background preloader

Physics

Facebook Twitter

For the First Time, Physicists Have Measured the "Strong Force" of Antimatter. Yep, the Force of Gravity is the Same Throughout the Universe. Surfing a wake of light | Harvard John A. Paulson School of Engineering and Applied Sciences. When a duck paddles across a pond or a supersonic plane flies through the sky, it leaves a wake in its path. Wakes occur whenever something is traveling through a medium faster than the waves it creates — in the duck’s case water waves, in the plane’s case shock waves, otherwise known as sonic booms. Wakes can exist wherever there are waves, even if those waves are light. While nothing travels faster than the speed of light in a vacuum, light isn’t always in a vacuum. It is possible for something to move faster than the phase velocity of light in a medium or material and generate a wake. The most famous example of this is Cherenkov radiation, wakes produced as electrical charges travel through liquids faster than the phase velocity of light, emitting a glowing blue wake.

For the first time, Harvard researchers have created similar wakes of light-like waves moving on a metallic surface, called surface plasmons, and demonstrated that they can be controlled and steered. This Experiment Will Make You Believe in Spontaneous Generation of Life. Rogue antimatter found in thunderclouds. Eric Meola/Corbis Lightning is only the most visible product of clouds’ intense electric fields. When Joseph Dwyer’s aeroplane took a wrong turn into a thundercloud, the mistake paid off: the atmospheric physicist flew not only through a frightening storm but also into an unexpected — and mysterious — haze of antimatter.

Although powerful storms have been known to produce positrons — the antimatter versions of electrons — the antimatter observed by Dwyer and his team cannot be explained by any known processes, they say. “This was so strange that we sat on this observation for several years,” says Dwyer, who is at the University of New Hampshire in Durham. The flight took place six years ago, but the team is only now reporting the result (J. A key feature of antimatter is that when a particle of it makes contact with its ordinary-matter counterpart, both are instantly transformed into other particles in a process known as annihilation. The Large Hadron Collider Is Back, Baby. No Big Bang? Quantum equation predicts universe has no beginning. (Phys.org) —The universe may have existed forever, according to a new model that applies quantum correction terms to complement Einstein's theory of general relativity.

The model may also account for dark matter and dark energy, resolving multiple problems at once. The widely accepted age of the universe, as estimated by general relativity, is 13.8 billion years. In the beginning, everything in existence is thought to have occupied a single infinitely dense point, or singularity. Only after this point began to expand in a "Big Bang" did the universe officially begin. Although the Big Bang singularity arises directly and unavoidably from the mathematics of general relativity, some scientists see it as problematic because the math can explain only what happened immediately after—not at or before—the singularity. Old ideas revisited The physicists emphasize that their quantum correction terms are not applied ad hoc in an attempt to specifically eliminate the Big Bang singularity. Kandiru comments on Chemists Confirm the Existence of New Type of Bond.

Superconductivity without cooling : science. A few days ago, CERN launched an Open Data Portal to publicly share data from the Large Hadron Collider. We are some of the scientists behind this project, working to make science more open globally. Ask Us (Almost) Anything about open data, open access, Freakishly Compact Particle Accelerators Could Revolutionize Physics. Computer Simulation Confirms the Possibility of Time Travel. Using photons, Australian scientists managed to create a model in which quantum particles can move back in time. As it turned out, the laws of standard quantum mechanics may be violated at the same time. Physicists from the University of Queensland in Australia set out to simulate a computer experiment, which could prove the possibility of time travel at the quantum level, predicted in 1991. They managed to simulate the behavior of a single photon passing through a wormhole in space-time in the past and engaging with itself.

Such a trajectory of a particle is called a closed timelike curve, i.e. a photon returns to the original space-time point and its worldline closes. The researchers studied two scenarios. According to the scientists, their work will make an important contribution to the unification of the two great theories in physics, which till this moment had little in common: the Einstein’s general theory of relativity and quantum mechanics. Are High Energy Neutrinos from Outer Space Really a Big Deal? Hooray! Goldberg is back! Awesome! "The energy range for these neutrinos was approximately 1 Petaelectronvolt, which to put things in perspective, is roughly 140 times the peak energy of particles in the Large Hadron Collider. It's thousands of times more energy than found in the mass of any particle we've ever yet discovered, which raises the obvious question: where the hell did these things come from?

" Yes, in all seriousness, this is a profound mystery. I agree. Although I wouldn't be surprised if some io9 wag would cite images of Event Horizon on the literal assumption that these things are being hatched by Satan. Anyway, Dave, I have a request: Please, please, please! Ever since that article on NASA research into FTL drives, we got people around here dusting off their old Trek cosplay and humming Alexander Courage. Yes, I recall that article and thanks for it! Just so I can cite that whenever someone around here starts frothing. I'll e-mail you. Scientists Work Out How To Make Matter From Light. Theoretical physicists have proposed a way they think will allow us to create matter from light. The experiment has yet to be done, but has passed peer review as practical and the inventors are in discussions with experimentalists with the equipment to carry it out. The proposal has created excitement because, while it has been accepted for 80 years that two photons of light could theoretically create matter, for that time the demonstrational proof was regarded as beyond the reach of lab equipment.

