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Javier E

Peter Higgs, physicist who discovered Higgs boson, dies aged 94 | Peter Higgs | The Gua... - 0 views

  • Peter Higgs, the Nobel prize-winning physicist who discovered a new particle known as the Higgs boson, has died.Higgs, 94, who was awarded the Nobel prize for physics in 2013 for his work in 1964 showing how the boson helped bind the universe together by giving particles their mass
  • “A giant of particle physics has left us,” Ellis told the Guardian. “Without his theory, atoms could not exist and radioactivity would be a force as strong as electricity and magnetism.
  • “His prediction of the existence of the particle that bears his name was a deep insight, and its discovery at Cern in 2012 was a crowning moment that confirmed his understanding of the way the Universe works.”
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  • The particle that carries his name is perhaps the single most stunning example of how seemingly abstract mathematical ideas can make predictions which turn out to have huge physical consequences.”
  • The Royal Swedish Academy of Sciences, which awards the Nobel, said at the time the standard model of physics which underpins the scientific understanding of the universe “rests on the existence of a special kind of particle: the Higgs particle. This particle originates from an invisible field that fills up all space.“Even when the universe seems empty this field is there. Without it, we would not exist, because it is from contact with the field that particles acquire mass. The theory proposed by Englert and Higgs describes this process.”
kushnerha

Physicists in Europe Find Tantalizing Hints of a Mysterious New Particle - The New York... - 1 views

  • seen traces of what could be a new fundamental particle of nature.
  • One possibility, out of a gaggle of wild and not-so-wild ideas springing to life as the day went on, is that the particle — assuming it is real — is a heavier version of the Higgs boson, a particle that explains why other particles have mass. Another is that it is a graviton, the supposed quantum carrier of gravity, whose discovery could imply the existence of extra dimensions of space-time.
  • At the end of a long chain of “ifs” could be a revolution, the first clues to a theory of nature that goes beyond the so-called Standard Model, which has ruled physics for the last quarter-century.
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  • noting that the history of particle physics is rife with statistical flukes and anomalies that disappeared when more data was compiled
  • A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned
  • Physicists could not help wondering if history was about to repeat itself. It was four years ago this week that the same two teams’ detection of matching bumps in Large Hadron Collider data set the clock ticking for the discovery of the Higgs boson six months later.
  • If the particle is real, Dr. Lykken said, physicists should know by this summer, when they will have 10 times as much data to present to scientists from around the world who will convene in Chicago
  • The Higgs boson was the last missing piece of the Standard Model, which explains all we know about subatomic particles and forces. But there are questions this model does not answer, such as what happens at the bottom of a black hole, the identity of the dark matter and dark energy that rule the cosmos, or why the universe is matter and not antimatter.
  • CERN physicists have been running their collider at nearly twice the energy with which they discovered the Higgs, firing twin beams of protons with 6.5 trillion electron volts of energy at each other in search of new particles to help point them to deeper laws.The main news since then has been mainly that there is no news yet, only tantalizing hints, bumps in the data, that might be new particles and signposts of new theories, or statistical demons.
  • Or it could be a more massive particle that has decayed in steps down to a pair of photons. Nobody knows. No model predicted this, which is how some scientists like it.
  • “The more nonstandard the better,” said Joe Lykken, the director of research at the Fermi National Accelerator Laboratory and a member of one of the CERN teams. “It will give people a lot to think about. We get paid to speculate.”
  • When physicists announced in 2012 that they had indeed discovered the Higgs boson, it was not the end of physics. It was not even, to paraphrase Winston Churchill, the beginning of the end.It might, they hoped, be the end of the beginning.
  • Such a discovery would augur a fruitful future for cosmological wanderings and for the CERN collider, which will be running for the next 20 years.
Javier E

Physicists in Europe Find Tantalizing Hints of a Mysterious New Particle - The New York... - 0 views

