One of the biggest problems with time is its many definitions... (I count 13 +). Many scientists routinely segue between different definitions and there is no indication that they even realized they had done so.

No measurement of time is without the measurement of motion, as time is a measurement of motion. Yet, motion is a variable that is dependent on time (distance travelled divided by time), so it is a convolution of relative motion. The fascinating aspect of motion is we are all moving towards the "Great Attractor" at such an incredible speed that just a slight difference in the motion of the movement of our hands warps space-time. The experiment with entanglement with the polarization measurement velocity makes me question both time and the speed of light though as it seems to exceed the universal speed limit. I really enjoyed this talk, especially the discusssion on measuring "constants" over long periods of "time" to see if they are not "constant".

@morphixnm

15 күн бұрын

That we use the motion of one thing to gauge the motion or change of another thing is just a measurement of change, and we call that time. This does not mean that time is being measured, just that we call the result of sucha measurement time. This is exactly analogous to measuring the length or weight of something, where the units of measure are not posited to be IN the thing being measured. Does anyone think we measure inches or ounces that somehow exist IN a brick?

Love the idea of students reading subject matter before coming to class, then debating the subject moderated by a Platonian style teacher. It's pretty obvious that the pedantic method has some merit early in education, but at some point, perhaps middle school, children must learn to actually think and have their ideas questioned.

i disagree with a premise stated in the intro: the speed of light seems to be a universal constant of time…

All concepts have limitations. What we call time is essentially one set of changes ( in a measuring device), relative to another set of changes ( in that which is measured). All truth is relative..

I just want to point out how intune Dr. Keating is with his guests through an explample that starts around the 24:25 mark- Chad is talking about an in person lecture vs online and how he is able to read the room in person and adjust acordingly for his audience. 24:54 mark- Brian takes a sip of his drink and is nodding his head and does a few eye twitiches, showing ihis own attention span fleeting. - I got a chuckle from your facial expressions after hearing Chad's explanation betweeen the online and in person lessons.

Hi, amazing talk, very interesting that experiment with aluminum ion clocks......all the best.

@DrBrianKeating

18 күн бұрын

Thank you! Cheers!

📍25:52 2📍36:28 3📍25:52 4📍40:18

I imagine our observation of the passage of time is analogous to red-shift; in so far as our relative universe "appears" to expand according to our deceleration and our observational frequency of time passing slows as seen in a red shift. Meaning If we were present at the "big bang" an observed year or a lifetime of events at the beginning occurred within a day in our slower observational measurement of time. e.g. The big bang was not that long ago in relation to our linear measurement of time. This foundational concept provides a door to many more thought experiments.

Book cover: Gears from the Antikythera Mechanism??

At 30:00 Dr Orzel talks about to space time keeping and measuring the oscillations of a caesium atom because a second is a second. But would that measurement be affected by being on Earth, or Mars, or cruising in freefall beyond Neptune, or in orbit around Jupiter? Is "a second, a second, a second" or do we need some frame independent conversion? Eg 10 seconds at 1G (similar to how we do with physical properties like the boiling point of water e.g. 100C at 20C at sea level)?

I think there is a mistake in the statement which says that "if the entropy increase is symmetrical then why was the entropy small in the past". The example given is "a gas was in the corner of a box and is now spread out". When we think about the event in the past when the gas was in one corner, that is a snapshot of a state which when happened was going forward in time. But if we start with " gas in the corner" of a box, and somehow think of reverse flowing time (which BTW I think it is meaningless concept - will talk about that in a second) - then the entropy will increase. I do not think there is any mystery in that. This is because there is a Hysteresis in this idea. If we reverse the velocities of the particles, which BTW will require expending work on our part, but still move forward in time we will see the entropy decrease. But if the time itself was made to flow in reverse the entropy will increase as particles left to their own natural evolution with tend towards increasing entropy. This is what I mean by Hysteresis. And that in fact brings us to the point that reverse flowing time is a meaningless concept. I think the use of the word "forward" flow of time gives a misapprehension that therefore "reverse" flow of time is a meaningful idea. It is like this - positive three apples is a physical idea but negative three apples is a meaningless idea. IMO the original use of "forward" flow of time has misled us. Time only flows in one direction before -> after. In a CD or a video tape we can reverse the video and see it backwards. But remember the time is still flowing forward, it is just that already recorded snapshots (which were already recorded) in the video are played in reverse order.

