Posted on December 28, 2018
As Peter Woit, theoretical mathematician of Columbia University, says, string theory is "not even wrong" because it is not falsifiable, the basic principle of all science theory. Now researchers at Uppsala University have developed another "new model" for the Universe based on string theory ̵
Her new article, published in Physical Review Letters, suggests a new structural concept, including dark energy, for a universe that rides on an expanding bubble in an extra dimension.
We have known for 20 years that the universe is spreading faster and faster. The explanation is the "dark energy" that permeates them and forces them to expand. Understanding the nature of this dark energy is one of the most important puzzles of fundamental physics.
It has long been hoped that string theory will provide the answer. According to string theory, all matter consists of tiny, vibrating "threadlike" entities. The theory also requires that there are more spatial dimensions than the three already part of everyday knowledge.
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For 15 years there have been models in string theory that were thought to produce dark energy. However, this has led to more and more severe criticism, and several researchers now claim that none of the previously proposed models is workable.
In their article, the scientists propose a new model in which dark energy and our universe stand on a planet expanding bubble in an additional dimension. The entire universe is housed on the edge of this expanding bubble. All matter in the Universe corresponds to the ends of strings that extend into the extra dimension. The researchers also show that expanding bubbles of this kind can arise in the context of string theory. It is conceivable that there are more bubbles than ours that correspond to other universes.
The model of the Uppsala scientists provides a new, different picture of the origin and future fate of the universe, while possibly also paving the way for methods of string theory testing.
The daily galaxy of Uppsala University
Credit: Suvendu Giri