Ladies and Gentlemen. Due to the coronavirus epidemic in Poland, the CTP PAS is operating in a limited way. In particular, until further notice the secretariat and the accountancy of the CTP PAS will be working only remotely. Contact with the administration is possible only by an e-mail. We are sorry for any inconvenience.

Colloquium details

Name Center for Theoretical Physics Colloquium
Title The Hubble constant tension: cosmological anomaly or systematic errors?
Details

Two currently most competitive methods of measuring the Hubble constant based on observations of the cosmic microwave background radiation and type Ia supernovae yield strongly discrepant results. Since no unaccounted systematic effects have been found so far, there is now a growing conviction that the discrepancy -- dubbed the Hubble constant tension -- signifies an anomaly of the standard cosmological model. In my talk, I will review both observational and theoretical approaches to resolving the Hubble constant tension and understanding its origin. On the observational side, I will demonstrate the potential of several new methods to obtain alternative constraints on the Hubble constant, which will eventually confirm or raise doubts about the cosmological anomaly scenario.
In particular, I will show the first results from two novel techniques deriving the Hubble constant from dedicated observations of gravitational waves and extragalactic gamma rays. In the context of developing alternative methods to measure the Hubble constant, I will talk about ongoing searches of gravitationally lensed supernovae, their motivations and challenges. Finally, on the theoretical side I will make a critical review of possible extensions of the standard cosmological model proposed recently to alleviate the Hubble constant tension.

Time Wednesday, 26 February 2020, at 12:10 CET The seminar was held!
Speaker

Dr Radosław Wojtak  (DARK, Niels Bohr Institute, University of Copenhagen)

Seminar Language English
Organisers Maciej Bilicki; Adam Sawicki; Krzysztof Pawłowski; Julius Serbenta;