Home Cosmology Null test for interactions in the dark sector. (arXiv:1812.02333v1 )

Null test for interactions in the dark sector. (arXiv:1812.02333v1 [astro-ph.CO])

[ad_1]

Authors: Rodrigo von Marttens, Valerio Marra, Luciano Casarini, J. E. Gonzalez, Jailson Alcaniz

Since there is no known symmetry in Nature that prevents a non-minimal
coupling between the dark energy (DE) and cold dark matter (CDM) components,
such a possibility constitutes an alternative to standard cosmology, with its
theoretical and observational consequences being of great interest. In this
paper we propose a new null test on the standard evolution of the dark sector
based on the time dependence of the ratio between the CDM and DE energy
densities which, in the standard $Lambda$CDM scenario, scales necessarily as
$a^{-3}$. We use the latest measurements of type Ia supernovae, cosmic
chronometers and angular baryonic acoustic oscillations to reconstruct the
expansion history using model-independent Machine Learning techniques, namely,
the Linear Model formalism and Gaussian Processes. We find that while the
standard evolution is consistent with the data at $3sigma$ level, some
deviations from the $Lambda$CDM model are found at low redshifts, which may be
associated with the current tension between local and global determinations of
$H_0$.

[ad_2]

Source link

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Enter Captcha Here : *

Reload Image

Must Read

Why everyone is talking about energy storage | MNN

Ever since governments started getting serious about developing renewable energy, naysayers have been arguing that it's a pipe dream — after all, the...

Give charities free ad space on your smartphone’s lock screen with Screen Donor

This app gives free ad space to deserving charities and NGOs on one of our tech-centric culture's most commonly seen screens - our...

Tropicana 100% Juice 3-Flavor Fruit Blend Variety Pack, 10 Fl Oz, Bottles, (Pack of 24)

Price: (as of - Details) Now you can enjoy the refreshing taste of Tropicana’s Fruit Medley, Pineapple Peach Mango and Strawberry Orange Juice...

Cell phones and screens are keeping your kid awake

For children and teens, using cell phones, tablets and computers at night is associated with losing sleep time and sleep quality, new research...
Support