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JackButler
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PostPosted: 22:17 - 12 May 2021    Post subject: Reply with quote

This is pure comedy gold, BCF discussing theoretical physics.
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Islander
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PostPosted: 22:36 - 12 May 2021    Post subject: Reply with quote

JackButler wrote:
This is pure comedy gold, BCF discussing theoretical physics.


That would be cosmology.

Anything to contribute?
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Easy-X
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PostPosted: 23:17 - 12 May 2021    Post subject: Reply with quote

Are we not allowed to take an interest in a subject without being an expert in the field?
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Islander
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PostPosted: 23:37 - 12 May 2021    Post subject: Reply with quote

Easy-X wrote:
Are we not allowed to take an interest in a subject without being an expert in the field?


He was probably a cosmology professor at one of the most prestigious universities while he was accumulating all of those bikes and running his multi-million transport business all the time providing special advice to the major world governments. You can't blame him for being a bit picky Razz
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Fat Angry Scotsman
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PostPosted: 10:14 - 13 May 2021    Post subject: Reply with quote

mentalboy wrote:
Fat Angry Scotsman wrote:
...as it is your one and only life you should be fucking living it.

and
Quote:
on a Chinese bike (Zontes ZT125-U)
Confused Laughing


Embarassed well it becomes a Suzuki Katana when I eventually get my A license Embarassed
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Fat Angry Scotsman
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PostPosted: 10:16 - 13 May 2021    Post subject: Reply with quote

Islander wrote:
Easy-X wrote:
Are we not allowed to take an interest in a subject without being an expert in the field?


He was probably a cosmology professor at one of the most prestigious universities while he was accumulating all of those bikes and running his multi-million transport business all the time providing special advice to the major world governments. You can't blame him for being a bit picky Razz


I thought the story was that he was a hedge fund manager? Surprised
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Islander
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PostPosted: 12:43 - 13 May 2021    Post subject: Reply with quote

Fat Angry Scotsman wrote:
Islander wrote:


He was probably a cosmology professor at one of the most prestigious universities while he was accumulating all of those bikes and running his multi-million transport business all the time providing special advice to the major world governments. You can't blame him for being a bit picky Razz


I thought the story was that he was a hedge fund manager? Surprised


Oh probably that as well.
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Jmoan
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PostPosted: 17:15 - 13 May 2021    Post subject: Reply with quote

Islander wrote:
sulphur wrote:


Curiousity is all. Your random everyday dude doesn’t spout such interesting paragraphs. I’m of the impression that’s a specialist field you’re highly educated in. Physics teacher for example?
Or you could just be a jack the lad, who’s self taught through research in a field of interest.
Never mind me, I’m just a random on the tinterwebs..hah


No problem Smile

I'm an Information Security professional but I do have a science background (both of my degrees are sciences) and I try to keep up with things. I'm also an amateur astronomer and well, cosmology... Laughing


It's either that or working in one of the secret UFO bases they have on the western isles.
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Islander
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PostPosted: 17:32 - 13 May 2021    Post subject: Reply with quote

Jmoan wrote:
Islander wrote:


No problem Smile

I'm an Information Security professional but I do have a science background (both of my degrees are sciences) and I try to keep up with things. I'm also an amateur astronomer and well, cosmology... Laughing


It's either that or working in one of the secret UFO bases they have on the western isles.


You mean the Qinetiq testing ranges? Well the only problem is that I'm not in the Western Isles... Razz
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struan80
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PostPosted: 12:07 - 14 May 2021    Post subject: Reply with quote

Skudd wrote:
It makes me think that there is an infinite decimal point numbers between 0 and 1.


That's a good answer. Very Happy Something is either energy or not regardless of size. Dark energy may simply be a 0.

Lol I know nothing about what I'm talking about. It's infinity that's hard to get a handle on, do we use 'tends towards' to make the maths work.

It's actually intriguing stuff. Thanks for all the insights.
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Easy-X
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PostPosted: 13:07 - 16 May 2021    Post subject: Reply with quote

On speed limits and space-time expansion I thought of this analogy...

If you're piloting a submarine through the ocean there's obviously a limit to how fast you can travel due to the friction of the medium. But these numbers that cap your speed have little bearing on the expansion of the underlying medium. You wouldn't use them directly on, for example, the expansion rate of a water balloon.

It's an analogy that offers far too much hope though. The way to travel faster than the submarine is to bypass the troublesome sea altogether and fly above the water - maybe the equivalent of shifting to a dimension with different physics. And like flying a plane there'll be a considerable energy cost vs travelling via "classical physics."

