Physics News and Discussions

weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Physicists discover special transverse sound wave
https://phys.org/news/2021-12-physicist ... verse.html
by City University of Hong Kong
Can you imagine sound traveling in the same way as light does? A research team at City University of Hong Kong (CityU) has discovered a new type of sound wave: The airborne sound wave vibrates transversely and carries both spin and orbital angular momentum like light does. The findings shattered scientists' previous beliefs about the sound wave, opening an avenue to the development of novel applications in acoustic communications, acoustic sensing and imaging.

The research was initiated and co-led by Dr. Shubo Wang, Assistant Professor in the Department of Physics at CityU, and conducted in collaboration with scientists from Hong Kong Baptist University (HKBU) and the Hong Kong University of Science and Technology (HKUST). It was published in Nature Communications, titled "Spin-orbit interactions of transverse sound."
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Toward achieving megatesla magnetic fields in the laboratory

by Osaka University
https://phys.org/news/2021-12-megatesla ... atory.html
Recently, a research team at Osaka University has successfully demonstrated the generation of megatesla (MT)-order magnetic fields via three-dimensional particle simulations on laser-matter interaction. The strength of MT magnetic fields is 1–10 billion times stronger than geomagnetism (0.3–0.5 G), and these fields are expected to be observed only in the close vicinity of celestial bodies such as neutron stars or black holes. This result should facilitate an ambitious experiment to achieve MT-order magnetic fields in the laboratory, which is now in progress.

Since the 19th century, scientists have strived to achieve the highest magnetic fields in the laboratory. To date, the highest magnetic field observed in the laboratory is in the kilotesla (kT)-order. In 2020, Masakatsu Murakami at Osaka University proposed a novel scheme called microtube implosions (MTI) to generate ultrahigh magnetic fields on the MT-order. Irradiating a micron-sized hollow cylinder with ultraintense and ultrashort laser pulses generates hot electrons with velocities close to the speed of light. Those hot electrons launch a cylindrically symmetric implosion of the inner wall ions towards the central axis. An applied pre-seeded magnetic field of the kilotesla-order, parallel to the central axis, bends the trajectories of ions and electrons in opposite directions because of the Lorentz force. Near the target axis, those bent trajectories of ions and electrons collectively form a strong spin current that generates MT-order magnetic fields.
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Towards quantum states of sound
https://phys.org/news/2021-12-quantum-states.html
by Hayley Dunning, Imperial College London
Researchers make key steps towards generating quantum states of sound inside a microscopic device using laser light and single-photon measurements.

Across the globe, researchers can now generate and control quantum states in a wide variety of different physical systems spanning individual particles of light to complex molecules comprising thousands of atoms. This control is enabling powerful new quantum technologies to be developed, such as quantum computing and quantum communications, and also offers exciting paths to test the foundations of quantum physics. In particular, a key current challenge is how to create quantum states on a larger scale, which will enable the technological potential of quantum physics to be established and the boundary of quantum physics to be explored.

A team of researchers at Imperial College London, together with the University of Oxford, the Niels Bohr Institute, the Max Planck Institute for the Science of Light, and Australian National University have generated and observed non-Gaussian states of high-frequency sound waves comprising more than a trillion atoms. More specifically, the team transform a randomly fluctuating sound field in thermal equilibrium to a pattern thrumming with a more specific magnitude.
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Exotic six-quark particle predicted by supercomputers
https://phys.org/news/2021-12-exotic-si ... uters.html
by RIKEN
The predicted existence of an exotic particle made up of six elementary particles known as quarks by RIKEN researchers could deepen our understanding of how quarks combine to form the nuclei of atoms.

Quarks are the fundamental building blocks of matter. The nuclei of atoms consist of protons and neutrons, which are in turn made up of three quarks each. Particles consisting of three quarks are collectively known as baryons.

Scientists have long pondered the existence of systems containing two baryons, which are known as dibaryons. Only one dibaryon exists in nature—deuteron, a hydrogen nucleus made up of a proton and a neutron that are very lightly bound to each other. Glimpses of other dibaryons have been caught in nuclear-physics experiments, but they had very fleeting existences.

"Although the deuteron is the only known stable dibaryon, many more dibaryons may exist," says Takuya Sugiura of the RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program. "It's important to study which pairs of baryons form dibaryons and which do not because this provides valuable insights into how quarks form matter."
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Einstein's theory passes rigorous 16-year tests
https://phys.org/news/2021-12-einstein- ... -year.html
by CSIRO
An international team has used telescopes around the world, including CSIRO's Parkes radio telescope—Murriyang, to complete the most challenging tests yet of Einstein's general theory of relativity.

