Cosmology

Simulating the future of our Universe

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Science  25 May 2018:
Vol. 360, Issue 6391, pp. 871-872
DOI: 10.1126/science.360.6391.871-g

The energy densities of matter and dark energy in our Universe are approximately equal at the current epoch. Testing whether this is a coincidence requires running cosmological simulations into the future, something that has generally been avoided because only the past can be observed. Salcido et al. simulated the futures of universes with and without dark energy, assessing its impact on the total star formation within each universe. The presence of dark energy has surprisingly little effect, because most stars have formed before it becomes dominant. Eighty-eight percent of all stars that will ever form in our Universe have done so already. The results suggest that the current epoch is not particularly special.

Mon. Not. R. Astron. Soc. 10.1093/mnras/sty879 (2018).

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