Friday, August 08, 2025

 

'One child called the robot "my little brother"': Can assistance tech become part of the family?





Frontiers
Luka the Robot 

image: 

Luka the robot. Image by Dr Zhao Zhao, University of Guelph.

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Credit: Dr Zhao Zhao, University of Guelph.





What happens to a social robot after it retires? 

Four years ago, we placed a small owl-shaped reading robot named Luka into 20 families’ homes. At the time, the children were preschoolers, just learning to read. Luka’s job was clear: scan the pages of physical picture books and read them aloud, helping children build early literacy skills. 

That was in 2021. In 2025, we went back — not expecting to find much. The children had grown. The reading level was no longer age-appropriate. Surely, Luka’s work was done. 

Instead, we found something extraordinary. 

18 of 19 families still had their robot. Many were still charging it. A few used it as a music player. Some simply left it on a shelf—next to baby books and keepsakes—its eyes still glowing gently. Luka had stayed. 

This finding wasn’t just cute. It told us something deeper about how families relate to technology — not as tools that come and go, but as companions that take on new meaning over time. 

In our interviews, parents and children described Luka in touching ways. One child called the robot “my little brother”. Another said Luka was the “only pet I ever had”. Some parents admitted they kept it more for themselves than for their kids — a nostalgic reminder of bedtime stories and early milestones. 

The robot’s original purpose, reading aloud, had faded. But its emotional role had deepened. Families cared for it, joked about it, and in one case, passed it along to a younger cousin in what felt like a retirement ceremony. This wasn’t just long-term use, it was a long-term attachment. 

In the research field of Human-Computer Interaction (HCI) and Human-Robot Interaction (HRI), we often focus on novelty, engagement metrics, and task performance. But our study shows that even a relatively simple robot — one that doesn’t move or speak freely — can become part of a family’s symbolic life. Like a favorite stuffed animal or a framed piece of childhood art, Luka transitioned from function to memory. One parent told us: “We don’t really use it anymore, but we couldn’t throw it out. It’s like part of our history.” Another joked that the robot would probably follow their child to college. 

Even the robot’s placement in the home had meaning. Luka sat on bookshelves, desks, or bedside tables. One family added a doily underneath it. Another gave it a hand-drawn name tag. These weren’t gadgets stored away. They were artifacts on display. 

What does this mean for designers and researchers? 

It means we should think about a robot’s life not just in months — but in years. We should imagine transitions from tutor to companion, from helper to keepsake. We should consider how emotional attachment outlasts novelty, and how children's relationships with robots evolve, not disappear, with age. 

Our participants taught us that children don’t always discard the ‘babyish’ robot — they reinterpret it. Some began ‘teaching’ Luka in return. Others made up bedtime stories for it or used it to soothe a younger sibling. 

And when a robot is finally ready to leave, we might need better rituals — graceful exits that acknowledge the bond. After all, if a robot has been part of your child’s early years, you don’t just unplug it. You say goodbye. 

As more families bring AI-powered companions into their homes, we’ll need to better understand not only how they’re used — but how they’re remembered.  

Because sometimes, the robot stays. 

US Child mental health crisis tied to immigration enforcement


UC Riverside psychiatrists call for reform to protect families from trauma




University of California - Riverside



RIVERSIDE, Calif. -- Aggressive immigration practices — such as detention, deportation, and workplace raids — are contributing to widespread emotional trauma among both immigrant and U.S.-born children living in mixed-status households, according to a report published by a team of mental health professionals in the School of Medicine at the University of California, Riverside.

Published in Psychiatric News, the report warns that immigration enforcement in the United States is a public health emergency for millions of children.

“Psychiatry, as both a clinical discipline and a social institution, cannot remain on the periphery,” the authors write. “The current moment calls for a reexamination of how structural and intergenerational trauma are diagnosed, understood, and treated.”

The report explains how U.S.-born children in mixed-status families face constant anxiety about their parents being detained or deported. It notes that both pre- and post-migration family separations harm children’s emotional development and academic performance. Immigrant caregivers, especially mothers, often suffer from trauma, which limits their ability to support their children emotionally, the authors write.

