...Except that you have that precisely backward - the younger twin (or, if you'd rather, the one who looks younger and lives longer) would be the one who was traveling at relativistic speeds.
Also, what happens in Stripean physics when the rate of acceleration to relativistic speeds is a gentle constant (say, 1g perhaps?). In a year of constant acceleration, you'll end up traveling at 87% of the speed of light. When you decelerate, you can calculate a trajectory that will use pseudo forces to compensate for the change in apparent gravity during deceleration. The upshot is that the traveler on this ship experiences constant acceleration that's equivalent to earth's gravity. Presumably, it is your view that both the space ship clock and the traveler's own age will remain synchronized with the time recorded by a clock on earth?
If Einstein was wrong, there is no twins paradox. :nono:It looked like you were trying to give an alternative explanation for the standard answer used to satisfy the Twin Paradox. You're saying that that's not the case?
The clocks will differ according to relativity, but the only difference between the twins will be the adverse effects of having endured abnormal gravitational environments. There will be no difference in the amount of time each has experienced.So let's say that the trip started when the twins were born, and that the time the trip took was measured to have taken 10 years from earth, but the clock on the fast-travelling space ship measured 5 years. You're saying that when the twins are reunited, the travelling twin's clock will appear to have run five years slower (i.e. only five years have elapsed), but that travelling twin himself will appear to be five years older than his brother? (i.e. he will look 15)?
Relativity theory can very accurately predict what effect gravity has on clocks. I am willing to accept whatever relativity predicts for the time on a clock after whatever conditions are experienced. What we do not accept is that gravity had any effect upon time. Time is an abstract noun, not a physical entity. You might as well try to convince us that speed affects love.Also, what happens in Stripean physics when the rate of acceleration to relativistic speeds is a gentle constant (say, 1g perhaps?). In a year of constant acceleration, you'll end up traveling at 87% of the speed of light. When you decelerate, you can calculate a trajectory that will use pseudo forces to compensate for the change in apparent gravity during deceleration. The upshot is that the traveler on this ship experiences constant acceleration that's equivalent to earth's gravity. Presumably, it is your view that both the space ship clock and the traveler's own age will remain synchronized with the time recorded by a clock on earth?
The clocks will differ according to relativity, but the only difference between the twins will be the adverse effects of having endured abnormal gravitational environments. There will be no difference in the amount of time each has experienced.
Correct. One way to falsify Einstein's idea is to show that different types of clocks are affected to different degrees by gravity.So the chemical reactions that metabolism is based on, are not affected by relativity in the same way that an atomic clock would be. In Stripean physics, what if we then built a clock based on the same chemical reactions that occur during metabolism? Since metabolism isn't affected by relativity in Stripean physics, then our new clock would measure this "real" time and not be slowed down by relativity.
I'm not trying to explain anything away. If velocity is the only thing affecting the clock then velocity affects clock and this can be accurately predicted by relativity. But there is no way you can send one twin on a trip like you describe at not alter his gravitational environment.By the way, in the example that Flipper proposed, the gravitational environment that the traveling twin endured would be exactly the same as the gravity experienced by the stationary twin on Earth. You can't explain away any differences by stress from being heavier. Don't know how you missed it, since that was the whole point of his example.
Get to it, my man - a Nobel Prize awaits!Correct. One way to falsify Einstein's idea is to show that different types of clocks are affected to different degrees by gravity.
If velocity is the only thing affecting the clock then velocity affects clock and this can be accurately predicted by relativity. But there is no way you can send one twin on a trip like you describe at not alter his gravitational environment.
What is wrong with you people? :AMR:Get to it, my man - a Nobel Prize awaits!
You can't launch a spaceship at 1g. Escape velocity is 11km/s. You don't need the rocket to reach that speed, but you will need to accelerate it. And you cannot do that without changing the gravitational environment for any passengers.You could have a spaceship that accelerates at 1g, thus duplicating the Earth's gravity. It could accelerate away for 1/4 of the trip, then turn around and accelerate back towards home for half the trip, then turn around and accelerate away (thus decelerate) for the last 1/4, putting the traveling twin back at Earth, having experienced his normal weight the whole trip.
