Workshop in Cosmology

Challenges to ΛCDM

September 4-7, 2022

Aristotle University of Thessaloniki, 

Thessaloniki, Greece

 Scientific Topic & Scope

Recent observations have triggered discussions among the cosmological community, with potentially pivotal and far reaching implications. The catalyst for the ongoing debate appears to be so far unexplained differences between the early and the late-time measurements of the Hubble constant. Persistent reports of bulk peculiar motions larger and faster than typically anticipated, as well as of anomalous dipolar anisotropies in the number counts of distant radio-sources, have added to the debate. As a result, an increasing number of cosmologists are reconsidering the status of the current cosmological model, the ΛCDM paradigm. In summary, it seems that the time may have come to review some of our long-standing views and perceptions regarding the universe we live in.


The aim of the workshop is to review the status of the standard ΛCDM paradigm, draw attention to open issues that may question its foundations and robustness, as well as to discuss alternatives that could alleviate the tensions and consider the possible future perspectives. The main topics of debate include:

Latest Measurements of Cosmological Parameters

Theoretical and Observational Challenges to ΛCDM

Alternatives to the ΛCDM paradigm

Challenges to the Cosmological Principle

The meeting is organized by the Cosmology Group at the Astronomy Lab of the Aristotle University of Thessaloniki and the venue is in the university campus, near the city center. The event is part of the three-year research project "Tilted Cosmology", funded by the Hellenic Foundation for Research & Innovation.

Registration Closed

Plenary & Keynote Speakers

Timothy Clifton 

Queen Mary College, University of London, UK

Eoin Ó Colgáin 

Sogang University, Korea

Rocky Kolb

University of Chicago, USA

Baojiu Li

Durham University, UK

Roy Maartens

University of Western Cape, SA  &  ICG, University of Portsmouth, UK 

Konstantinos Migkas

University of Bonn, Germany

Leandros Perivolaropoulos

University of Ioannina, Greece

Mohamed Rameez

Tata Institute of Fundamental Research, India

Subir Sarkar

Oxford University, UK

Douglas Scott

University of British Columbia, Canada

Arman Shafieloo 

Korea Astronomy & Space Science Institute

John Webb

Cambridge University, UK

Organizing Committee

Christos Tsagas, Jessica Santiago, Kerkyra Asvesta 

(Aristotle University of Thessaloniki)

George Alestas, Lavrentios Kazantzidis

(University of Ioannina)

Τhe workshop will take place within the campus of the Aristotle University of Thessaloniki near the historic city center. 

All sessions will be held in the lecture theater of the university's Central Library.

                                                                 The registration and the colloquium will take place in the university's Ceremony Hall.

The workshop and the accompanying events are fully funded by the Hellenic Foundation for Research and Innovation, under the three-year research project entitled "Tilted Cosmology".