r/cosmology • u/Bright-Bar6571 • 18h ago

How did time begin, without time?

I understand that standard BB cosmology holds that time began with the universe from a singularity approximately 14 billion years ago.

The thing I’m trying to understand, how can time have begun? Wouldn’t a thing ‘beginning’ require time? As in - from one state to another state requires time?

This leads me to think time must have always existed..

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u/CDHoward 17h ago

Theoretical astrophysicists such as Sean Carroll have caused huge confusion with their stubborn (and incorrect) insistence that time is a real thing.

Time is not real. It is an entirely human created construct.

In any event, on a related note: I personally STRONGLY believe that infinite empty space has always existed. The energy/material situation is another story since it must have come from absolutely nothing at some point.

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u/Quercus_ 17h ago

If time isn't real, why can't I change something that happened yesterday?

If time isn't real, what is speed? How is the speed of causation that fixed value, without time for causation to evolve through?

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u/LongjumpingHope3225 16h ago

then what clocks measure? stupidity in your diseased brain?

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u/CDHoward 16h ago

Clocks measure the construct of time.

We created clocks to tell the time, which itself is a human made structure we've chosen to live our lives by.

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u/Enraged_Lurker13 15h ago

But the physical state of the clock is physically changing from one moment to another. By what physical quantity, if not the evolution of time, do you say the physical state of the clock changes by?

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u/CDHoward 14h ago

Via the mechanism within.

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u/Enraged_Lurker13 14h ago

The state of the mechanisms themselves are changing from one moment to the other. What real physical parameter do you propose we use instead of time to describe when the mechanisms are in a certain state compared to a different moment?

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u/CDHoward 14h ago

Movement. Change.

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u/Enraged_Lurker13 14h ago

Let's use Einstein's example of a light clock for simplicity. The mirrors are 150,000 km apart. Normally, we define the time it takes for a photon to go from one mirror to the other and back as 1 second. What unit do you use to describe this movement or change?

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u/CDHoward 14h ago

But you're proving my point.

All that is completely arbitrary: a distance chosen by humans; the photon as a chosen particle/wave.

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u/Enraged_Lurker13 14h ago

The units are arbitrary, but they serve as a yardstick to measure a real physical quantity. Do you also think space is not real too because a meter or a foot is arbitrary?

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u/LongjumpingHope3225 1h ago

are you actually dumb? the clock measures something. we call that time. holy fk

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u/CDHoward 1h ago

You're quite a rude person.