It's possible that spacetime expansion oscilates: https://www.researchgate.net/publication/330726290_Confirmation_of_Inflaton-like_Oscillations_in_the_Scale_Fa

It's possible that spacetime expansion oscilates: https://www.researchgate.net/publication/330726290_Confirmation_of_Inflaton-like_Oscillations_in_the_Scale_Factor_from_the_Pantheon_Compilation_of_1048_SNe1a https://www.researchgate.net/publication/330726290_Confirmat... Main frequency is around 7 times per age of the Universe. Secondary one is around 10.5 times. When I look at it, I think that dark energy is just ultra strong low frequency gravity wave coming from rotating ultramassive objects far outside of our observable universe and way older than our little local shenanigans we call Big Bang.