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Reçu aujourd’hui — 2 décembre 2025

Swiss Illegal Cryptocurrency Mixing Service Shut Down

Par :BeauHD
2 décembre 2025 à 01:25
Longtime Slashdot reader krouic shares a report from Europol: From November 24-28, 2025, Europol supported an action week conducted by law enforcement authorities from Switzerland and Germany in Zurich, Switzerland. The operation focused on taking down the illegal cryptocurrency mixing service Cryptomixer, which is suspected of facilitating cybercrime and money laundering. Three servers were seized in Switzerland, along with the cryptomixer.io domain. The operation resulted in the confiscation of over 12 terabytes of data and more than EUR 25 million worth of Bitcoin. After the illegal service was taken over and shut down, law enforcement placed a seizure banner on the website. Authorities allege that the mixing service laundered over 1.3 billion euros in bitcoin since 2016.

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Smartphones At Age 12 Linked To Worse Health

Par :BeauHD
2 décembre 2025 à 00:45
A new study from the University of Pennsylvania finds that preteens who own smartphones by age 12 have significantly higher odds of depression, obesity, and poor sleep compared to their peers. Axios reports: Kids who owned a smartphone at age 12 were found to have about 31% higher odds of depression, 40% higher odds of obesity and 62% higher odds of insufficient sleep than their peers who didn't have one. The researchers analyzed data from the National Institutes of Health-supported Adolescent Brain Cognitive Development Study assessments conducted between 2016 and 2022. The study included responses from 10,588 youths. Kids who had smartphones were more likely to be female, Black or Hispanic, and from lower-income households. The study has been published in the journal Pediatrics.

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Apple AI Chief Retiring After Siri Failure

Par :BeauHD
2 décembre 2025 à 00:23
Apple's longtime AI chief John Giannandrea is retiring, with former Microsoft and Google AI leader Amar Subramanya stepping in to take over. MacRumors notes the retirement comes after the company's repeated delays in delivering its revamped Siri and internal turmoil that led to an AI team exodus. From the report: Giannandrea will serve as an advisor between now and 2026, with former Microsoft AI researcher Amar Subramanya set to take over as vice president of AI. Subramanya will report to Apple engineering chief Craig Federighi, and will lead Apple Foundation Models, ML research, and AI Safety and Evaluation. Subramanya was previously corporate vice president of AI at Microsoft, and before that, he spent 16 years at Google. He was head of engineering for Google's Gemini Assistant, and Apple says that he has "deep expertise" in both AI and ML research that will be important to "Apple's ongoing innovation and future Apple Intelligence features." Some of the teams that Giannandrea oversaw will move to Sabih Khan and Eddy Cue, such as AI Infrastructure and Search and Knowledge. Khan is Apple's new Chief Operating Officer who took over for Jeff Williams earlier this year. Cue has long overseen Apple services. [...] Apple said that it is "poised to accelerate its work in delivering intelligent, trusted, and profoundly personal experiences" with the new AI team. "We are thankful for the role John played in building and advancing our AI work, helping Apple continue to innovate and enrich the lives of our users," said Apple CEO Tim Cook in a statement. "AI has long been central to Apple's strategy, and we are pleased to welcome Amar to Craig's leadership team and to bring his extraordinary AI expertise to Apple. In addition to growing his leadership team and AI responsibilities with Amar's joining, Craig has been instrumental in driving our AI efforts, including overseeing our work to bring a more personalized Siri to users next year."