  • Two teams of physicists working independently at the Large Hadron Collider at CERN, the European Organization for Nuclear Research, reported on Tuesday that they had seen traces of what could be a new fundamental particle of nature.
  • One possibility, out of a gaggle of wild and not-so-wild ideas springing to life as the day went on, is that the particle — assuming it is real — is a heavier version of the Higgs boson, a particle that explains why other particles have mass. Another is that it is a graviton, the supposed quantum carrier of gravity, whose discovery could imply the existence of extra dimensions of space-time.
  • At the end of a long chain of “ifs” could be a revolution, the first clues to a theory of nature that goes beyond the so-called Standard Model, which has ruled physics for the last quarter-century.
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  • The Higgs boson was the last missing piece of the Standard Model, which explains all we know about subatomic particles and forces. But there are questions this model does not answer, such as what happens at the bottom of a black hole, the identity of the dark matter and dark energy that rule the cosmos, or why the universe is matter and not antimatter.
  • When physicists announced in 2012 that they had indeed discovered the Higgs boson, it was not the end of physics. It was not even, to paraphrase Winston Churchill, the beginning of the end.
  • A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned, saying that a lot more data was needed and would in fact soon be available
  • The Large Hadron Collider was built at a cost of some $10 billion, to speed protons around an 18-mile underground track at more than 99 percent of the speed of light and smash them together in search of new particles and forces of nature. By virtue of Einstein’s equivalence of mass and energy, the more energy poured into these collisions, the more massive particles can come out of them. And by the logic of quantum microscopy, the more energy they have to spend, the smaller and more intimate details of nature physicists can see.
  • Since June, after a two-year shutdown, CERN physicists have been running their collider at nearly twice the energy with which they discovered the Higgs, firing twin beams of protons with 6.5 trillion electron volts of energy at each other in search of new particles to help point them to deeper laws.
  • The most intriguing result so far, reported on Tuesday, is an excess of pairs of gamma rays corresponding to an energy of about 750 billion electron volts. The gamma rays, the physicists said, could be produced by the radioactive decay of a new particle, in this case perhaps a cousin of the Higgs boson, which itself was first noticed because it decayed into an abundance of gamma rays.
  • Or it could be a more massive particle that has decayed in steps down to a pair of photons. Nobody knows. No model predicted this, which is how some scientists like it.
  • “We are barely coming to terms with the power and the glory” of the CERN collider’s ability to operate at 13 trillion electron volts, Dr. Spiropulu said in a text message. “We are now entering the era of taking a shot in the dark!”
Emily Freilich

Higgs Boson Gets Nobel Prize, But Physicists Still Don't Know What It's Telling Them - ... - 2 views

  • This morning, two physicists who 50 years ago theorized the existence of this particle, which is responsible for conferring mass to all other known particles in the universe, got the Nobel, the highest prize in science.
  • left physicists without a clear roadmap of where to go next
  • No one is sure which of these models, if any, will eventually describe reality
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  • Some of them look at the data and say that we need to throw out speculative ideas such as supersymmetry and the multiverse, models that look elegant mathematically but are unprovable from an experimental perspective. Others look at the exact same data and come to the opposite conclusion.
  • we’ve entered a very deep crisis.
  • hough happy to know the Higgs was there, many scientists had hoped it would turn out to be strange, to defy their predictions in some way and give a hint as to which models beyond the Standard Model were correct.
  • One possibility has been brought up that even physicists don’t like to think about. Maybe the universe is even stranger than they think. Like, so strange that even post-Standard Model models can’t account for it. Some physicists are starting to question whether or not our universe is natural.
  • The multiverse idea has two strikes against it, though. First, physicists would refer to it as an unnatural explanation because it simply happened by chance. And second, no real evidence for it exists and we have no experiment that could currently test for it.
  • physicists are still in the dark. We can see vague outlines ahead of us but no one knows what form they will take when we reach them.
dpittenger

