initiated by Paul Ehrenfest in 1912
currently organized by Ana Achúcarro & Luca Giomi (read about its history)


Dinner participants: 59 | Follow the live stream

Efstathiou

George Efstathiou

Emeritus Professor of Astrophysics, Kavli Institute for Cosmology

December 11

7:30 p.m.

Sitterzaal

Challenges to the Lambda CDM cosmology

Observations of the cosmic microwave background (CMB) anisotropies provide strong evidence in support of the LCDM cosmology. Nevertheless, a number of 'tensions' have emerged. I will review: (a) recent results from the CMB that have strengthened the evidence in favour of lambda CDM; (b) why it is difficult to explain the discrepancy between the lambda CDM value of the Hubble constant, H0, and the value derived from the Cepheid distance scale; (c) why cosmic shear surveys may indicate a small-scale/large-scale mismatch rather than an inconsistency between early and late time physics; (d) why the recent DESI results suggesting evolving dark energy may be driven by systematic errors; (e) why inflation, a cornerstone of the lambda CDM model, has introduced a new hierarchy problem in cosmology.

The Colloquium Ehrenfestii takes place Wednesday evenings starting at 19:30 hours in the main auditorium of the Oort building. Before the Colloquium, there is a common dinner in the canteen located on the ground floor of the Oort building. This dinner starts at 18:00 hours sharp and is free of charge, under the condition that one attends the colloquium and that one has made a reservation before noon on the Tuesday preceding the colloquium.

We count on your presence if you register, please do show up. Meal registrations may close earlier, when 80 persons have signed up.

Colloquium Ehrenfestii Program 2024

10 Jan

Jay Fineberg (Hebrew University of Jerusalem)

Friction, Earthquakes and Everything in Between

21 Feb

Sera Markoff (Anton Pannekoek Inst., University of Amsterdam)

A tale of two black holes: Sgr A* and M87*

10 Apr

Christopher Fuchs (University of Boston)

Repainting Quantum Mechanics on QBist Canvas

08 May

Cumrun Vafa (Harvard University)

Quantum Gravity and Predictions for our Universe

29 May

William Bialek (Princeton University)

Physics for maggots

25 Sep

Chiara Mariotti (CERN, INFN Turin)

Stairways to heaven: precise measurements and searches at the LHC experiments

16 Oct

Xiao-Gang Wen (MIT)

Origin of light (and other elementary particles) -- a unification of matter and information

06 Nov

Viatcheslav Mukhanov (LMU Munich)

The Quantum Universe

11 Dec

George Efstathiou (Emeritus Professor of Astrophysics, Kavli Institute for Cosmology)

Challenges to the Lambda CDM cosmology

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