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Flock Uses Overseas Gig Workers To Build Its Surveillance AI

Par :BeauHD
2 décembre 2025 à 00:02
An anonymous reader quotes a report from 404 Media: Flock, the automatic license plate reader and AI-powered camera company, uses overseas workers from Upwork to train its machine learning algorithms, with training material telling workers how to review and categorize footage including images people and vehicles in the United States, according to material reviewed by 404 Media that was accidentally exposed by the company. The findings bring up questions about who exactly has access to footage collected by Flock surveillance cameras and where people reviewing the footage may be based. Flock has become a pervasive technology in the US, with its cameras present in thousands of communities that cops use every day to investigate things like carjackings. Local police have also performed numerous lookups for ICE in the system. Companies that use AI or machine learning regularly turn to overseas workers to train their algorithms, often because the labor is cheaper than hiring domestically. But the nature of Flock's business -- creating a surveillance system that constantly monitors US residents' movements -- means that footage might be more sensitive than other AI training jobs. [...] Broadly, Flock uses AI or machine learning to automatically detect license plates, vehicles, and people, including what clothes they are wearing, from camera footage. A Flock patent also mentions cameras detecting "race." It included figures on "annotations completed" and "annotator tasks remaining in queue," with annotations being the notes workers add to reviewed footage to help train AI algorithms. Tasks include categorizing vehicle makes, colors, and types, transcribing license plates, and "audio tasks." Flock recently started advertising a feature that will detect "screaming." The panel showed workers sometimes completed thousands upon thousands of annotations over two day periods. The exposed panel included a list of people tasked with annotating Flock's footage. Taking those names, 404 Media found some were located in the Philippines, according to their LinkedIn and other online profiles. Many of these people were employed through Upwork, according to the exposed material. Upwork is a gig and freelance work platform where companies can hire designers and writers or pay for "AI services," according to Upwork's website. The tipsters also pointed to several publicly available Flock presentations which explained in more detail how workers were to categorize the footage. It is not clear what specific camera footage Flock's AI workers are reviewing. But screenshots included in the worker guides show numerous images from vehicles with US plates, including in New York, Michigan, Florida, New Jersey, and California. Other images include road signs clearly showing the footage is taken from inside the US, and one image contains an advertisement for a specific law firm in Atlanta.

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Austria's Rebel Nuns Refuse To Give Up Instagram To Stay In Their Convent

Par :BeauHD
1 décembre 2025 à 23:20
Three Austrian nuns in their 80s who escaped a care home and reclaimed their old convent are refusing the church's offer to stay because it requires them to quit Instagram, stop speaking to the press, and avoid legal counsel -- conditions they call a gag order. Their standoff with church authorities has now escalated to the Vatican as the nuns continue posting to their 185,000 followers. NPR reports: Before the church authorities moved the nuns into care almost two years ago, the local abbey and Archdiocese of Salzburg acquired the convent. The sisters say they were not aware they were signing away what they understood to be their lifelong right to remain in the cloister. On Friday, their superior, Provost Markus Grasl from Reichersberg Abbey, announced that the sisters can stay. But his offer comes with conditions: The nuns must cease all social media activities, stop talking to the press and forgo seeking legal advice. The nuns have rejected the proposal, and now Grasl has called on the Vatican to intercede. In a statement released Friday, the nuns said the provost's offer is nothing short of a gag order. Speaking via Instagram, Sister Regina said, "We can't agree to this deal. Without the media, we'd have been silenced." Sister Bernadette told Instagram followers: "We need to resolve this but any agreement we reach must be in accordance with God's will and shaped by human reason." [...] The provost's proposed agreement -- which NPR has seen -- also bans laypeople from entering the cloisters, including the sisters' helpers, many of whom they've known for decades and on whom the nuns now depend for help. Speaking to NPR on Monday, the provost's spokesperson, crisis PR manager Harald Schiffl, said that the provost does not understand why the nuns reject his offer and that, in response, he has requested the Vatican authorities responsible for religious orders to step in. The Vatican has not commented on the situation. So while they await news from Rome, the sisters continue to follow the papal Instagram account. Schiffl says the terms relating to the nuns' social media use are reasonable: "The abbey wishes to discontinue the sisters' social media accounts because what they show has very little to do with real religious life."

