Peter Onyisi
@peteronyisi.bsky.social
Professor of Physics at UTAustin. Member of the ATLAS Experiment at the Large Hadron Collider. Particle wrangler, opinionated software user, fan of Texas State Parks, Austin FC, and Newcastle United; sometimes I pick up heavy things.
Having a somewhat odd realization about phase vs group velocities for quantum wave packets and the sign difference between the Hamiltonian and the Lagrangian
November 6, 2025 at 4:44 PM
Having a somewhat odd realization about phase vs group velocities for quantum wave packets and the sign difference between the Hamiltonian and the Lagrangian
It is a, let's say, interesting fact that "academic integrity" is discussed here primarily not as a question of, say, honesty or disclosure of conflicts but as one of "respect for differences" and "balanced treatment of disputed issues"
Texas Statement on Academic Integrity | University of Texas at Austin
www.utexas.edu
November 4, 2025 at 2:22 AM
It is a, let's say, interesting fact that "academic integrity" is discussed here primarily not as a question of, say, honesty or disclosure of conflicts but as one of "respect for differences" and "balanced treatment of disputed issues"
Dunno why the Schengen exit procedures at GVA have been incredibly slow the last few months, but it's pretty ridiculous
November 3, 2025 at 5:15 AM
Dunno why the Schengen exit procedures at GVA have been incredibly slow the last few months, but it's pretty ridiculous
Need more ATLAS shift music. The L1Calo Receiver Blues. The LUCID Calibration Boogaloo. It's A Fast-Driving Rave-Up With The Pixel Warm Start Sixteen Minutes
October 30, 2025 at 11:39 PM
Need more ATLAS shift music. The L1Calo Receiver Blues. The LUCID Calibration Boogaloo. It's A Fast-Driving Rave-Up With The Pixel Warm Start Sixteen Minutes
Congrats to the authors, I cannot stress how annoying this process is to measure
The production of top quark pairs together with a W boson is a great way to test the quality of standard model predictions. This #CMSPaper measures provides boundaries on things like the difference between ttW+/- production, a very sensitive quantity to test the predictions arxiv.org/abs/2509.13512
October 26, 2025 at 1:48 PM
Congrats to the authors, I cannot stress how annoying this process is to measure
Reposted by Peter Onyisi
The production of top quark pairs together with a W boson is a great way to test the quality of standard model predictions. This #CMSPaper measures provides boundaries on things like the difference between ttW+/- production, a very sensitive quantity to test the predictions arxiv.org/abs/2509.13512
October 26, 2025 at 1:03 PM
The production of top quark pairs together with a W boson is a great way to test the quality of standard model predictions. This #CMSPaper measures provides boundaries on things like the difference between ttW+/- production, a very sensitive quantity to test the predictions arxiv.org/abs/2509.13512
One of CERN's resident magpies
October 26, 2025 at 1:43 PM
One of CERN's resident magpies
If the Hamiltonian flow of everyone in your neighborhood has brought them to bigotry, well...
October 23, 2025 at 6:55 PM
If the Hamiltonian flow of everyone in your neighborhood has brought them to bigotry, well...
"The cultivated mind is the guardian genius of democracy" is a quote that pretty clearly terrifies certain people
October 22, 2025 at 3:41 PM
"The cultivated mind is the guardian genius of democracy" is a quote that pretty clearly terrifies certain people
The thing about her list of complaints about academia (protests! chronicling Western oppression! research with no practical benefit! the CDC for some reason!) is that they can only be addressed by reducing the scope of things people do in universities, which doesn't sound like "viewpoint diversity"
The definition of “viewpoint diversity” that figures like this promote implies *censorship* (the “must” part): curbing some forms of expression to boost others. It’s an invention of orgs who advocate government censorship of teaching/research + restrictions on protected political speech in colleges.
October 20, 2025 at 3:59 PM
The thing about her list of complaints about academia (protests! chronicling Western oppression! research with no practical benefit! the CDC for some reason!) is that they can only be addressed by reducing the scope of things people do in universities, which doesn't sound like "viewpoint diversity"
brb expressing the size of the Argentina bailout in FCC-ee units
October 15, 2025 at 11:40 PM
brb expressing the size of the Argentina bailout in FCC-ee units
Reposted by Peter Onyisi
I'm always vaguely astonished at how cartoonish these people wind up being. If the school leadership is so certain it's doing the right thing, why the fear of student journalists?
