XII Latin American Symposium on High Energy Physics

An alternative explanation to accelerating Universe without $\Lambda$ in concordance with the last $H_0$ measured value

Not scheduled

2h

Sala SUM, Centenario Building (Sociales) (PUCP)

Poster (Theory) Cosmology Poster Session

Speaker

Joaquin Sureda Hernandez (Pontificia Universidad Catolica de Chile)

Description

We perform an MCMC analysis with the most updated SN-Ia catalog using an alternative cosmological model named Delta Gravity. This model is based on a new Einstein-Hilbert action based on a new symmetry symbolized as $\tilde{\delta}$. This theory predicts an accelerating Universe without the need to introduce a $\Lambda$ by hand in the equations.

The equations of motion that describe the expansion of the universe depend on two free parameters: $L_2$ and $C$ that are found by the MCMC simulation. Using these parameters we predicted cosmological parameters such as the Hubble Constant $H_0$, the age of the universe and the deceleration parameter $q_0$.

The most significant result is that Delta Gravity predicts that $H_0$ is $74.47\pm 1.63$ km/(s Mpc). This value is in concordance with the last measurement of the $H_0$ local value, $73.83\pm 1.48$ km/(s Mpc) (Riess 2018). This result is very important because could be an explanation to the $H_0$ tension today.