aeolus (The Social Web)

Record-Setting Dark Matter Detector Comes Up Empty -- and That's Good News

Slashdot — Wed, 09 Jul 2025 13:00:00 GMT

An anonymous reader quotes a report from Gizmodo: WIMPs (weakly interacting massive particles) are one of the most serious contenders for dark matter -- the "missing" mass supposedly constituting 85% of our universe. Given its elusiveness, dark matter tests the patience and creativity of physicists. But the latest results from LUX-ZEPLIN (LZ), the South Dakota-based detector, may have brought scientists a small step closer to catching WIMPs in action. In a recent Physical Review Letters paper, scientists analyzed 280 days' worth of data from LUX-ZEPLIN, reporting the tightest ever upper limit on the interaction strength of WIMPs. The result -- a near fivefold improvement -- demonstrates how physicists are increasingly getting better at circumventing the problem that dark matter is, well, dark; the elusive stuff evades any detection method that depends on materials interacting with visible light or other types of radiation. The LUX-ZEPLIN experiment, located one mile underground in a decommissioned South Dakota gold mine, employs nearly 15,000 pounds (7 tons) of liquid xenon. The chemical element's high atomic mass and density make it potentially easier for scientists to detect any unknown particles that may pass through the detector. Also, liquid xenon is transparent, preventing any unwanted noise -- usually arising from radioactive matter around the detector -- from spoiling an experiment. "These results firmly establish that LZ is the world's most sensitive search for dark matter heavier than 10 GeV, that's about 10 times heavier than a proton," explained Scott Haselschwart, a physicist at the University of Michigan and LZ physics coordinator, in an email to Gizmodo. "To put our result in perspective: we have ruled out dark matter that would interact only once in a single kilogram of xenon every four millennia!" "LZ is the most sensitive search for WIMP dark matter to date, but we still have another two years of data to collect," Haselschwart said. "This means that a discovery of dark matter in LZ could come anytime now. We are truly looking for dark matter where no one has ever looked before and that is extremely exciting!"

4.6B Years On, the Sun Is Having a Moment

Y Combinator — Wed, 09 Jul 2025 12:31:56 GMT

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Using MPC for Anonymous and Private DNA Analysis

Y Combinator — Wed, 09 Jul 2025 11:52:29 GMT

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Million Times Million

Y Combinator — Wed, 09 Jul 2025 11:49:21 GMT

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UK Police Dangle $102 Million To Digitize Its VHS Tape Archives

Slashdot — Wed, 09 Jul 2025 10:00:00 GMT

The UK police plan to spend up to 75 million pounds ($102 million) to digitize their vast archive of VHS tapes, aiming to preserve evidence by converting analog media into digital files integrated with evidence management systems. The procurement includes both in-house solutions and outsourced services, with additional funding earmarked for converting other legacy formats like microfiche and DVDs. The Register reports: According to a tender notice published last week, Bluelight Commercial - a not-for-profit buyer that acts on behalf of the emergency services - says the police force requires either in-house technology or outsourced services to convert the arcane magnetic tape format to digital storage. The notice, which sets out procurement plans, says the framework agreement will help forces with the "conversion of analog media to digital records, including metadata for integration with a digital evidence management system." In the first lot of the framework, Bluelight asks for in-house VHS media digitization software, hardware, and training to "enable a Police Force to convert VHS tapes to digital files." This chunk of the arrangement could be worth 50 million pounds ($68 million) for four years, excluding VAT. The second lot asks for outsourced VHS media digitization "for the provision of conversion services delivered completely by a third party with electronic files being returned securely to the customer force." The output is also set to be ingested by a digital evidence management solution. It could be worth up to 25 million pounds ($34 million) over the same period. In addition, Bluelight Commercial is looking for a provider to help with more niche media digitization, including converting microfiche, CD, DVDs to an electronic file format, in an arrangement which could be worth a total of up to 25 million pounds ($34 million).

IKEA ditches Zigbee for Thread going all in on Matter smart homes

Y Combinator — Wed, 09 Jul 2025 09:42:17 GMT

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Astro is a return to the fundamentals of the web

Y Combinator — Wed, 09 Jul 2025 09:18:06 GMT

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ESIM Security

Y Combinator — Wed, 09 Jul 2025 09:13:10 GMT

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Is the doc bot docs, or not?

Y Combinator — Wed, 09 Jul 2025 07:38:29 GMT

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Bug Stories

Y Combinator — Wed, 09 Jul 2025 07:29:52 GMT

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