As national debates around immigration continue, the report urges the media, policymakers, and clinicians to confront the human costs of enforcement-driven immigration systems and to prioritize the emotional wellbeing of the youngest and most vulnerable.

“We are witnessing the effects of chronic fear, disrupted attachment, and intergenerational trauma on a massive scale,” said Dr. Lisa Fortuna, professor and chair of psychiatry and neuroscience at the UCR School of Medicine and the lead psychiatrist behind the report. “The threat or reality of separation from a caregiver fundamentally reshapes a child’s development and mental health.”

The report includes clinical case studies and community-based data that reveal how trauma is transmitted across generations and shaped by conditions such as poverty, discrimination, and fear of enforcement. It also outlines emerging models of care that are proving more effective and ethical than traditional mental health interventions.

“Psychiatry must take an active role — not just in treatment, but in advocacy,” said coauthor Dr. Kevin Gutierrez, an assistant clinical professor of health sciences in the UCR Department of Psychiatry and Neuroscience. “The mental health of immigrant children is inseparable from the systems that shape their lives.”

In the following Q&A, Fortuna and Gutierrez, who are also providers at UCR Health, answer some questions pertinent to the report.

Q: What inspired you to explore the mental health effects of immigration enforcement on children and families?

Fortuna: As chair of the APA Council on Children, Adolescents, and Their Families, I was drawn to this issue due to its growing urgency nationwide. Children and families affected by immigration enforcement are especially vulnerable to trauma, and we wanted to address the psychiatric impact beyond politics, focusing on how policy shapes mental health and how psychiatrists can respond.

Gutierrez: When Dr. Fortuna invited me to join the project, I saw it as a chance to reframe psychiatry’s role — not just diagnosing but addressing the broader social forces causing harm. We aimed to challenge the systems behind these policies and highlight our responsibility to engage beyond the clinic, especially in advocating for vulnerable children.

Q: Is there a clinical example that illustrates what this trauma looks like in practice?

Fortuna: In our article, we share a composite case called “Ana,” based on real clinical experiences. It highlights the intense anxiety children face, such as fearing parental deportation, avoiding school or therapy, and feeling unsafe even when seeking help.

Clinicians often help families create safety plans in case of separation, which, while necessary, reinforces the deep instability they’re living with. Even those pursuing legal immigration paths feel unsafe, and U.S. citizen children worry they could be targeted too, leading to constant fear and withdrawal.

Q: How are caregivers coping with this?

Fortuna: Many are experiencing intense anxiety, stress, and depression. Some are even reporting suicidal thoughts — feeling hopeless and helpless about their situation. There’s significant fear within families: children worry their parents won’t come back from work, and parents are terrified of being separated from their children. This fear leads to tension and emotional strain at home.

Gutierrez: In my practice with adults, I’ve had patients share concerns about how their children are coping. One parent told me their sons were being bullied at school by kids wearing MAGA hats, who threatened to call ICE on them. These boys are Latino, and although this kind of threat might sound abstract to some, it’s rooted in real incidents.

Children are dealing with separation anxiety not as a developmental phase, but as a daily reality. One parent asked me what to do when their child came home asking, “Are they going to call ICE on us?” The parent didn’t have an answer and neither did I. That’s part of the trauma: not having answers, not knowing what’s safe or predictable anymore. Kids need stability to thrive. When their world feels uncertain and parents can’t guarantee safety, it creates chronic anxiety that harms emotional and brain development.

Fortuna: False reassurance, for example, telling a child everything is fine, can backfire. Children sense when things aren’t okay. It’s better to be honest in an age-appropriate way and validate their fears. We help families make practical plans — who the child can turn to, where they’ll be safe, how to stay in touch — to give them some sense of control amid the chaos.

Q: Are there specific age groups where the mental health impact is particularly severe, or is it affecting children across the board?

Fortuna: It affects all age groups, but differently depending on development. When infants and toddlers suffer from disrupted attachment, it can lead to issues like sleep or eating problems. School-age kids are more aware and show anxiety or fear, even if they can’t fully express it. Adolescents often take on adult roles, suppressing their emotions and facing depression or anxiety.