As Einstein's much quoted, but seldom understood, equation e=mc2 tells us, matter and energy are connected. One can turn into another. Light is one of the forms of energy produced from matter in atomic bombs. In 1934 Gregory Breit and John Wheeler proposed that, under the right circumstances, two photons of light would convert into an electron and its antimatter equivalent the positron. Now Rose and his Phd student Oliver Pike have come up with a way to put this sort of modeling to the test.

Scientists Detect A Particle That Could Be A New Form Of Matter. Fascinating. Although, I have to wonder what the straight forward real world application to this would be? I understand very basically what is being said, but I don't know if this has any theoretical technological benefits? Or is this more of a cataloguing issue? Everything that comes out of CERN is science for its own sake. That doesn't mean that their won't be applications. When you are old and grey, you can tell your grand kids, as new-tetra quark technology is coming on-line, about how gobsmacked you were on the day the tetraquark was discovered.

It's basic science. (Science journalism in the bad old days used to make a point of ALWAYS including a possible application; editors believed people would dismiss science reporting unless there was a gee-whiz hook. My question was for immediate practical application that could come from this, not any-at-all-generally. So you could have just said, "I dunno. New State of Matter Discovered. There was a time when states of matter were simple: Solid, liquid, gas. Then came plasma, Bose -Einstein condensate, supercritical fluid and more. Now the list has grown by one more, with the unexpected discovery of a new state dubbed “dropletons” that bear some resemblance to liquids but occur under very different circumstances. The discovery occurred when a team at the University of Colorado Joint Institute for Lab Astrophysics were focusing laser light on gallium arsenide (GaAs) to create excitons.

Excitons are formed when a photon strikes a material, particularly a semiconductor. If an electron is knocked loose, or excited, it leaves what is termed an “electron hole” behind. If the forces of other charges nearby keep the electron close enough to the hole to feel an attraction, a bound state forms known as an exciton. “But the experiment didn’t behave at all in the way we expected,” Almand-Hunter said. The discovery has been published in Nature. A New Record for the Highest Temperature We've Ever Created: A Whopping 4 Trillion Degrees Celsius. We are in a moment of transition. Every day, we discover something new, something inspiring, something awesome... for a billion negative things in our world, there are a billion-billion positive ones, if only we take the time to understand. I want to see the sunrise on another world. I want to know what lies beyond what we know now. I want to face the future, and if it is dark - then I want to try to bring some light to it.

Only a fool would think we would encounter no difficulties, only an idiot would believe that the effort involved in understanding the universe wasn't worth the price we will eventually pay or the reward that awaits us. We will overcome the obstacles, and while I don't think that the universe will be friendly, I do believe we will find friends enough when we are ready. I guess I believe in hope. Brookhaven National Laboratory — a passion for discovery. Quantum Cloud Simulates Magnetic Monopole. Physicists have created and photographed an isolated north pole — a monopole — in a simulated magnetic field, bringing to life a thought experiment that first predicted the existence of actual magnetic monopoles more than 80 years ago. In nature, north and south magnetic poles always go hand in hand. Cutting a bar magnet in half just creates two magnets, each of which still has two poles, rather than creating separate north and south poles on each half.

Yet their electrostatic cousins, positive and negative charges, exist independently. In 1931, British physicist Paul Dirac theorized that if magnetic monopoles did exist, it would not only address this seeming imbalance, but would also explain why charge exists in discrete packages: multiples of the charge of a single electron. Researchers have in fact suggested that the Big Bang should have forged magnetic monopoles as elementary particles, but so far no one has ever detected such things or created them in the lab. Synthetic magnetic monopoles have been created in the lab. A magnet always has a north and a south pole. Even if a magnet is cut in half down to the atomic level, magnetic fields are bipolar. However, in 1931 it was theorized that there are natural monopoles which help explain some of the peculiarities of magnetism.

This has never before been tested because scientists have not been able to create monopole elementary particles in the lab that could be studied individually - until now. The research was led by David Hall of Amherst College and the results were published in Nature. Hall’s lab was able to create the monopole particles by chilling rubidium atoms to less than 100-billionths of a degree warmer than absolute zero.

This temperature drives atoms into a Bose-Einstein condensate (BEC), which is the lowest quantum state possible. This condensation causes the rubidium to act differently than they normally would, forming a cloud that acted like a wave and not a group of individual particles. Physicists say energy can be teleported 'without a limit of distance' Yes, electrons are perfectly round -- and that's a problem. There is no pink light. Accelerator on a chip: Technology could spawn new generations of smaller, less expensive devices for science, medicine.

