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by Naman Kumar
, Phys.org
An outline of a universe-antiuniverse pair. Credit score: Wikipedia, CC
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An outline of a universe-antiuniverse pair. Credit score: Wikipedia, CC
The accelerated growth of the current universe, believed to be pushed by a mysterious darkish power, is likely one of the biggest puzzles in our understanding of the cosmos. The usual mannequin of cosmology known as Lambda-CDM, explains this growth as a cosmological fixed in Einstein’s subject equations. Nevertheless, the cosmological fixed itself lacks a whole theoretical understanding, significantly concerning its very small optimistic worth.
To elucidate the accelerated growth, physicists have proposed various explanations similar to quintessence and modified gravity theories, together with scalar-tensor-vector gravity. Moreover, explanations past 4 dimensions, just like the braneworld eventualities within the Dvali-Gabadadze-Porrati (DGP) mannequin, modify gravity at massive distances because of the impact of a higher-dimensional bulk on our four-dimensional brane, and variable brane rigidity.
My new mannequin
In my work, I suggest one other mannequin to clarify the current accelerated growth of the universe. In contrast to current fashions, this doesn’t require any type of darkish power or modified gravity approaches. Nevertheless, there’s a worth to pay: we’d like a accomplice anti-universe whose time circulation is oppositely associated to our universe.
There are sturdy arguments supporting this idea. From a quantum concept perspective, it’s pure for the universe to be created in pairs. Lately, Boyle et al proposed that the universe doesn’t spontaneously violate CPT (Cost, Parity, and Time reversal symmetry), however quite, the universe after the Massive Bang is the CPT picture of the universe earlier than it, pointing in the direction of a accomplice anti-universe.
Current outcomes
In a latest paper revealed in Gravitation and Cosmology, I used key ideas from quantum concept, similar to relative entropy, and from basic relativity, such because the null power situation, which corresponds to the optimistic power situation. My findings counsel that the universe naturally expands in an accelerated method.
Relative entropy, which requires two states, on this case, corresponds to the universe and its accomplice anti-universe. Accelerated growth appears inevitable in a universe created in pairs that respect the null power situation. This result’s fairly stunning and readers accustomed to Hawking’s space theorem could discover some similarities. The realm theorem additionally offers with causal horizons and requires the null power situation to carry.
In our mannequin, the causal horizon corresponds to the Massive Bang. The outcomes apply equally to the accomplice anti-universe.
To sum up, the accelerated growth of the universe is a difficult topic that continues to drive scientific efforts. Constructing on current theories, my mannequin affords a proof utilizing customary ideas from quantum concept and basic relativity, with out the necessity for elusive darkish power.
The outcomes point out that accelerated growth is pure for a universe created in pairs. Furthermore, learning causal horizons can deepen our understanding of the universe. The fantastic thing about this concept lies in its simplicity and naturalness, setting it aside from current explanations.
This story is a part of Science X Dialog, the place researchers can report findings from their revealed analysis articles. Go to this web page for details about Science X Dialog and the best way to take part.
Extra data:
Naman Kumar, On the Accelerated Growth of the Universe, Gravitation and Cosmology (2024). DOI: 10.1134/S0202289324010080
Naman Kumar is at the moment a Ph.D. pupil on the Indian Institute of Know-how, Gandhinagar, India. Kumar’s areas of curiosity embrace basic relativity, cosmology, braneworld, and spacetime thermodynamics.