Ik ben natuurlijk maar een leek, maar uit het filmpje maak ik op:quote:Op maandag 1 juni 2009 18:43 schreef Haushofer het volgende:
Hoe kan de LHC dan precies de snaartheorie experimentele onderbouwing geven (buiten supersymmetrie om)?
Zit je ons nou uit te dagen?quote:Op maandag 1 juni 2009 18:43 schreef Haushofer het volgende:
Hoe kan de LHC dan precies de snaartheorie experimentele onderbouwing geven (buiten supersymmetrie om)?
Nee, ik ben daar serieus benieuwd naar, überhaupt naar concrete experimenten die aspecten van de snaartheorie blootleggen.quote:
quote:Op maandag 1 juni 2009 19:14 schreef JJ.Johnson het volgende:
[..]
Ik ben natuurlijk maar een leek, maar uit het filmpje maak ik op:
De deeltjes botsen. Ze spatten uit elkaar. De restanten zouden normaal logischerwijs hetzelfde gewicht hebben, bij elkaar opgeteld, als de deeltjes voordat ze botsten. Als dat gewicht niet hetzelfde is, wil dat zeggen dat een deel van de materie mist. Die is dan, volgens deze theorie, 'naar een andere dimensie "geknald" '. Ik hoop niet dat ik rare dingen zeg, maar zo begrijp ik het uit dit filmpje
Edit: Beetje slecht gelezen. Wat ik hierboven zeg is dus die supersymmetrie waarschijnlijk.![]()
bronquote:GENEVE - De grootste deeltjesversneller ter wereld, die bij de grens van Zwitserland en Frankrijk onder de grond ligt, gaat in november van start. Dat heeft het CERN, het instituut achter het wetenschappelijke apparaat, donderdag bekendgemaakt.
quote:[...]
Then it will be time to test one of the most bizarre and revolutionary theories in science. I’m not talking about extra dimensions of space-time, dark matter or even black holes that eat the Earth. No, I’m talking about the notion that the troubled collider is being sabotaged by its own future. A pair of otherwise distinguished physicists have suggested that the hypothesized Higgs boson, which physicists hope to produce with the collider, might be so abhorrent to nature that its creation would ripple backward through time and stop the collider before it could make one, like a time traveler who goes back in time to kill his grandfather.
[...]
Holger Bech Nielsen, of the Niels Bohr Institute in Copenhagen, and Masao Ninomiya of the Yukawa Institute for Theoretical Physics in Kyoto, Japan, put this idea forward in a series of papers with titles like “Test of Effect From Future in Large Hadron Collider: a Proposal” and “Search for Future Influence From LHC,” posted on the physics Web site arXiv.org in the last year and a half.
[...]
“It must be our prediction that all Higgs producing machines shall have bad luck,” Dr. Nielsen said in an e-mail message. In an unpublished essay, Dr. Nielson said of the theory, “Well, one could even almost say that we have a model for God.” It is their guess, he went on, “that He rather hates Higgs particles, and attempts to avoid them.”()
quote:Dr. Nielsen is well-qualified in this tradition. He is known in physics as one of the founders of string theory and a deep and original thinker, “one of those extremely smart people that is willing to chase crazy ideas pretty far,” in the words of Sean Carroll, a Caltech physicist and author of a coming book about time, “From Eternity to Here.”
Op zich geen lichtgewicht dusquote:Holger Bech Nielsen (born 25 August 1941) is a Danish theoretical physicist, professor at the Niels Bohr Institute, at the University of Copenhagen, where he started studying physics in 1961.
Holger Bech Nielsen has made original contributions to theoretical particle physics specifically in the field of string theory. Independently of Nambu and Susskind, he was the first to propose that the Veneziano model was actually a theory of strings and this is why he is considered among the fathers of string theory. He was awarded the highly esteemed Humboldt Prize in 2001 for his scientific research. Several nuclear physics concepts are named after him, e.g. Nielsen-Olesen Vortex and the Nielsen-Ninomiya no-go theorem for representing chiral fermions on the lattice. He is known in Denmark for his enthusiastic public lectures on physics, his latest being at University of Southern Denmark in Odense (March 10, 2005), Kulturhuset i Skanderborg (January 26, 2006), at EUCVest in Esbjerg (March 21, 2006), and at Regensen in Copenhagen (April 12, 2006). In July 2008 he lectured for children at the summer camp for the Danish Association of Gifted Children
quote:There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another which states that this has already happened.
