Is it possible to find out if we are living in a computer simulation?
A British philosopher, Nick Bostrom, hypothesized that we might in fact be living in a computer simulation being run by our descendants in the future. Bostrom, a philosophy professor at the University of Oxford, published a paper in Philosophical Quarterly in 2003 arguing that one of three possibilities is true:
1) The human species is likely to go extinct before reaching a “posthuman” stage.
2) Any posthuman civilization is very unlikely to run a significant number of simulations of its evolutionary history.
3) We are almost certainly living in a computer simulation.
Bostrom also said, "The belief that there is a significant chance that we will one day become posthumans who run ancestor simulations is false, unless we are currently living in a simulation."
Now, a team of physicists at the University of Washington has created a potential test to see if we are indeed living in a computer simulation. However, it will be decades before technology reaches the point where even primitive simulations of the universe are viable. The UW team has theorized tests, however, that can be performed now or in the near future that would be sensitive to constraints imposed by the limited resources and technological abilities of such primitive simulations.
The conical (red) surface shows the relationship between energy and momentum in special relativity, a fundamental theory concerning space and time developed by Albert Einstein, and is the expected result if our universe is not a simulation. The flat (blue) surface illustrates the relationship between energy and momentum that would be expected if the universe is a simulation with an underlying cubic lattice.
Martin Savage, UW physics professor, says that current supercomputers can simulate only a very small portion of the universe, on the scale of one 100-trillionth of a meter, a little larger than the nucleus of an atom, using a technique called lattice quantum chromodynamics and starting from the fundamental physical laws that govern the universe.
Though our potential to create larger simulations - the size of a molecule, then a cell and eventually a human being - is growing, many generations of computing power growth are necessary before a large enough simulation can be created to allow us to understand the constraints on the physical processes that would indicate we are living in a computer model.
Savage said, however, signatures of resource constraints in present-day simulations are likely to exist as well in simulations in the distant future. These constraints include the imprint of an underlying lattice if one is used to model the space-time continuum.
The space-time continuum is basically divided into a four-dimensional grid by supercomputers performing lattice quantum chromodynamics calculations, allowing researchers to look at what is called the strong force. This is one of the four fundamental forces of nature; specifically, the one that binds subatomic particles called quarks and gluons together into neutrons and protons at the core of atoms.
"If you make the simulations big enough, something like our universe should emerge," Savage said. He added that it would become a matter of looking for the constraint signature in our physical universe that has an analog in the current small-scale simulations.
The team, which also included Silas Beane of the University of New Hampshire, suggested that the signature could show up as a limitation in the energy of cosmic rays.
The current study has been posted on arXiv, an online archive for preprints of scientific papers in a number of fields, including physics. The findings suggest that the highest-energy cosmic rays would not travel along the edges of the lattice in the model but would travel diagonally. These rays would also not interact equally in all directions as they would otherwise be expected to do.
"This is the first testable signature of such an idea," Savage said.
Zohreh Davoudi, a UW physics graduate student, suggests that if our universe is a simulation, then those running it could be running other simulations as well, essentially creating other universes parallel to our own.
"Then the question is, 'Can you communicate with those other universes if they are running on the same platform?'" she said.
Sources and more information:
Do we live in a computer simulation? UW researchers say idea can be tested By Vince Stricherz Posted under: News Releases , Research , Science A decade ago, a British philosopher put forth the notion that the universe we live in might in fact be a computer simulation run by our descendants. While that seems far-fetched, perhaps even...
( via redorbit.com )
Dragon15066 wrote December 13, 2012 1:24:15 AM CET
Let us not forget the Star-Trek The Next Generation episode, when a character, Moriarty in one of the hola deck programs became self-aware. The answer to the problem was to create a computer chip that would simulate reality. While he thought that he was on to a new journey after being given a shuttle craft to leave the ship. Even the shuttle craft was a simulation. When the show ended, we see that Moriarty was transfered from the holodeck to a computer chip where he could "live his life" forever and never know that he was in this program. To him, he left the holodeck in a shuttle craft in our reality and he would NEVER know. In that program, the chip was put away and left alone for Moriarty to travel the Universe, never knowing that he was actually in a small chip designed to simulate stars and whatever else needed to be convincing. It was strange because watching the end and seeing this little chip in our dimension was a universe in itself for Moriarty.