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Reçu hier — 1 décembre 2025

Zipcar To End UK Operations

Par :BeauHD
1 décembre 2025 à 22:40
"The car-sharing company, first launched in the U.S. in 2000, has been active in the UK since 2010 and has just under half a million members," writes Slashdot reader guesstral. "'I'm writing to let you know that we are proposing to cease the UK operations of Zipcar,' wrote Zipcar UK's general manager, James Taylor, in an email to members today. He went on to say that Zipcar will temporarily suspend new bookings after December 31, pending the outcome of a consultation with its 71 staff members." From the BBC: In its most recent company accounts for 2024, Zipcar blamed the "cost of living crisis," which was affecting UK customers, for revenues falling to 46 million pounds to 53 million the year before, while its after-tax losses had widened to 11.6 million pounds. According to the same accounts, Zipcar membership fees cover the cost of fuelling or charging the vehicle and, as energy costs continued to rise last year, it has added to financial pressures on the company. The company would also be liable for the incoming congestion charge in London that is expanding to include electric vehicles from 26 December, although this was not referenced in Zipcar's email to membership or company accounts.

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Korea's Coupang Says Data Breach Exposed Nearly 34 Million Customers' Personal Information

Par :BeauHD
1 décembre 2025 à 22:00
An anonymous reader quotes a report from TechCrunch: South Korean e-commerce platform Coupang over the weekend said nearly 34 million Korean customers' personal information had been leaked in a data breach that had been ongoing for more than five months. The company said it first detected the unauthorized exposure of 4,500 user accounts on November 18, but a subsequent investigation revealed that the breach had actually compromised about 33.7 million customer accounts in South Korea. The breach affected customers' names, email addresses, phone numbers, shipping addresses, and certain order histories, per Coupang. More sensitive data like payment information, credit card numbers, and login credentials was not compromised and remains secure, the company said. [...] Police have reportedly identified at least one suspect, a former Chinese Coupang employee now abroad, after launching an investigation following a November 18 complaint.

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UK Police To Trial AI 'Agents' Responding To Non-Emergency Calls

Par :BeauHD
27 novembre 2025 à 13:00
An anonymous reader quotes a report from the BBC: Call-handling agents powered by AI are to be trialled by Staffordshire Police in a bid to cut waiting times for the non-emergency 101 service. The force is set to become the third in the country to take part in the scheme testing the use of artificial "agents" to deal with calls. Under the system, the AI agent would deal with simple queries like requests for information without the need for human involvement, freeing up call handlers and reducing answering times. Acting Chief Constable Becky Riggs confirmed the force would be looking to launch the AI pilot early in the new year. "It's a piece of technology called Agentforce. It will help with our response to the public, which historically we know we haven't done well." The senior officer said that sometimes people are not calling to report a crime, but want more information, which the technology could help with. However, if the system detects keywords suggesting vulnerability or risk or emergency, then it will be able to divert the call to a human being.

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Apple Asks Indian Court to Block Antitrust Law Allowing $38 Billion Fine

Par :BeauHD
27 novembre 2025 à 10:00
Apple is challenging a new Indian antitrust law that would let regulators calculate penalties based on global revenue -- a change that could expose the company to a fine of roughly $38 billion in its dispute with Tinder owner Match. The 2022 antitrust case centers on accusations that Apple abused its power by forcing developers to use its in-app purchase system. MacRumors reports: Last year, India passed a law that allows the Competition Commission of India (CCI) to use global turnover when calculating penalties imposed on companies for abusing market dominance. Apple can be fined up to 10 percent, which would result in a penalty of around $38 billion. Apple said that using global turnover would result in a fine that's "manifestly arbitrary, unconstitutional, grossly disproportionate, and unjust." Apple is asking India's Delhi High Court to declare the law illegal, suggesting that penalties should be based on the Indian revenue of the specific unit that violates antitrust law. [...] Apple said in today's filing that the CCI used the new penalty law on November 10 in an unrelated case, fining a company for a violation that happened 10 years ago. Apple said it had "no choice but to bring this constitutional challenge now" to avoid having retrospective penalties applied against it, too. Match has argued that a high fine based on global turnover would discourage companies from repeating antitrust violations. Apple's plea will be heard on December 3.