Klopt. Ik heb professor Nielsen meegemaakt in Kopenhagen afgelopen april, en hij maakte een nogal verwarde indruk. Hij heeft zeker zijn sporen verdiend in de natuurkunde, maar toen hij dat praatje hield voor een volle zaal zaten nogal wat mensen zich af te vragen wat de beste man nou precies aan het doen was (iets met de separeerbaarheid van Hilbertruimtes in snaartheorie om interacties via vrije veldentheorieën te beschrijven oid).quote:Op woensdag 14 oktober 2009 11:14 schreef thabit het volgende:
De man is al aardig op leeftijd, en bij sommigen kan het dan opeens hard achteruitgaan, helaas. In de wiskunde heb je ook wel mensen die ooit briljant waren maar nu alleen onzinbewijzen voor de Riemannhypothese produceren of andere vormen van seniliteit vertonen.
Volg je het zelf nog?quote:Op woensdag 14 oktober 2009 03:48 schreef CP69 het volgende:
meh , DAT artikel is ALLEEN gebaseerd op liniaire tijd ( tijd gezien als een lijn van punt a naar b)...
...echter ,
als tijd NIET iets lineair is , dus dat bij elke gebeurtenis/beslissing die je maakt naast zeg maar tijdlijn 1 een
afslpitsing onstaat en dan weer , enz, enz ... , dan zijn er dus een oneindig aantal parallelle tijdlinen.
dAN is er ook nog een theorie dat tijd misschien helemaal niet liniair of parallel loopt ....maar zoiets als
statisch(ALLES(verleden/heden/en toekomst gebeurt in het EEUWIGE NU) is volgens de kwantum-Mechanica .
Wij nemen maar een fractie van de werkelijke realiteit waar met onze gelimiteerde 5 zintuigen.
quote:Op dinsdag 16 september 2008 18:08 schreef UncleScorp het volgende:
Misschien wordt het wel een tijdmachine
Time-machine design made simpler
"Otherwise distinguished." Well, I have to admit that's a nice touch. Because this idea ain't distinguished. In fact if I had to bed I'd say it wasn't even serious. Physicist humor tends to run along these lines, and if the media latched onto it as though it were serious. I'm not entirely blaming the media, however. It's not as though the various popularizers of high-energy physics haven't done a thorough job of making the general public think physics consists entirely of acid-trip hippie speculations about superposed cats, strings, and some of the more bizarre interpretations of entanglement. (You know who you are.)quote:...Then it will be time to test one of the most bizarre and revolutionary theories in science. I'm not talking about extra dimensions of space-time, dark matter or even black holes that eat the Earth. No, I'm talking about the notion that the troubled collider is being sabotaged by its own future. A pair of otherwise distinguished physicists have suggested that the hypothesized Higgs boson, which physicists hope to produce with the collider, might be so abhorrent to nature that its creation would ripple backward through time and stop the collider before it could make one, like a time traveler who goes back in time to kill his grandfather.
The standard model rules almost all physics? I've never used it, neither has anyone else in my (AMO) research group. The standard model is currently the most fundamental low-level description of the universe that we yet have, but most physics is in no sense reliant on it any more than you are reliant on knowledge of the internals of the Bureau of Engraving and Printing when you use cash. If the whole thing turns out to need major revision (as well it might), most physics will go on without a hiccup.quote:According to the so-called Standard Model that rules almost all physics, the Higgs is responsible for imbuing other elementary particles with mass...
This malign influence from the future, they argue, could explain why the United States Superconducting Supercollider, also designed to find the Higgs, was canceled in 1993 after billions of dollars had already been spent, an event so unlikely that Dr. Nielsen calls it an "anti-miracle."
Geeft je zeker een hadron!quote:
Is nu samengevoegd, vandaar wat overlap in de discussie.quote:Op woensdag 14 oktober 2009 02:58 schreef ExperimentalFrentalMental het volgende:
gelieve hier te plaatsen
De LHC deeltje 2
Ik moest lachen.quote:Op woensdag 14 oktober 2009 22:15 schreef oompaloompa het volgende:
[..]
Geeft je zeker een hadron!
ba doom tish
Ik had het net met wat collega's hierover, ook in het licht van bijvoorbeeld Lee Smolin's boek, het bericht van een aantal jaar geleden over een HBO'er die polynomen van willekeurige graad opeens exact kon oplossen of het bericht vorige week van de bijbelvertaling van Ellen van Wolde.quote:Op woensdag 14 oktober 2009 02:11 schreef jogy het volgende:
Leuk artikel van de New York Times.
