Does time exist?

A good place to start might be to understand how/why a MEMORY is required to time things.

You even need a memory to acknowledge that events are occurring.
Without memory we would not be able to "re-cognize" anything at all.

As Anil Seth posits: "we create our reality from the inside out as much as from the outside in"

Sometimes our memory fools us;


The squares marked A and B are the same shade of gray.


A rectangle of the same color has been drawn connecting the two areas of the image.

This illusion is caused by a false memory, an ancient survival mechanism (engram) to "recognize" possible danger hidden in the shadows.

Memory is Dependent on Synapses Between Engram Cells
When comparing engram-engram synapses versus synapses that involved non-engram cells (which were not labeled as active during fear conditioning), they found that dendritic spines were larger and more numerous on engram cells receiving input from other engram cells only.
This indicates that synapses activated between engram cells during fear conditioning could cause synaptic connectivity between these cells to strengthen.
When assessing the relationship between synaptic strength and memory, the authors found that synapses between engram cells were stronger and denser after receiving a stronger shock versus after receiving a weaker shock.
This indicates that strength of a memory (due to strength of a foot shock) is related to synaptic connectivity and the strength of connections between engram cells in the hippocampus.

This is the first study to show that engram neurons that are activated during a learning task (fear conditioning) are more likely to have stronger, denser synaptic connections with each other. We now know that the, strength of connections between engram cells in the hippocampus underlies memory formation and strength.

p.s. IMO, this is very much related to the function of microtubules in the brain.

I believe this is also responsible for the apparent fast (time flies) or slow (time crawls) subjective passage of time in our interactive experience with the environment.
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I don’t think there is anything that exists that doesn’t have a memory
Max Tegmark has a nice analogy.

He shows his wedding ring that is inscribed with his wife's name and demonstrates that solids do have capacity for long term memory.
Then he draws his wife's name in a puddle of water and demonstrates that liquids have very little capacity for memory.

David Bohm demonstrated that very viscous liquids have capacity for long term memory if the inscribing is done slowly without causing turbulence.
I don’t think there is anything that exists that doesn’t have a memory
Every object in the universe and the universe itself has a mass energy history/memory recorded in its current physical configuration. Everything is a product of its history.
For us to start measuring stuff we need a 3rd party memory and processor?
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This maybe interesting . You can buy time .

Just hit the play arrow. It'll get you to YouTube
Why is it necessary that time must exist apart from physical existence"?

Why can there not just be a timeless permittive condition (dimension) that simply allows for physical phenomena to occur chronologically and for arbitrarily measurable "duration" to emerge as what we call "time".

Note that "standard time" is a derivative of a physical phenomenon (caesium decay).

Time is only measurable from physical dynamics, just like mathematics.

Is time based on math?


In math, time can be defined as the ongoing and continuous sequence of events that occur in succession, from the past through the present to the future. ... We measure and define what time of the day it is using clocks. A clock in general has 12 numbers written on it, from 1 to 12. It has an hour hand, and a minute hand.
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Jun 22, 2019 — Among physicists, there is no real doubt that time does really, truly exist. It's a measurable, observable phenomenon.

If that is the case, then do mathematics exist? It is a measurable, observable phenomenon!
So how big is math?
How big is time?
Modern physics teaches us that time is one of the most mysterious aspects of our universe, though it may at first seem straightforward. Einstein revolutionized our understanding of the concept, but even with this revised understanding, some scientists still ponder the question of whether or not time actually exists or whether it is a mere "stubbornly persistent illusion" (as Einstein once called it). Whatever time is, though, physicists (and fiction writers) have found some interesting ways to manipulate it to consider traversing it in unorthodox ways.
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Does colour exist apart from physical objects?
These are all the same question.

All these phenomena are emergent properties of physical dynamics and mechanics.

Does wetness exist apart from dry H and O atoms?

Time does not exist except as an emergent result of duration of physical relationships.

du·ra·tion, noun
  1. the time during which something continues.
    "a flight of over eight hours' duration"
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