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.
Joined May 2018
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12 Jul 2023
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
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“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)
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„Nur durch eine fortgehende immer wiederholte Unterbrechung ist Leben möglich.“ -Schlegel
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Valveless pulsejet engine demo youtu.be/RTNCGe88UVM?si=kURi… via @YouTube
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This is a nice practical illustration of Bertrand's theorem in classical mechanics youtube.com/shorts/0GmMmaavp… via @YouTube
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If you look closely, you can compute the thrust from the reading of the weighing scale. #PulseJet youtube.com/shorts/HDILAv_a8… via @YouTube
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My art history research came up this morning at the Royal Society...
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"I sing not, siren-like, to tempt; for I / Am harsh". - Donne
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In this preprint I argue that there's a portrait of a young Isaac Newton hiding in plain sight in the collection of Trinity College, Cambridge. #IsaacNewton #Historyofart arxiv.org/abs/2603.01280
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The curator of collections at Trinity, Pola Durajska, will argue the same at a conference on "Scientific portraits and portraits for science" at the Royal Society on 20 March. royalsociety.org/science-eve…
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Alejandro Jenkins retweeted
"Can we get rid of this ayatollah T-shirt? Khomeini died years ago."
"But, Marge, it works on any ayatollah-- Ayatollah Nakhbadeh, Ayatollah Zahedi. As we speak, Ayatollah Razmara and his cadre of fanatics are consolidating their power."
"I don't care who's consolidating their power."
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Newton's bucket experiment: I'm hoping to turn this into a science toy to rival 'Newton's cradle'. 😃 youtu.be/Tu4oUA_achY?si=a9Rx… via @YouTube
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The simplest valveless pulse-jet engine: A Mason jar with a hole in the lid, with a bit of pure methanol at the bottom as fuel, and immersed in a bath of ice water to keep the heat from causing the jar to break apart. #JetPropulsion #ThermoAcoustic #SelfOscillation
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Richard Trevithick en Costa Rica youtu.be/ZU5hQMy_-CE?si=TKlR… via @YouTube
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I still think of Carlos as a kid who'd aced my thermodynamics course and who'd stop by my office to talk about how the wind raises waves on the sea and the maintenance of the Chandler wobble. He's now a professor at Stanford. 🧐
Hard questions, soft materials | Stanford Doerr School of Sustainability - Carlos Diaz-Marin is assistant professor of energy science and engineering in the Stanford Doerr School of Sustainability. My research interests ... - ift.tt/jCXZvAP
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Thermal self-oscillation! My favorite physical effect. 😄🥶🥵 @chen48721 instagram.com/reel/DT3F2YcDp…
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During World War II, my grandfather single-handedly brought down ten German airplanes. After that the Luftwaffe got rid of him as a mechanic, due to his incompetence.
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Today's 'orthodox' Newtonmas (i.e., Isaac Newton's birthday in the Gregorian calendar). So here are some pictures of Newton's monument in the Trinity College chapel. Note how the sculptor worked to give the marble the visual texture of a wrinkled satin gown. #IsaacNewton
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15 Dec 2025
A thermodynamic cycle for the X-ray corona in a black-hole binary system. Source: arxiv.org/abs/2512.09026
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11 Dec 2025
Hoy a las 4:30 pm en el Auditorio de Físico-Matemáticas (FM-001) de la UCR, intentaré explicar algo que me llevó varios años entender: ¿Cómo está actualmente definido el kilogramo?
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