Events
The trouble with Hubble, new physics from the cosmological expansion rate?
| Title of the event | The trouble with Hubble, new physics from the cosmological expansion rate? |
| Series | Physik Kolloquium |
| Organizer | Physik Fakultät |
| Speaker | Prof. Dr. Martin Schmaltz |
| Type of event | Kolloquium |
| Category | Forschung |
| Registration required | Nein |
| Details | The expansion rate of our universe, the "Hubble rate", is one of the key observables in big bang Cosmology. It has been measured to a precision of 1.4% and it can be predicted using Einstein's equation in General Relativity. The prediction requires knowledge of the dominant energy densities in the universe. In our Standard (LCDM) Model of the universe these energy densities are ordinary matter, dark matter, and dark energy, and their abundance is well-determined thanks to precision measurements of the Cosmic Microwave Background radiation and the large scale distribution of matter. The "trouble with Hubble" is that the state of the art prediction disagrees with observations at the 5 sigma level. In this colloquium, we will review the two disagreeing determinations of the Hubble rate and conclude that a fundamental change of the LCDM model may be required. I will speculate that the evidence points towards an undetected dark radiation component in our universe. |
| Date | Start: 11.12.2023, 16:30 Uhr Ende: 11.12.2023 , 17:30 Uhr |
| Location |
Fakultät für Physik (Friedrich-Hund-Platz 1) Hoersaal 2 - A00.102 |
| Contact |
0551-3926949 Laura.Covi@theorie.physik.uni-goettingen.de |