Departing Leader of CERN Ponders Uncertainties That Lie Ahead - 0 views

  • Dr. Heuer, born in Bad Boll in southern Germany in 1948, has spent his career in the trenches of particle physics, in which scientists emulate 3-year-olds by smashing bits of matter together to see what comes out.
  • He had an opportunity to put that philosophy to the test early in his term at CERN, when physicists reported in a seminar there that they had measured subatomic particles known as neutrinos streaming from Geneva to their detector in Italy faster than the speed of light, contrary to the laws of physics then known.
  • The neutrino controversy helped set a sort of dubious stage for the main event in particle physics so far this century: the Higgs boson.
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  • The Higgs boson completed the Standard Model, a suite of equations that agrees with all the experiments that have been done on earth. But that model is not the end of physics. It does not explain dark matter or dark energy, the two major constituents of the cosmos, for example, or why the universe is made of matter instead of antimatter.
  • For decades, theorists have flirted with a concept called supersymmetry that would address some of these issues and produce a bounty of new particles for CERN’s collider.
sandrine_h

What's the point of theoretical physics? - 1 views

  • Discoveries such as gravitational waves and the Higgs boson can inspire wonder at the complex beauty of the universe no matter how little you really understand them.
  • But some people will always question why they should care about scientific advances that have no apparent impact on their daily life
  • Yet the reality is that purely theoretical studies in physics can sometimes lead to amazing changes in our society. In fact, several key pillars on which our modern society rests, from satellite communication to computers, were made possible by investigations that had no obvious application at the time.
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  • Around 100 years ago, quantum mechanics was a purely theoretical topic, only developed to understand certain properties of atoms
  • But today, quantum mechanics is the basis of our use of all semiconductors in computers and mobile phones
  • Despite these direct and indirect benefits, most theoretical physicists have a very different motive for their work. They simply want to improve humanity’s understanding of the universe. While this might not immediately impact everyone’s lives, I believe it is just as important a reason for pursuing fundamental research
  • It somehow seems that every new level of understanding we achieve comes in tandem with new, more fundamental questions. It is never enough to know what we now know. We always want to continue looking behind newly arising curtains. In that respect, I consider fundamental physics a basic part of human culture.
Javier E

