Speaker
Mariana Jaber Bravo
(CFT Polish Academy of Sciences)
Description
We consider a phenomenological model of dark matter with an equation-of-state that is negative and changing at late times. We show that this couples the $H_{0}$ and $\sigma_8$ tensions, providing an explanation for both simultaneously, while also providing an explanation for the anomalously large integrated Sachs-Wolfe (ISW) effect from cosmic voids. Observations of high ISW from cosmic voids may therefore be evidence that dark matter plays a significant role in the $H_{0}$ and$\sigma_8$ tensions. We predict the ISW from cosmic voids to be a factor of $\sim2$ greater in this model than what is expected from the standard model $\Lambda$CDM.
Primary authors
Dr
Krishna Naidoo
(Department of Physics & Astronomy, University College London)
Mariana Jaber Bravo
(CFT Polish Academy of Sciences)
Co-authors
Maciej Bilicki
(Center for Theoretical Physics, Polish Academy of Sciences)
Wojciech Hellwing
(Center for Theoretical Physics PAS)