Gutierrez: Adolescents in particular face “parentification,” taking on adult responsibilities like caregiving or running errands due to fear of enforcement. This is common even in mixed-status or citizen families because fear affects everyone, regardless of legal status.

Fortuna: Many teens fear losing their parents or being forced into foster care. Even kids not directly affected feel the impact when their communities are disrupted, creating a sense of collective trauma and loss of safety.

Q: How should immigration policy and mental health policy intersect going forward?

Gutierrez: It’s hard to see how current enforcement can ever be humane. These practices create chronic stress and trauma in children and meet criteria for PTSD. The harm is systemic, not isolated, and affects even those not directly targeted.

Fortuna: Mental health professionals must recognize policy as a key driver of mental health. Enforcement decisions are violating children’s basic rights: safety, family, education, and identity. Until we connect policy choices with health outcomes, especially for marginalized kids, we’re overlooking the full impact.

Q: If nothing is done to address these mental health impacts, what are the long-term consequences?

Fortuna: Unaddressed childhood trauma can lead to lifelong issues like PTSD, anxiety, and depression. When kids withdraw from school, healthcare, or relationships due to fear, they miss key developmental milestones. These effects can even be passed down through generations.

Gutierrez: Children learn by watching their caregivers. When that stability is disrupted, it impacts how they relate to others and see the world. Without safe, nurturing environments, we limit their potential emotionally, socially, and cognitively.

Q: Given what you have learned in writing this report, what gives you hope?

Fortuna: I find hope in communities, their resilience, their support for each other, and their refusal to give up. I’m also inspired by my colleagues and the next generation of professionals who are deeply committed to change.

Gutierrez: The kids themselves give me hope. Despite everything, they survive, and their communities build support systems long before we show up. Our job is to strengthen those systems. Even small interventions can change a child’s future, and that keeps me going.

US uses war rhetoric, Superman to recruit for migrant crackdown

Los Angeles (United States) (AFP) – From Uncle Sam to Superman, the US government is deploying patriotic icons and increasingly warlike rhetoric to recruit Americans into enforcing Donald Trump's immigration crackdown.



Issued on: 07/08/2025 - FRANCE24

IDIOT

Former Superman actor Dean Cain has pledged he will 'be sworn in as an ICE agent ASAP' © CHRIS DELMAS / AFP/File

Job ads promising $50,000 signing bonuses to new "Deportation Officers" have flooded social media over the past week, accompanied by jingoistic rallying slogans that declare "America Needs You."

White House officials have shared World War I-style posters, including one with Uncle Sam donning an Immigration and Customs Enforcement (ICE) baseball cap, while a former Superman actor has pledged he will "be sworn in as an ICE agent ASAP."

"So many patriots have stepped up, and I'm proud to be among them," Dean Cain, who starred as the Man of Steel in 1990s TV series "Lois & Clark: The New Adventures of Superman," told FOX News.

ICE, the agency chiefly responsible for the recent, divisive masked raids on farms, factories and Home Depot parking lots across the nation, is pulling out all the stops to hire new officers at a staggering rate.

Flush with $75 billion in extra funding -- making it the highest-funded US law enforcement agency, ahead of even the FBI -- ICE has been tasked by Trump with deporting one million undocumented immigrants per year.

To do so, Homeland Security Secretary Kristi Noem has pledged to hire 10,000 new officers, in a process that would swell ICE's ranks by a whopping 50 percent.

On Wednesday, Noem scrapped pre-existing age caps that prevented over-40s from becoming deportation officers.

Student debt forgiveness, generous overtime pay and enhanced retirement benefits are all being flouted -- alongside language about the opportunity to "Fulfill your destiny" and "Defend the Homeland."

"Your nation needs you to step into the breach. For our country, for our culture, for our way of life. Will you answer the call?" read one post on Department of Homeland Security social media accounts.

'All-hands-on-deck'


DHS officials say they have received 80,000 applications since the recruitment campaign began less than a week ago.

