Science!! Fucking magnets, how do they work?

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AngryGerbil

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Someone stab Furry in his tail and tell him the pain he feels is false because it cannot be directly detected by any mechanical instrument known to man and can only indirectly inferred via biological processes and audible waves of percussion permeating through the molecules of the air that come to our ears as a the weeps and wails of a gigantic bipedal raccoon. We are eternal and Pain, like Edge's Separation, is an illusion.
 

Furry

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Me a raccoon? No thanks. predators or get out.

Also, you seem to be omitting the part where machines that read these signals like already exist man.
 

Furry

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Yea it was mainly the "we should have detected them by now but have not" part.
Gravity wave events have different intensities, and different directions of propagation. We've increased the number of facilities to eliminate the directional part of the problem. That mostly leaves the intensity part of the equation. We're at a point where we should randomly be detecting events once a month or so, and for around the last decade we were at the point where events were expected yearly. Perhaps the equipment is even more sensitive than when I last checked. Either way, we've run machines a long time, expecting to see something, and there has been absolutely no positive readings. Gravitational waves are very close to being observationally eliminated as a theory. It would be a HUGE blow to some aspects of general relativity, specifically the belief that gravity is limited by the speed of light. Without gravity waves, its really REALLY hard to justify mathematically how gravity could be anything but instantaneous action.

It'll be interesting to see if science gives up on that aspect or decide to buy into one of the ultra crazy mathematical theories of how it could work.
 

hodj

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For clarification, are you saying "We should have evidence for X, but we have no evidence for X, therefore X absolutely does not exist" or are you saying "We should have evidence for X, but we have no evidence for X, therefore I withhold judgement and choose not to believe in X until more evidence comes to light"?

One of these statements is a textbook logical fallacy, the other is not.

Regardless, you're not going to see physics give up QE/QM anytime soon due to a lack of being able to detect gravitational waves directly, because they can detect them in other ways, and demonstrate their existence mathematically, and that's actually all they really need.

We don't visually observe speciation very often, particularly radical speciation, yet we know it exists mathematically via genetic evidence, and fossil evidence, etc.
 

Ambiturner

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Gravity wave events have different intensities, and different directions of propagation. We've increased the number of facilities to eliminate the directional part of the problem. That mostly leaves the intensity part of the equation. We're at a point where we should randomly be detecting events once a month or so, and for around the last decade we were at the point where events were expected yearly. Perhaps the equipment is even more sensitive than when I last checked. Either way, we've run machines a long time, expecting to see something, and there has been absolutely no positive readings.Gravitational waves are very close to being observationally eliminated as a theory.It would be a HUGE blow to some aspects of general relativity, specifically the belief that gravity is limited by the speed of light. Without gravity waves, its really REALLY hard to justify mathematically how gravity could be anything but instantaneous action.

It'll be interesting to see if science gives up on that aspect or decide to buy into one of the ultra crazy mathematical theories of how it could work.
Yeah, that's not even close to true. There are a lot of reasons we haven't directly detected gravitational waves, but them not existing is one of the most unlikely reasons. The idea that it's "close to being eliminated" as a theory is ridiculous.
 

Lendarios

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For clarification, are you saying "We should have evidence for X, but we have no evidence for X, therefore X absolutely does not exist" or are you saying "We should have evidence for X, but we have no evidence for X, therefore I withhold judgement and choose not to believe in X until more evidence comes to light"?

One of these statements is a textbook logical fallacy, the other is not.
Stop it Trebek. If you don't have evidence of X, of any way shape or form, not believing on X, is natural and logical, after all there is no evidence of it.
 

hodj

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Stop it Trebek. If you don't have evidence of X, of any way shape or form, not believing on X, is natural and logical, after all there is no evidence of it.
Can I get "Agreeing with exactly what I said but pretending like I said something you disagree with" for $500, Alex?

Or, alternatively

Can I get "Still not comprehending the difference between a claim of absolute knowledge and a claim of belief" for $200, Alex?
 

Lendarios

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At least be consistent hojd, you just turned 180, when I said...

You got him backwards, he is making the claim that it doesn't exists. Physical observation is enough.

Example, there were no rubber duckies in the Paleolithic period. My test is we have not found any rubber duckies, so until we find one rubber duck, my statement is true.
 

hodj

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You got him backwards, he is making the claim that it doesn't exists.
And if he is making a claim to absolute knowledge that gravity waves do not exist, because they have not yet been physically observed directly, then he is committing a logical fallacy of argument from ignorance.

