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#physics

91 posts58 participants14 posts today
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Universität Innsbruck

⭐ 💥 ⭐ Merging stars: For the first time, researchers have observed the fusion of star clusters in dwarf galaxies — a discovery made by chance through observations from the #Hubble space telescope.

Read more in our news article or check out the original study in #Nature:

🆕 uibk.ac.at/en/newsroom/2025/ce

📖 nature.com/articles/s41586-025

The merging process of the star clusters was precisely modeled in computer simulations.
www.uibk.ac.atCelestial spectacle witnessed
More from Universität Innsbruck
#astrodon#physics#astrophysics
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Nicole Sharp

Flying Without a Rudder

Aircraft typically use a vertical tail to keep the craft from rolling or yawing. Birds, on the other hand, maneuver their wings and tail feathers to counter unwanted motions. Researchers found that the list of necessary adjustments is quite small: just 4 for the tail and 2 for the wings. Implementing those 6 controllable degrees of freedom on their bird-inspired PigeonBot II allowed the biorobot to fly steadily, even in turbulent conditions, without a rudder. Adapting such flight control to the less flexible surfaces of a typical aircraft will take time and creativity, but the savings in mass and drag could be worth it. (Image credit: E. Chang/Lentink Lab; research credit: E. Chang et al.; via Physics Today)

Composite image showing the wing and tail positions of PigeonBot II.
#biology#biorobotics#birdFlight
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Anthony David

Weekly lab report:

One day in the lab last week.

I brought my 10yo grandson into the Nathan Campus.
I asked him to bring in his "The Cat in the Box" book that he had personally signed by the author, Chris Ferrie, during the World Science Festival in Brisbane. Did I post on that? Hmmm

Downstairs the Quatum Optics Information Office was abuzz as a senior lecturer brought her recently arrived baby in. People took turns reading/showing the book to the enraptured baby.

Work in the lab consisted of him volunteering to clean out the lab gutters (running water, gas tubing and vacuum outflow). So many dropped nuts, set screws etc. accumulated over decades. I collected some lab data.
We then donned protective glasses, I turned the pump laser key to "ready" and he pressed the button on the laptop screen. I took him around to see the familiar regen buildup on the oscilloscope in conjustion with the expected power meter reading rise.
Nada :( No, he did not break it.
We expect it might be a pockels cell. subsequent current reading displays suggest so. More advice from the supplier.

#phdlife#physics
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Europe Says

europesays.com/1997473/ Bifurcation analysis, modulation instability and dynamical analysis of soliton solutions for generalized (3 + 1)-dimensional nonlinear wave equation with m-fractional operator #BifurcationTheory #Biophysics #Data #GalileanTransformation #Generalized(3 + 1)DimensionalTypeNonlinearWaveEquation #HamiltonianFunction #HumanitiesAndSocialSciences #MathematicsAndComputing #ModifiedSimpleEquationTechnique #multidisciplinary #NonlinearSystems #physics #science

figure 1
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Veronica Olsen 🏳️‍🌈🇳🇴🌻

I'm glad to see there are more data to be found in the run 2 datasets! It will also be interesting to see what comes out of the HL-LHC project. It has already been in the making for years.

I did my 2.5 year fellowship on it in 2017 to 2019, but I'm not very familiar with the interactions they're studying here. W and Z were discovered at CERN in the early 80s though using the LEP accelerator, the LHC's predecessor.

phys.org/news/2025-04-atlas-ho

Phys.org · ATLAS gets under the hood of the Higgs mechanismBy CERN
#Science#HighEnergyPhysics#Physics
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Haderach C. Kwisatch

"Unveiling a hidden pathway

"Before the study, scientists posited that alcohol went straight to the catalyst, where it became hydrogen gas and aldehyde (a molecule that forms when an alcohol molecule oxidizes). From there, the aldehyde, which is a gas at room temperature, escaped into the air. But watching the process unfold revealed a different story.

"Using SMART-EM, the researchers discovered the aldehyde doesn't float away but instead sticks to the catalyst. They also found the aldehydes linked together to form short-chain polymers -- a previously unknown step that appeared to drive the overall reaction. In another surprise, the researchers discovered the aldehyde also reacts with alcohol to form hemiacetal, an intermediate molecule that is then converted into other products.

"To confirm these findings, the team used various microscopy techniques, X-ray analysis, theoretical models and computer simulations. All matched the SMART-EM data."

#science #chemistry #physics sciencedaily.com/releases/2025

ScienceDailyResearchers watch a live catalytic event in real timeA team of scientists has directly observed catalysis in-action at the atomic level. In mesmerizing new videos, single atoms move and shake during a chemical reaction that removes hydrogen atoms from an alcohol molecule. By viewing the process in real time, the researchers discovered several short-lived intermediate molecules involved in the reaction as well as a previously hidden reaction pathway.
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