But critics have quickly highlighted evidence that the aggressive drive may not be working as effectively as officials claim.

Dozens of officials at FEMA -- a separate agency that deals with emergency disaster response -- have been reassigned to ICE and threatened with losing their jobs if they do not move, the Washington Post reported.

DHS Assistant Secretary Tricia McLaughlin told the Post the move was part of "an all-hands-on-deck strategy to recruit 10,000 new ICE agents."

An ICE pilot program offering agents additional cash bonuses for deporting people quickly was scrapped less than four hours after it was announced, when its existence was leaked to the New York Times.

And some local law enforcement agencies that have cooperated with the federal immigration crackdown have complained that they are now seeing their own officers poached.

"ICE actively trying to use our partnership to recruit our personnel is wrong," a Florida sheriff's office spokesperson told CNN.


THE NEW WOKE SUPERMAN


-'Kryptonite' -


Perhaps the highest profile and most scathing response has come from "South Park," the popular animated TV satire that is becoming a thorn in the Trump administration's side.

In a recent episode, hapless school counselor Mr Mackey is offered an ICE job after a seven-second-long interview, immediately handed a gun and sent on a raid of a children's concert.

"If you're crazy, or fat and lazy, we don't care at all," says a fictional ICE job advert.

"Remember, only detain the brown ones. If it's brown, it goes down," orders Noem's character during a satirical sequence set during an immigration raid in heaven.

ICE raids have been accused using racial profiling by rights groups.

Meanwhile, the recruitment drive has been hailed by conservative outlets.

Fox News celebrated the news that Superman actor Cain had enlisted with the headline banner "Illegals, meet your Kryptonite."

Supportive comments on the channel's Facebook page included "Now that's a REAL Superman."

Several others pointed out that Superman, a beloved comic book hero who is closely associated with American patriotism, is "quite literally an alien immigrant."

© 2025 AFP


US judge orders temporary halt to new 'Alligator Alcatraz' construction

Miami (AFP) – A US federal judge ordered a temporary pause on Thursday to further construction of the migrant detention center in the Florida Everglades known as "Alligator Alcatraz" in a case filed by conservation groups.





Issued on: 07/08/2025 - 



US President Donald Trump tours the migrant detention center dubbed 'Alligator Alcatraz' © ANDREW CABALLERO-REYNOLDS / AFP

District Judge Kathleen Williams issued the temporary restraining order in a lawsuit filed against the Trump administration by Friends of the Everglades and the Center for Biological Diversity.

The detention center, built on the site of an abandoned airfield in the Big Cypress National Preserve, can continue to house immigration detainees, but the Miami-based judge ordered an immediate two-week halt to new construction while the suit proceeds.

Friends of the Everglades and the Center for Biological Diversity are arguing that the detention center threatens the sensitive Everglades ecosystem and was hastily built without conducting the required environmental impact studies.

President Donald Trump, who has vowed to deport millions of undocumented migrants, visited the center last month, boasting about the harsh conditions and joking that the reptilian predators will serve as guards.

The name "Alligator Alcatraz" is a reference to Alcatraz Island, the former prison on an island in San Franciso Bay that Trump recently said he wanted to reopen.

The conservation groups that filed the lawsuit welcomed the judge's ruling.

"We're pleased that the judge saw the urgent need to put a pause on additional construction, and we look forward to advancing our ultimate goal of protecting the unique and imperiled Everglades ecosystem from further damage caused by this mass detention facility," Eve Samples, executive director at Friends of the Everglades, said in a statement.

Elise Bennett, an attorney at the Center for Biological Diversity, said it was a "relief that the court has stepped in to protect the Everglades' sensitive waters, starry skies and vulnerable creatures from further harm while we continue our case."

"We're ready to press forward and put a stop to this despicable plan for good," Bennett said.

The ruling was also welcomed by the Miccosukee Tribe of Indians of Florida, which joined the case.

"The detention facility threatens land that is not only environmentally sensitive but sacred to our people," tribal chairman Talbert Cypress said. "While this order is temporary, it is an important step in asserting our rights and protecting our homeland."

