Items tagged with: physics

Particle Accelerators That Fit on a Chip

#science #chip #particleaccelerator #physics #hackaday
posted by pod_feeder_v2
Particle Accelerators That Fit on a Chip
Physicists prove that 2-D and 3-D liquids are fundamentally different

In ordinary three-dimensional liquids, such particles execute a type of random motion known as Brownian motion.

But in two-dimensional liquids, the team was able to demonstrate that the Brownian motion is overlaid on large-scale collective motions. (.... atoms in 2-D liquids can travel for long distances before effectively 'forgetting' their initial positions. ) This collective motion was previously believed to only occur in 2-D solids.

Galileo had it coming

The Renaissance Mathematicus considers the importance that #Galileo's famously controversial work, Dialogo sopra i due massimi sistemi del mondo, actually played in the development of modern #astronomy:
What role did the #Dialogo actually play in the ongoing cosmological/astronomical debate in the seventeenth century? The real answer is, given its reputation, surprisingly little. In reality Galileo was totally out of step with the actual debate that was taking place around 1630. Driven by…

#history #science #physics #renaissance #modernity #tycho #kepler #heliocentricity #geocentricity #ptolemy #copernicus
Wave physics as an analog recurrent neural network


I could watch this all day...more fascinated by the red clustering than the green (around libration point). Although the size of the stable area of the liberation point regions is interesting too. #space #physics #science

"Are we part of a dying reality or a blip in eternity? The value of the Hubble Constant could tell us which terror awaits"

Fate of the Universe

#Physics #Space #Astronomy #Cosmology
anyone else like how the #hindu #pantheon is kinda like another set of #stringtheory / #cosmology / #metaphysics / #physics ? :D
Researchers crack Newton's elusive three-body problem

...in reality, three-body equations became much more difficult to solve.... if all three objects are of a comparable size and distance from the center point, a power struggle develops and the whole system is thrown into chaos. When chaos happens, it becomes impossible to track the bodies' movements using regular math.

Stone and Professor Nathan Leigh at Chile's La Universidad de Concepción relied on discoveries from the past two centuries, namely that unstable three-body systems will eventually expel one of the trio, and form a stable binary relationship between the two remaining bodies. This relationship was the focus of their study.

"When we compared our predictions to computer-generated models of their actual movements, we found a high degree of accuracy,"

While the researchers stress that their findings d
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How does our Milky Way galaxy get its spiral form?
According to research from the Stratospheric Observatory for Infrared Astronomy (SOFIA), magnetic fields play a strong role in shaping these galaxies.
Physicist proposes a new approach in modeling the evolution of the universe


● NEWS ● #wired #Science ☞ A Kung Fu Master’s Leap Breaks the Internet—but Not #Physics
Emmy Noether discovered that every symmetry corresponds to a conservation law. Now physicists are using that to bootstrap the laws of physics from first principles, and it turns out that the four known forces are inevitable emergent behaviors. #physics

Building Your Own Tensegrity Structure

#3dprinterhacks #mischacks #geometry #physics #tensegrity #hackaday
posted by pod_feeder_v2
Building Your Own Tensegrity Structure

A Single-Digit-Micrometer Thickness Wood Speaker

#chemistryhacks #materialsscience #physics #research #wood #hackaday
posted by pod_feeder_v2
A Single-Digit-Micrometer Thickness Wood Speaker
Theorem explains why quantities such as heat and power can fluctuate in microscopic system

However, this intuitive nature of entropy does not necessarily apply to the microscopic world. Physicists have therefore reinterpreted the second law by giving it a statistical twist: Entropy indeed increases, but there is a non-null probability that it may sometimes decrease.

Fluctuation theorems (FTs) quantified this probability with precision, and the issue has practical interest in regard to the operation of nanoscale machines. FTs were proposed for the first time in an article published in 1993.

An article published recently in the same journal shows that one consequence of FTs is thermodynamic uncertainty relations, which involve fluctuations in the values of thermodynamic quantities such as heat, work and power.

"The physical origins of thermodynamic unce
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MOOSE: A platform to create complex multiphysics simulations

MOOSE is a high-level pluggable architecture that allows engineers and scientists to leverage the power of large supercomputers when trying to solve complex real-world problems, even if they have little or no knowledge of parallel programming techniques. Since its release in 2014, it has consistently grown in popularity, and it is now used by several research teams worldwide.

Planets around a black hole? Calculations show possibility of bizarre worlds

"With the right conditions, planets could be formed even in harsh environments, such as around a black hole,"

"Our calculations show that tens of thousands of planets with 10 times the mass of the Earth could be formed around 10 light-years from a black hole,"
Researchers reach milestone in #quantum standardization

Researchers at the University of Waterloo have developed a method that could pave the way to establishing universal standards for measuring the performance of quantum computers.

The new method, called cycle benchmarking, allows researchers to assess the potential of scalability and to compare one quantum platform against another.

"Cycle benchmarking is the first method for reliably checking if you are on the right track for scaling up the overall design of your quantum computer," said Wallman. "These results are significant because they provide a comprehensive way of characterizing errors across all quantum computing platforms."
A technique to measure mechanical motion beyond the quantum limit

Researchers ...have recently developed a new technique to measure mechanical motion using simultaneous electromechanical amplification and cooling processes.

