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    Category Physics

    Latest dark energy survey data suggest possible variations in dark energy over time

    March 20, 2025, Categories  Astronomy/Space, Physics

    Latest dark energy survey data suggest possible variations in dark energy over time
    The Dark Energy Camera (DECam), fabricated by the Department of Energy (DOE), is mounted on the Víctor M. Blanco 4-meter Telescope at the Cerro Tololo Inter-American Observatory (CTIO) in north-central Chile. Telescope construction started in 1969 with the casting of the primary mirror. The assembly at the Cerro Tololo mountaintop was finished in 1974. Upon completion of construction it was the 3rd largest telescope in the world, behind the 200-inch Hale telescope at Palomar Observatory in California and the BTA-6 in southern Russia, and was the largest in the Southern Hemisphere (a title that it held for 22 years). It was later named in 1995 in honor of Víctor M. Blanco, Puerto Rican astronomer and former director of CTIO. Credit: DOE/FNAL/DECam/R. Hahn/CTIO/NOIRLab/NSF/AURA 

    A new...

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    Dialing in the temperature needed for precise nuclear timekeeping

    March 19, 2025, Categories  Physics, Technology/Electronics

    For decades, atomic clocks have been the pinnacle of precision timekeeping, enabling GPS navigation, cutting-edge physics research, and tests of fundamental theories. But researchers at JILA, led by JILA and NIST Fellow and University of Colorado Boulder physics professor Jun Ye, in collaboration with the Technical University of Vienna, are pushing beyond atomic transitions to something potentially even more stable: a nuclear clock.

    This clock could revolutionize timekeeping by using a uniquely low-energy transition within the nucleus of a thorium-229 atom. This transition is less sensitive to environmental disturbances than modern atomic clocks and has been proposed for tests of fundamental physics beyond the Standard Model.

    This idea isn’t new in Ye’s laboratory...

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    New AI model can estimate a person’s true biological age from five drops of blood

    March 18, 2025, Categories  Physics, Technology/Electronics

    Top Left: A small blood sample is analyzed to measure 22 key steroids, and the data is fed into an AI system to calculate biological age. Top Right: The AI-predicted biological age (BA) shows a general correlation with chronological age (CA), but individual differences widen over time. Bottom: Using the metaphor of a “river widening as it flows downstream,” the illustration visualizes how biological age evolves with the passage of time. Credit: Zi Wang

    We all know someone who seems to defy aging—people who look younger than their peers despite being the same age. What’s their secret? Scientists at Osaka University (Japan) may have found a way to quantify this difference...

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    Holograms with a twist: Entangling light and information

    March 16, 2025, Categories  Physics, Technology/Electronics

    Quantum holograms using polarized light and metasurfaces enable precise control over entangled holographic information, advancing practical applications in quantum communication and anticounterfeiting technologies

    Quantum entanglement is a fundamental phenomenon in nature and one of the most intriguing aspects of quantum mechanics. It describes a correlation between two particles, such that measuring the properties of one instantly reveals those of the other, no matter how far apart they are. This unique property has been harnessed in applications such as quantum computing and quantum communication.

    A common method for generating entanglement is through a nonlinear crystal, which produces photon pairs with entangled polarizations via spontaneous parametric down-conversion (SPDC)...

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