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China's Giant Underground Neutrino Observatory Releases Its First Results

Par :BeauHD
27 novembre 2025 à 07:00
China's new JUNO neutrino observatory has delivered world-leading measurements after just 59 days, offering the most precise readings yet of two key neutrino oscillation parameters. "The physics result is already world-leading in the areas that it touches," says particle physicist Juan Pedro Ochoa-Ricoux of the University of California, Irvine, who co-leads a team on JUNO. "In particular, we measured two neutrino oscillation parameters, and that measurement is already for both parameters the best in the world." The results were published in two separate preprints on arXiv.org. Scientific American reports: JUNO's spherical detector, which is akin to a 13-story-tall fishbowl, primarily measures so-called electron antineutrinos spewing from the nearby Yangjian and Taishan nuclear plants. When the particles strike a proton inside the detector, a reaction triggers two light flashes that ping photomultiplier tubes and get converted into electrical signals. The new measurements from these neutrino-proton collisions are now considered the most precise for two oscillation parameters, which act as proxies for differences in their mass, according to Ochoa-Ricoux. "It is the first time we've turned on a scientific instrument like JUNO that we've been working on for over a decade. It's just tremendously exciting," Ochoa-Ricoux says. "And then to see that we're able to already do world-leading measurements with it, even with such a small amount of data, that's also really exciting." Still, the physicists will need years' worth of neutrino detections to answer the mass-ordering conundrum.

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Mexico Unveils Plans To Build Most Powerful Supercomputer In Latin America

Par :BeauHD
27 novembre 2025 à 03:30
An anonymous reader quotes a report from the Associated Press: Mexico unveiled plans Wednesday to build what it claims will be Latin America's most powerful supercomputer -- a project the government says will help the country capitalize on the rapidly evolving uses of artificial intelligence and exponentially expand the country's computing capacity. Dubbed "Coatlicue" for the Mexica goddess considered the earth mother, the supercomputer would be seven times more powerful than the region's current leader in Brazil, Jose Merino, head of the Telecommunications and Digital Transformation Agency. President Claudia Sheinbaum said during her morning news briefing that the location for the project had not been decided yet, but construction will begin next year. "We're very excited," said Sheinbaum, an academic and climate scientist. "It is going to allow Mexico to fully get in on the use of artificial intelligence and the processing of data that today we don't have the capacity to do." Merino said that Mexico's most powerful supercomputer operates at 2.3 petaflops -- a unit to measure computing speed, meaning it can perform one quadrillion operations per second. Coatlicue would have a capacity of 314 petaflops.

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Amazon Faces FAA Probe After Delivery Drone Snaps Internet Cable In Texas

Par :BeauHD
27 novembre 2025 à 02:02
Amazon's drone-delivery program is under federal scrutiny after an MK30 aircraft clipped an internet cable in Texas. CNBC reports: The incident occurred on Nov. 18 around 12:45 p.m. Central in Waco, Texas. After dropping off a package, one of Amazon's MK30 drones was ascending out of a customer's yard when one of its six propellers got tangled in a nearby internet cable, according to a video of the incident viewed and verified by CNBC. The video shows the Amazon drone shearing the wire line. The drone's motor then appeared to shut off and the aircraft landed itself, with its propellers windmilling slightly on the way down, the video shows. The drone appeared to remain in tact beyond some damage to one of its propellers. The Federal Aviation Administration is investigating the incident, a spokesperson confirmed. The National Transportation Safety Board said the agency is aware of the incident but has not opened a probe into the matter. Amazon confirmed the incident to CNBC, saying that after clipping the internet cable, the drone performed a "safe contingent landing," referring to the process that allows its drones to land safely in unexpected conditions. "There were no injuries or widespread internet service outages. We've paid for the cable line's repair for the customer and have apologized for the inconvenience this caused them," an Amazon spokesperson told CNBC, noting that the drone had completed its package delivery.

