Use holograms to illuminate de-setter space

Draw the concept of de Sitter’s conformational field theory. Credit: Kyoto Uinversity / Tadashi Takayanagi

Our understanding of the universe may not expand as much as the universe itself. In some cases, our theories about cosmic inflation may feel like they’re shrinking into a black hole.

However, black holes may be the exact measurement needed to mathematically approximate the expansion of the universe. This may require some thinking outside the box, or in this case, under a microscope.

Now emerging from Kyoto University’s Yukawa Institute for Theoretical Physics is a new approach that uses the principle of holography to describe the expanding universe in de Sitter space, an approximation of our current universe.

Holograms may conjure up images of interstellar video calls in science fiction films, but for theoretical physicists, they can also be microscopic mathematical models that encode higher-dimensional information on lower-dimensional surfaces. With black holes full of entropy, scientists assume that the information encoded in the event horizon is proportional to surface area, not volume as in Euclidean geometry.

“To better understand the events after the Big Bang, we need a consistent theory of quantum gravity, and the de Sitter universe provides a solution to Einstein’s equation of general relativity with a positive cosmological constant,” says author Tadashi Takayanagi.

This model, which excludes gravity, describes a 2D framework that approximates the expansion of our 3D universe, enabling the authors to define the first example of a 2D conformal field theory, or CFT, that typically uses a positive integer for the cosmological constant.

“A special feature of our proposed model is the use of a negative cosmological constant to calculate gravity in anti-de-sitter space,” Takayanagi adds, highlighting the importance of the de-sitter gravity holographic principle. ”

While de Sitter space holography was first proposed in 1997, the resulting results from the computational model showed that the fundamental quantities agreed between classical Einstein gravity and the CFT.

The author concludes, “Quantum information theory has played a fundamental role in black hole physics, raising expectations for a deeper understanding of the space-time structure in the higher-dimensional universe.”

The study was published in physical review messages.

The ‘saddle-shaped’ universe could undermine general relativity

more information:
Yasuaki Hikida et al, Holography in de Sitter Space via Chern-Simons Gauge Theory, physical review messages (2022). 10.1103/ PhysRevLett.129.011604

Presented by Kyoto University

the quote: Using holograms to illuminate de Sitter space (2022, July 20) Retrieved July 21, 2022 from

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