Physics


- Astronomers have detected a strange signal coming from a group of neutron stars that could be the fingerprints of a long-sought elementary particle – and maybe even dark matter. An unexplained excess of X-rays hints at axions, hypothetical “ghost” particles that could solve several long-standing physics puzzles. When massive stars go supernova, they can leave behind neutron stars – extremely dense cores with powerful magnetic fields. A group of neutron stars nicknamed the Magnificent Seven was expected to produce ultraviolet light and low-energy X-rays, but a few years ago astronomers ... [Read More]

Source: newatlas.com

- Spintronics is an emerging area of research that aims to develop devices that transmit, process and store information leveraging the intrinsic angular momentum of electrons, known as spin. A key objective of spintronics studies is to identify strategies to use magnetic insulators to achieve the transport of signals over long distances. Magnetic insulators are a class of materials widely used worldwide, mainly due to their ability to conduct electrical charges. Just like metals conduct electrical charges, magnetic insulators can conduct spins. Nonetheless, as spins are rarely conserved in ... [Read More]

Source: phys.org

- Tiny gems help scientists shed light on thermal conductivity. Using tiny diamonds, or nanodiamonds, scientists have worked out how to measure heat transfer inside living cells – something they say that until now has proved difficult. “A cell’s thermal conductivity – the rate that heat can flow through an object if one side is hot and another is cold – has remained mysterious,” says Taras Plakhotnik from the University of Queensland, co-author of a study published in the journal Science Advances . But understanding this is critical to clarify how internal heat is generated and ... [Read More]


- Liquids are ubiquitous in Nature: from the water that we consume daily to superfluid helium which is a quantum liquid appearing at temperatures as low as only a few degrees above the absolute zero. A common feature of these vastly different liquids is being self-bound in free space in the form of droplets. Understanding from a microscopic perspective how a liquid is formed by adding particles one by one is a significant challenge. Recently, a new type of quantum droplets has been experimentally observed in ultracold atomic systems. These ones are made of alkaline atoms which are cooled down ... [Read More]

Source: phys.org

- Scientists are able to selectively knockout nucleons and preformed nuclear clusters from atomic nuclei using high-energy proton beams. In an experiment the existence of preformed helium nuclei at the surface of several tin isotopes could be identified in a reaction. The results confirm a theory, which predicts the formation of helium clusters in low-density nuclear matter and at the surface of heavy nuclei. The experiment was performed at the Research Center for Nuclear Physics (RCNP) in Osaka. The research team, lead by scientists from TU Darmstadt and the GSI Helmholtz Center for Heavy-Ion ... [Read More]


- Albert Einstein's theory of general relativity profoundly changed our thinking about fundamental concepts in physics, such as space and time. But it also left us with some deep mysteries. One was black holes , which were only unequivocally detected over the past few years. Another was "wormholes" – bridges connecting different points in spacetime, in theory providing shortcuts for space travellers. Wormholes are still in the realm of the imagination. But some scientists think we will soon be able to find them, too. Over the past few months, several new studies have suggested intriguing ways ... [Read More]


- Entangled photons have been sent between two drones hovering a kilometre apart, demonstrating technology that could form the building blocks of a quantum internet. When a pair of photons are quantum entangled, you can instantly deduce the state of one by measuring the other, regardless of the distance separating them. This phenomenon, which Albert Einstein dismissively called “spooky action at a distance”, is the basis of quantum – using entangled particles to ensure communications are secret. Quantum networks are far more secure than the existing internet because any attempt to ... [Read More]


- For decades, scientists have wrestled with a complex mystery of physics: Could the immense amounts of energy theoretically produced by rotating black holes ever be tapped by human hands? If future societies were somehow able to pull off this magnificent feat, the power supply of far-off galactic civilisations would seemingly be assured - and now scientists have a new explanation for how such an exotic extraction might one day be possible. "Black holes are commonly surrounded by a hot 'soup' of plasma particles that carry a magnetic field," explains astrophysicist Luca Comisso from Columbia ... [Read More]


- The French company Leti makes giant wafers full of devices, and, after measuring, researchers at the Niels Bohr Institute, University of Copenhagen, have found these industrially produced devices to be suitable as a qubit platform capable of moving to the second dimension, a significant step for a working quantum computer. The result is now published in Nature Communications The result realized at the Niels Bohr Institute shows that it is now possible to control single electrons, and perform the experiment in the absence of a magnetic field. So the next step will be to look for spins – spin ... [Read More]


- Superconductivity already has a variety of practical applications, such as medical imaging and levitating transportation like the ever-popular maglev systems. However, to ensure that the benefits of applied superconductors keep spreading further into other technological fields, we need to find ways of not only improving their performance, but also making them more accessible and simpler to fabricate. In this regard, magnesium diboride (MgB 2 ) has attracted the attention of researchers since its discovery as a superconductor with multiple advantages. It is a lightweight, easily processible ... [Read More]

Source: phys.org

- Jan. 8 (UPI) -- An international team of scientists has shown that temperature differences in a superconductor can be used to trigger quantum entanglement. The discovery, recounted Friday in the journal Nature Communications , promises to accelerate the development of everyday quantum devices. Quantum entanglement describes the inextricable link between multiple particles, whereby the measure or manipulation of one particle is observed in the others, regardless of time or location. This phenomena "Quantum entanglement is the cornerstone of the novel quantum technologies," study co-author ... [Read More]

Source: upi.com