The Dangers of Pseudoscience - NYTimes.com - 0 views

  • the “demarcation problem,” the issue of what separates good science from bad science and pseudoscience (and everything in between). The problem is relevant for at least three reasons.
  • The first is philosophical: Demarcation is crucial to our pursuit of knowledge; its issues go to the core of debates on epistemology and of the nature of truth and discovery.
  • The second reason is civic: our society spends billions of tax dollars on scientific research, so it is important that we also have a good grasp of what constitutes money well spent in this regard.
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  • Third, as an ethical matter, pseudoscience is not — contrary to popular belief — merely a harmless pastime of the gullible; it often threatens people’s welfare,
  • It is precisely in the area of medical treatments that the science-pseudoscience divide is most critical, and where the role of philosophers in clarifying things may be most relevant.
  • some traditional Chinese remedies (like drinking fresh turtle blood to alleviate cold symptoms) may in fact work
  • There is no question that some folk remedies do work. The active ingredient of aspirin, for example, is derived from willow bark, which had been known to have beneficial effects since the time of Hippocrates. There is also no mystery about how this happens: people have more or less randomly tried solutions to their health problems for millennia, sometimes stumbling upon something useful
  • What makes the use of aspirin “scientific,” however, is that we have validated its effectiveness through properly controlled trials, isolated the active ingredient, and understood the biochemical pathways through which it has its effects
  • In terms of empirical results, there are strong indications that acupuncture is effective for reducing chronic pain and nausea, but sham therapy, where needles are applied at random places, or are not even pierced through the skin, turn out to be equally effective (see for instance this recent study on the effect of acupuncture on post-chemotherapy chronic fatigue), thus seriously undermining talk of meridians and Qi lines
  • Asma at one point compares the current inaccessibility of Qi energy to the previous (until this year) inaccessibility of the famous Higgs boson,
  • But the analogy does not hold. The existence of the Higgs had been predicted on the basis of a very successful physical theory known as the Standard Model. This theory is not only exceedingly mathematically sophisticated, but it has been verified experimentally over and over again. The notion of Qi, again, is not really a theory in any meaningful sense of the word. It is just an evocative word to label a mysterious force
  • Philosophers of science have long recognized that there is nothing wrong with positing unobservable entities per se, it’s a question of what work such entities actually do within a given theoretical-empirical framework. Qi and meridians don’t seem to do any, and that doesn’t seem to bother supporters and practitioners of Chinese medicine. But it ought to.
  • what’s the harm in believing in Qi and related notions, if in fact the proposed remedies seem to help?
  • we can incorporate whatever serendipitous discoveries from folk medicine into modern scientific practice, as in the case of the willow bark turned aspirin. In this sense, there is no such thing as “alternative” medicine, there’s only stuff that works and stuff that doesn’t.
  • Second, if we are positing Qi and similar concepts, we are attempting to provide explanations for why some things work and others don’t. If these explanations are wrong, or unfounded as in the case of vacuous concepts like Qi, then we ought to correct or abandon them.
  • pseudo-medical treatments often do not work, or are even positively harmful. If you take folk herbal “remedies,” for instance, while your body is fighting a serious infection, you may suffer severe, even fatal, consequences.
  • Indulging in a bit of pseudoscience in some instances may be relatively innocuous, but the problem is that doing so lowers your defenses against more dangerous delusions that are based on similar confusions and fallacies. For instance, you may expose yourself and your loved ones to harm because your pseudoscientific proclivities lead you to accept notions that have been scientifically disproved, like the increasingly (and worryingly) popular idea that vaccines cause autism.
  • Philosophers nowadays recognize that there is no sharp line dividing sense from nonsense, and moreover that doctrines starting out in one camp may over time evolve into the other. For example, alchemy was a (somewhat) legitimate science in the times of Newton and Boyle, but it is now firmly pseudoscientific (movements in the opposite direction, from full-blown pseudoscience to genuine science, are notably rare).
  • The verdict by philosopher Larry Laudan, echoed by Asma, that the demarcation problem is dead and buried, is not shared by most contemporary philosophers who have studied the subject.
  • the criterion of falsifiability, for example, is still a useful benchmark for distinguishing science and pseudoscience, as a first approximation. Asma’s own counterexample inadvertently shows this: the “cleverness” of astrologers in cherry-picking what counts as a confirmation of their theory, is hardly a problem for the criterion of falsifiability, but rather a nice illustration of Popper’s basic insight: the bad habit of creative fudging and finagling with empirical data ultimately makes a theory impervious to refutation. And all pseudoscientists do it, from parapsychologists to creationists and 9/11 Truthers.
  • The borderlines between genuine science and pseudoscience may be fuzzy, but this should be even more of a call for careful distinctions, based on systematic facts and sound reasoning. To try a modicum of turtle blood here and a little aspirin there is not the hallmark of wisdom and even-mindedness. It is a dangerous gateway to superstition and irrationality.
anonymous

Faith in science and religion: Truth, authority, and the orderliness of nature. - 0 views

  • A common tactic of those who claim that science and religion are compatible is to argue that science, like religion, rests on faith: faith in the accuracy of what we observe, in the laws of nature, or in the value of reason
  • Such statements imply that science and religion are not that different because both seek the truth and use faith to find it
  • science is often described as a kind of religion.
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  • Indeed, there is no evidence beyond revelation, authority, and scripture to support the religious claims above, and most of the world’s believers would reject at least one of them
  • faith involves pretending to know things you don’t
  • faith doesn’t mean “belief without good evidence,” but “confidence derived from scientific tests and repeated, documented experience.”
  • You have faith (i.e., confidence) that the sun will rise tomorrow because it always has, and there’s no evidence that the Earth has stopped rotating or the sun has burnt out.
  • We know no more now about the divine than we did 1,000 years ago.
  • The conflation of faith as “unevidenced belief” with faith as “justified confidence” is simply a word trick used to buttress religion.
  • The constant scrutiny of our peers ensures that science is largely self-correcting, so that we really can approach the truth about our universe
  • There is strong evidence for the Higgs boson, whose existence was confirmed last year by two independent teams using a giant accelerator and rigorous statistical analysis. But there isn’t, and never will be, any evidence for that sea of milk.
  • Two objects of scientific faith are said to be physical laws and reason. Doing science, it is said, requires unevidenced faith in the “orderliness of nature” and an “unexplained set of physical laws,” as well as in the value of reason in determining truth. Both claims are wrong.
  • The orderliness of nature—the set of so-called natural laws—is not an assumption but an observation
  • We take nature as we find it, and sometimes it behaves predictably.
  • Reason—the habit of being critical, logical, and of learning from experience—is not an a priori assumption but a tool that’s been shown to work
  • Finally, isn’t science at least based on the faith that it’s good to know the truth? Hardly.
  • So the next time you hear someone described as a “person of faith,” remember that although it’s meant as praise, it’s really an insult.
Ellie McGinnis

