Copernicus Webinar and Colloquium Series

Europe/Zurich
Description

(*Please take note of the unusual starting hour*)

To promote scientific discussions during this pandemic, we are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.

We would like to invite you to take part in the upcoming 95th Copernicus Webinars.

Time:                 31st May, Tuesday, 4:00 pm CEST (10 pm Beijing time, 11 pm JST, 10 am EDT)

Speaker:            Hassan Firouzjahi (IPM, Tehran)

Title: Cosmological constant problem on the horizon

Abstract:

We revisit the quantum cosmological constant problem and highlight the important roles played by the dS horizon of zero-point energy. We argue that fields which are light enough to have dS horizons of zero-point energy comparable to the FLRW Hubble radius are the main contributors to dark energy.  On the other hand, the zero-point energy of heavy fields develop strong nonlinearities on sub-Hubble scales and can not contribute to dark energy. We speculate how this proposal can solve the old and new cosmological constant problems. We further speculate if the zero-point energy of heavy fields can provide the seeds of dark matter.

Zoom link:

https://zoom.us/j/4214801692?pwd=TGxVWHJudnI1S25FbXhERlVDMkN0dz09

Meeting ID: 421 480 1692

Passcode: cosmology