And that is exactly what I said.

Please read better.

For clarification, are you saying "We should have evidence for X, but we have no evidence for X, therefore X absolutely does not exist" or are you saying "We should have evidence for X, but we have no evidence for X, therefore I withhold judgement and choose not to believe in X until more evidence comes to light"?

One of these statements is a textbook logical fallacy, the other is not.
If it is the case that he chooses not to believe in gravity waves until evidence sufficient to meet his burden of proof is met, then he is not making a fallacy appeal. But if he is saying that he knows for a fact gravity waves do not exist because we haven't detected them directly yet and should have, then he is making an appeal to a fallacy.

I can't make this any clearer for you.
 

Cad

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lendarios is missing the subtlety of what you're saying hodj, ESL at work
 

hodj

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Possibly but he agrees with me in the race thread so Im gonna cut him some slack for awhile.

tongue.png
 

Furry

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Yeah, that's not even close to true. There are a lot of reasons we haven't directly detected gravitational waves, but them not existing is one of the most unlikely reasons. The idea that it's "close to being eliminated" as a theory is ridiculous.
The only reason the machines wouldn't work is either A: the theory is wrong, or B: No natural events that are detectable have occurred. Do you have an alternative explanation? Almost every scientist agrees the machine should work according to theory. So do you think they just fucked up? What possible alternative explanation do you have that isn't quackery.
 

hodj

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You create a classic false dichotomy fallacy, and then shift burden of proof again, and then appeal to the authority of "almost every (unnamed) scientist" for a third fallacy cherry on top.

There is at least two alternatives, which is that the machines were not sensitive enough, or that gravitational waves function in ways different from what was predicted.

Which would not mean the theory was wrong, but rather that some parts of the theory need to be modified somewhat.

What are gravitational waves?

So what are these things and how can we detect them?

First, a quick review. Mass causes a warp in space and time. The sun's "gravity" isn't a pulling force, it's really an indentation that the sun causes in the space around itself.

Planets think they're moving in a straight line, but they're actually pulled into a circle while traveling through this warped spacetime. Go home planets, you're drunk.

The idea is when mass moves or changes, Einstein said that there should be gravitational ripples produced in spacetime.

Our problem is that the size and effect of gravitational waves is incredibly small. We need to find the most catastrophic events in the universe if we hope even detect them.

A supernova detonating asymmetrically, or two supermassive black holes orbiting each other, or a Galactus family reunion; are the magnitude of events we're looking for.

The most serious attempt to detect gravitational waves is the Laser Interferometer Gravitational-Wave Observatory, or LIGO detector, in the United States. It has two facilities separated by 3000 km. Each detector carefully watches for any gravitational waves passing through by the length of time it takes for laser pulses to bounce within a 4km long sealed vacuum.

If a gravitational wave is detected, the two observatories use triangulation to determine its magnitude and direction. At least, that was the plan from 2002 to 2010. The problem was, it didn't detect any gravitational waves for its entire run.

But hey, this is a job for science. Unbowed, the steely-eyed researchers rebuilt the equipment, improving its sensitivity by a factor of 10. This next round starts in 2015.
So basically, the first round of instruments failed so they've rebuilt it and only just started testing again at a much higher sensitivity.

https://www.advancedligo.mit.edu/

LIGO Hanford's H1 detector began achieving lock stretches of more than two hours early in February 2015 with all of the detector's core control systems engaged. LIGO commissioners will now undertake a program of optimization and noise-hunting to move H1 forward in sensitivity as LIGO continues to plan for the first data run of the advanced detector era in Fall 2015, a run named O1 (Observation Run 1).
And those tests have only just begun, or will begin soon.

LSC News

18 September 2015 -- The first Observing Run of Advanced LIGO, called O1, started on September 18, 2015. During the run, the LIGO detectors in Hanford and Livingston will be simultaneously collecting data. The run is planned to last three months. It will provide LIGO researchers with long-awaited new data to continue their quest to directly detect cosmic gravitational waves. Already three times more sensitive than initial LIGO, the Advanced LIGO detectors will be fine-tuned in the next months to increase the sensitivity 10 times compared with the initial LIGO. This will allow the scientists to detect gravitational waves generated as far away as several hundred millions of light years. - See more at:LSC News
The system has been in operation for 12 days.