The Dangers of Pseudoscience - NYTimes.com - 0 views

  • “demarcation problem,” the issue of what separates good science from bad science and pseudoscience
  • Demarcation is crucial to our pursuit of knowledge; its issues go to the core of debates on epistemology and of the nature of truth and discovery
  • our society spends billions of tax dollars on scientific research, so it is important that we also have a good grasp of what constitutes money well spent in this regard
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  • pseudoscience is not — contrary to popular belief — merely a harmless pastime of the gullible; it often threatens people’s welfare, sometimes fatally so
  • in the area of medical treatments that the science-pseudoscience divide is most critical, and where the role of philosophers in clarifying things may be most relevant
  • What makes the use of aspirin “scientific,” however, is that we have validated its effectiveness through properly controlled trials, isolated the active ingredient, and understood the biochemical pathways through which it has its effects
  • inaccessibility of the famous Higgs boson, a sub-atomic particle postulated by physicists to play a crucial role in literally holding the universe together (it provides mass to all other particles)
  • Philosophers of science have long recognized that there is nothing wrong with positing unobservable entities per se, it’s a question of what work such entities actually do within a given theoretical-empirical framework.
  • we are attempting to provide explanations for why some things work and others don’t. If these explanations are wrong, or unfounded as in the case of vacuous concepts like Qi, then we ought to correct or abandon them.
  • no sharp line dividing sense from nonsense, and moreover that doctrines starting out in one camp may over time evolve into the other.
  • Popper’s basic insight: the bad habit of creative fudging and finagling with empirical data ultimately makes a theory impervious to refutation. And all pseudoscientists do it, from parapsychologists to creationists and 9/11 Truthers.
  • The open-ended nature of science means that there is nothing sacrosanct in either its results or its methods.
  • The borderlines between genuine science and pseudoscience may be fuzzy, but this should be even more of a call for careful distinctions, based on systematic facts and sound reasoning
qkirkpatrick

Research funding: Is size really the most important thing? | Science | The Guardian - 0 views

  • Though investment had declined under the previous government, all the major parties said some warm words on the topic. Going beyond that vague-but-positive consensus would have required pinning politicians down to specific pledges
  • There are also important discussions to be had about how funding is managed and distributed, and how such decisions are made. In arguments about levels of funding, expect most researchers to agree that more is better – no surprise there, and the quality of the arguments deserves scrutiny.
  • Those hoardings are coming down now, which makes the whole thing seem more approachable - as does the fact that a couple of physicists from my department have won access to the labs there. It will be a huge concentration of resource - intellectual and financial
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  • The hope is that the facilities, and perhaps more importantly the close interconnections between outstanding scientists in different fields, that it provides, will lead to it being more than the sum of its parts.
  • Some science directly addresses so-called “big questions”. How did life begin? What is everything made of? How did the universe begin? Often these big questions are posed within a specific theoretical framework; the Higgs boson is an example of how a good theory can condense a set of very big questions - essentially “What is mass?”
  • big projects are inevitably political to some extent, if only because of the fondness leaders have for making grand (or “grandiose”, as Amos would have it) announcements. Many big projects are international, which can bring in other elements, and requires decision-making frameworks that, while imperfect, do exist even if not all scientists are fully aware of them.
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    Can politics affect science and what information is released and not released?
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