The effect of dark matter and dark energy interactions on the peculiar velocity field and the kinetic Sunyaev-Zel'dovich effect

Abstract

The interaction between Dark Matter and Dark Energy has been proposed as a mechanism to alleviate the coincidence problem. We analyze its effects on the evolution of the gravitational and the peculiar velocity fields. We find that for different model parameters peculiar velocities vary from a factor five times smaller to two times larger than in the ΛCDM cosmological model at the same scales. We propose two new observables sensitive to such interactions based on their effect on the velocity field. We compare the effects on peculiar velocities with those on the Integrated Sachs-Wolfe effect demonstrating that velocities are more sensitive to the interaction. We show that the current upper limits on the amplitude of the kinetic Sunyaev-Zel'dovich power spectrum of temperature anisotropies provide constraints on the coupling within the dark sectors that are consistent with those obtained previously from the Cosmic Microwave Background and galaxy clusters. In particular, we show that Atacama Cosmology Telescope and South Pole Telescope data favor the decay of Dark Energy into Dark Matter, as required to solve the coincidence problem. PACS numbers: 98.80.Es, 98.80.Bp, 98.80.Jk

New constraints on interacting dark energy from cosmic chronometers

“…Hence, many different scenarios of interacting dark energy have been constructed (see [7,8] for reviews and references therein). Interestingly enough, recently it has been shown that the current data might favor the late-time interaction between CDM and the vacuum energy [9][10][11][12] or the dynamical dark energy sector [13][14][15][16][17][18][19][20][21][22][23].…”

Early dark energy and its interaction with dark matter

“…We plot the evolution of the DE fractional energy density in that energy flows from DE to DM [21][22][23][24][25]. For the same amount of DE today, with the positive coupling, it implies that DE density was higher in the past.…”

“…A more natural understanding, in the framework of field theory, 3 is to consider that there is some kind of interaction between them. It has been shown that the interaction between DM and DE is allowed by astronomical observations and can help to alleviate the coincidence problem, see for example [21][22][23][24][25] and references therein. It would be of great interest to extend the previous studies to the interaction between EDE and DM.…”

Interacting Ricci-like holographic dark energy

“…It is noteworthy to mention that they obtain slightly negative interaction in some cases. In [31] the authors contrast dark sector interactions with three different observables show a relation between the sign and amplitude of the interaction with the amplitude of the kSZ effect. They also mention that future experiments might provide the first detection of interaction in the dark sector.…”