12 DAYS
 

hodj

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Further, according to this article interviewing some of the fellows that have directed the LIGO project

Gravitational wave detection likely within five years, according to researcher

Q: How did LIGO get started?
BARISH:Einstein didn't think that gravitational waves could ever be detected, because gravity is such a weak force.But in the 1960s, Joseph Weber at the University of Maryland turned a metric ton of aluminum into a bar 153 centimeters long. The bar naturally rang at a frequency of about 1,000 Hertz. A collapsing supernova should produce gravitational waves in that frequency range, so if such a wave passed through the bar, the bar's resonance might amplify it enough to be measurable. It was a neat idea, and basically initiated the field experimentally. But you can only make a bar so big, and the signal you see depends on the size of the detector.
Einstein, in constructing his theory, didn't even think it was possible to detect them. It wasn't until the 60s that people began to think it might be possible.

And the former director of the LIGO project says in the same article he believes they'll be detected within the next 5 years.

BARISH: I've always had the fond wish that we'd do it by 2016, which is the hundredth anniversary of Einstein's theory. Advanced LIGO may take three to five years to reach the designed sensitivity, but we'll be taking data along the way, so the probability of a detection will be continually increasing. Our sensitivity is designed to improve by a factor of 10 to 20, and a factor of 10 increases the detection probability by a factor of 1,000. The sensitivity tells you how far out you can see, and volume increases with the cube of the distance.

When we started this back in 1989, some people were a bit skeptical, saying maybe it's a little bit like fusion. They always say fusion is "50 years away." With LIGO the common lore is we are 10 years away from detecting gravitational waves. I would say that it's not 10 years any longer. It's probably within five.
Maybe he's right, maybe he's wrong, but the fact that Einstein felt like it may not be possible to detect them because they are so weak completely undermines your position that because we can't detect them, they don't exist.

One more interesting fact

3. The Hulse-Taylor Pulsar - Evidence of Gravitational Waves

3. The Hulse-Taylor Pulsar - Evidence of Gravitational Waves
In this current "pre-detection" era it can be difficult to convince those who are not overly familiar with the theory of general relativity that gravitational waves really do exist. Fortunately, the Hulse-Taylor Pulsar (PSR 1913+16) provides firm evidence of a binary system actually emitting gravitational waves!

In 1974 Russell Hulse and Joseph Taylor discovered the signal of a pulsar using the Arecibo radio telescope. The pulsar had a period of 59 milliseconds. Further measurements showed that the orbital period varied in a repetitive manner over a period of 7.75 hours. This meant the the pulsar must be in orbit with another star.

Over the years the period of the pulsar has been measured to high accuracy. General relativity tells us that a binary system will emit energy as gravitational waves and eventually the two objects will inspiral towards each other and merge. As the system evolves towards this merger the period of the orbit will gradually decrease.
rrr_img_111465.jpg


The figure (from Weisberg and Taylor (2004)) shows the cumulative shift of periastron time for PSR 1913+16. This shows the decrease of the orbital period as the two stars spiral together. Although the measured shift is only 40 seconds over 30 years, it has been very accurately measured and agrees precisely with the predictions from Einstein's theory of General Relativity. The observation is regarded as indirect proof of the existence of gravitational waves. Indeed, the Hulse-Tayor pulsar is deemed so significant that in 1993 its discoverers were awarded the Nobel prize for their work.
I believe we can put this issue to rest at this point.
 

Ambiturner

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The only reason the machines wouldn't work is either A: the theory is wrong, or B: No natural events that are detectable have occurred. Do you have an alternative explanation? Almost every scientist agrees the machine should work according to theory. So do you think they just fucked up? What possible alternative explanation do you have that isn't quackery.
Those are not the only 2 possibilities and if you really believe they are then your understanding of the subject is much less than I thought.

A lot of people have claimed GR was wrong and they knew better, every single one of them has been proven wrong.
 

Furry

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Those are not the only 2 possibilities and if you really believe they are then your understanding of the subject is much less than I thought.

A lot of people have claimed GR was wrong and they knew better, every single one of them has been proven wrong.
I'm not saying GR is wrong, many parts of it appear to be very true and have been quite experimentally verified enough that doubting them is wrong. That's really just an attempt at deflection. I am talking about and only about gravity waves specifically in this situation.

What other alternatives are there from the machine not working, the theory being wrong, or there having been no events to detect? What possible alternate explination for the failure is there. You said a couple, but I'lll accept one example.
 

hodj

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You were given it: The machines weren't sensitive enough.

They built more sensitive equipment (1000x more sensitive) and have just begun new tests that will take 5 years to complete.