Maybe the secret is only partially enter the alternate dimension; much like a ship skimming the surface of the water.
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Islander
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PostPosted: 14:33 - 16 May 2021    Post subject: Reply with quote

Easy-X wrote:
On speed limits and space-time expansion I thought of this analogy...

If you're piloting a submarine through the ocean there's obviously a limit to how fast you can travel due to the friction of the medium. But these numbers that cap your speed have little bearing on the expansion of the underlying medium. You wouldn't use them directly on, for example, the expansion rate of a water balloon.

It's an analogy that offers far too much hope though. The way to travel faster than the submarine is to bypass the troublesome sea altogether and fly above the water - maybe the equivalent of shifting to a dimension with different physics. And like flying a plane there'll be a considerable energy cost vs travelling via "classical physics."

Maybe the secret is only partially enter the alternate dimension; much like a ship skimming the surface of the water.


The only constant is the speed of light. Distance and time are variable in a relativistic frame of reference - distances become less, time slows. There really aren't any physical analogies - even the rubber sheet with weights on it isn't a good analogy.

If you want to exceed the speed of light in our universe, then the secret appears to be to wrap a bubble of space time around your ship and then that can exceed the physical limits in the universe simply because it's no longer in it.

There are some problems with that approach though. First it appears to require negative energy density and for that you're going to need exotic matter neither of which have been discovered and if they can be made, are likely to need unfeasibly large amounts of energy. Second, the destination system is going to have to deal with the infinitely blue shifted radiation front generated by the drive and projected straight at it.

It's an interesting concept though and worth reading about. Here's a starting point:

https://en.wikipedia.org/wiki/Alcubierre_drive
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Easy-X
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PostPosted: 16:30 - 16 May 2021    Post subject: Reply with quote

ppl have looked at the equations to try and drop the negative energy requirement and they recently managed it. You still need the equivalent energy output of a star but in relative terms that's more manageable than creating negative energy Laughing

https://newatlas.com/physics/ftl-warp-drive-no-negative-energy/

So maybe it'll be called a Lentz Drive Smile

I still think there's some mileage in the sailing analogy. The topology of warp bubbles and the "normal" universe are considered as separate things. I suspect there'll be some interesting physics going on at the interface between the two so even creating a microscopic warp bubble in a lab would be useful. Might even be doable with just fusion reactor power.

<addendum> IIRC another solution to the negative energy problem unfortunately was solved but only for sublight speeds. However it did incidentally alter the time flow within the bubble: the stasis field in Red Dwarf, accelerated crop growth...
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Islander
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PostPosted: 23:55 - 16 May 2021    Post subject: Reply with quote

Easy-X wrote:
ppl have looked at the equations to try and drop the negative energy requirement and they recently managed it. You still need the equivalent energy output of a star but in relative terms that's more manageable than creating negative energy Laughing

https://newatlas.com/physics/ftl-warp-drive-no-negative-energy/

So maybe it'll be called a Lentz Drive Smile

I still think there's some mileage in the sailing analogy. The topology of warp bubbles and the "normal" universe are considered as separate things. I suspect there'll be some interesting physics going on at the interface between the two so even creating a microscopic warp bubble in a lab would be useful. Might even be doable with just fusion reactor power.

<addendum> IIRC another solution to the negative energy problem unfortunately was solved but only for sublight speeds. However it did incidentally alter the time flow within the bubble: the stasis field in Red Dwarf, accelerated crop growth...


It's highly theoretical rather than a solution...

It also doesn't solve the problem of that wavefront of infinitely blue shifted radiation about to sterilise the destination system Wink
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Easy-X
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PostPosted: 00:38 - 17 May 2021    Post subject: Reply with quote

Islander wrote:
It also doesn't solve the problem of that wavefront of infinitely blue shifted radiation about to sterilise the destination system Wink


That one get's filed under "someone else's problem" Laughing
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yen_powell
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PostPosted: 09:37 - 17 May 2021    Post subject: Reply with quote

Islander wrote:


It's highly theoretical rather than a solution...

It also doesn't solve the problem of that wavefront of infinitely blue shifted radiation about to sterilise the destination system Wink
Those sneaky aliens will probably have a giant mirror pointed right back at us now you've warned them. They are bound to be members here.
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Fat Angry Scotsman
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PostPosted: 12:28 - 17 May 2021    Post subject: Reply with quote

I love theoretical physics but sometimes I come across topics where I am struggling to get on track with the logic. I am currently reading about the Einstein Podolsky Rosen paradox:

https://www.drchinese.com/David/EPR.pdf

I wish I had went into this field as an undergraduate instead of Engineering as it's infinitely more interesting but I would have probably hit my intellectual glass ceiling in there somewhere.
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hellkat
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PostPosted: 18:34 - 19 May 2021    Post subject: Reply with quote

yen_powell wrote:
Those sneaky aliens will probably have a giant mirror pointed right back at us now you've warned them. They are bound to be members here.


