Quantum mechanics is known for its strange and sometimes counterintuitive ideas. At very small scales, particles don’t behave like on a regular basis objects. As a substitute, they’ll exist in multiple states directly, an idea generally known as superposition. Physicists describe this behavior using a mathematical object called a wavefunction. Yet this picture clashes with what we observe in day by day life, where objects occupy one definite place or state at a time. To resolve this, scientists often propose that when a quantum system is measured or interacts with an observer, its wavefunction collapses right into a single consequence.
Now, with support from the Foundational Questions Institute, FQxI, a world group of physicists has taken a better take a look at alternative explanations generally known as quantum collapse models. Their findings suggest these ideas could have surprising consequences for the way time itself behaves, including tiny limits on how precisely it may be measured. The research, published in Physical Review Research, also offers a possible approach to test these models against standard quantum theory.
“What we did was to take seriously the concept collapse models could also be linked to gravity,” says Nicola Bortolotti, a PhD student on the Enrico Fermi Museum and Research Centre (CREF) in Rome, Italy, who led the study. “After which we asked a really concrete query: What does this imply for time itself?”
Spontaneous Collapse and Testable Quantum Models
Within the Eighties, researchers began developing theories by which wavefunction collapse happens spontaneously, without requiring remark or measurement. Unlike traditional interpretations of quantum mechanics, which mainly offer alternative ways of serious about the identical equations, these collapse models make predictions that might, in principle, be tested experimentally.
“What we did was to take seriously the concept collapse models could also be linked to gravity. After which we asked a really concrete query: What does this imply for time itself?” says Nicola Bortolotti.
Bortolotti and colleagues Catalina Curceanu, Kristian Piscicchia, Lajos Diósi, and Simone Manti examined two leading versions of those models. One is the Diósi-Penrose model, which has long proposed a connection between gravity and the collapse of the wavefunction. The opposite is Continuous Spontaneous Localization. Of their recent work, the researchers established a quantitative relationship between this second model and fluctuations in spacetime brought on by gravity.
Tiny Time Uncertainty and Clock Precision Limits
Their evaluation shows that if these collapse models accurately describe reality, then time itself can’t be perfectly exact. As a substitute, it will contain a particularly small level of inherent uncertainty. This is able to set a fundamental limit on how precise any clock could ever be.
“When you do the calculation, the reply is obvious and surprisingly reassuring,” said Bortolotti.
Importantly, this effect is much too small to affect any current technology. Even essentially the most advanced atomic clocks wouldn’t detect it. “The uncertainty is many orders of magnitude below anything we will currently measure, so it has no practical consequences for on a regular basis timekeeping,” says Curceanu. “Our results explicitly show that modern timekeeping technologies are entirely unaffected,” adds Piscicchia.
Quantum Mechanics, Gravity, and the Nature of Time
For many years, physicists have been attempting to unify quantum mechanics with gravity. Each theory works extremely well inside its own domain. Quantum mechanics describes the behavior of particles at microscopic scales, while general relativity explains how gravity shapes the large-scale structure of the universe, including stars and galaxies. Nonetheless, the 2 frameworks treat time in very alternative ways.
“In standard quantum mechanics, time is treated as an external, classical parameter that is just not affected by the quantum system being studied,” explains Curceanu. In contrast, general relativity describes time as something that may stretch and bend under the influence of mass and energy.
“The uncertainty is many orders of magnitude below anything we will currently measure, so it has no practical consequences for on a regular basis timekeeping,” says Catalina Curceanu.
By constructing on earlier ideas that quantum mechanics is likely to be a part of a deeper theory, the brand new research points to possible links between quantum behavior, gravity, and the flow of time itself.
Curceanu emphasized the importance of exploring unconventional ideas in physics. “There usually are not many foundations on the earth that are supporting research on most of these fundamental questions on the universe, space, time, and matter,” says Curceanu. “Our work shows that even radical ideas about quantum mechanics will be tested against precise physical measurements, and that, reassuringly, timekeeping stays one of the crucial stable pillars of contemporary physics.”
This work was partially supported through FQxI’s Consciousness within the Physical World program. You’ll be able to read more concerning the team’s grants within the FQxI article: “Can We Feel What It’s Wish to Be Quantum?” by Brendan Foster.