Seminars and Colloquia

Is the universe 26.7 Billion years old with no dark matter or dark energy?Astrophysics Seminar

by Rajendra Gupta (university of Ottawa)

Asia/Kolkata
Auditorium

Auditorium

Description

Abstract

I will discuss a new model that resolves the 'impossible early galaxy' problem while complying with supernovae type 1a and baryonic acoustic oscillations data. The problem was noticed in some Hubble Space Telescope observations and confirmed by the James Webb Space Telescope's cosmic dawn observations. The model is a hybrid of two ideas from the first half of the last century: a) Zwicky's tired light and b) Dirac's varying coupling constants. The existence of tired light (TL) reduces the redshift contribution from the expanding Universe, which increases the age of the Universe to 26.7 billion years. Covarying coupling constants (CCC) eliminate the need for the cosmological constant, hence the dark energy. The critical density in the CCC+TL model is only adequate for observable (baryonic) matter with no room for dark matter or dark energy. The accelerated expansion of the Universe is caused by the weakening of the coupling constants rather than by dark energy. I'll present our latest findings, including the model's success in predicting the baryonic content of galaxies from their observed rotation curves. The research had extensive media coverage earlier this year and last year.