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Greek Cybercrime Unit Shuts Down IPTV Pirates, 68 End Users Face Fines

Par :BeauHD
27 novembre 2025 à 01:25
Greek authorities shut down an IPTV piracy operation on Santorini, arresting a reseller and referring 68 end users for prosecution. TorrentFreak reports: A new legal framework to tackle online infringement in Greece went live just a couple of months ago, and reports of prosecutions are already coming in. Early September, it was reported that a man from Sparta faces prosecution and a fine of up to 6,000 euros for two IPTV piracy offenses. The suspect, reportedly a cafe owner, was targeted at his workplace on a Saturday, allegedly in front of customers. One told local media that they believed that complaints of the cafe engaging in "unfair competition" preceded the untimely visit. The Cybercrime Prosecution Directorate launched their operation in the early hours of November 19. The Athens-based unit targeted a network that sold illicit access to premium pay-TV via IPTV subscriptions. The raid, conducted on Santorini, one of the Cyclades islands, resulted in the arrest of a 48-year-old, who, from police reports, appears to be a reseller for a larger network. Customers were reportedly charged 50 euros for 3 months subscription or 100 euros for 6 months. Sales and management were handled by the 48-year-old via an online platform known as a 'panel,' while remote and in-person support were available as part of the service. The impact of the raid was visible on the islands, locals said. According to a local report, hundreds of users in hotels, cafes, and residences on Santorini and beyond, found themselves suddenly without access to cheap TV. Apparently few areas were untouched by the disruption, such was local reliance on illegal streams.

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Google's AirDrop Support For Pixel 10 Likely Exists Because of EU's Apple Ruling

Par :BeauHD
27 novembre 2025 à 00:45
Last week, Google surprised the tech world when it announced AirDrop support on Pixel 10 devices -- all without Apple's involvement. "While it initially seemed like this was a rogue move made by Google to coerce Apple into another boundary-breaking decision, it might actually be part of the repercussions that also led to USB-C on iPhone and the adoption of RCS," reports 9to5Google. From a report: As reported by Ars Technica, the answer to this week's mysterious Quick Share upgrade lies in the EU's interoperability requirements designed for the DMA. The ruling out of the European Commission pushed Apple to begin supporting interoperable wireless standards beginning with this year's set of OS upgrades, replacing the previous proprietary standard the company used to power its various Continuity features. That forced Apple to add support for the Wi-Fi Alliance's Wi-Fi Aware standard of multi-directional file sharing, at the cost of completely phasing out its previous walled-in protocol.

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OpenAI Says Dead Teen Violated TOS When He Used ChatGPT To Plan Suicide

Par :BeauHD
27 novembre 2025 à 00:02
An anonymous reader quotes a report from Ars Technica: Facing five lawsuits alleging wrongful deaths, OpenAI lobbed its first defense Tuesday, denying in a court filing that ChatGPT caused a teen's suicide and instead arguing the teen violated terms that prohibit discussing suicide or self-harm with the chatbot. The earliest look at OpenAI's strategy to overcome the string of lawsuits came in a case where parents of 16-year-old Adam Raine accused OpenAI of relaxing safety guardrails that allowed ChatGPT to become the teen's "suicide coach." OpenAI deliberately designed the version their son used, ChatGPT 4o, to encourage and validate his suicidal ideation in its quest to build the world's most engaging chatbot, parents argued. But in a blog, OpenAI claimed that parents selectively chose disturbing chat logs while supposedly ignoring "the full picture" revealed by the teen's chat history. Digging through the logs, OpenAI claimed the teen told ChatGPT that he'd begun experiencing suicidal ideation at age 11, long before he used the chatbot. "A full reading of his chat history shows that his death, while devastating, was not caused by ChatGPT," OpenAI's filing argued. [...] All the logs that OpenAI referenced in its filing are sealed, making it impossible to verify the broader context the AI firm claims the logs provide. In its blog, OpenAI said it was limiting the amount of "sensitive evidence" made available to the public, due to its intention to handle mental health-related cases with "care, transparency, and respect." The Raine family's lead lawyer called OpenAI's response "disturbing." "They abjectly ignore all of the damning facts we have put forward: how GPT-4o was rushed to market without full testing. That OpenAI twice changed its Model Spec to require ChatGPT to engage in self-harm discussions. That ChatGPT counseled Adam away from telling his parents about his suicidal ideation and actively helped him plan a 'beautiful suicide.' And OpenAI and Sam Altman have no explanation for the last hours of Adam's life, when ChatGPT gave him a pep talk and then offered to write a suicide note." OpenAI is leaning on its usage policies to defend against this case, emphasizing that "ChatGPT users acknowledge their use of ChatGPT is 'at your sole risk'" and that Raine should never have been allowed to use the chatbot without parental consent.

