Theoretical physicist (AB Harvard '01; PhD Caltech '06). Prof. at U. of Costa Rica. Ulam Fellow at U. of Gdańsk, 2020-21. Keepin' it sciency.
Gdańsk, Poland
Joined May 2018
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Out today on the Arxiv: my work with Robert Alicki and Gabriela Barenboim on the "Quantum thermodynamics of de Sitter space". This longer paper is accompanied by another shorter paper on the consequences for cosmology. 1/2 arxiv.org/abs/2307.04800
"Recently, V. López-Barquero et al. (2026) proposed a corona self-oscillation model for QPOs and predicted softer spectra [...] at higher QPO fluxes [...] in excellent agreement with what we see in Figure 2(b)." doi.org/10.3847/1538-4357/ae… via @AAS_Publishing
Alejandro Jenkins retweeted
"He overthrew the Stuart monarchy is what he did! He was a bourgeois revolutionary! And in this house Oliver Cromwell is a historically progressive force! End of story!"
Whatever is going on here, it's a self-oscillation. The sound suggests that the water is being moved by the wind, but some quite non-trivial feedback between water and air is needed to explain how a steady wind maintains this periodic sloshing.
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Alejandro Jenkins retweeted
My friend Mark Wise
quantumfrontiers.com/2026/07…
Say what you will about Christopher Nolan's cinematographic output, his middle name ought to be "in medias res". #ArsPoetica
Premiering tonight (Mon. 20 July) on Youtube at 6:00 pm MDT (GMT-6): "The Artifice of Sadi Carnot: Reflections on his 230th anniversary". youtu.be/5KYHT0gMKUo
🤖 Made with AI
"El artificio de Sadi Carnot: Reflexiones sobre sus 230 años" youtu.be/ZzVh6rjYhkA via @YouTube
Este miércoles 8 de julio en la Escuela de Física de la U. de Costa Rica, hablaré sobre "El artificio de Sadi Carnot". La charla estará orientadas a estudiantes de las carreras de física y meteorología.
Alejandro Jenkins retweeted
Did you know you can create the Maxwell-Boltzmann distribution with just some balls and a motor?
I built this simple device to illustrate it.
This is how it works: A spinning agitator pumps energy into ~400 balls, so they bounce around and collide like gas particles in a box.
They escape one at a time through a tiny hole, then fall a fixed gap into bins below. Since the hole is so small, every ball leaves with no vertical speed and takes the same time to fall.
Constant fall time means how far a ball flies sideways is set purely by its speed. A faster ball goes into a further bin. So each bin is really a speed. Tally all 400 and you get the Maxwell-Boltzmann distribution.
"48 países en un Mundial no es serio. Están matando el fútbol".
Yo en el Mundial del 2038 viendo cómo el Vaticano pierde por penales ante la Isla de Epstein en sesentaicuatravos de final.
“He felt himself at last beginning to be a teacher, which is simply a man to whom his book is true, to whom is given a dignity of art that has little to do with his foolishness or weakness or inadequacy as a man.” -John Williams, _Stoner_ (1965)
This is a nice practical illustration of Bertrand's theorem in classical mechanics youtube.com/shorts/0GmMmaavp… via @YouTube
