Archive for the ‘physics’ category: Page 244
Apr 3, 2019
What Existed Before The Big Bang? Astronomers Have Found a Test to Narrow It Down
Posted by Quinn Sena in categories: cosmology, evolution, physics
Today our middle-aged Universe looks eerily smooth. Too smooth, in fact.
While a rapid growth spurt in space-time would explain what we see, science needs more than nice ideas. It needs evidence that whittles away contending arguments. We might finally know where to look for some.
A team of physicists from the Centre for Astrophysics | Harvard & Smithsonian (CfA) and Harvard University went back to the drawing board on the early Universe’s evolution to give us a way to help those inflation models stand out from the crowd.
Apr 2, 2019
Which of the 5 Senses Is Best? Scientists Finally Settle a Heated Debate
Posted by Genevieve Klien in categories: education, physics
If there is one thing Twitter has taught us, it’s that the world loves a question that sounds stupid but actually has a profound and interesting answer. For instance, what would happen if the world suddenly turned into blueberries, as answered by physics recently. Or what color is that dress?
In a similar way, perception scientists have recently been fighting it out on Twitter to answer the seemingly trivial question of: “Which is the best sense and why?” The debate has opened up some surprisingly deep questions — like what actually makes a sense more or less valuable? And, are some senses fundamentally more important in making us human?
The question was also put to a poll. While most people would probably assume the obvious winner is vision, “somatosensation” — which we normally refer to as touch but technically incorporates all sensations from our body — took the day. But does this vote hold up when you take a closer look at the scientific evidence?
Continue reading “Which of the 5 Senses Is Best? Scientists Finally Settle a Heated Debate” »
Apr 2, 2019
Information theory: explaining life with physics
Posted by Genevieve Klien in categories: biological, physics
Mar 30, 2019
LIGO to Resume Its Nobel-winning Hunt for Gravitational Waves
Posted by Genevieve Klien in categories: cosmology, physics
The hunt for gravitational waves is back on. After a series of upgrades, the National Science Foundation’s Laser Interferometer Gravitational-Wave Observatory (LIGO) will resume its search for ripples in space and time on Monday, April 1.
LIGO is famous for making the first direct detection of gravitational waves in 2015, for which the observatory’s founders were awarded the Nobel Prize. The observatory was able to detect gravity waves generated by two colliding black holes which were located 1.3 billion light-years away from Earth, and since then has observed nine more black hole mergers and one collision of two neutron stars.
Gravitational waves are ripples in the fabric of spacetime, caused by massive bodies which bend it like a bowling ball placed on a rubber sheet. They were predicted by Einstein as part of his general theory of relativity in 1916, but it took nearly a century for physicists to observe them because the effects are so small. Since these waves have been detected, they can be used to investigate cosmic objects as an alternative to light-based telescopes.
Continue reading “LIGO to Resume Its Nobel-winning Hunt for Gravitational Waves” »
Mar 28, 2019
An experiment that solved a 100-year-old mystery posed by Einstein is about to turn back on — and it’s more powerful than ever
Posted by Genevieve Klien in categories: cosmology, physics
- Colliding black holes and neutron stars create ripples in spacetime, called gravitational waves. These were “heard” for the first time in September 2015.
- On Monday, a pair of gravitational-wave detectors called LIGO will turn back on after 6 months of downtime and upgrades.
- To boost its power, the experiment will now work with a sister machine in Italy called Virgo.
- Physicists expect the next period of searching for colliding black holes to last a year and be 40% more sensitive than before.
One of the most remarkable experiments in history — a pair of giant machines that listen for ripples in spacetime called gravitational waves — will wake up from a half-year nap on Monday. And it will be about 40% stronger than before.
That experiment is called the Laser Interferometer Gravitational-Wave Observatory (LIGO); it consists of two giant, L-shaped detectors that together solved a 100-year-old mystery posed by Albert Einstein.
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Mar 27, 2019
Physicists Create Stable ‘Supercrystals’
Posted by Quinn Sena in categories: materials, physics
Stimulation with ultrafast light pulses can realize and manipulate states of matter with emergent structural, electronic and magnetic phenomena. According to a new study, published in the journal Nature Materials, an ultrafast laser pulse plus ‘frustration’ resulted in a new state of matter — a ‘supercrystal.’
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Mar 27, 2019
This Superfluid Is Alive, And It Could Power Machines of the Future
Posted by Quinn Sena in categories: physics, solar power, sustainability
Fluids with zero viscosity seemingly defy the laws of physics and they have endless applications. But they’ve been hard to make, until now. The secret? Bacteria!
Scientists’ Crazy Plan to Power Solar Panels With E. Coli — https://youtu.be/_XZGrZ3DeLg
Continue reading “This Superfluid Is Alive, And It Could Power Machines of the Future” »
Mar 21, 2019
Why an Incredible New CERN Observation Has Physicists Popping Champagne
Posted by Genevieve Klien in categories: physics, space
Scientists have announced the observation of “CP violation in a D meson” at CERN, a discovery that will appear in physics textbooks for years to come. You’re probably wondering what exactly it means.
The Universe is full of regular matter. There’s also antimatter, which exists even here on Earth, but there’s much less of it. This new observation is important on its own, but it also takes physicists another step closer to explaining where all the antimatter has disappeared to.
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Mar 20, 2019
One transistor for all purposes
Posted by Quinn Sena in categories: computing, economics, nanotechnology, physics
In mobiles, fridges, planes – transistors are everywhere. But they often operate only within a restricted current range. LMU physicists have now developed an organic transistor that functions perfectly under both low and high currents.
Transistors are semiconductor devices that control voltage and currents in electrical circuits. To reduce economic and environmental costs, electronic devices must become smaller and more effective. This applies above all to transistors. In the field of inorganic semiconductors, dimensions below 100 nanometers are already standard. In this respect, organic semiconductors have not been able to keep up. In addition, their performance with regard to charge-carrier transport is considerably worse. But organic structures offer other advantages. They can easily be printed on an industrial scale, the material costs are lower, and they can be transparently applied to flexible surfaces.
Thomas Weitz, a professor in LMU’s Faculty of Physics and a member of the Nanosystems Initiative Munich, and his team are working intensively on the optimization of organic transistors. In their latest publication in Nature Nanotechnology, they describe the fabrication of transistors with an unusual structure, which are tiny, powerful and above all versatile. By carefully tailoring a small set of parameters during the production process, they have been able to design nanoscale devices for high or low current densities. The primary innovation lies in the use of an atypical geometry, which also facilitates assembly of the nanoscopic transistors.
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