In an advance that could dramatically shrink particle accelerators for science and medicine, researchers used a laser to accelerate electrons at a rate 10 times higher than conventional technology in a nanostructured glass chip smaller than a grain of rice. The achievement was reported today in Nature by a team including scientists from the U.S. Department of Energy's (DOE) SLAC National Accelerator Laboratory and Stanford University.

"We still have a number of challenges before this technology becomes practical for real-world use, but eventually it would substantially reduce the size and cost of future high-energy particle colliders for exploring the world of fundamental particles and forces," said Joel England, the SLAC physicist who led the experiments. "It could also help enable compact accelerators and X-ray devices for security scanning, medical therapy and imaging, and research in biology and materials science. " Today's accelerators use microwaves to boost the energy of electrons. The Very First Image of a Hydrogen Bond. If Time Were 2D… - From Quarks to Quasars. Question: There are lots of articles written about trying to imagine a 4th dimension of space, but what would it be like to live in a universe with a 2nd dimension of time?

The short answer: We simply don’t know. This question is a bit more complicated than talking about different spacial dimensions because we experience 3 dimensions of space, and so we can use what we know about life in one dimension (and how it changes when you have two dimensions) to make inferences about what 4 or more dimensions would be like. But it would be extremely difficult to imagine how things behave in 2 or 3 dimensions if we lived in a one dimensional universe (we would have nothing upon which to base our inferences).

This is exactly the problem that we have with our 1d view of time. Consequently, much of what will be discussed is HIGHLY theoretical, if not blatant guesswork. And now for the long answer: A universe with two dimensions of time would be super confusing and probably a little bit lonely. Model describes universe with no big bang, no beginning, and no end. (PhysOrg.com) -- By suggesting that mass, time, and length can be converted into one another as the universe evolves, Wun-Yi Shu has proposed a new class of cosmological models that may fit observations of the universe better than the current big bang model. What this means specifically is that the new models might explain the increasing acceleration of the universe without relying on a cosmological constant such as dark energy, as well as solve or eliminate other cosmological dilemmas such as the flatness problem and the horizon problem.

Shu, an associate professor at National Tsing Hua University in Taiwan, explains in a study posted at arXiv.org that the new models emerge from a new perspective of some of the most basic entities: time, space, mass, and length. In his proposal, time and space can be converted into one another, with a varying speed of light as the conversion factor. As Shu writes in his paper, the newly proposed models have four distinguishing features: From Quarks to Quasars. An 'alternative universe' will eventually destroy ours, says Higgs researcher. Nope. This theory is actually based on much more concrete evidence than that. It's based on very carefully measured properties of very real particles, which definitely exist. Those numbers are put into a theory which has, so far, accurately predicted not only the behavior, but the existence of every fundamental particle that we've discovered.

When the Higgs (a real, not theoretical particle) was discovered, it's carefully measured properties were also included in the calculation. Then a scenario is come up with which tells us a great deal about the universe we live in, how and why it exists and what will happen to it long after we're gone. Science works best when it sticks to observation. We know little to nothing about the universe we live in and CAN see. A safe theory to postulate, since no one can disprove it... also, it's useless information regardless. Ahhh, vanity. I'm actually excited and fascinated by the (possible and at best probable) discovery of Higgs. Facebook. Light completely stopped for a record-breaking minute - physics-math - 25 July 2013. Scientists ‘freeze’ light for an entire minute. The Search for Antimatter. Timeline Photos. Where does the Standard Model of physics come from?

Your Mass is NOT from Higgs Boson. How Special Relativity Makes Magnets Work. Quantum Levitation. The Feynman Lectures on Physics. Watch a series of seven brilliant lectures by Richard Feynman. 110, 213001 (2013): Hydrogen Atoms under Magnification: Direct Observation of the Nodal Structure of Stark States. The First Image Ever of a Hydrogen Atom's Orbital Structure. Acoustic Levitation Video Shows Liquid Droplets Floating On Sound Waves In Midair. Hunting the Higgs Now Playing: CERN live webcast. Higgs Hiccup: Contradictory Results Show Up at LHC | Wired Science. What Today's Higgs Boson Discovery Really Means. Physicists reveal compelling evidence for the "God Particle" Did they really detect the Higgs Boson? What is the Higgs boson and why does it matter? - physics-math - 13 December 2011.

Physics News, Videos, Reviews and Gossip - io9. Watch a Livestream of the Higgs Boson Announcement Tonight | Wired Science. Physicists Say They Have Found a Higgs Boson. Facebook. A Bicycle Can Be Self-Stable Without Gyroscopic or Caster Effects. [1206.6809] New Dark Matter Detectors using DNA for Nanometer Tracking. Revolutionary 'DNA Tracking Chamber' Could Detect Dark Matter  Physicists make new form of matter.

Dysprosium. Facebook. Super-Kamiokande.