The team, led by Professor Michael Kramer from the Max-Planck-Institute for Radio Astronomy in Bonn, Germany, showed that Einstein's theory published in 1915 still holds true.

Dr. Dick Manchester, a Fellow at Australia's national science agency, CSIRO, and a member of the research team, explained how this result provides us with a more precise understanding of our Universe.
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Gravitational wave scientists set their sights on dark matter
https://phys.org/news/2021-12-gravitati ... -dark.html
by Cardiff University
The technologies behind one of the biggest scientific breakthroughs of the century—the detection of gravitational waves—are now being used in the long-standing search for dark matter.

Thought to make up roughly 85 percent of all matter in the universe, dark matter has never been observed directly and remains one of the biggest unsolved mysteries in modern physics.

With extremely sensitive detectors now at their disposal, already proven through several outstanding discoveries, scientists believe that existing gravitational wave technology has the true potential to finally discover the exotic material and even find out what it is made of.

In a study published today in Nature, a team led by scientists from Cardiff University's Gravity Exploration Institute has taken the first step towards this goal by using the instruments, known as laser interferometers, to look for a new kind of dark matter for the very first time.

Until recently, it was widely believed that dark matter was composed of heavy elementary particles.
User avatar
Yuli Ban
Posts: 4631
Joined: Sun May 16, 2021 4:44 pm

Re: Physics News and Discussions

Post by Yuli Ban »

Tardigrade is first multicellular organism to be quantum entangled
A tardigrade has been quantum entangled with a superconducting qubit – and lived to tell the tale. It is the first time a multicellular organism has been placed in this strange quantum state and raises questions about what it means for living things to be entangled.

Tardigrades are microscopic animals that can survive extreme temperatures and pressures in a hibernating state called a tun. Rainer Dumke and his colleagues at Nanyang Technological University, Singapore, placed one of these hibernating tardigrades on a superconducting qubit
https://arxiv.org/abs/2112.07978
And remember my friend, future events such as these will affect you in the future
weatheriscool
Posts: 12950
Joined: Sun May 16, 2021 6:16 pm

Re: Physics News and Discussions

Post by weatheriscool »

Researchers use electron microscope to turn nanotube into tiny transistor
https://phys.org/news/2021-12-electron- ... istor.html
by Queensland University of Technology
An international team of researchers have used a unique tool inserted into an electron microscope to create a transistor that's 25,000 times smaller than the width of a human hair.

The research, published in the journal Science, involves researchers from Japan, China, Russia and Australia who have worked on the project that began five years ago.

QUT Center for Materials Science co-director Professor Dmitri Golberg, who led the research project, said the result was a "very interesting fundamental discovery" which could lead a way for the future development of tiny transistors for future generations of advanced computing devices.

"In this work, we have shown it is possible to control the electronic properties of an individual carbon nanotube," Professor Golberg said.

The researchers created the tiny transistor by simultaneously applying a force and low voltage which heated a carbon nanotube made up of few layers until outer tube shells separate, leaving just a single-layer nanotube.

The heat and strain then changed the "chilarity" of the nanotube, meaning the pattern in which the carbon atoms joined together to form the single-atomic layer of the nanotube wall was rearranged.
User avatar
caltrek
Posts: 6509
Joined: Mon May 17, 2021 1:17 pm

Re: Physics News and Discussions

Post by caltrek »

Could an Overlooked Quantum Theory Help The Universe Make Sense Again?

https://www.sciencealert.com/pilot-waves

Introduction:
(Science Alert) Back in the 1920s, when the field of quantum physics was still in its infancy, a French scientist named Louis de Broglie had an intriguing idea.

In response to confusion over whether light and matter were fundamentally particles or waves, he suggested an alternative: what if both were true? What if the paths taken by quantum objects were guided by something that rose and fell like an ocean swell?

His hypothesis was the foundation of what would later become pilot wave theory, but it wasn't without its problems. So, like any beautiful idea that falters in the face of experiment, it swiftly became a relic of scientific history.

Today, the majority of physicists subscribe to what's referred to as the 'Copenhagen interpretation of quantum mechanics', which, generally speaking, doesn't give precise locations and momentums to particles until they're measured, and therefore observed.

Pilot wave theory, on the other hand, suggests that particles do have precise positions at all times, but in order for this to be the case, the world must also be strange in other ways – which led to many physicists dismissing the idea.
Don't mourn, organize.

-Joe Hill
User avatar
Yuli Ban
Posts: 4631
Joined: Sun May 16, 2021 4:44 pm

Re: Physics News and Discussions

Post by Yuli Ban »

And remember my friend, future events such as these will affect you in the future
Post Reply