Science
Demon hunting: Physicists confirm 67-year-old prediction of massless, neutral composite particle
Researchers have discovered Pines’ demon, a collection of electrons in a metal that behaves like a massless wave.
Newswise — In 1956, theoretical physicist David Pines predicted that electrons in a solid can do something strange. While they normally have a mass and an electric charge, Pines asserted that they can combine to form a composite particle that is massless, neutral, and does not interact with light. He called this particle a “demon.” Since then, it has been speculated to play an important role in the behaviors of a wide variety of metals. Unfortunately, the same properties that make it interesting have allowed it to elude detection since its prediction.
Now, a team of researchers led by Peter Abbamonte, a professor of physics at the University of Illinois Urbana-Champaign, have finally found Pines’ demon 67 years after it was predicted. As the researchers report in the journal Nature, they used a nonstandard experimental technique that directly excites a material’s electronic modes, allowing them to see the demon’s signature in the metal strontium ruthenate.
“Demons have been theoretically conjectured for a long time, but experimentalists never studied them,” Abbamonte said. “In fact, we weren’t even looking for it. But it turned out we were doing exactly the right thing, and we found it.”
The elusive demon
One of the most important discoveries of condensed matter physics is that electrons lose their individuality in solids. Electric interactions make the electrons combine to form collective units. With enough energy, the electrons can even form composite particles called plasmons with a new charge and mass determined by the underlying electric interactions. However, the mass is usually so large that plasmons cannot form with the energies available at room temperature.
Pines found an exception. If a solid has electrons in more than one energy band, as many metals do, he argued that their respective plasmons can combine in an out-of-phase pattern to form a new plasmon that is massless and neutral: a demon. Since demons are massless, they can form with any energy, so they may exist at all temperatures. This has led to speculation that they have important effects on the behavior of multi-band metals.
Demons’ neutrality means that they do not leave a signature in standard condensed matter experiments. “The vast majority of experiments are done with light and measure optical properties, but being electrically neutral means that demons don’t interact with light,” Abbamonte said. “A completely different kind of experiment was needed.”
A serendipitous discovery
Abbamonte recalls that he and his collaborators were studying strontium ruthenate for an unrelated reason—the metal is similar to high-temperature superconductors without being one. Hoping to find clues to why the phenomenon occurs in other systems, they were conducting the first survey of the metal’s electronic properties.
The research group of Yoshi Maeno, a professor of physics at Kyoto University, synthesized high-quality samples of the metal which Abbamonte and former graduate student Ali Husain examined with momentum-resolved electron energy-loss spectroscopy. A nonstandard technique, it uses energy from electrons shot into the metal to directly observe the metal’s features, including plasmons that form. As the researchers were looking through the data, though, they found something unusual: an electronic mode with no mass.
Husain, now a research scientist at Quantinuum, recalled, “At first, we had no idea what it was. Demons are not in the mainstream. The possibility came up early on, and we basically laughed it off. But, as we started ruling things out, we started to suspect that we had really found the demon.”
Edwin Huang, a Moore Postdoctoral Scholar at UIUC and condensed matter theorist, was eventually asked to calculate the features of strontium ruthenate’s electronic structure. “Pines’ prediction of demons necessitates rather specific conditions, and it was not clear to anyone whether strontium ruthenate should have a demon at all,” he said. “We had to perform a microscopic calculation to clarify what was going on. When we did this, we found a particle consisting of two electron bands oscillating out-of-phase with nearly equal magnitude, just like Pines described.”
The importance of just measuring stuff
According to Abbamonte, it was no accident that his group discovered the demon “serendipitously.” He emphasized that he and his group were using a technique that is not widely employed on a substance that has not been well studied. That they found something unexpected and significant is a consequence of simply trying something different, he believes.
“It speaks to the importance of just measuring stuff,” he said. “Most big discoveries are not planned. You go look somewhere new and see what’s there.”
Support was provided by the U.S. Department of Energy, the Japan Society for the Promotion of Science, the National Science Foundation, and the Gordon and Betty Moore Foundation.
Source: University Of Illinois Grainger College Of Engineering
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Oil and gas communities are a blind spot in America’s climate and economic policies
Rangely, Colorado, like many U.S. towns, relies heavily on the oil and gas industry. However, transitioning away from fossil fuels poses economic risks.