Indiana University has fired the staff director of the student newspaper, after disputes in which university leadership tried to pressure him to prevent students from publishing news.
October 15, 2025 at 2:47 AM
I'm always vaguely astonished at how cartoonish these people wind up being. If the school leadership is so certain it's doing the right thing, why the fear of student journalists?
October 13, 2025 at 1:28 AM
Discovering French conjugations I never knew existed. "Je me souvinsse"?
October 9, 2025 at 3:32 PM
Discovering French conjugations I never knew existed. "Je me souvinsse"?
One's complement-ass elevator
October 9, 2025 at 12:08 PM
One's complement-ass elevator
Which is, perhaps, the point
From 2023:
"People who lack experience, do not care about core organizational goals, will not listen to stakeholders, and are hell-bent on pursuing their narrow ideological agenda will ultimately destroy the organizations they are charged with leading."
donmoynihan.substack.com/p/new-colleg...
"People who lack experience, do not care about core organizational goals, will not listen to stakeholders, and are hell-bent on pursuing their narrow ideological agenda will ultimately destroy the organizations they are charged with leading."
donmoynihan.substack.com/p/new-colleg...
New College is a warning about the price of populist incompetence
What happens when inexperienced radicals can't run public services
donmoynihan.substack.com
October 3, 2025 at 1:53 PM
Which is, perhaps, the point
Reposted by Peter Onyisi
✴️For the first time since 1945, UT does not have a representative faculty council.
Our press release on the replacement of an elected Faculty Council with faculty advisory bodies composed entirely of appointees of President Davis.
docs.google.com/document/d/1...
Our press release on the replacement of an elected Faculty Council with faculty advisory bodies composed entirely of appointees of President Davis.
docs.google.com/document/d/1...
Press Release 9.27.2025.docx
PRESS RELEASE American Association of University Professors (AAUP) chapter at The University of Texas at Austin Contact: Pauline Strong, PhD, Chapter President, strongpolly@gmail.com _________________...
docs.google.com
September 27, 2025 at 1:16 PM
✴️For the first time since 1945, UT does not have a representative faculty council.
Our press release on the replacement of an elected Faculty Council with faculty advisory bodies composed entirely of appointees of President Davis.
docs.google.com/document/d/1...
Our press release on the replacement of an elected Faculty Council with faculty advisory bodies composed entirely of appointees of President Davis.
docs.google.com/document/d/1...
SPEAKING FOR MYSELF (because apparently it needs to be said) the regents and administration might want to ask themselves if this is really a precedent they want to set
⭐️⭐️ Compact sent by the Trump administration to nine institutions of higher education, including UT Austin, available here:
I just saw a copy. Will send it in a series of screenshots to protect the source.
October 2, 2025 at 7:30 PM
SPEAKING FOR MYSELF (because apparently it needs to be said) the regents and administration might want to ask themselves if this is really a precedent they want to set
It's always fascinating which things are assumed to be common knowledge in different eras. "... the well-known result that the phase of the wave function corresponds to Hamilton's principle [sic] function in classical theory" oh is it well known?
September 30, 2025 at 12:11 AM
It's always fascinating which things are assumed to be common knowledge in different eras. "... the well-known result that the phase of the wave function corresponds to Hamilton's principle [sic] function in classical theory" oh is it well known?
"Well, how did I get here?"
- David Byrne on determining trajectories via least action
- David Byrne on determining trajectories via least action
September 29, 2025 at 10:20 PM
"Well, how did I get here?"
- David Byrne on determining trajectories via least action
- David Byrne on determining trajectories via least action
Yeah I read theory
September 29, 2025 at 9:57 PM
Yeah I read theory
Apparently "Bashfest 2025" is some astronomy thing and not a celebration of shell scripting?
September 29, 2025 at 5:07 PM
Apparently "Bashfest 2025" is some astronomy thing and not a celebration of shell scripting?