Scientists propose quantum gravity to explain birth of the universe

Pesquisadores led by Niayesh Afshordi, of Universidade of Waterloo, presented a new theory that could solve one of the greatest mysteries in physics: what happened in the first moments of Big Bang. The proposal, called Gravidade Quântica Quadrática, challenges the general relativity of Einstein by suggesting that gravity, when extended to extremely high energies, can explain the birth of the cosmos without the need for infinite singularities.

General relativity, developed more than a century ago, works perfectly in many situations. But it fails miserably when applied to Big Bang. Naquele moment, the theory predicts impossible conditions: infinite density, curvature and temperature. Segundo Afshordi, this indicates that Einstein left something out of his equation.

The incompleteness of classical gravity

The traditional Big Bang theory starts with the gravity of Einstein and then adds extra ingredients, mainly a hypothetical “inflation field”, to explain the initial rapid expansion of the universe. It’s like patching a hole in an inadequate theory.

The team’s work asks whether some of this behavior could come directly from gravity itself, once it is extended to work at extremely high energies. Instead of treating Big Bang as a point where the equations fail, researchers study a theory in which gravity already contains the necessary ingredients to describe this ultra-primordial phase consistently.

Afshordi explained the concept of “ultraviolet completeness”: a theory that remains complete and self-consistent even at arbitrarily high energies. The team’s proposed extension recovers a model of early cosmic inflation while potentially eliminating the problematic concept of an early singularity.

Como the theory works

Gravidade Quântica Quadrática fundamentally redefines how we understand the force that governs the cosmos on its smallest scales. The theory fits current observational data very well, in some cases better than many standard inflationary models.

What surprised the researchers most was how naturally an inflation-like phase emerged once the theory was treated in a consistent high-energy context. Normalmente, scientists think of inflation as something that needs to be added to gravity. Aqui, it arises naturally from gravity itself.

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• Gravidade Quântica Quadrática maintains consistency at arbitrarily high energies
• Recupera early cosmic inflation model without singularities
• Fits well with current observational data
• Reduz need for additional assumptions about the early universe
• Oferece more elegant approach to the problem of cosmic origins

Testes observations in the future

The team’s next step is to improve the model’s observational predictions and carefully compare them with future data. The research follows two main directions: theoretical and observational.

On the theoretical front, researchers want to understand the structure of quantum gravity more fully and test the robustness of the conclusions beyond the simplified scenario they studied. In observational terms, they need to make clearer predictions for primordial gravitational waves and other traces of the early universe.

The observational evidence that could confirm the team’s theory will come from some of the oldest observable signals in the universe. Pequenas ripples in spacetime, called primordial gravitational waves, carry direct information about Big Bang. Important Igualmente are the subtle marks in the cosmic microwave background, a cosmic fossil that represents the universe’s first light left over from when the cosmos was just 380,000 years old.

Why does this matter

Para physicists, proving the concept of quantum gravity is equivalent to Santo Graal. Preencheria the gap between our explanation of the universe on vast cosmic scales, governed by general relativity, and on tiny scales, governed by quantum physics. Durante For decades, scientists have sought a unified theory that works on both ends.

Afshordi highlighted that if future observations detect the correct pattern of primordial gravitational waves or other distinguishing marks in the cosmic microwave background, it will provide a way to test whether this picture of the early universe is correct. Caso otherwise, a more conventional explanation may be necessary.

The research represents a relatively minimal extension of the Einstein theory, but one with the potential to contribute significantly to resolving the deep problem of our cosmic origins. The scientific community is following the next steps of this investigation with interest.