Noah Kaufman, Columbia University
On a recent visit to Rangely, a small town in northwest Colorado, my colleagues and I met with the administrators of a highly regarded community college to discuss the town’s economy. Leaving the scenic campus, we saw families driving into the mountains in off-road vehicles, a favorite activity for this outdoors-loving community. With a median household income above US$70,000 and a low cost of living, Rangely does not have the signs of a town in economic distress.
But an existential risk looms over Rangely. The town is here because of an oil boom during World War II. Today, the oil and gas industry contributes over half of the county’s economic output.
Rangely is not unique in the United States, which is the world’s largest producer of oil and natural gas. There are towns across the country that depend on the oil and gas industry for well-paying jobs and public revenues that fund their schools and other critical services.
A heavy dependence on any single industry is risky, and the oil industry is prone to booms and busts. But the economies of oil- and gas-dependent towns face a unique threat from global efforts to address the risks of climate change, which is fueled by the burning of oil and natural gas. Any serious strategy to halt global warming involves policies that will, over time, sharply reduce demand for all fossil fuels.
Early signs of this transformation can be seen in last year’s international agreement to “transition away from fossil fuels” and in the spread of electric vehicles that are starting to displace gasoline- and diesel-powered cars, trucks and buses.
As an economist who worked at the White House during the Obama administration and early Biden administration, I contributed to detailed strategies to reduce greenhouse gas emissions and to support communities in economic distress. But we did not have a plan to prepare oil and gas towns like Rangely for future economic challenges.
Why oil and gas towns are overlooked
Congress has prioritized support for small towns in recent legislation. However, oil- and gas-dependent towns were largely absent from these strategies for three primary reasons.
First is a perceived lack of urgency. The attention to a “just transition” as the nation moves away from fossil fuels has been disproportionately directed to coal-dependent communities. U.S. coal production has declined for 15 years, and a continued transition away from coal appears imminent and inevitable.
In contrast, U.S. production of oil and natural gas continues to grow. To be sure, some oil and gas communities are already struggling. But the widespread economic risks of a shift away from oil and gas may feel more like a problem for future decades.
Second, politicians downplay risks to oil and gas communities.
Most Republicans are not planning for a future decline in oil and gas production at all, and that includes many local politicians in oil and gas-dependent communities. For their part, most Democratic politicians prefer to focus on how climate action can be an engine of future economic growth. President Joe Biden likes to say, “When I think about climate change, I think jobs.”
He is not wrong to highlight the economic opportunities of climate solutions. But clean energy jobs rarely offer one-for-one replacements for the high-paying jobs in the oil and gas industries and the public revenues those industries bring local communities.
Third, economists’ policy toolbox is poorly suited to the challenges facing oil and gas communities.
Proposals to support local economic development commonly suggest targeting persistently distressed local economies with measures such as wage subsidies that have the potential to rapidly put more people to work.
A different prescription is needed for oil and gas communities, which are not generally struggling today. Over the 15-year period prior to the pandemic, the U.S. counties with oil and gas production experienced average annual GDP growth of 2.4% per year, compared with 1.9% nationwide.
Most oil and gas communities do not need economic stimulus policies that provide immediate relief. What they need are holistic economic development strategies that can cultivate new industries – building on their existing strengths – that will enable them to prosper into the future.
https://datawrapper.dwcdn.net/NL6to/1
Solutions to help oil and gas towns prepare
Harvard economist Ricardo Hausmann compares the challenge of developing new economic capabilities to the game of Scrabble, where each additional letter enables the creation of more words. He cites the Finish economy as an example: It evolved from harvesting lumber to making tools that cut wood to producing automated cutting machines. From there, it evolved to sophisticated automated machines, including those used by global corporations such as telecommunications giant Nokia.
Such economic evolutions must be tailored to the characteristics of individual places. But the initial step is to recognize the problem and invest in solutions.
The Southern Ute Indian Tribe is doing this in southwest Colorado. It devotes oil and gas revenues to a Permanent Fund, which promotes fiscal sustainability by ensuring the tribe’s assets are aligned with its long-term financial goals, and a Growth Fund that diversifies the tribe’s revenue sources by investing in a range of businesses.
At the national level, a recent National Academies panel proposed the creation of a federally chartered corporation to help communities facing acute economic threats, including a future decline in oil and gas. This corporation could provide funding for displaced workers, critical public infrastructure and programs that ensure access to economic opportunities.
Colorado’s state Office of Just Transition has started to serve this role. Currently, it focuses only on the transition away from coal, with the goals of helping communities develop new economic opportunities and helping workers transition to new jobs. But its mission could be expanded in the future. In fact, Rangely is already receiving some support due to coal closures nearby.
