The thermodynamics of a black hole
Hogan designed a holometer (holographic interferometer) to detect any holographic noise. This noise is the quantum behaviour in space-time, and the detection of it would mean that information is in fact projected from a lower dimensional boundary (Fermilab, 2019). The holometer can be thought of a powerful microphone that tries to ‘hear’ certain vibrations at a minute level. It uses a series of laser interferometers which are positioned close together. Light from the different lasers will merge, and if the light does not travel in a steady path, which implies motion or fluctuations, then this will be observed and will correlate to the background noise of this holographic universe. The preliminary results were unsuccessful, and after several years the detector has still not observed any fluctuations. While this experiment certainly does not support this solution to the information paradox, experiments conducted in 2016 at the University of Southampton contradict these sets of results (Southhampton, 2017). Researchers concluded that, after investigating irregularities in the CMBR, the universe could be holographic. The radiation in the CMBR is incredibly intense and its complex structure revealed odd behaviours at the beginning of the universe. These irregularities can be explained by a holographic model, which is compatible with the current model of cosmology. Thinking about the image below, the beginning models of the universe seem very fuzzy. This blurriness stems from space and time not merging yet, which cause the radiation left over to have some odd properties. These irregularities are not consistent with our current model of physics, but by employing a Holographic model, these irregularities would be perfectly compatible (PhysicsBuzz, 2019). Diagram of holometer ( Kwon, 2019)
Timeline of Holographic universe (EurekAlert, 2017)
Previously I mentioned that string theory is required for the information paradox to be resolved. Therefore, if string theory were disproved, a holographic universe would simply not be possible within the scope of it. Due to its popularity, there were many experiments performed to test string theory, but the search was fruitless. None of the particles proposed by supersymmetric string theory has been detected by the Large Hadron Collider, such as the selecton (Scienceblog, 2013). While string theory has never been directly disproven but countlessly altered, many physicists still support it, creating a divide in the scientific community (Din, 2021).
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