Quantum Science Seminar #65

Casimir effect meets the cosmological constant

In 1998 astronomers discovered that the expansion of the universe is accelerating. Somehow, something must have made gravity repulsive on cosmological scales. This something was called dark energy; it is described by Einstein’s cosmological constant; and it amounts to about 70% of the total mass of the universe. It has been conjectured that the cosmological constant is a form of vacuum energy, but its prediction from quantum field theory has failed by many orders of magnitude. The lecture shows how a theory informed by empirical evidence on Casimir forces does produce the correct order of magnitude and agrees with astronomical data, and how subtle this is.


[1] Ulf Leonhardt

"The case for a Casimir cosmology

Philosophical Transactions of the Royal Society A 378, 20190229 (2020)

[2] D. Berechya and U. Leonhardt

"Lifshitz cosmology: quantum vacuum and Hubble tension"

Monthly Notices of the Royal Astronomical Society 507, 3473 (2021)

[3] Itai Y. Efrat and Ulf Leonhardt

"Van der Waals anomaly: Analog of dark energy with ultracold atoms"

Physical Review B 104, 235432 (2021)

Hier finden Sie den Link zum Livetalk um 17.00 Uhr (CEST) sowie zu den Aufzeichnungen im Nachhinein:


Hier sehen Sie die Aufzeichnung des letzten Vortrags von Hannes Pichler

Quantum Science Seminar #64 - Hannes Pichler


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