No one-size-fits-all solution
Small, rural towns like Rangely illustrate how oil- and gas-reliant regions will need unique strategies tailored to the strengths and limitations of individual places. No off-the-shelf playbook exists.
Our group of researchers who visited Rangely are part of the Resilient Energy Economies initiative, which was created by universities, research institutes and philanthropic organizations to ensure that policymakers have the information they need to help fossil fuel-dependent communities successfully navigate the energy transition.
The best time to build a more resilient economy is before a crisis arrives. Anyone familiar with the Bible – or Broadway – knows the story of Joseph, whose dreams foresaw seven years of abundance for Egypt followed by seven years of famine. The pharaoh acted on Joseph’s vision, using the boom to prepare for the bust.
The United States is experiencing abundant oil and gas production today. Policymakers know risks are coming. But so far, the country is failing to prepare communities for harder days to come.
Noah Kaufman, Senior Research Scholar in Climate Economics, Columbia University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Space and Tech
Upcoming Live from the ISS: NASA Astronauts Butch Wilmore and Suni Williams to Discuss Their Mission
NASA astronauts Butch Wilmore and Suni Williams will hold an Earth-to-space call from the ISS on September 13, streamed live on multiple platforms.
Space enthusiasts and media around the world are gearing up for an exciting Earth-to-space call scheduled with NASA astronauts Butch Wilmore and Suni Williams. This news conference is set to take place aboard the International Space Station (ISS) on Friday, September 13, at 2:15 p.m. EDT. The astronauts, who are currently part of Expedition 71/72, will share insights from their experiences in low Earth orbit.
Credit: NASA
Butch Wilmore and Suni Williams
NASA will stream the event live on NASA+, the NASA app, and the agency’s website, offering various platforms for viewers to tune in and experience the wonders of space exploration directly from its current pioneers. The coverage promises not only to highlight the astronauts’ daily activities and scientific endeavors but also provide a real-time connection with those orbiting our planet.
Butch Wilmore and Suni Williams were launched into space aboard Boeing’s Starliner spacecraft on June 5, marking its first crewed flight. They arrived at the ISS the following day. Following a decision to bring back the Starliner uncrewed, the duo’s stay has been extended, and they are now slated to return to Earth in February 2025 with the SpaceX Crew-9 mission aboard a SpaceX Dragon spacecraft.
For media looking to participate in the news conference, NASA’s Johnson Space Center in Houston must be contacted for accreditation by 5 p.m., Thursday, September 12. Media members will need to dial into the conference at least 10 minutes before it begins to ask their questions.
This event offers an invaluable opportunity for the public and the media to engage directly with the astronauts, gaining a deeper understanding of life in space and the ongoing research and operations that continue to push the boundaries of human spaceflight. As Wilmore and Williams continue their critical work on the ISS, this news conference is a much-anticipated chance to connect with the heroes of our final frontier.
To learn more about this event and keep up with the latest news on space station research and operations, visit NASA’s ISS portal.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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News
Avian flu has infected dairy cows in more than a dozen states – a microbiologist explains how the virus is spreading
The H5N1 avian flu has spread from birds to dairy cows, causing significant outbreaks and posing risks to farm workers and other animals, though pasteurized milk remains safe.
Jenna Guthmiller, University of Colorado Anschutz Medical Campus
The current strain of avian flu, H5N1, is responsible for the culling of millions of domestic birds and has sickened more than a dozen farmworkers in 2024, most recently in Colorado.
The Conversation U.S. asked immunologist and microbiologist Jenna Guthmiller from the University of Colorado Anschutz Medical Campus to explain the historical roots of H5N1, its mode of transmission and how to avoid coming into contact with it.
What is H5N1?
H5N1 is a subtype of influenza A viruses. Other commonly known influenza A virus subtypes include H1N1 and H3N2, which cause seasonal outbreaks in humans.
Unlike H1N1 and H3N2, H5N1 largely infects wild birds, with waterfowl such as ducks and geese being the natural reservoirs for H5N1 viruses. Most H5N1 viruses are highly pathogenic avian influenza, meaning spillovers into other bird populations can lead to high mortality rates, including domesticated poultry.
H5N1 viruses were first identified in 1959 due to an outbreak in domesticated chickens in Scotland. In 1996, waterfowl were identified as the natural reservoir for H5N1.
