Dice Question Streamline Icon: https://streamlinehq.com

Cause of present-day cosmic ingredient proportions

Determine why the present-day cosmological density parameters take the observed proportions: dark energy approximately 0.7, dark matter approximately 0.25, baryonic matter approximately 0.05, and radiation approximately 5×10^-5.

Information Square Streamline Icon: https://streamlinehq.com

Background

The paper reviews the standard cosmological composition in terms of density parameters for dark energy, dark matter, baryonic matter, and radiation, listing representative values. It notes that dark energy dominates, followed by dark matter, then baryonic matter, with radiation being smallest.

While the work later proposes a qualitative ordering consistent with observations, the reason for these specific proportions is explicitly stated to be unknown at the outset.

References

That is to say, the proportion of the dark energy is the largest, that of the dark matter is the next, and that of the photons is the smallest. Why their proportions are so remains open.

— A physical mechanism of the generation of stable positive kinetic energy systems and a qualitative explanation of the proportions of the four ingredients in the universe (2402.13263 - Wang, 9 Feb 2024) in Introduction, after Eq. (1)