma Stabilization in Tokamaks
Machine learning algorithms often struggle to control complex real-world systems. In the case of nuclear fusion, these challenges are exacerbated, as the dynamics are notoriously complex, data is poor, hardware is subject to failures, and experiments often affect dynamics beyond the experiment's duration. Existing tools like reinforcement learning, supervised learning, and Bayesian optimization address some of these challenges but fail to provide a comprehensive solution. To overcome these limi…

@arXiv_condmatmtrlsci_bot@mastoxiv.page
2025-06-12 09:05:11

Engineering topological phase transitions via sliding ferroelectricity in MBi2Te4 (M = Ge, Sn, Pb) bilayers
Xinlong Dong, Dan Qiao, Zeyu Li, Zhenhua Qiao, Xiaohong Xu
arxiv.org/abs/2506.09317

Engineering topological phase transitions via sliding ferroelectricity in MBi2Te4 (M = Ge, Sn, Pb) bilayers
Materials combining electrically switchable ferroelectricity and tunable topological states hold significant promise for advancing both foundamental quantum phenomena and innovative device architectures. Here, we employ first-principles calculations to systematically investigate the sliding ferroelectricity-mediated topological transitions in bilayer MBi2Te4 (M = Ge, Sn, Pb). By strategically engineering interlayer sliding configurations with oppositely polarized states, we demonstrate reversib…

@arXiv_hepth_bot@mastoxiv.page
2025-06-13 09:27:20

Rotating Carroll Black Holes: A No Go Theorem
Ivan Kol\'a\v{r}, David Kubiznak, Poula Tadros
arxiv.org/abs/2506.10451

Rotating Carroll Black Holes: A No Go Theorem
Recently, there has been a lot of interest in Carroll black holes and in particular whether or not one could find a Carrollian analogue of a rotating black hole spacetime. Here we show that every stationary and axisymmetric solution (and thence also a black hole) of Carrollian general relativity in any number of $d\geq 3$ dimensions is necessarily also static. Using this result, we construct a unique stationary and axisymmetric black hole in three dimensions - a static Carroll BTZ black hole. A…

@arXiv_mathAP_bot@mastoxiv.page
2025-06-13 09:12:10

Normalized solutions for a Sobolev critical quasilinear Schr\"odinger equation
Yuxin Li, Meijie Yang, Xiaojun Chang
arxiv.org/abs/2506.10870

Normalized solutions for a Sobolev critical quasilinear Schrödinger equation
In this paper, we study the existence of normalized solutions for the following quasilinear Schrödinger equation with critical exponent: \begin{equation*} -Δu-uΔ(u^2)+λu=τ|u|^{q-2}u+|u|^{2\cdot2^*-2}u,~~~~x\in\R^N, \end{equation*} under the mass constraint $\int_{\R^N}|u|^2dx=c$ for some prescribed $c>0$. Here $τ\in \mathbb{R}$ is a parameter, $λ\in\R$ appears as a Lagrange multiplier, $N\ge3$, $2^*:=\frac{2N}{N-2}$ and $2

@pre@boing.world
2025-06-02 20:28:08
Content warning: re: Doctor Who - Reality War
:tardis:

Confusing episode. Let me clear it all up.
The world is sinking into the doubt needed to rescue Omega, remember, and The Doctor is falling with a balcony that's separated from the building.
How does he get out of that?
Well, saved by a literal magic door that pops out of nowhere, leading back to the time hotel. 🤨
Anita, who he spent a year with once a couple of Christmases ago, has been popping around the Doctor's entire long life, peeping on him with the Daleks and stuff. Trying to find him on the Earth's last day. Today.
And now he's rescued, today turns into a groundhog day. Same day over and over again. 😆
There's another woman that's been stalking him through time lately, Mrs Flood. She was following him everywhere, but she had Xmas off she reckons, so didn't see the Time Hotel bit. Thus the element of surprise in the deus ex machina rescue. 😀
The Doctor is broken free of the wish spell now anyway, popped his conditioning, and can use the time hotel's door to recall Unit and break them all out of the wish too.
The Rani pops in to say hi and explain her plans. 😝
How did the Rani survive the end of the Timelords? She flipped her DNA to sidestep the genetic bomb apparently? Well that makes no sense, but nor does anything else so no time to ponder.
The end of the Time Lords made them all Barons... No, made them barren. There can be no more children of the time-lords.
She's popping Omega back out of the underworld for his DNA because the timelords are all barren and she wants to recreate Galifrey.
But wait a minute: Poppy is the Doctor's kid in wish world! So she should have Timelord DNA too! Maybe that could work?
No. The Rani is a nazi, don't like the kid's contaminated blood. She's got human all over her DNA. Eww.
Rani pops off back to her Bone Palace, and makes the bone beasts attack.
The Doctor explains that the Giant dinosaur skeletons are beasts that pop in to clean up the world when there's a reality flux, and the Rani has turned them on Unit HQ.
So the UNIT HQ turns into some kinda ship? Like the Crimson Permanent Insurance. Lol. It's blasting lasers at the bone beasts and turning around, and has a steering wheel like pirate ship now. 🤣
During the battle, the Doctor pops out to take a ride on the sky-bike, looking like something from Flash Gordon, and crashes into the Bone Palace.
Too late though! Omega is pretty much here now. He's a giant boney CGI zombie, become his own legend. Looks great but doesn't really seem like Omega, who ought to be held together by pure will.
Omega eats the Rani! One of the Ranis anyway. Mrs Flood avoids being eaten. She pops off with the time bracelet. "So much for the Two Rani's. It's a goodnight from me!" as she disappears off into time. Great gag. 😁
The Doctor just shoots Omega to get him back into his box. Pops a rifle off the wall. The Vindicator has apparently also got a built in laser as well as locator beacons. So that's handy. The Doctor doesn't use guns but some of his devices work like one. 🔫
So all is well! The day is saved and the wish is over and baby Poppy survives in a time box! 🍻
They're going to take the space baby off to do space adventures. Ruby is jealous of seeing The Doctor and Belinda vibing like that, as they plan a life in space with the space baby. Aww. Poor Ruby. 😭
But then Poppy pops off! Disappears entirely, and everyone other than Ruby forgets. Ruby remembers because she's disappeared from time herself in the past they say.
Okay: to save his child and on Ruby's word alone, the Doctor will sacrifice himself to turn reality one degree.
He goes off to commit suicide by Regeneration, but Thirteen is here! She's popped out of her timeline to stop him! Or maybe to help, with a motivational chat instead. Gives him a pep talk then pops back off again.
The Doctor zaps reality with his Tardis, dying but holding off on the actual regeneration for a few moments to go check on the kid.
The kid is safe! But isn't his own kid any more. Poppy has popped all her Timelord DNA and is just all human now. Poppy's pop isn't the doc, it's someone called Richie.
And Belinda has been so keen to get home all this time in order to get back to her Baby! Who isn't a timelord, and definitely didn't exist until she was wished into being.
This may not be the most ethical action The Doctor has ever taken: To bend the whole universe in order to recreate a baby that was accidentally wished into being out of nothing. Twisting time to give a child to a nurse who didn't previously have a child, or even remember the wish. Then it's not even the same child that disappeared, coz this one is all human. 🤷
But the doc is popping off to regenerate with Joy in the stars, and... Turns blonde: "oh. Hello?" 🤯
It's Rose! Billie Piper is back? Fantastic!
Is Rose doing a David Tennant Impression there?
Billie playing the Doctor, doing a Tennant impression as Bad Wolf? Amazing. Can't wait.
:tardis:
#doctorWho

@krasse_eloquenz@literatur.social
2025-05-11 14:57:46

Apropos Muttertag:
Frauen kommen auch auf der Bühne nicht so gut weg: Werden beim Impro Frauen dargestellt, kommen schnell Klischees a la Chantal ins Spiel: Die Frauen kämmen sich die Haare oder ziehen sich vor dem Spiegel an.
Frauen bekommen dort oft Rollen zugewiesen (vom Publikum oder Mitspielenden): meist als Freundin oder Mutter. Wohingegen es „den Vater“ deutlich seltener gibt. Männer können auf der Bühne einfach alles sein.1/2

@arXiv_mathAP_bot@mastoxiv.page
2025-06-12 08:07:11

Slowly oscillating periodic solutions in a nonlinear Volterra equation with non-symmetric feedback
Quentin Griette, Franco Herrera
arxiv.org/abs/2506.09564

Slowly oscillating periodic solutions in a nonlinear Volterra equation with non-symmetric feedback
In this work we study a nonlinear Volterra equation with non-symmetric feedback that arises as a particular case of the Gurtin-MacCamy model in population dynamics. We are particularly interested in the existence of slowly oscillating periodic solutions when the trivial stationary state is unstable. Here the absence of symmetry of the nonlinearity prevents the use of many traditional strategies to obtain a priori estimates on the solution. Without a precise knowledge of the period of the soluti…