Synopsis: Universe Preceded by an Antiuniverse?

December 20, 2018

A brand new cosmology mannequin means that our Universe has a mirror picture within the type of an “antiuniverse” that existed earlier than the large bang.

Synopsis figure

L. Boyle/Perimeter Institute for Theoretical Physics

From a sure vantage level, our Universe appears to be like lopsided. Time runs ahead as house expands, and there’s extra matter than antimatter. This appears to violate a basic symmetry, referred to as CPT symmetry, that claims physics is unchanged when time, house, and matter-antimatter are all flipped. To steadiness out the cosmos, Latham Boyle, Kieran Finn, and Neil Turok from the Perimeter Institute for Theoretical Physics in Canada suggest that the large bang was additionally the place to begin of an antiuniverse, the place time runs in the other way and antimatter dominates. They present that such a CPT-symmetric mannequin will not be solely per the recognized cosmic growth historical past but additionally supplies a simple rationalization for darkish matter.

The CPT-symmetric mannequin is an alternative choice to inflation, which assumes that the Universe went via a quick epoch of exponential progress proper after the large bang. This fast growth can clarify sure cosmological observations, nevertheless it requires the existence of extra, nonetheless hypothetical quantum fields. Boyle and colleagues present that their proposal can clarify early cosmic evolution with out inventing new physics. Within the CPT-symmetric mannequin, time and house circulation repeatedly throughout the large bang, and the antiuniverse that emerges within the detrimental time course behaves like a mirror reflection of our Universe.

The crew has but to indicate whether or not this mannequin can reproduce sure observations that the inflation situation explains—such because the uniformity of the cosmos on giant scales. Nonetheless, the brand new mannequin provides a pure rationalization for darkish matter: a CPT-symmetric Universe would produce giant numbers of very huge sterile neutrinos. Such superheavy neutrinos may also be the supply of lately noticed high-energy cosmic-ray showers (see 18 October 2018 Synopsis).

This analysis is revealed in Bodily Evaluation Letters.

–Michael Schirber

Michael Schirber is a Corresponding Editor for Physics primarily based in Lyon, France.


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