Colloquium Schedule

Colloquium: Thursday, April 22nd, 2:25 PM, Via Zoom

"The Hubble Tension and the Magnetic Universe" - Dr. Levon PogosianSimon Fraser University

Magnetic fields are ubiquitous in the universe, observed essentially in all astrophysical environments. There are good reasons to believe that their origin traces back to the events in the very early universe, such as the electroweak phase transition or Inflation. As I will describe in this talk, accounting for the presence of magnetic fields in the primordial plasma can help resolve a major puzzle of modern cosmology -- the so-called Hubble tension. The latter refers to the disagreement between the value of the Hubble constant, or the current expansion rate of the universe, measured directly using supernovae type Ia and the value predicted by the cosmological model that best fits the cosmic microwave background. Intriguingly, we find that the strength of the magnetic field required to alleviate the Hubble tension is of the right order to also explain the observed magnetic fields in galaxies, clusters of galaxies and the intergalactic space. Our findings motivate further detailed studies of primordial magnetic fields, setting several well-defined targets for future observations.

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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:25 PM via Zoom.If you would like to attend from outside Lehigh,  please contact Prof.  B. Roy ( for the passcode to the meeting


Physics Colloquium Schedule for Fall 2020

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

February 4Thomas CocoliosCatholic University of Leuven BelgiumThe ISOLDE facility at CERN
February 11Gary ShiuUniversity of Wisconsin - MadisonThe Topology of Data: from String Theory to Cosmology to Phases of Matter
February 18Colin ParkerGeorgia TechSpin Susceptibility Above the Superfluid Onset in Ultracold Fermi Gases
February 25Adolfo GrushinNeel Institute, Grenoble, FranceAmorphous Topological Insulators in Theory and Experiment
March 4Shashank ShekharEmory University Self-assembly of the Cellular Skeleton, One Molecule at a Time
March 11Emil BergholzStockholm UniversityExceptional Topology of Non-Hermitian Systems
March 18March Meeting-No Colloquium
March 25Sina NajmaeiUS Army Research Lab2D Semiconductors for Future Electronic Device Applications
April 1Karl LansteinerInstitute of Theoretical Physics (IFT), Madrid, SpainQuantum Anomalies in Matter
April 8Gregory HarmsWilkes UniversityBiophysics and Bioengineering of BMPs: from Molecule to Organism
April 15Leah KeshetUniversity of British ColumbiaMathematical and Computational Models for Cell Migration and Internal Signaling Dynamics
April 22Levon PogosianSimon Fraser UniversityThe Hubble Tension and the Magnetic Universe
April 29David SinghUniversity of Missouri Thermoelectrics: Contraindication and its Resolution
May 6---