And if he is not right then there is no paradox.If Einstein is right, then the traveling twin would have aged less.
Would this be the ubiquitous appeal to popularity that seems to follow atheists around like a bad smell, or are you trying to emotionally manipulate me? Who cares who disagrees! Show me why what I say is unreasonable and quit with the nonsense! :dizzy:I agree with this, Flipper agrees with this, and it seems from his OP, Bob Enyart agrees. You seem to be the only one who disagrees.
You can't launch a spaceship at 1g. Escape velocity is 11km/s. You don't need the rocket to reach that speed, but you will need to accelerate it. And you cannot do that without changing the gravitational environment for any passengers.
=Frayed Knot;2885943]But it's not just gravity - if your twin brother got onto a spaceship and headed off at great speed in one direction for a few years, then turned around and came back, his clock would show that, for example, only ten years had passed while your clock showed 20 years, and you would have visibly aged by twice as much as him.
If every physical process that exists, including clocks, your rate of aging, chemical reactions, radioactive decay, etc., is affected by relativity, then how is that different from saying that time itself is relative?
You are taking a position of certainty that you're right, but what I'm trying to show is that your position has not been thought out. Very smart people have thought through all the details, and they all agree that time is relative.
=Frayed Knot;2886978]When I jumped into this thread recently, I had not ever gone back and read the first post by Pastor Bob from 2006. I did that today, and Bob, from what I gathered, would agree with what I've said here, about clocks, including our biological clocks (our sense of time passing), would be slowed down by traveling that fast. His disagreement seemed to be just a semantic one, about whether we should measure the passage of time by clocks and our rate of aging, or by the Earth's rotation.
So I guess I could tell you that if you disagree with what I had written, you could take it up with Pastor Bob. Instead, I'll just point out that relativity has been tested again and again and again for nearly 100 years, and every time it's been tested, it's exactly right.
To whatever distance you wish to travel, the same amount of gravitational disturbance will be felt. Whether that is spread out over a slow burn and launch or (as with practical launches) packed into one massive initial thrust makes no difference to the sum total of gravitational disturbance. I think that, with the twins paradox, the whole thing can be studied as a case of gravity affecting clocks.But you would need to change it only briefly and minimally. You could accelerate at 0.01g, making the force on the rocket 1.01g, for a couple of hours, then dial it back to 1.00g for the rest of the trip. Do you think that the stress from an extra 0.01g for a few hours would affect a person's apparent age, so much so that there would be what looks like a decade of difference between him and the twin that stayed at home?
It's happened before. It'll happen again. :idunno:Stripe, you're steadfastly holding to the claim that physics that's been understood and accepted by everyone for nearly a century is grossly wrong.
:doh: Gravity does not affect time. It affects clocks. :sozo:I'm trying to tease out from you what it is that you believe in its place, and you're resisting as much as you can, because you know that you have no ideas of your own, just this belief that accepted physics has to be wrong.
And it's not like I'm the only one saying this. There are plenty of vastly more qualified people saying exactly what I'm saying. Where do you think I get my material?
We measure time with clocks. If you were put in an isolated container and asked to determine how much time passes between two events, you would need to “time it” – that is, use a clock. Unknown to you, the container you are in may be freely falling in a strong gravitational field, or it may be floating far from any appreciable sources of gravity. For you, unable to compare with anything outside your container, could you tell if the clocks you have were not measuring time the same as they were at some time earlier?Gravity does not affect time. It affects clocks.
I don't know how much simpler it can get.
You're not getting what I'm saying. Let's consider this - one twin starts out our experiment in orbit around the Earth. At the start, he and his twin are the same age. They look identical, and each would agree that he's lived for the same number of years. When we start the experiment, we accelerate the twin that has been orbiting, at exactly one g. For the whole trip, he experiences exactly one g of acceleration, although his speed has increased to close to light speed, then slowed down to zero, then accelerated back towards Earth at one g, and again slowed down at one g so that he comes back into an orbit of the Earth, and that's the end of our experiment. During the trip, the traveling twin kept a regular 24-hour schedule. He regulated his day by his clock, and his body clock agreed with the clock on the wall. At the end of the trip, the Earth twin had experienced 20 years. Every day of that is accounted for. And at this time, the traveling twin experienced ten years. Every day was a normal day to him, ten years' worth of them. The twins also have apparently aged according to these clocks and logs. One twin looks ten years older than the other.To whatever distance you wish to travel, the same amount of gravitational disturbance will be felt. Whether that is spread out over a slow burn and launch or (as with practical launches) packed into one massive initial thrust makes no difference to the sum total of gravitational disturbance. I think that, with the twins paradox, the whole thing can be studied as a case of gravity affecting clocks.