“we are using these mechanical systems to efficiently convert signals between the microwave domain and the optical domain. The conversion of signals between these two disparate frequency bands"

"Our research came about for two reasons,... First...enabling the conversion of signals between microwave and optical domains, (which is important for networking future quantum computers, or to build the equivalent of the quantum internet). ... (Second, they) wanted to figure out a way to measure this motion beyond the quantum limit (which is difficult to achieve by using back-action evading measurement)”

Mechanical oscillators are used in
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ovalb - 2019-11-15 16:26:59 GMT
#introduction #russia
Hello. I like #physics, #astronomy and #philosophy.
I think that everybody can joke about everything.
Also I like watching #anime and reading #books. I love #imageboards.
And I am looking for a pen pal. I mean, to chat using real letters. ✉️
ШУЕ ППШ Image/photo
Quantum physics: Our study suggests objective reality doesn't exist

In 1961, physicist Eugene Wigner proposed a provocative thought experiment....

The scenario has long remained an interesting thought experiment. But does it reflect reality? Scientifically, there has been little progress on this until very recently, when Časlav Brukner ... showed that, under certain assumptions, Wigner's idea can be used to formally prove that measurements in quantum mechanics are subjective to observers.

We have now for the first time performed this test experimentally...

The theory, however, is based on a few assumptions. These include that the measurement outcomes are not influenced by signals travelling above light speed and that observers are free to choose what measurements to make. That may or may not be the case.

Another important question is whether single photons can be conside
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Shape of the universe: study could force us to rethink everything we know about the cosmos

Now our new paper,...has come to a conclusion that may unleash a crisis in #cosmology—if confirmed. We show that the shape of the universe may actually be curved rather than flat, as previously thought—with a probability larger than 99%. In a curved universe, no matter which direction you travel in, you will end up at the starting point—just like on a sphere. Though the universe has four dimensions, including time.

The result was based on recent measurements of the Cosmic Microwave Background, the light left over from the Big Bang, collected by the Planck Satellite.

Once we assume that the universe is curved, the Planck data is essentially in disagreement with all other datasets. This all boil
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#Physics #Biology | A natural biomolecule has been measured acting like a #quantum wave for the first time http://bit.ly/32I850P

Incredible 4D Microscope Images Make Molecular Structures Look Like Psychedelic Art. #physics #atoms

Source: sciencealert.com/powerful-4d-mi…

Spiders and ants inspire metal that won't sink
Galactic fountains and carousels: order emerging from chaos



Scientists further refine how quickly the #universe is expanding

"Our understanding of these fundamental constants has defined the universe as we now know it. When our understanding of laws becomes more precise, our definition of the universe also becomes more precise, which leads to new insights and discoveries."

"The large majority of the universe is made up of dark energy and dark matter. And we believe it is dark energy that is 'blowing up the balloon.' Dark energy is pushing things away from each other. Gravity, which attracts objects toward each other, is the stronger force at the local level, which is why some galaxies continue to collide. But at cosmic distances, dark energy is the dominant force."

"Our results show the maturity reached in the last decade by the relatively recent field of hig
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A new #quantum data classification protocol brings us nearer to a future 'quantum internet'

With the design of these quantum information networks come new theoretical challenges, given that it is necessary to establish optimised automated information treatment protocols to work with quantum data, in the same way as current communication networks automatically manage information.

UAB researchers have had to deal with one of these challenges for the first time: the problem with sorting data from a quantum systems network according to the state in which they were prepared. The researchers have devised an optimal procedure that can identify clusters of identically prepared quantum systems.
The protocol developed by researchers at the UAB shows a natural connection to an archetypical use
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New research synthesizes different aspects of #causality in quantum field theory

In current quantum field theory, causality is typically defined by the vanishing of field commutators for spacelike separations. Two researchers at the University of Massachusetts and Universidade Federal Rural in Rio de Janeiro have recently carried out a study discussing and synthesizing some of the key aspects of causality in quantum field theory. Their paper, published in Physical Review Letters, is the result of their investigation of a theory of quantum gravity commonly referred to as "quadratic gravity."

"Like the ingredients of the standard model, quadratic gravity is a renormalizable quantum field theory, but it has some peculiar properties," John Donoghue, one of the researchers who carried out the study, to
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Mathematics at the speed of light

...researchers ...have created a nanostructured surface capable of performing on-the-fly mathematical operations on an input image. This discovery could boost the speed of existing imaging processing techniques and lower energy usage. The work enables ultrafast object detection and augmented reality applications
Simulations show how massive black holes could be formed by mergers

Prior research has shown that it is likely that black holes that form due to the death of a star cannot exceed 40 solar masses—more massive stars would have more nuclei which suggests they would wind up as pairs of unstable supernovae. But researchers working at the #LIGO and #VIRGO projects have found evidence of black holes that are bigger than the 40 solar mass threshold. Some in the field have proposed that such black holes could come about due to random collisions and mergers with other black holes—but the idea has not been fully developed until now
Exactly one hundred years ago, a revolution in science was announced in the New York Times. Further quotes from the book "Scientific Activity and Life of Albert Einstein" by Abraham Pais.

Ровно сто лет назад было объявлено о революции в науке в газете New York Times. Далее цитаты из книги "Научная деяте... Show more...
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