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Supernova observations helping understand general relativity

Observations of the stars provide us a lot of information regarding the dynamic of our Universe. And in particular, Supernovae are a very interesting subject to start with to understand what is happening.  Progressively, stellar objects reveal to us the mysteries of the Cosmos.  As Nassim Haramein is explaining for many years now, a logical and intuitive theory is that after an initial phase of expansion, our Universe reached a dynamic steady state in which everything is rotation around the center of the Universe, most probably a huge black hole.

Recent research just confirms this theory that accelerating expansion of the Universe may not be real, but could just be an apparent effect of the rotating galaxies moving in different directions. The new study published in the journal Monthly Notices of the Royal Astronomical Society by a group at the University of Canterbury in Christchurch, New Zealand, proposed a model based on the data from Type Ia supernovae. Doing so, they model our universe with no dark energy and find their result to be fitting the data very slightly better than the standard dark energy model do. Dark energy is usually assumed to form roughly 70% of the present material content of the Universe. However, this mysterious quantity is essentially a place-holder for unknown physics.

The remnant of a type 1a supernova that exploded in the year 1006.

Current models of the Universe require this dark energy term to explain the observed acceleration in the rate at which the Universe is expanding. However, just how statistically significant this signature of cosmic acceleration is at least very controversial. In fact, Friedmann's equation assumes an expansion identical with a very simplistic structure. However, the present Universe actually contains a complex cosmic web of galaxy clusters in sheets and filaments that surround and thread vast empty voids.

"The past debate missed an essential point; if dark energy does not exist then a likely alternative is that the average expansion law does not follow Friedmann's equation."

Prof David Wiltshire, Department of Physics & Astronomy, University of Canterbury, New Zealand

This new study proposes an alternative way to the standard Friedmann–Lemaître–Robertson–Walker (FLRW) model, which fixes spatial curvature to be homogeneous. By comparing the fit of supernova data in ΛCDM to a different model, called the 'timescape cosmology', it proves that supernova dynamic can be explained with no consideration of dark energy or dark matter. However, this debate is far away from being closed. Deciding that not only requires more data, but also better understanding properties of supernovae which currently limit the precision with which they can be used to measure distances.

Continue reading at: https://phys.org/news/2017-09-supernova-analysis-reframes-dark-energy.html

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