Time is “elastic”: Why time passes faster atop a mountain than at sea level

Time is “elastic”: Why time passes faster atop a mountain than at sea level

Since Einstein presented his general theory of relativity, we’ve known that gravity has the ability to warp space and time. Even at low levels, this “time dilation” effect occurs. We experience distortions in how we see time outside of physics, sometimes to startling extents.
Place one clock on top of a mountain. Put another one on the seashore. You’ll notice that each clock displays a different time. Why? Time slows down as you come closer to Earth because, as Einstein proposed in his general theory of relativity, the gravity of a big mass, such as the Earth, warps space and time around it.
This “time dilation” effect was first observed on a cosmic scale, such as when a star passes close to a black hole. The same effect was discovered on a much smaller scale in 2010, when researchers used two incredibly precise atomic clocks, one 33 cm higher than the other. Time went slower as the clock got closer to Earth.
The differences were minor, but the implications were meaningful: absolute time does not exist. Time moves slightly differently for each clock in the world and for everyone of us. But, even if time moves at varying speeds around the cosmos, time still moves in some objective sense, right? Maybe not.
Carlo Rovelli, an Italian theoretical physicist, suggests in his book “The Order of Time” that our perception of time — our sensation that time is always moving ahead — could be a highly subjective illusion. After all, when you examine reality on the smallest scale (at least using quantum gravity equations), time vanishes.
“If I observe the microscopic state of things,” writes Rovelli, “then the difference between the past and future vanishes … in the elementary grammar of things, there is no distinction between ’cause’ and ‘effect.’”
So, what causes us to perceive time as moving forward? Rovelli observes that, whereas time disappears on extremely small scale, we clearly see events occurring sequentially in reality. To put it another way, we see entropy: as order changing into disorder; an egg cracking and getting scrambled.
According to Rovelli, the second law of thermodynamics, which stipulates that heat always moves from hot to cold, describes important features of time. This is only one method. For example, an ice cube never melts into a hot cup of tea. A comparable process, according to Rovelli, could explain why we can only perceive the past and not the future.
“Any time the future is definitely distinguishable from the past, there is something like heat involved,” Rovelli wrote for the Financial Times. “Thermodynamics traces the direction of time to something called the ‘low entropy of the past’, a still mysterious phenomenon on which discussions rage.”
He continues:
“Entropy growth orients time and permits the existence of traces of the past, and these permit the possibility of memories, which hold together our sense of identity. I suspect that what we call the “flowing” of time has to be understood by studying the structure of our brain rather than by studying physics: evolution has shaped our brain into a machine that feeds off memory in order to anticipate the future. This is what we are listening to when we listen to the passing of time. Understanding the “flowing” of time is therefore something that may pertain to neuroscience more than to fundamental physics. Searching for the explanation of the feeling of flow in physics might be a mistake.”
Scientists are still learning a lot about how we perceive time and why it behaves differently depending on the scale. However, outside of the realm of physics, our individual perspective of time is surprisingly elastic.
On a mountain, time moves differently than on a beach. However, you do not need to travel far to encounter strange distortions in your perspective of time. For example, at moments of life-or-death fear, your brain would release massive amounts of adrenaline, which would speed up your internal clock, causing you to view the outer world as moving slowly.
Another common distortion occurs when we direct our attention in specific directions.
“If you’re thinking about how time is currently passing by, the biggest factor influencing your time perception is attention,” Aaron Sackett, associate professor of marketing at the University of St. Thomas, told Gizmodo. “The more attention you give to the passage of time, the slower it tends to go. As you become distracted from time’s passing—perhaps by something interesting happening nearby, or a good daydreaming session—you’re more likely to lose track of time, giving you the feeling that it’s slipping by more quickly than before. “Time flies when you’re having fun,” they say, but really, it’s more like “time flies when you’re thinking about other things.” That’s why time will also often fly by when you’re definitely not having fun—like when you’re having a heated argument or are terrified about an upcoming presentation.”
Psychedelic drugs are one of the most mysterious ways for humans to experience time-perception distortions. Rovelli detailed an LSD experiment in an interview with The Guardian.
“It was an extraordinarily strong experience that touched me also intellectually,” he said. “Among the strange phenomena was the sense of time stopping. Things were happening in my mind but the clock was not going ahead; the flow of time was not passing any more. It was a total subversion of the structure of reality.”
Few scientists or philosophers appear to believe that time is a complete illusion.
“What we call time is a rich, stratified concept; it has many layers,” Rovelli told Physics Today. “Some of time’s layers apply only at limited scales within limited domains. This does not make them illusions.”
The belief that time moves at an absolute rate is an illusion. The river of time may run forever, yet it moves at various rates between people and even within your own mind.









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