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  #1981  
Old 07.10.2020, 15:55
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Re: Ask a Scientist

Looks interesting, who'd a thunk we could find evidence in the night sky for previous editions of our universe?

It's just a preprint at the moment, i.e. not appeared in a peer-reviewed journal, although given Sir Roger's brand new Nobel prize, it is unlikely to be thrown out. On the other hand he has had some pretty wacky ideas that have not been accepted, so we'll have to wait and see.
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  #1982  
Old 07.10.2020, 16:12
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Re: Ask a Scientist

In the last addition of our universe in the 70's I was an undergraduate studying biochemistry and thoroughly unimpressed by the physics department in Glasgow looking for gravitational waves. Like quarks and neutrinos, these seemed to be figments of highly intelligent imaginations. Nowadays it is Biggs Hosons. I am waiting for the remote control that uses any of these particles.
The background microwave radiation might exist, but all the speculation as to what it means...............
Oh, and those gravitational waves, I understand the search is still on -give me a virus any day
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  #1983  
Old 07.10.2020, 16:31
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Re: Ask a Scientist

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In the last addition of our universe in the 70's I was an undergraduate studying biochemistry and thoroughly unimpressed by the physics department in Glasgow looking for gravitational waves. Like quarks and neutrinos, these seemed to be figments of highly intelligent imaginations. Nowadays it is Biggs Hosons. I am waiting for the remote control that uses any of these particles.
The background microwave radiation might exist, but all the speculation as to what it means...............
Oh, and those gravitational waves, I understand the search is still on -give me a virus any day
Albert Einstein predicted the existence of gravitational waves in 1916 in his general theory of relativity and so far this theory has stood up to the test of time far better than most, or all, other major physical theories
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  #1984  
Old 07.10.2020, 17:25
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Re: Ask a Scientist

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Oh, and those gravitational waves, I understand the search is still on -give me a virus any day
You understand wrong. The LIGO detector has found several unequivocal signals of gravitational waves over the last few years. A triumph of physics.

https://en.wikipedia.org/wiki/Gravitational_wave.
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  #1985  
Old 07.10.2020, 20:36
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Re: Ask a Scientist

Maybe I chose the wrong target, I was not aware of the LIGO experiments, but I like this quote from

https://blogs.scientificamerican.com...orth-the-cost/

I also find LIGO thrilling in part because it has no practical benefits. It is a manifestation of one of our most admirable attributes, the desire for knowledge not as a means to an end—like power, prosperity or health--but simply for its own sake. No science is “pure,” but LIGO comes close.

In a recent post, I said that “physics desperately needs not new ideas but new facts. Discoveries, not inventions. Ideally, physicists will stumble on something so startling that they abandon their pursuit of multiverses, strings and other fantasies and return to reality.”
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  #1986  
Old 07.10.2020, 21:28
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Re: Ask a Scientist

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Maybe I chose the wrong target, I was not aware of the LIGO experiments, but I like this quote from

https://blogs.scientificamerican.com...orth-the-cost/

I also find LIGO thrilling in part because it has no practical benefits. It is a manifestation of one of our most admirable attributes, the desire for knowledge not as a means to an end—like power, prosperity or health--but simply for its own sake. No science is “pure,” but LIGO comes close.

In a recent post, I said that “physics desperately needs not new ideas but new facts. Discoveries, not inventions. Ideally, physicists will stumble on something so startling that they abandon their pursuit of multiverses, strings and other fantasies and return to reality.”
Labelling serious scientific research as "abandon their pursuit of multiverses, strings and other fantasies" is a Trumpian approach to science by labelling things one does not understand as "fantasies".

About "I also find LIGO thrilling in part because it has no practical benefits." is premature because nobody knows what the future will bring.

The current LIGO detection technology is based on Glasgow’s pioneering work.

People said quantum research had no practical benefits; now how many of us have benefited from an MRI scan as just one example of the benefits?
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  #1987  
Old 08.10.2020, 08:17
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Re: Ask a Scientist

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Labelling serious scientific research as "abandon their pursuit of multiverses, strings and other fantasies" is a Trumpian approach to science by labelling things one does not understand as "fantasies".
I don't understand a lot of heavy mathematical physics or relativity, but not sure a comparison with Trump is fair.
A criticism of some of modern physics comes from much better minds than mine e.g. Lee Smolin. and others.
What I really object to is the totally speculative stuff on multiverses, big bangs and dark matter/energy. It might be fun speculation, but that is all it is at the moment, speculation with little hard evidence.
Hidden energy, a moment of creation - these ideas seem to appeal to those of a religous conviction.
Multiple universes have a validity in terms of the "bubble" that each individual lives in but that is not what physicists mean by the term.
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  #1988  
Old 08.10.2020, 11:23
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Re: Ask a Scientist

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What I really object to is the totally speculative stuff on multiverses, big bangs and dark matter/energy. It might be fun speculation, but that is all it is at the moment, speculation with little hard evidence.
Carl Sagan and Stephen Hawking must be reeling in their graves
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  #1989  
Old 08.10.2020, 13:22
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Re: Ask a Scientist

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Carl Sagan and Stephen Hawking must be reeling in their graves
Yes, quite
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  #1990  
Old 08.10.2020, 13:52
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Re: Ask a Scientist

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I don't understand a lot of heavy mathematical physics or relativity, but not sure a comparison with Trump is fair.
A criticism of some of modern physics comes from much better minds than mine e.g. Lee Smolin. and others.
What I really object to is the totally speculative stuff on multiverses, big bangs and dark matter/energy. It might be fun speculation, but that is all it is at the moment, speculation with little hard evidence.
Hidden energy, a moment of creation - these ideas seem to appeal to those of a religous conviction.
Multiple universes have a validity in terms of the "bubble" that each individual lives in but that is not what physicists mean by the term.
Lee Smolin is an American theoretical physicist specialising in quantum mechanics and has not criticised modern physics as such. He has criticised some theories like the string theory but only because he supports the competing theory of loop quantum gravity, which is no less complex or esoteric.
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  #1991  
Old 12.10.2020, 14:48
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Re: Ask a Scientist

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I don't understand a lot of heavy mathematical physics or relativity, but not sure a comparison with Trump is fair.
A criticism of some of modern physics comes from much better minds than mine e.g. Lee Smolin. and others.
Yup.

