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Top 6 physics News Today

#1
China develops new ultra-cold alloy that can reach -273°C without helium — could enable compact cooling for superconducting quantum chips, military equipment, and beyond
#1 out of 683.33%
science4h ago

China develops new ultra-cold alloy that can reach -273°C without helium — could enable compact cooling for superconducting quantum chips, military equipment, and beyond

https://www.tomshardware.com/tech-industry/china-develops-new-ultra-cold-alloy-that-can-reach-273-c-without-helium-could-enable-compact-cooling-for-superconducting-quantum-chips-military-equipment-and-beyond
Tomshardware.com
  • Chinese researchers report a rare-earth alloy cooling technology reaching near absolute zero without helium-3.
  • The EuCo2Al9 alloy enables a compact, solid-state refrigeration module with adiabatic demagnetization cooling.
  • ADR-based cooling avoids helium-3 and could enable portable cryogenic systems for quantum computers.
  • The research points to potential mass production of pure-metal refrigeration modules based on the alloy.
  • DARPA's early 2024 call emphasizes modular, helium-3-free cooling for defense and quantum tech.
  • The cooling module’s small size may enable portable cryogenic systems for quantum computers.
  • The alloy could help helium-3-free cooling for space and military electronics.
  • Experts highlight ADR has historically struggled to transfer cold to other components.
  • EuCo2Al9 can cool itself and other components efficiently using ADR.
  • The research could enable more scalable quantum computing platforms.
  • The Chinese Academy of Sciences reportedly discussed mass production potential.
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#2
Researchers reach superconductivity at ambient pressure, record high temperature — milestone of -122°C reached by using pressure quenching, still 140 degrees off room temperature target
#2 out of 6
1d ago

Researchers reach superconductivity at ambient pressure, record high temperature — milestone of -122°C reached by using pressure quenching, still 140 degrees off room temperature target

https://www.tomshardware.com/tech-industry/semiconductors/researchers-reach-superconductivity-at-ambient-pressure-record-high-temperature-milestone-of-122-c-reached-by-using-pressure-quenching-still-140-degrees-off-room-temperature-target
Tomshardware.com
  • Researchers report ambient-pressure superconductivity at 151 K from Hg1223 using pressure quenching.
  • The record surpasses the prior 133 K milestone under ambient conditions.
  • Pressure quenching preserves the high-temperature state after decompression.
  • The discovery aims to enable practical superconducting systems at lower costs and simpler setups.
  • The team used Hg1223, a mercury-based cuprate superconductor, in their experiments.
  • High pressure strengthens electron pairing but is usually unstable when decompressed.
  • Ambient-pressure superconductivity could simplify lab tools and accelerate R&D.
  • The study highlights potential applications across electronics, energy, and medical fields.
  • Researchers plan further work to stabilize ambient-temperature superconductivity for practical use.
  • The finding is part of ongoing efforts to push superconductivity research toward real-world viability.
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#3
Science explains why removing adhesive tape makes that unbearable squeaky noise
#3 out of 6
1d ago

Science explains why removing adhesive tape makes that unbearable squeaky noise

https://www.earth.com/news/science-explains-why-removing-adhesive-tape-makes-that-unbearable-squeaky-noise/
Earth.com
  • Latest finding ties tape noise to fast edge cracks that generate shock waves during peeling.
  • The sound comes from pulses when each crack reaches the tape edge and releases air pressure.
  • High-speed imaging shows cracks, not rubbing, drive the screech during stick-slip peeling.
  • Air delays create brief low-pressure gaps that convert into sharp sound pulses.
  • Researchers used schlieren imaging to visualize air-density changes during peeling.
  • The study points toward designing quieter tapes by altering crack initiation and travel.
  • The Physical Review E study broadens understanding of peeling noise beyond a nuisance.
  • Past work linked tape squeaks to cracks; new work pinpoints the edge-triggered pulse.
  • Energy concentration during peeling has attracted interest for triboluminescence observations.
  • Researchers see potential for quieter packaging materials and improved diagnostics.
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#4
Our Universe Has Hidden Dimensions, Scientist Claims—And They’re Close Enough to Touch
#4 out of 6
23h ago

Our Universe Has Hidden Dimensions, Scientist Claims—And They’re Close Enough to Touch

https://www.popularmechanics.com/science/a70771779/universe-hidden-dimensions-theory/
Popularmechanics.com
  • The braneworld model suggests hidden dimensions exist but are unseen because particles stay on a three‑dimensional surface.
  • Physicists compare space to Alice shrinking or growing in a warped room to explain how curvature changes with position.
  • The hierarchy problem concerns different particle sizes; warping in extra dimensions could help explain this.
  • Experiments at the Large Hadron Collider and gravitational wave detectors aim to find higher‑energy particles or phase transitions indicative of braneworlds.
  • Gravitational waves from early-universe phase transitions could reveal braneworld signatures when sensitive detectors like LISA come online.
  • Sundrum notes critiques from quantum gravity experts but says braneworld remains mathematically consistent.
  • The article emphasizes that current data do not confirm extra dimensions, leaving braneworld as a potential but unproven framework.
  • The discussion connects extra dimensions to broader questions about the origins of the universe and gravitational waves.
  • The piece frames braneworld as a testable idea that could reshape our understanding of space, time, and reality.
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#5
ATLAS sets strong limits on supersymmetry
#5 out of 6
23h ago

ATLAS sets strong limits on supersymmetry

https://home.cern/news/news/physics/atlas-sets-strong-limits-supersymmetry
Home.cern
  • ATLAS used machine learning to probe low-energy particles and improve sensitivity in SUSY searches at the LHC.
  • The searches examined disappearing tracks from chargino decays and low-energy leptons from heavier neutralino decays.
  • No evidence of SUSY particles was observed in either search.
  • The results tighten limits on the masses and lifetimes of charginos and neutralinos.
  • The new limits surpass older bounds set by the Large Electron–Positron Collider, the LHC’s predecessor.
  • Results help guide future SUSY searches at the LHC and the High-Luminosity LHC.
  • The Moriond conference featured the presentation of these SUSY search results.
  • The higgsino remains a central focus in SUSY searches due to its connection to dark matter.
  • The analysis used data from the LHC’s second run collected between 2015 and 2018.
  • The effort aims to explore the potential mirror world predicted by supersymmetry.
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#6
Magnetic Interactions Reveal An Exception To A 300-Year-Old Law Of Friction
#6 out of 6
15h ago

Magnetic Interactions Reveal An Exception To A 300-Year-Old Law Of Friction

https://www.iflscience.com/magnetic-interactions-reveal-an-exception-to-a-300-year-old-law-of-friction-82904
Iflscience.com
  • New study finds friction between magnetic layers does not always rise with load and can reverse at close distances.
  • Magnetic realignment in the upper layer drives energy dissipation without wear or contact.
  • Study uses two non-contact magnetic layers to simulate load via magnetic interactions rather than surface roughness.
  • Experiment identifies a specific distance where friction peaks, here around 8.5 millimeters.
  • Researchers aim to tailor friction with ‘friction metamaterials’ by controlling magnetic rearrangements.
  • The work is led by Dr Hongri Gu at the University of Konstanz and colleagues.
  • Magnetic layers are configured with rotating upper magnets and fixed lower magnets to study relative motion.
  • Authors emphasize friction here is due to magnetic moment rearrangements, not surface wear.
  • Nature Materials published the findings, highlighting potential broader impact for material design.
  • The research confirms magnetic interactions can govern friction without traditional contact mechanics.
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