Since its identification, H5N1 viruses have led to four major outbreaks: in 1997, 2003-2005, 2015 and 2021-to-present. The outbreaks in 1997 and 2003-2005 led to substantial spillover to humans.
Since 2003, nearly 900 H5N1 infections in humans have been recorded. Of those infections, more than half were fatal.
Where did H5N1 originate?
The current outbreak of H5N1 started in late 2021 and derives from the virus that caused a major outbreak in 2015.
Since 2021, H5N1 strains have spread to six continents by migratory birds. Spillover to domestic poultry has led to the culling of millions of domestic birds
Researchers have documented the current H5N1 strain in numerous mammals, with it largely affecting aquatic mammals like seals and scavenger mammals. Sporadic spillover to domestic mammals has been recorded, including to minks, goats and alpacas.
In March 2024, the U.S. Department of Agriculture reported an outbreak of H5N1 in lactating dairy cows. As of Aug. 27, 192 herds in 13 states have been confirmed H5N1 positive.
Dairy cow-associated H5N1 viruses have since jumped back into wild birds, and recent outbreaks in domestic poultry resembled H5N1 in dairy cows. Between May and July 2024, 13 confirmed H5N1 infections have occurred in humans, with all cases directly linked to dairy farms and poultry culling. https://www.youtube.com/embed/jhKI2Zskplg?wmode=transparent&start=0 The concern is that the virus could evolve to allow human-to-human transmission.
Why did the avian flu become more widespread?
It is unclear why H5N1 has become such a widespread problem. H5N1, like all influenza viruses, rapidly mutates to infect new hosts. However, H5N1 has several features that could increase its host range.
First, H5N1 viruses use a protein called hemagglutinin that allows H5N1 to infect with new hosts.
Second, my research group identified a mutation in H5N1 viruses causing the dairy cow outbreak that allows hemagglutinin to bind to its receptor more efficiently.
Lastly, H5N1 viruses are mutating genes associated with replication and immune evasion that are known to increase the infection of mammals.
Together, these factors could heighten H5N1 transmission and increase H5N1 spillover to mammals.
How is the strain transmitted to dairy cattle?
H5N1 viruses are largely causing infections in the mammary glands of cattle rather than the respiratory tract, which is the main site of infection for other influenza viruses in mammals. Recent studies have shown that the mammary tissue has receptors for H5N1, which could make this tissue susceptible to infection.
Since the infection is largely restricted to the mammary glands, researchers believe that H5N1 is being transmitted to cows by contaminated milk equipment, particularly the milking apparatus that attaches to the cow udders. Transmission across farms is due to infected cattle movement and shared equipment and personnel across dairy farms.
To reduce transmission, in April 2024, the USDA put in testing requirements for when cows are transported across state lines. In addition, Colorado, the state with the greatest number of positive herds, requires weekly testing on farms to identify infected herds.
What are the risks to people and other animals?
H5N1 does not pose a risk to the general public, as this virus is not known to transmit between people. As all known cases were those with direct contact with infected animals, people with occupational exposure to H5N1-infected cows and poultry continue to be at the greatest risk of infection.
People with occupational hazards should be aware of the H5N1 symptoms – similar to those of a cold – such as congestion, sore throat and fatigue, as well as conjunctivitis, more commonly known as pink eye. For more information, see the Centers for Disease Control and Prevention’s webpage on avian influenza in people.
Domestic and wild animals near dairy farms are at high risk of infection. Particularly, barn cats that have been fed raw milk have been reported dead on dairy farms with infected cows, with these animals coming back positive for H5N1.
In addition, spillover of H5N1 to other domesticated farm animals near infected dairy cows has been recorded.
What are the best ways to keep farm workers safe?
Using personal protective equipment, such as goggles and gloves, remains the best way to prevent the transmission of H5N1 to humans and from humans back to animals. People working around poultry or dairy cattle should also be aware of biosecurity measures, such as not wearing the same clothes and boots when traveling from one farm to another.
Is drinking dairy milk a concern?
As long as you are consuming pasteurized milk products, there are no concerns for infections in humans. Pasteurization is very effective at killing any H5N1 virus that ends up in milk.
People should avoid raw or unpasteurized milk, as H5N1 virus has been found at very high levels in raw milk.
Jenna Guthmiller, Assistant Professor of Immunology and Microbiology, University of Colorado Anschutz Medical Campus
This article is republished from The Conversation under a Creative Commons license. Read the original article.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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