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Newegg Sparks Debate With New PayPal-Integrated AI Shopping Push

Par :BeauHD
26 novembre 2025 à 23:20
BrianFagioli writes: Newegg's new partnership with PayPal is another sign that mainstream e-commerce is shifting control from users to AI-driven intermediaries. Instead of shoppers visiting Newegg directly, PayPal's agentic commerce system pushes product discovery through AI platforms like Perplexity where recommendations, checkout, and fraud checks all happen inside someone else's controlled environment. Newegg stays the merchant of record, but the real influence shifts to the platforms that decide which products their AI agents mention. That may sound convenient, but it also means discovery becomes guided by training data and commercial integrations rather than user intent. Slashdot readers will likely notice the other issue. This setup puts PayPal deeper into the shopping pipeline at a time when many users already avoid the company over account freezes and dispute policies. An AI-mediated shopping experience where PayPal becomes the silent gatekeeper by default is not going to sit well with everyone. And with AI agents shaping purchasing decisions based on behavior and context, the concept of intent-driven shopping starts to look a lot like quiet nudging rather than empowerment. Newegg may see this as the future, but the community will probably ask whether users truly want AI systems and PayPal deciding how they shop.

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European Lawmakers Seek EU-Wide Minimum Age To Access AI Chatbots, Social Media

Par :BeauHD
26 novembre 2025 à 21:25
The European Parliament has passed a non-binding resolution urging an EU-wide minimum age of 16 to access social media, video-sharing platforms, and AI chatbots, with parental consent allowed for ages 13-16 and a hard ban for anyone under 13. "It also proposes additional measures, including a ban on addictive design features that keep children hooked to screens and manipulative advertising and gambling-like elements," reports Reuters. Furthermore, the draft "calls for the outright blocking of websites that don't follow EU rules and to address AI tools that can create fake or inappropriate content." The resolution "carries no legal weight" but reflects the growing concern on the issue of AI companions and algorithm-driven platforms even. "Any binding legislation would require formal proposals from the European Commission, followed by negotiations between EU member states and Parliament in a process that typically takes years to complete," notes the report.

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More Than Half of New Articles On the Internet Are Being Written By AI

Par :BeauHD
26 novembre 2025 à 20:45
An anonymous reader quotes a report from the Conversation: The line between human and machine authorship is blurring, particularly as it's become increasingly difficult to tell whether something was written by a person or AI. Now, in what may seem like a tipping point, the digital marketing firm Graphite recently published a study showing that more than 50% of articles on the web are being generated by artificial intelligence. [...] It's important to clarify what's meant by "online content," the phrase used in the Graphite study, which analyzed over 65,000 randomly selected articles of at least 100 words on the web. These can include anything from peer-reviewed research to promotional copy for miracle supplements. A closer reading of the Graphite study shows that the AI-generated articles consist largely of general-interest writing: news updates, how-to guides, lifestyle posts, reviews and product explainers. The primary economic purpose of this content is to persuade or inform, not to express originality or creativity. Put differently, AI appears to be most useful when the writing in question is low-stakes and formulaic: the weekend-in-Rome listicle, the standard cover letter, the text produced to market a business. A whole industry of writers -- mostly freelance, including many translators -- has relied on precisely this kind of work, producing blog posts, how-to material, search engine optimization text and social media copy. The rapid adoption of large language models has already displaced many of the gigs that once sustained them. The dramatic loss of this work points toward another issue raised by the Graphite study: the question of authenticity, not only in identifying who or what produced a text, but also in understanding the value that humans attach to creative activity. How can you distinguish a human-written article from a machine-generated one? And does that ability even matter? Over time, that distinction is likely to grow less significant, particularly as more writing emerges from interactions between humans and AI... "If you set aside the more apocalyptic scenarios and assume that AI will continue to advance -- perhaps at a slower pace than in the recent past -- it's quite possible that thoughtful, original, human-generated writing will become even more valuable," writes author Francesco Agnellini, in closing. "Put another way: The work of writers, journalists and intellectuals will not become superfluous simply because much of the web is no longer written by humans."

