The most generally acknowledged theory of the universe is grounded on the idea that the world initiated with a big bang, and has been expanding since. But, in a deep-seated new vision, the Universe in not growing according to a Christof Wetterich, a theoretic physicist at the University of Heidelberg in Germany who has formulated a diverse cosmology in which the Universe is not expanding but postulates that the mass of everything has been growing. His notion might help physicists to comprehend problematic concerns for example the so-called singularity existing at the Big Bang. In his published paper: A Universe without Expansion, Wettrich debates a cosmological model "where the universe contracts rather than expands during the radiation and matter dominated periods". In his paper issued on thearXiv preprint server, he inscribes: "Only dimensionless ratios as the distance between galaxies divided by the atom radius are observable. The cosmological increase of this ratio can also be attributed to shrinking atoms."
|Image Credit: Marijn Franx (University of Groningen), Garth Illingworth (University of California, ), and NASA/ESA|
Cosmologists visualize the Universe as expanding, says Niayesh Afshordi. Niayesh Afshordi is an astrophysicist at the Perimeter Institute in Waterloo, Canada. Cosmologists visualize the Universe as expanding only because it is the most suitable explanation of galaxies' redshift.
In early 1920s, astrophysicists counting Georges Lemaître and Edwin Hubble studied the light produced or absorbed by atoms, which acted in a spectrum of characteristic colors, or frequencies. When matter moved away, they find that galaxies showed a shift to the red, which is lower frequency portion of the spectrum. Afterwards noticing that most galaxies display a red shift that converted greater for further distant galaxies, they speculated that the universe was expanding. Above Hubble image displays a gravitationally lensed image of the maximum known redshift galaxy.
Though, Wetterich highlights that this light produced by atoms is also determined by masses of the elementary particles, and to be precise, their electrons. If the mass of an atom rises, it produces more energetic photons. If the particles were to convert lighter, frequencies would become red shifted. In Wetterich's alternate understanding of redshift all of cosmology looks very altered: The Universe still inflates speedily through a short-lived period acknowledged as inflation. But prior to inflation the Big Bang no longer holds a 'singularity' where the density of the Universe would be immeasurable. In its place, the Big Bang stretches out in the past in excess of a basically infinite period of time. He adds “The current cosmos could be static or even beginning to contract,” But, reports Nature.com, the one giant problem with Wetterich's concept is that it can't be verified. Mass is what’s recognized as a dimensional quantity, and can be measured only relative to something else. For example, each mass on Earth is eventually determined relative to a kilogram standard that assembles in a cellar on the borders of Paris, at the International Bureau of Weights and Measures. If the mass of everything, including the official kilogram, has been rising equivalently over time, there might be no way to find out.
Wetterich states that his understanding might be useful for thinking about different cosmological models, in the similar way that physicists use various understandings of quantum mechanics that are all mathematically reliable. Especially, Wetterich says, the absence of a Big Bang singularity is a chief advantage.