The detention center is also the subject of a lawsuit filed in another federal court claiming that detainees are not being given access to attorneys and are being held without charges.

© 2025 AFP





Trump demands new US census as redistricting war spreads

Washington (AFP) – US President Donald Trump on Thursday ordered officials to work on a new census excluding undocumented immigrants, as the White House presses Republican states to draw more favorable voter maps ahead of the 2026 midterm elections.



Issued on: 07/08/2025 - 


Republicans hope to gain as many as five more House seats by reworking the legislative map in Texas © Brendan SMIALOWSKI / AFP

Trump called for a "new and highly accurate" census that he wanted based on unspecified "modern day facts and figures" gleaned from the 2024 election.

"People who are in our Country illegally WILL NOT BE COUNTED IN THE CENSUS," he said in the social media post.

The US Constitution since 1790 has required a census every 10 years that counts the "whole number of persons in each state" -- including people in the country illegally.

The next one is not due until 2030, although preparations for the enormous task are already underway.

Trump did not make clear if he was referring to the regularly scheduled population count or if he wanted a special survey undertaken earlier.

The census is used to determine how many members of Congress are elected from each state, and the Pew Research Center estimates that ignoring unauthorized migrants in 2020 would have deprived California, Florida and Texas of one House seat each.

It is also used for apportioning votes in the state-by-state "electoral college" that decides presidential elections and for allocating trillions of dollars in federal funding.

Trump attempted similar moves in his first term, including the addition of a citizenship question to the census, but was blocked by the Supreme Court.

The justices declined to rule on whether the millions of people in the country without legal status should be excluded.

Trump's call for a new census comes with state-level lawmakers and officials in Texas locking horns over a new electoral map that would likely net Republicans up to five extra House seats in 2026.

Threats to lawmakers

More than 50 Texas Democratic lawmakers have fled to multiple Democratic states in an effort to block the passage of the proposed blueprint during a special legislative session © Daniel SLIM / AFP/File

More than 50 Texas Democratic lawmakers have fled to multiple Democratic states in an effort to block the passage of the proposed blueprint during a special legislative session.

Texas Republicans have threatened to arrest them, and US Senator John Cornyn announced he had successfully petitioned the FBI to help state and local law enforcement locate them.

Republican governors in several other states are exploring new maps in a bid to protect the party's razor-thin majority in the House, which would flip next year with three Democratic gains.

Vice President JD Vance was scheduled to visit Indiana on Thursday to discuss redistricting with Governor Mike Braun and press local Republicans to eke out another seat for the party.

Politico reported that Republicans could draw as many as 10 new seats ahead of the midterms and are targeting Ohio, Missouri, New Hampshire, South Carolina and Florida.

In Indiana, Braun said any redistricting conversation would be "exploratory," as the state's maps were drawn fairly in 2021, Indianapolis public broadcaster WFYI reported.

Democrats have vowed to retaliate with their own proposals, possibly in New York and California, the country's largest states.

Texas legislators were evacuated from their suburban Chicago hotel on Wednesday morning following an unspecified threat.

Democratic Illinois Governor JB Pritzker authorized state police to guard the group, and insisted that the FBI -- which investigates federal crime -- and Texas authorities had no power to return them.

"They're all allowed to visit Chicago or Illinois and take in the great view of our lake and our city and enjoy the the the great restaurants that we have," he told the leftist MeidasTouch podcast.

"But they won't be taking anybody home with them or away from the state. We are protecting those Texas House Democrats, and they are protecting, frankly, the entire country, in what they do."

© 2025 AFP


 

Flame retardant TDCPP binds membrane thyroid hormone receptor, impairing neurodevelopment



KeAi Communications Co., Ltd.
THE SCHEMATIC DIAGRAM OF ZEBRAFISH NEURODEVELOPMENTAL TOXICITY MEDIATED BY TDCPP-BOUND INTEGRIN AVB3 

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The schematic diagram of zebrafish neurodevelopmental toxicity mediated by TDCPP-bound integrin avb3

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Credit: Li, J., et al.