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Texas Buys $5 Million In BTC ETF As States Edge Toward First Government Crypto Reserves

Par :BeauHD
26 novembre 2025 à 13:00
Texas has purchased $5 million worth of BlackRock's bitcoin ETF as an initial step toward creating the first state-level bitcoin reserve in the U.S. "[O]ther states having previously invested in such funds with public-employee retirement money," notes CoinDesk. "Michigan has been building such an investment, and Wisconsin sold its $350 million pension-fund stake in the BlackRock ETF in May. From the report: A few weeks ago, Texas moved past its deadline to "capture the industry's best practices so it can utilize these practices in the implementation and management" of its bitcoin BTC reserve, according to its formal request for information issued in September. Entities across the industry provided input on how it could set up and manage the stockpile conceived of in the Texas Strategic Bitcoin Reserve and Investment Act. Last week, the state comptroller's office moved to secure $5 million in BlackRock's iShares Bitcoin Trust (IBIT) as a placeholder, a spokesman for the Texas Comptroller of Public Accounts told CoinDesk on Tuesday. It's an opening move as the state continues to work toward a contract with a custodian, he said, which will take place after it develops its formal request for proposal.

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Study Claims To Provide First Direct Evidence of Dark Matter

Par :BeauHD
26 novembre 2025 à 10:00
An anonymous reader quotes a report from the Guardian: Nearly a century ago, scientists proposed that a mysterious invisible substance they named dark matter clumped around galaxies and formed a cosmic web across the universe. What dark matter is made from, and whether it is even real, are still open questions, but according to a study, the first direct evidence of the substance may finally have been glimpsed. More work is needed to rule out less exotic explanations, but if true, the discovery would go down as a turning point in the decades-long search for the elusive substance that is said to make up 27% of the cosmos. "This could be a crucial breakthrough in unraveling the nature of dark matter," said Prof Tomonori Totani, an astrophysicist at the University of Tokyo, who said gamma rays emanating from the centre of the Milky Way appeared to bear the signature of the substance. [...] To search for potential dark matter signals, Totani analysed data from Nasa's Fermi Gamma-ray Space Telescope, which detects the most energetic photons in the electromagnetic spectrum. He spotted a pattern of gamma rays that appeared to match the shape of the dark matter halo that spreads out in a sphere from the heart of the galaxy. The signal "closely matches the properties of gamma-ray radiation predicted to be emitted by dark matter," Totani told the Guardian. Details are published in the Journal of Cosmology and Astroparticle Physics. If Totani has seen dark matter at work, the observations suggest it is made from elementary particles 500 times more massive than the proton. But far more work is needed to rule out other astrophysical processes and background emissions that could explain the signals. Totani said the "decisive factor" would be detecting gamma rays with the same spectrum from other regions of space, such as dwarf galaxies. According to Prof Justin Read, an astrophysicist at the University of Surrey, the lack of significant signals from such galaxies strongly argues against Totani having seen gamma rays emitted from dark matter particle annihilation. Prof Kinwah Wu, a theoretical astrophysicist at UCL, urged caution, saying: "I appreciate the author's hard work and dedication, but we need extraordinary evidence for an extraordinary claim," he said. "This analysis has not reached this status yet. It is a piece of work which serves as an encouragement for the workers in the field to keep on pressing."

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