July 9, 2020 to January 31, 2025
Europe/Zurich timezone

Cosmological constant problem on the horizon

May 31, 2022, 4:00 PM
1h 20m


Hassan Firouzjahi (IPM, Tehran)


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.

Presentation materials