Timescape

From previous blogs, my readers know that both Dark Matter and Energy are needed to fit data to the standard cold dark matter (⁠ΛCDM) cosmology.

Very unsatisfactory. Only about 5% of the universe consists of matter known to us.

Dark matter pulls things together, forming galaxies, while dark energy is necessary to explain the accelerated speed with which our universe expands.

As the MOdified Newtonian Dynamics (MOND) model eliminates Dark Matter, the Timescape model does away with Dark Energy.

The mathematics for both models looks complicated.

The Timescape model is based on evidence from cosmological data showing that mass in the universe is not as continuously distributed as presumed in ΛCDM but instead structured. There are voids with regular time scales and clusters of matter where clocks, according to the General Relativity Theory, run slower.

The results rely on data from a supernova database.

  

The data were analyzed and plotted against the minimum redshift cutoffs for the observed supernovae.

Overall, Timescape (blue area) fits the data better than ΛCDM (red area). However, the authors stress the need for further analysis on how the redshift distribution of supernovae and the probed redshift range impact evidence for cosmological models.

No reason for astrophysicists (not astronomers) to cheat,
but they should still be allowed to look

So, as in the case of MOND, the data are not conclusive enough to write a new “standard” cosmology model, but cracks in ΛCDM are getting wider.

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