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Posts by Heather Logan

Photo of a poster for the Carleton Anti-AI Society

Photo of a poster for the Carleton Anti-AI Society

The kids are ok!

19 hours ago 0 0 0 0

I want to see more discussion on the role of consultant use in the deskilling of higher-ed administrations. If the upper admin don't have the capacity to think through problems, why are we employing them?

1 day ago 1 0 0 0

๐Ÿ˜ฑ

2 days ago 2 0 0 0

Just wait till they find out about wheels!

2 days ago 2 0 0 0

Notice that Mark isn't bothering with alt text.

2 days ago 1 0 1 0

I am fully committed to Team Never LLMs.

3 days ago 1 0 1 0
Photo of a wayfinding plaque with a stylized moose, mounted on a large pink boulder outside the Carleton O-Train station.

Photo of a wayfinding plaque with a stylized moose, mounted on a large pink boulder outside the Carleton O-Train station.

I finally got a photo of the one at Carleton!

6 days ago 0 0 1 0

I figure that was why! I got very briefly held up at the Bronson entrance.

6 days ago 0 0 0 0
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@kaiao.fi Your Prez was at my uni this morning! And went skating with our PM!

6 days ago 1 0 1 0

Can't be taking the coal away from the chatbots!

1 week ago 0 0 0 0

Truly the World's Finest Cat.

I think I see a nipple.

1 week ago 1 0 1 0

By smell, I assume?

1 week ago 1 0 0 0

Never mind that a family of skunks will happily de-grub your lawn *while you sleep* for free and with no strings attached!

1 week ago 1 0 1 0

It just occurred to me that the relative viscosities could play a role because of their effect on convection rate. Like how pie filling cools so much more slowly than an equivalently-shaped mass of hot water would. ๐Ÿค”

But yes, heat capacity is going to be super relevant. Your dad rocks!

1 week ago 2 0 1 0

My first crosslist to astro-ph.CO and I immediately get an email from a crackpot begging for an arXiv endorsement. ๐Ÿ˜ฌ

1 week ago 0 0 0 0
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Analytic Approximations for Fermionic Preheating Non-thermal fermions can be produced non-perturbatively in the early universe during coherent oscillations of a scalar field. We explore fermion production in $ฮปฯ•^{4}$ inflation through this mechanism and analyze the momentum spectrum of the fermions produced, which depends on a coupling parameter $q$. For $q \gtrsim 0.01$, the main contribution to the total number density comes from an approximately half-filled Fermi sphere as a result of non-adiabaticity. For $q\lesssim 0.01$, we find that the major contributions instead come from resonance peaks at higher momentum values. We find a simple relation to predict the momentum values corresponding to resonance peaks for any $q$. We also obtain analytic power-law approximations for the total number density of fermions and find that it is proportional to $q^{1/2}$ for $q\lesssim 0.01$ and proportional to $q^{3/4}$ for $q\gtrsim 10$. If fermions produced by this mechanism make up the entirety of dark matter, we estimate lower bounds on their mass.

New paper today! โš›๏ธ

Cool (semi-)analytic results on nonperturbative fermion production during scalar field oscillations (e.g. of the inflaton, post-inflation). Great work by our student Fazlul Yasin as part of his PhD!
arxiv.org/abs/2604.07326

1 week ago 0 0 0 1

Whoa!!

I guess if they form at that size, there's no way for them to puff back up to white-dwarf size... That is wild!

1 week ago 0 0 1 0

When you say tiny, are we talking ~3 solar masses tiny?

Or should I just go read the paper like a grownup.

1 week ago 0 0 1 0

I bet the answer is increasingly "A bot wrote my bio." :(

1 week ago 1 0 1 0

For most schools in the U.S., over budget on alcohol means more than $0.

1 week ago 1 0 0 0

Fake goatees for all crew members.

2 weeks ago 0 0 0 0

Damn this reminds me of that doomed submarine with the bluetooth videogame controller for steering controls.

2 weeks ago 0 0 0 0

The eternal question.

2 weeks ago 0 0 0 0
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The Mitchell and Webb Situation - Farming
The Mitchell and Webb Situation - Farming YouTube video by mitchellandwebbstuff

This reminds me of David Mitchell on farming: www.youtube.com/watch?v=_pDT...

2 weeks ago 1 0 0 0

The author admitted in the article that they use LLMs on a daily basis.

2 weeks ago 0 0 0 0

Too bad it was pretty clearly written by a bot. ๐Ÿ’€

All the phraseology tells are there.

2 weeks ago 0 0 1 0

Just saying, there's nothing stopping tradhusbands from having sex with each other.

2 weeks ago 2 0 0 0

Some time after my Mac updated its OS, I spent two hours I couldn't really spare getting my Fortran compiler to work again. You really don't want to have to do that when you're someplace without decent WiFi, like say halfway to the moon.

2 weeks ago 0 0 0 0

I got excited at "Scalars are all you need...", then realized this isn't about Higgs physics. Darn.

2 weeks ago 1 0 1 0

He gave a great talk at UC Santa Cruz about the Sokal affair while I was a grad student there. I knew who he was because we'd used Ashcroft & Mermin as the textbook for our Solid State Physics course!

I did not know that he coined "shut up and calculate"; will get my attributions right in future!

2 weeks ago 1 0 0 0