** Estimate measures information encoded in particles, opens door to practical experiments.**

Researchers have long suspected a connection between information and the physical universe, with various paradoxes and thought experiments used to explore how or why information could be encoded in physical matter. The digital age propelled this field of study, suggesting that solving these research questions could have tangible applications across multiple branches of physics and computing.

In *AIP Advances*, from AIP Publishing, a University of PortsmouthEstablished in 1992, the University of Portsmouth is a public university in the city of Portsmouth, Hampshire, England. Prior to reaching university status, the school was known as Portsmouth Polytechnic from 1969 until 1992 and can trace its history back to 1870 as the Portsmouth and Gosport School of Science and Art.”>University of Portsmouth researcher attempts to shed light on exactly how much of this information is out there and presents a numerical estimate for the amount of encoded information in all the visible matter in the universe — approximately 6 times 10 to the power of 80 bits of information. While not the first estimate of its kind, this study’s approach relies on information theory.

“The information capacity of the universe has been a topic of debate for over half a century,” said author Melvin M. Vopson. “There have been various attempts to estimate the information content of the universe, but in this paper, I describe a unique approach that additionally postulates how much information could be compressed into a single elementary particle.”

To produce the estimate, the author used Shannon’s information theory to quantify the amount of information encoded in each elementary particle in the observable universe as 1.509 bits of information. Mathematician Claude Shannon, called the Father of the Digital Age because of his work in information theory, defined this method for quantifying information in 1948.

“It is the first time this approach has been taken in measuring the information content of the universe, and it provides a clear numerical prediction,” said Vopson. “Even if not entirely accurate, the numerical prediction offers a potential avenue toward experimental testing.”

Recent research sheds light on the ways information and physics interact, such as how information exits a black holeA black hole is a place in space where the pull of gravity is so strong not even light can escape it. Astronomers classify black holes into three categories by size: miniature, stellar, and supermassive black holes. Miniature black holes could have a mass smaller than our Sun and supermassive black holes could have a mass equivalent to billions of our Sun.”>black hole. However, the precise physical significance of information remains elusive, but multiple radical theories contend information is physical and can be measured.

In previous studies, Vopson postulated information is a fifth state of matter alongside solid, liquid, gas, and plasmaPlasma is one of the four fundamental states of matter, along with solid, liquid, and gas. It is an ionized gas consisting of positive ions and free electrons. It was first described by chemist Irving Langmuir in the 1920s.”>plasma, and that elusive dark matter could be information. Vopson’s study also included derivation of a formula that reproduces accurately the well-known Eddington number, the total number of protons in the observable universe.

While the approach in this study ignored antiparticles and neutrinos and made certain assumptions about information transfer and storage, it offers a unique tool for estimating the information content per elementary particle. Practical experiments can now be used to test and refine these predictions, including research to prove or disprove the hypothesis that information is the fifth state of matter in the universe.

Reference: “Estimation of the information contained in the visible matter of the universe” by Melvin M. Vopson, 19 October 2021, *AIP Advances*.

DOI: 10.1063/5.0064475

Source: SciTechDaily