One may not judge a book by it's cover, empathy can judge another closed system.

It’s actually a gravy. Time gravy.

don't forget those factors ( being on earth ) will effect the propagation speed of the cesium atom changing that number slightly in vacuo.

How long is now? When exactly does the present become the future (or the past)? Also, what did Einstein or other great thinkers say about entropy and the passage of time?

Time is just continuation of kinetic material processes. Cyclic kinetic processes quantify regular time periods. I'm not sure it's helpful to say 'time slows down' when clocks run slower under higher gravity as there could possibly be some kind of universal clock with an absolute constant tick (perhaps even speeding up or slowing down over time...) as well as relative local time. Time needs to be split into 'All Time', 'The Present' and 'Measured Time'... All Time is not stored, only The Present exists and time measurements vary locally with gravity and velocity.

it is real it has to do with entropy and describes how things change.There is also time dilation because of gravitational and velocity related reasons in general and special relativity

میبینم که خیلی درگیر جاذبه و زمان هستید 😁👍👍💚💚

If the universe is same 13.8 (approx) billion years old from every point in the universe, then there is a hyper-surface of events that are 13.8 (approx) billion years aware from the reference point (the Big bang). Then by definition that is the global now. And that is what I understand to mean by the work now. There is also perception now at a given event in spacetime that is defined by the surface of the past light cone for signals travelling at the speed to light, or the body of the light cone for signals travelling less than the speed of light. Heck, scientists even say things like - we do not know what is happening on the Sun right "NOW", but only know in 8 minutes. Then what is that NOW in that sentence? In other words, when we talk about "now" like in this video we should be clear which "now" we are talking about. IMO intuitively the lay people understand the meaning on "now" to mean the global now I talked about above. So for the perception now should use a different word or compound word and then proceed to say, "Sorry, there is no (perceptive now)!"

Yes, and clocks.

Time. A concept man had to create to keep from throwing up.

Time doesn't have time for itself.

Of course time exists.. Everything exists in the present. Your perception of that may change, but the present time is constant no matter where you are in the universe.

Time is a measurement of motion or change accomplished by referencing the motion or change of something else. A clock is whatever we care to use as that reference. From this it should be obvious that clocks are not measuring some real thing in the universe we call time any more than a tape measure is measuring inches existing within or on a thing being measured. Einstein mistakenly reified the concept of time and then went on to combine it with space, leading physics astray all these many years. Brian and his guests never show that time exists but talk about it that way to no end. I guarantee that no one here can successfully show or argue that there is anything more than motion needed to explain change, or that time has any physical existence.

Is or was the "How to teach physics to your dog" the Textbook for your school professor?

time is a purely local phenomena

Where we live it exists, though different, which spacecraft take into account. Would an atomic clock orbiting out with Webb be more precise gravitationally than earth clocks, and does anyone really know what time it is, does anyone care? In models when the universe collapses motion and time has no meaning. If all the matter of the Universe were in a black hole in the real world there would be layers and gravity would easily reach the outer layer and it might not even be black, the resistance to gravity in the center may become too great and things may collapse to Planck length separation, not move, and time become meaningless. Gravity easily gets in and out of the largest known black holes, though you have to ask does the matter circling sees all the matter of the core, since the differences in the gravitation frame of that center and the circling matter.

Why am I getting older?

"What is clocks?"

I'm going to make the time to listen to this one.

💖💖💖💖

Time is motion. Does motion exist, or is reality frozen?

"Time" is causality, distance is an illusion.

In the late 19th century the board of deputies had in their sight the North of Australia as the promised land, but for the English, Australians might have been the Palestinians.

Time is a emergent aspect of reality! The moment energy changes from one state to another, time emerges. Time does not exist for anything that travels as fast as light, it just is. Time might not exist in a singularity, and that might be why our physics breaks down. Without change there is no time! I am probably wrong but time is not a physical thing so time does not exist as a thing.

@babyyoda3118

7 күн бұрын

So your thoughts, consiousness and love for your family doesn’t exist! Why do you even bother to comment!

