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Supercomputer Turns Back Cosmic Clock for Insights Into One of the Most Important Mysteries in Modern Astronomy - SciTechDaily
Feb 17, 2021 1 min, 21 secs
The “reconstruction method” winds back the evolution from right to left on this illustration to reproduce the primordial density fluctuations from the current galaxy distribution.

They found that together with new observations the method can set better constraints on inflation, one of the most enigmatic events in the history of the Universe.

The method can shorten the observation time required to distinguish between various inflation theories.

Inflation should have created primordial density fluctuations which would have affected the distribution of where galaxies developed.

(1) The simulations start from a galaxy distribution based on primordial density fluctuations and (2) performs gravitational many-body calculations to evolve to the current galaxy distribution.

(3) Then the reconstruction method is used to work backwards to the earlier galaxy distribution.

However, processes other than inflation also impact galaxy distribution, making it difficult to derive information about inflation directly from observations of the large-scale structure of the Universe, the cosmic web comprised of countless galaxies.

In particular, the gravitationally driven growth of groups of galaxies can obscure the primordial density fluctuations.

They then applied this method to see how well it reconstructed the starting state of the simulations.

The team found that their method can correct for the gravitational effects and improve the constraints on primordial density fluctuations.

“Using this method, we can verify of the inflation theories with roughly one tenth the amount of data.

This method can shorten the required observing time in upcoming galaxy survey missions such as SuMIRe by NAOJ’s Subaru Telescope.”.

Reference: “Constraining primordial non-Gaussianity with postreconstructed galaxy bispectrum in redshift space” by Masato Shirasaki, Naonori S.

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