@qmbphysics.bsky.social
PhD physicist, mainly interested in the quantum many body problem & some AI/ML. I will occasionally post physics stuff. Aka quietphysicist and susurrus1 on other sites.
Maintainer of: @arxiv-nucl-th.bsky.social and @arxiv-nucl-ex.bsky.social
Maintainer of: @arxiv-nucl-th.bsky.social and @arxiv-nucl-ex.bsky.social
Just a hint of pink on the skycam tonight in the northern direction.
November 12, 2025 at 5:03 AM
Just a hint of pink on the skycam tonight in the northern direction.
"Quantum Theory of Angular Momentum" by D. A. Varshalovich et al.
This book is chock-full of useful identities, some that I haven't seen anywhere else. Recommended.
This book is chock-full of useful identities, some that I haven't seen anywhere else. Recommended.
November 11, 2025 at 1:38 AM
"Quantum Theory of Angular Momentum" by D. A. Varshalovich et al.
This book is chock-full of useful identities, some that I haven't seen anywhere else. Recommended.
This book is chock-full of useful identities, some that I haven't seen anywhere else. Recommended.
This evening's skycam view.
November 10, 2025 at 1:48 AM
This evening's skycam view.
The skycam captured a helicopter flying overhead as the streak of light on the right.
November 7, 2025 at 2:21 AM
The skycam captured a helicopter flying overhead as the streak of light on the right.
I want this thing so badly!
source: x.com/EagleAlpha19...
source: x.com/EagleAlpha19...
September 23, 2025 at 2:32 AM
I want this thing so badly!
source: x.com/EagleAlpha19...
source: x.com/EagleAlpha19...
Today's small victory after days of struggling with Racah algebra and incompatible definitions from different sources.
September 17, 2025 at 6:07 PM
Today's small victory after days of struggling with Racah algebra and incompatible definitions from different sources.
That's not the convergence behavior I was hoping for from my code. Needs more work...
September 15, 2025 at 11:14 PM
That's not the convergence behavior I was hoping for from my code. Needs more work...
New books have arrived!
September 14, 2025 at 12:06 AM
New books have arrived!
Work in progress.
Now the instructions say I have to insert that little pin at the bottom into a hole in the railing, but in order to do that I have to pull the whole thing apart and undo all the work I just did to make enough room to insert the pin. 🙄
Now the instructions say I have to insert that little pin at the bottom into a hole in the railing, but in order to do that I have to pull the whole thing apart and undo all the work I just did to make enough room to insert the pin. 🙄
August 10, 2025 at 12:20 AM
Work in progress.
Now the instructions say I have to insert that little pin at the bottom into a hole in the railing, but in order to do that I have to pull the whole thing apart and undo all the work I just did to make enough room to insert the pin. 🙄
Now the instructions say I have to insert that little pin at the bottom into a hole in the railing, but in order to do that I have to pull the whole thing apart and undo all the work I just did to make enough room to insert the pin. 🙄
3D printed for my hobby area, came out pretty nicely. Now working on another one to organize the million cables I have lying around.
July 2, 2025 at 3:51 AM
3D printed for my hobby area, came out pretty nicely. Now working on another one to organize the million cables I have lying around.
And here are the star trails for it:
April 30, 2025 at 2:16 AM
And here are the star trails for it:
Last night's skies.
April 30, 2025 at 12:47 AM
Last night's skies.
It was still pretty cloudy last night, but I did capture some star trails.
April 29, 2025 at 1:10 AM
It was still pretty cloudy last night, but I did capture some star trails.
Star trails from my sky cam from a few nights ago, when the sky was relatively clear.
April 25, 2025 at 12:10 AM
Star trails from my sky cam from a few nights ago, when the sky was relatively clear.
Here is my first pass at the enclosure for the skycam. Because it's fairly well sealed (I even have some putty inside where the power cable comes in to keep out insects), I was a bit concerned about overheating. For now, it's just sitting outside while I monitor CPU temperatures, so no pics yet.
April 21, 2025 at 12:09 AM
Here is my first pass at the enclosure for the skycam. Because it's fairly well sealed (I even have some putty inside where the power cable comes in to keep out insects), I was a bit concerned about overheating. For now, it's just sitting outside while I monitor CPU temperatures, so no pics yet.
Experimenting with the Fuzzy Skin setting in Cura as a way of hiding Z-seams and layer lines: it works really well.
#3Dprinting
#3Dprinting
April 17, 2025 at 1:46 AM
Experimenting with the Fuzzy Skin setting in Cura as a way of hiding Z-seams and layer lines: it works really well.
#3Dprinting
#3Dprinting
I've got my Raspberry Pi all set up to run as a skycam.
Next comes the trickier bit: building an enclosure for it.
Next comes the trickier bit: building an enclosure for it.
April 13, 2025 at 1:25 AM
I've got my Raspberry Pi all set up to run as a skycam.
Next comes the trickier bit: building an enclosure for it.
Next comes the trickier bit: building an enclosure for it.
My patch of sky at dusk.
April 11, 2025 at 2:12 AM
My patch of sky at dusk.
The partly cloudy night sky overhead tonight. The bright light is the moon behind a tree, and the rightmost of the three pinpoints at the top is Mars.
April 7, 2025 at 3:23 AM
The partly cloudy night sky overhead tonight. The bright light is the moon behind a tree, and the rightmost of the three pinpoints at the top is Mars.
Looks a little better with shading and reduced opacity.
March 30, 2025 at 2:24 AM
Looks a little better with shading and reduced opacity.
Work in progress: cutaway view of a contour plot of the calculated density distribution of nucleons inside a 6He nucleus.
The plot still needs tweaking, but not bad.
The plot still needs tweaking, but not bad.
March 26, 2025 at 1:43 AM
Work in progress: cutaway view of a contour plot of the calculated density distribution of nucleons inside a 6He nucleus.
The plot still needs tweaking, but not bad.
The plot still needs tweaking, but not bad.
Spotted today on the UC Berkeley campus.
March 11, 2025 at 1:45 AM
Spotted today on the UC Berkeley campus.
It's a very long way down...
#HorizonZeroDawnRemastered
#HorizonZeroDawnRemastered
January 17, 2025 at 4:44 AM
It's a very long way down...
#HorizonZeroDawnRemastered
#HorizonZeroDawnRemastered
The conclusion of this evening adventures in derivations: only off by 1/3. Progress.
January 17, 2025 at 3:43 AM
The conclusion of this evening adventures in derivations: only off by 1/3. Progress.
January 8, 2025 at 4:19 AM