Well, there are various kooks and cranks who say Einstein was wrong. Prominent physicists get letters from them all the time, which is not surprising given that some proportion of our population is out of touch with reality. However, I'm curious where you get your material. I thought you were making it up as you go. A link would be appreciated.And it's not like I'm the only one saying this. There are plenty of vastly more qualified people saying exactly what I'm saying. Where do you think I get my material?
A clock is just a physical process that we've exploited to keep track of time. Atomic resonance is a physical process, but also so is metabolism. If all physical processes are affected by relativity (which is implied by your saying that all clocks are affected), then you'd have to agree that the traveling twin aged less. You've boxed yourself into a corner here.:doh: Gravity does not affect time. It affects clocks. :sozo:
I don't know how much simpler it can get.
OK.I for one do not know, but I would appreciate it if you would tell me. Please provide citations to the scientific literature.
This question is of no relevance to the conversation. The changes in gravity affect atomic clocks to a degree predicted by relativity. There is no reason to say that the abstract, intangible noun, time, is affected. You might as well try to convince us that gravity affects love.We measure time with clocks. If you were put in an isolated container and asked to determine how much time passes between two events, you would need to “time it” – that is, use a clock. Unknown to you, the container you are in may be freely falling in a strong gravitational field, or it may be floating far from any appreciable sources of gravity. For you, unable to compare with anything outside your container, could you tell if the clocks you have were not measuring time the same as they were at some time earlier?
OK. If you can get relativity to predict that the atomic clock will run slower for the flying twin under these conditions, I will predict no significant difference between the age of the twins on return. :idunno:You're not getting what I'm saying. Let's consider this - one twin starts out our experiment in orbit around the Earth. At the start, he and his twin are the same age. They look identical, and each would agree that he's lived for the same number of years. When we start the experiment, we accelerate the twin that has been orbiting, at exactly one g. For the whole trip, he experiences exactly one g of acceleration, although his speed has increased to close to light speed, then slowed down to zero, then accelerated back towards Earth at one g, and again slowed down at one g so that he comes back into an orbit of the Earth, and that's the end of our experiment. During the trip, the traveling twin kept a regular 24-hour schedule. He regulated his day by his clock, and his body clock agreed with the clock on the wall. At the end of the trip, the Earth twin had experienced 20 years. Every day of that is accounted for. And at this time, the traveling twin experienced ten years. Every day was a normal day to him, ten years' worth of them. The twins also have apparently aged according to these clocks and logs. One twin looks ten years older than the other.
Why not just tell me why I'm wrong rather than looking for someone else to call wrong? :idunno:Well, there are various kooks and cranks who say Einstein was wrong. Prominent physicists get letters from them all the time, which is not surprising given that some proportion of our population is out of touch with reality. However, I'm curious where you get your material. I thought you were making it up as you go. A link would be appreciated.
You've boxed your straw man into a corner. :chuckle:A clock is just a physical process that we've exploited to keep track of time. Atomic resonance is a physical process, but also so is metabolism. If all physical processes are affected by relativity (which is implied by your saying that all clocks are affected), then you'd have to agree that the traveling twin aged less. You've boxed yourself into a corner here.
One way to falsify Einstein's idea is to show that different types of clocks are affected to different degrees by gravity.
Correct. One way to falsify Einstein's idea is to show that different types of clocks are affected to different degrees by gravity.
But I can change my mind if I have good evidence.
Were you aware that people have been trying to falsify it, in various ways, for nearly 100 years, and so far it's withstood every test with shining colors?
Einstein's theories of relativity confirmed by NASA | |