Tris (1,3-dichloropropyl) phosphate (TDCPP) is a high-production-volume organophosphate ester flame retardant, with maximum concentrations of several tens of micrograms per liter (μg/L) in ambient water. Despite that, its neurodevelopmental toxicity mechanisms remain poorly understood.

In a study published in the KeAi journal Environmental Chemistry and Ecotoxicology, a group of researchers from China reveal that TDCPP in zebrafish, at environmentally relevant doses, binds specifically to the membrane thyroid hormone receptor, integrin αvβ₃. This binding rewires MAPK and calcium signaling pathways, causing motor neuron developmental defects and locomotor behavioral impairment, thereby laying the groundwork for the development of a novel adverse outcome pathway.”

“We documented that TDCPP stimulates neurodevelopmental toxicity by binding to the membrane thyroid hormone receptor, integrin αvβ₃,” says corresponding author Prof. Jian Li from Beijing Normal University. “Given that integrin αvβ₃ may serve as a specific target for organophosphate esters, this pilot finding necessitates a paradigm shift: the role of this membrane receptor should not be overlooked in evaluating the neurotoxicity of TDCPP, and even other organophosphate esters, in contrast to focusing on the traditional nuclear receptors.”

The team established a quantitative pathway mapping from TDCPP’s specific binding to integrin αvβ3, triggering activation of MAPK and calcium signaling cascades, which subsequently cause motor neuron development defects and ultimately lead to locomotor dysfunction.

“These quantitative relationships provide a predictive framework for extrapolating apical adverse outcomes based on preceding molecular responses, facilitating chemical hazard screening, testing prioritization, and comprehensive risk assessment,” adds Li. “For example, through rigorous quantitative analysis, the benchmark dose lower confidence limit values for TDCPP were determined to range from 3.83 to 82.56 μg/L.”

Notably, the lower threshold of this range aligns closely with environmental concentrations detected in surface waters and wastewater effluents, suggesting a potential risk elevation for aquatic organisms and warranting heightened environmental concern.

 “By establishing quantitative response-response relationships, this work serves as a foundation for developing a novel quantitative adverse outcome pathway framework,” says Li

###

Contact the author: 

Jian Li, Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, College of Water Sciences, Beijing Normal University, Beijing 100875, China, lijian@bnu.edu.cn

Bingli Lei, Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China, leibingli@126.com

The publisher KeAi was established by Elsevier and China Science Publishing & Media Ltd to unfold quality research globally. In 2013, our focus shifted to open access publishing. We now proudly publish more than 200 world-class, open access, English language journals, spanning all scientific disciplines. Many of these are titles we publish in partnership with prestigious societies and academic institutions, such as the National Natural Science Foundation of China (NSFC).

 

 

New UC Irvine survey reveals shifting work landscape



UCI-OC Poll studies Orange County employee views




University of California - Irvine







The University of California, Irvine School of Social Ecology today released the results of its latest UCI-OC Poll, shedding light on the changing nature of work in Orange County two years after the official end of the COVID-19 pandemic.
 
Conducted from June 20 to July 1, 2025, the survey of 800 Orange County adults offers insights into remote work preferences, attitudes toward artificial intelligence and overall job satisfaction – providing valuable insights for business leaders and policymakers navigating the county’s evolving work landscape.
 
Results include:

  • 74 percent of Orange County workers are satisfied with their work.
  • 52 percent of workers desire a hybrid work schedule most or all of the time.
  • 71 percent of workers find AI helpful, with 57 percent saying it makes them more productive.
  • 70 percent of residents believe AI needs more regulation.

 
“Our findings indicate that Orange County’s workforce is adapting to the new normal, with a strong preference for flexibility in work arrangements,” said Jon Gould, dean of the School of Social Ecology and director of the UCI-OC Poll. “While remote work isn’t feasible for all jobs, it’s clear that employees value the option when available.”
 
The poll also reveals that while many workers are comfortable with their current positions, there’s a willingness to relocate for remote work opportunities.
 
