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Physics & Mathematics

Closeup of ant with object in its jaws

These ants don’t just walk randomly; they “meander” systematically

Categories Life & Non-humans, Physics & Mathematics

When a beam of light is shone into a water droplet, the light is trapped inside the droplet.

Creating an ‘optical atom’ with water and light

University of Gothenburg

Categories Physics & Mathematics, Technology

Illustration of two a chip comprising two entangled quantum light sources

Quantum physicists make major advance in entanglement

University of Copenhagen

Categories Physics & Mathematics

This NASA Hubble Space Telescope image shows the distribution of dark matter in the center of the giant galaxy cluster Abell 1689, containing about 1,000 galaxies and trillions of stars. Dark matter is an invisible form of matter that accounts for most of the universe’s mass. Hubble cannot see the dark matter directly. Astronomers inferred its location by analyzing the effect of gravitational lensing, where light from galaxies behind Abell 1689 is distorted by intervening matter within the cluster. Researchers used the observed positions of 135 lensed images of 42 background galaxies to calculate the location and amount of dark matter in the cluster. They superimposed a map of these inferred dark matter concentrations, tinted blue, on an image of the cluster taken by Hubble’s Advanced Camera for Surveys. If the cluster’s gravity came only from the visible galaxies, the lensing distortions would be much weaker. The map reveals that the densest concentration of dark matter is in the cluster’s core. Abell 1689 resides 2.2 billion light-years from Earth. The image was taken in June 2002. Image credit: NASA, ESA, D. Coe (NASA Jet Propulsion Laboratory/California Institute of Technology, and Space Telescope Science Institute), N. Benitez (Institute of Astrophysics of Andalusia, Spain), T. Broadhurst (University of the Basque Country, Spain), and H. Ford (Johns Hopkins University)

A new model for dark matter

University of Michigan

Categories Physics & Mathematics, Space

Image from simulation of ice XVIII. Oxygen ions (red) occupy a regular crystal lattice, while protons (white) diffuse like a liquid

Exotic Ice Helps Explains Uranus, Neptune Magnetic Mysteries

Categories Physics & Mathematics, Space

Astronomers capture radio signal from distant galaxy

McGill University

Categories Physics & Mathematics, Space

A simple version of a Petri net for COVID infection. The starting point is a non-infected person. “S” denotes “susceptible”. Contact with an infected person (“I”) is an event which leads to two persons being infected. Later another event will happen, removing a person from the group of infected. Here, “R” denotes “recovered” which in this context could be either cured or dead. Either outcome would remove the person from the infected group.

COVID calculations spur solution to vexing computer science problem

University of Copenhagen

Categories Health, Physics & Mathematics

Mathematics Tony Yue Yu

The mystery and power of the “non-Archimedean” world

Categories Physics & Mathematics

A confocal microscope image of molten dark chocolate.

Why chocolate feels so good: It’s the lubrication

University of Leeds

Categories Physics & Mathematics

This artist’s conception shows a late-stage galaxy merger and its two newly-discovered central black holes. The binary black holes are the closest together ever observed in multiple wavelengths.

Doomed pair of supermassive black holes the closest to collision ever seen

Flatiron Institute

Categories Physics & Mathematics, Space

$Massively parallel universal linear transformations using a wavelength-multiplexed diffractive deep neural network.$

Optical Computing Takes a Giant Leap Forward: New Technique Allows for Massively Parallel, Energy-Efficient Processing

Categories Physics & Mathematics, Technology

Pictured above: Artist's depiction of our Milky Way galaxy and its small galaxy companions surrounded by a giant halo of million-degree gas. Credit: NASA/CXC/M.Weiss/Ohio State/A Gupta et al

Milky Way’s Halo Surprisingly Empty

Categories Physics & Mathematics, Space

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