But a lot of press coverage of modern physics comes from people who don't really understand the concepts they are reporting on, and just go for the soundbytes. For example spectacularly claiming that some theory has been disproven or thrown out or totally re-written, and our understanding of physics turned on its head, when in fact some minute detail of the theory has been adjusted or some minor parameter added or verified or maybe even discarded.
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  #1992  
Old 19.10.2020, 08:06
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Re: Ask a Scientist

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Yup.

But a lot of press coverage of modern physics comes from people who don't really understand the concepts they are reporting on, and just go for the soundbytes. For example spectacularly claiming that some theory has been disproven or thrown out or totally re-written, and our understanding of physics turned on its head, when in fact some minute detail of the theory has been adjusted or some minor parameter added or verified or maybe even discarded.
New Scientist does sound bytes -all those headlines on parallel universes, no free will etc.
Just reading "A different Universe- reinventing physics from the bottom down" by Robert Laughlin for the third time -my understanding gets better with every reading. He is not into adjusting parameters.
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  #1993  
Old Yesterday, 00:07
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Re: Ask a Scientist

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Carl Sagan and Stephen Hawking must be reeling in their graves
...I spent time to read this two to find the so called new physics...all them writings you can compare as an dog trying to catch his tail...the real physics died after Einstein's law of energy conservation...i don't saying that physics stops completely is just sound more like engineering...now is more philosophy and unproven theory than physics...
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  #1994  
Old Yesterday, 01:50
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Re: Ask a Scientist

If you follow all the Covid-19 precautions religiously to the letter, can you still catch a cold?
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  #1995  
Old Yesterday, 08:31
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Re: Ask a Scientist

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...I spent time to read this two to find the so called new physics...all them writings you can compare as an dog trying to catch his tail...the real physics died after Einstein's law of energy conservation...i don't saying that physics stops completely is just sound more like engineering...now is more philosophy and unproven theory than physics...
I think you might be basing your conclusions on popular science articles, rather than actual scientific works. Physics has advanced tremendously in the past 100 years. Think superconductors, quantum computing, quantum chromodynamics, the gigantic expansion and understanding of the standard model, insane progress in experimental fields such as colliders and ultra colliders that lead the way in our understanding of high-energy physics (that opened up the current discussions about stellar nucleosynthesis)...the list is too long.

BTW, you may want to re-examine your definition of "unproven theory".
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  #1996  
Old Yesterday, 08:53
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Re: Ask a Scientist

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If you follow all the Covid-19 precautions religiously to the letter, can you still catch a cold?
Those precautions don't include, for example, disinfecting your knife and fork before you use it when you eat at a restaurant and you've no idea whether the person who set the table washed their hands first.

So I suppose it doesn't matter who careful you are yourself - when you interact with others, there is always risk.
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  #1997  
Old Yesterday, 09:26
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Re: Ask a Scientist

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If you follow all the Covid-19 precautions religiously to the letter, can you still catch a cold?
Yes. All the guidance is about reducing risk, not eliminating it which is impossible.
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  #1998  
Old Yesterday, 11:14
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Re: Ask a Scientist

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..i don't saying that physics stops completely is just sound more like engineering...now is more philosophy and unproven theory than physics...
This is indeed a real situation. I think the biggest difference here is the concept of fundamental scientific research vs. Inventions and application of novel ideas which directly affect (hopefully improve) humankind.

Of course you cannot have the latter without the former, and the former is the well and source of new engineered inventions.

One can see this through Educational Institutions. My old Uni, a proud engineering school has stricken many programs which were historical engineering pillars (Textile Engineering, Steel Engineering, Electrical Engineering). The new research of these topics are now found in Engineering Chemistry, Engineering Physics, Computer/Software Engineering etc.

The day-to-day task education in these older fields have moved over to community college or trade schools.
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  #1999  
Old Yesterday, 13:27
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Re: Ask a Scientist

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...I spent time to read this two to find the so called new physics...all them writings you can compare as an dog trying to catch his tail...the real physics died after Einstein's law of energy conservation...i don't saying that physics stops completely is just sound more like engineering...now is more philosophy and unproven theory than physics...
Not sure that there have not been some really good physicists around after Einstein, but this in general is the point I was trying to make. Materials scientists have got their feet on the ground and theory is useful in as much that it is not only intellectually satisfying, but also will help in developing new products and technologies.
Physics, when it starts to talk about a theory of everything, ultimate answers, God particles etc is losing credibility as a science.
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  #2000  
Old Yesterday, 13:50
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Re: Ask a Scientist

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i don't saying that physics stops completely is just sound more like engineering...now is more philosophy and unproven theory than physics...
You mention Einstein, but perhaps fail to realise that most of what he did was exactly that - unproven theory - for many years, some of it until some time after his death, some of it remaing so to this day.

It was always thus.

The only issue you're seeing, I suspect, is that some of the older 'unproven theories' have been around so long, and your own education level has allowed you to think you understand them (not that I'm saying you don't), whereas the "new physics" you mention is still new and much of it unproven, nearly all of it at a level of complexity that makes it almost impossible for you or I to pretend that we understand it.

It was always thus.
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