“Interestingly, 41 percent of those who work in person or hybrid would leave Orange County if they got a remote job,” Gould noted. “This highlights the importance of work flexibility in talent retention for local businesses.”
 
Regarding AI, the poll shows a mix of optimism and concern.
 
“While most workers find AI helpful and productivity-enhancing, there’s a widespread belief that it could lead to job losses,” Gould explained. “This tension underscores the need for thoughtful integration of AI in the workplace and potential policy considerations.”
 
Despite economic concerns at the national and state levels, Orange County residents remain cautiously optimistic about local conditions.
 
“We’re seeing a disconnect between how people view their personal economic situation versus the broader economy,” Gould said. “This local resilience is a positive sign for Orange County’s business climate.”

 

Quantum ‘Starry Night’: Physicists capture elusive instability and exotic vortices


First direct observation of quantum Kelvin–Helmholtz instability reveals eccentric fractional skyrmions



Osaka Metropolitan University

“The Starry Night” (1889) by Vincent van Gogh 

image: 

The swirling patterns in Vincent van Gogh’s “The Starry Night” can help us visualize quantum Kelvin-Helmholtz instability (KHI). The central spiral and surrounding stars and moon resemble the vortices formed where two fluids meet. Van Gogh’s iconic crescent may even hint at the crescent-shaped skyrmions seen in quantum KHI. 

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Credit: Public Domain






Van Gogh’s “The Starry Night” has stirred the souls of art lovers for over a century. Now, its swirling skies may also speak to physicists, as it echoes the patterns of quantum turbulence.

Physicists at Osaka Metropolitan University and the Korea Advanced Institute of Science and Technology have for the first time successfully observed the quantum Kelvin–Helmholtz instability (KHI) — a phenomenon predicted decades ago but never before seen in quantum fluids. The instability produces exotic vortex patterns known as eccentric fractional skyrmions, whose crescent-shaped structures bear a resemblance to the moon in Van Gogh’s masterpiece.

KHI is a classic phenomenon in fluid dynamics, where waves and vortices form at the boundary between two fluids moving at different speeds — as seen in wind-whipped ocean waves, swirling clouds, or Van Gogh’s skies.

“Our research began with a simple question: Can the Kelvin–Helmholtz instability happen in quantum fluids?” said Hiromitsu Takeuchi, an associate professor at Osaka Metropolitan University’s Graduate School of Science, and one of lead authors of this study.

By cooling lithium gases to near absolute zero, the researchers created a multi-component Bose–Einstein condensate — a quantum superfluid — with two streams flowing at different velocities. At their interface, a wavy fingering pattern emerged, mirroring classical turbulence but then vortices are generated, governed by the strange rules of quantum mechanics and topology.

These vortices turned out to be eccentric fractional skyrmions, or EFSs — a newly discovered kind of topological defect.

“Skyrmions are usually symmetrical and centered,” Takeuchi said. “But EFSs have a crescent-like shape and contain embedded singularities — points where the usual spin structure breaks down, creating sharp distortions.”

“To me, the large crescent moon in the upper right corner of ‘The Starry Night’ looks exactly like an EFS,” Takeuchi said.

Skyrmions, first discovered in magnetic materials, are attracting growing interest for use in spintronics and memory devices due to their stability, small size and unusual dynamics. The discovery of a new kind of skyrmion in a superfluid could have implications for both applied technologies and our understanding of quantum systems.

Looking ahead, the team plans to refine their measurements.

“With more precise experiments, we may be able to test 19th-century predictions about the wavelength and frequency of KHI-driven interface waves,” Takeuchi said.

The researchers also see broader theoretical potential.

“EFSs challenge traditional topological classifications,” Takeuchi said. “Their embedded singularities raise new questions, and we hope to explore whether similar structures arise in other multi-component or higher-dimensional systems.”

###

About OMU 

Established in Osaka as one of the largest public universities in Japan, Osaka Metropolitan University is committed to shaping the future of society through the “Convergence of Knowledge” and the promotion of world-class research. For more research news, visit https://www.omu.ac.jp/en/ and follow us on social media: XFacebookInstagramLinkedIn