I've always had my suspicions about that Ste Shifty
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Easy-X
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PostPosted: 00:12 - 20 May 2021    Post subject: Reply with quote

Fat Angry Scotsman wrote:
I love theoretical physics but sometimes I come across topics where I am struggling to get on track with the logic. I am currently reading about the Einstein Podolsky Rosen paradox:

https://www.drchinese.com/David/EPR.pdf

I wish I had went into this field as an undergraduate instead of Engineering as it's infinitely more interesting but I would have probably hit my intellectual glass ceiling in there somewhere.


Given the year (1935) I find the language used interesting... in that it's not interesting! The style of writing in physical papers doesn't seemed to have changed much in the last century Smile

Strange that the concept of "measuring a system disturbs a system" is pretty much a given these days but back then it must have been all new and fresh Very Happy
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thx1138
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PostPosted: 12:13 - 20 May 2021    Post subject: Re: Space and Time Reply with quote

struan80 wrote:
Seriously?

I've been trying to get my head around it all night. No success in getting the concept. Relativity and special relativity.

Is everything just a 1 or a 0. Is it both at the same time?

What is infinity?

What is nothing?

Can there be infinite density?

Heads minced.

Discuss


https://www.youtube.com/watch?v=AG7txWrqkrI

Laughing
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Easy-X
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PostPosted: 01:01 - 23 May 2021    Post subject: Reply with quote

I was reading an article on dethroning Einstein's General Theory of Relativity. As an aside it seems the assumption lately is that Quantum Theory is "correct" and Einstein is wrong (much the same as the patent clerk stole Newton's apple previously) but I rarely hear the other argument Thinking

Anyhoo, String Theory was shot down instantly due to the need for extra dimensions for the maths to work. Now I've always thought that higher dimensions make a lot of sense: it's not that a particle is in two places at once until you resolve it by measuring but that it lives elsewise and "protrudes" into the limited dimensions we experience in multiple places. Probably not fact or proven anywhere but if light "lives" as a wave in higher dimensions it will touch our dimensions at points we measure. The wave is going through both slits of classic experiment at once but we can only see the peaks. Obviously not as simple as that but hey, multidimensional physics either requires at least a doctorate or LSD to comprehend Smile

Moving on from there Loop Quantum Gravity suggests that the fabric of space-time literally is a fabric and there's tiny (as in Planck's Constant tiny) loops - something poetic about it. Certain long distance Gamma Ray bursts are anomalous and LQG seems to have the answer.

And finally the most overt "fuck you, old man" was Einstein's thought that deep, empty space was uniform. Nope, empty space literally is empty. Of course if you went out to check you'd bring your own space-time with you from the mass/energy/space/time distortion of the space ship itself Shocked It has a certain "if a tree falls in a forest..." quality about it but it does have some interesting ideas on how quantum entanglement works. Something about "locality" which I need to read up on.
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Islander
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PostPosted: 11:49 - 23 May 2021    Post subject: Reply with quote

And yet every test of Einstein's theories has stood and further proved the theories are correct at the macro scale at least. We use them for working systems and nothing's failed yet.

String theory hasn't actually reached any level of proof as yet and neither has quantum loop gravity. There's definitely more to discover - I think the standard particle model might be the first to fall.

As to whether we'll ever achieve a true understanding of the quantum level...
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Ribenapigeon
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PostPosted: 17:01 - 28 May 2021    Post subject: Reply with quote

All matter wants to be in the same place at the same time. That's it.
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Easy-X
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PostPosted: 21:44 - 28 May 2021    Post subject: Reply with quote

The reconciliation of General Relativity and Quantum Mechanics seems important, yes?

Let's start with E = mc2

Is this statement true?

What the letters represent and their underlying values is neither here nor there as actually the question should really be "can we use mathematics to prove things?"

And the answer to that is "yes and no." Yes you can prove things but only if you accept unprovable axioms. And there's the clever thing with mathematics: you can use it to prove that you can't prove everything with mathematics Shocked

A description of Quantum Mechanics that fits with General Relativity or visa versa a modified form of GR that is consistent with QM might not be possible not because it's an unsolvable problem but because it might not be solvable mathematically Thinking
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hellkat
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PostPosted: 22:27 - 28 May 2021    Post subject: Reply with quote

I need to go back to Mathematics 101, Donald in MathMagic Land Wub

https://www.youtube.com/watch?v=U_ZHsk0-eF0
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