Gat in de markt Haushofer!quote:Op donderdag 15 oktober 2009 12:23 schreef Haushofer het volgende:
Onze conclusie was eigenlijk dat er kennelijk bar weinig goede wetenschapsjournalisten zijn.
Ja, daar heb ik serieus wel over nagedacht. Ook omtrent de berichtgeving over de LHC; ik kan me best ergeren aan al die flauwekul wat in populaire bladen en zelfs kranten staan.quote:
Ik heb er speciaal een plek aan gewijd! Wetenschapsjournalistiek met een kritisch oog bekeken.quote:Op donderdag 15 oktober 2009 13:28 schreef Haushofer het volgende:
[..]
Ja, daar heb ik serieus wel over nagedacht. Ook omtrent de berichtgeving over de LHC; ik kan me best ergeren aan al die flauwekul wat in populaire bladen en zelfs kranten staan.
Tot dan vervul ik mijn roeping hier op Fok!
quote:LHC gets colder than deep space
The Large Hadron Collider (LHC) experiment has once again become one of the coldest places in the Universe.
All eight sectors of the LHC have now been cooled to their operating temperature of 1.9 kelvin (-271C; -456F) - colder than deep space.
The large magnets that bend particle beams around the LHC are kept at this frigid temperature using liquid helium.
The magnets are arranged end-to-end in a 27km-long circular tunnel straddling the Franco-Swiss border.
The cool-down is an important milestone ahead of the collider's scheduled re-start in the latter half of November.
The LHC has been shut down since 19 September 2008, when a magnet problem called a "quench" caused a tonne of liquid helium to leak into the LHC tunnel.
After the accident, the particle accelerator had to be warmed up so that repairs could take place.
The most powerful physics experiment ever built, the Large Hadron Collider will recreate the conditions just after the Big Bang. It is operated by the European Organization for Nuclear Research (Cern), based in Geneva.
Two beams of protons will be fired down pipes running through the magnets. These beams will travel in opposite directions around the main "ring" at close to the speed of light.
At allotted points around the tunnel, the proton beams cross paths, smashing into one another with cataclysmic energy. Scientists hope to see new particles in the debris of these collisions, revealing fundamental new insights into the nature of the cosmos.
Awesome energy
The operating temperature of the LHC is just a shade above "absolute zero" (-273.15C) - the coldest temperature possible. By comparison, the temperature in remote regions of outer space is about 2.7 kelvin (-270C; -454F).
The LHC's magnets are designed to be "superconducting", which means they channel electric current with zero resistance and very little power loss. But to become superconducting, the magnets must be cooled to very low temperatures.
For this reason, the LHC is innervated by a complex system of cryogenic lines using liquid helium as the refrigerant of choice.
No particle physics facility on this scale has ever operated in such frigid conditions.
But before a beam can be circulated around the 27km-long LHC ring, engineers will have to thoroughly test the machine's new quench protection system and continue with magnet powering tests.
Particle beams have already been brought "to the door" of the Large Hadron Collider. A low-intensity beam could be injected into the LHC in as little as a week.
This beam test would involve only parts of the collider, rather than the whole "ring".
Officials now plan to circulate a beam around the LHC in the second half of November. Engineers will then aim to smash low-intensity beams together, giving scientists their first data.
The beams' energy will then be increased so that the first high-energy collisions can take place. These will mark the real beginning of the LHC's research programme.
Collisions at high energy have been scheduled to occur in December, but now look more likely to happen in January, according to Cern's director of communications James Gillies.
Feeling the squeeze
Mr Gillies said this would involve delicate operation of the accelerator.
"Whilst you're accelerating [the beams], you don't have to worry too much about how wide the beams are. But when you want to collide them, you want the protons as closely squeezed together as possible.
He added: "If you get it wrong you can lose beam particles - so it can take a while to perfect. Then you line up the beams to collide.
"In terms of the distances between the last control elements of the LHC and the collision point, it's a bit like firing knitting needles from across the Atlantic and getting them to collide half way."
Officials plan a brief hiatus over the Christmas and New Year break, when the lab will have to shut down.
Although managers had discussed working through this period, Mr Gillies said this would have been "too logistically complicated".
The main determinant in the decision to close over winter were workers' contracts, which would have needed to be re-negotiated, he said.
An upgraded early warning system, or quench protection system, should prevent incidents of the kind which shut the collider last year, officials say.
This has involved installing hundreds of new detectors around the machine.
Cern has spent about 40m Swiss Francs (£24m) on repairs following the accident, including upgrades to the quench protection system.
Bron: BBC.
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