@johnjay6370

7 күн бұрын

@@babyyoda3118WHAT ARE YOU TALKING ABOUT?

Can we see in which direction the Big Bang singularity is???

@bozo5632

5 күн бұрын

It's about 46 billion light years away in every direction.

"One of the happiest thoughts in my life is when I realized that if there where no Objects, there would be no Time." Picksalot Time is just a handy way of measuring Entropy. When Entropy is zero, Time stands still. 😎

@stevenverrall4527

18 күн бұрын

Not true, since an isolated precessing proton effectively has zero entropy yet acts as a clock.

@picksalot1

18 күн бұрын

@@stevenverrall4527 A Proton is an object, so what I thought and wrote remains true.

Entropy is the Unsexy Time.

Very interesting conversation, however, why no mention of the key role John Harrison played solving the difficult problem of longitude with his portable sea clock? I recommend the book “Longitude” by Dava Sobel. It’s also well worth visiting the Greenwich Observatory where the original Greenwich Mean Time (the yearly average (or 'mean') of the time each day when the Sun crosses the Prime Meridian at the Royal Observatory Greenwich) can be seen and there is a wonderful museum explaining Harrison’s work and its importance to this day.

The universe doesn’t have a single age. It is both very young and very old depending where it is in the universe. The matter and energy in the universe didn’t make itself and doesn’t direct itself. When it was made and directed, as we see it is inside of us, it is relative to our location and the amount of time has to be determined by an intelligent mind. The existence of the universe doesn’t depend on the universe since the energy and matter in the universe can’t make or direct themselves.

@JungleJargon

18 күн бұрын

@@AlexLightGiver You aren’t being very thorough with your response.

@JungleJargon

18 күн бұрын

@@AlexLightGiver You didn’t actually say anything relevant to either the video or what I said.

@bryandraughn9830

18 күн бұрын

Sounds like foregone conclusions.

@JungleJargon

18 күн бұрын

@@bryandraughn9830 There are a lot of assumptions in science that have to be pointed out. That’s why I point them out.

@JungleJargon

18 күн бұрын

@@AlexLightGiver You have no evidence for infinite numbers of universes and you didn’t say where the power comes from.

Some interlopers into our reality seem to have a different explanation of time. It can be 40 ft in diameter and 3 times that size inside. The TARDIS. Us baby boomers are far sighted compared to our kids children. Gen X and their children, millennials have bread a dead end.

There's no "time particle" or "time field", because time is a "sense".

@dzikdziki2983

18 күн бұрын

Time is just how we see entropy

Yet again, I have to leave this episode to listen to an excellent author after watching the first few mins bcs the way BK's elongated way of wording questions... that's one of the reasons few subscribe his channel

Time is not an illusion, it's the third spatial axis that is an illusion. (T,x,y,z)=(T,x,y, illusion)

Too many adds!

Nothing ticks in consciousness.

Time is a product of our suns biosphere. Many suns, many biospheres, many clusters of suns, many galaxies, many time. Many solar free will, many galactic free will, many conscious free will. Discrete blocks in a continuously changing fractal.

The illusion is this question and podcast.

مقاله یا کتاب بنویسید چرا نمینویسید و یا حول محورش مقاله ای نمینویسید میدونی چرا ؟😄 قبلا که گفته بودم خوب نمیشه و زشت میشه اگر دیگه من با فرمولها و کتابهام با کمک یکی از فیزیکدانها بنویسم و چاپ کنم بد نمیشه برای شما ؟؟؟.

In Torah Genesis first two days no " time" existed yet. No sun moon planets no calendar no hours minutes days months years etc. Infinity existed תודה רבה שלום

@IndianArma

18 күн бұрын

Then how did they know it was during the 'first two days'. You can't use a frame of time reference to say time does not exist

@MitzvosGolem1

18 күн бұрын

@@IndianArma true.. First existence .. epoch . Good point . No actual time period created yet .👍

There is literally no such thing as time it is a man-made concept he said it himself it's literally the movement of the Sun and we're supposed to believe that you can take this and combined it with space and make space time really?

hahaha

Your toxic narcissism is holding you back so hard. If you grew some humility, Brian, you’d be tolerable.