Physics

New theory on the origin of dark matter

Only a small part of the universe consists of visible matter. By far the largest part is invisible and consists of dark matter and dark energy. Very little is known about dark energy, but there are many theories and experiments on the existence of dark matter designed to find these as yet unknown particles. Scientists at Johannes Gutenberg University Mainz (JGU) in Germany have now come up with a new theory on how dark matter may have been formed shortly after the origin of the universe.

Scientists probe the conditions of stellar interiors to measure nuclear reactions

Most of the nuclear reactions that drive the nucleosynthesis of the elements in our universe occur in very extreme stellar plasma conditions. This intense environment found in the deep interiors of stars has made it nearly impossible for scientists to perform nuclear measurements in these conditions -- until now.

New technique to suppress sound waves from disorder to improve optical fiber communication

New research has revealed a new technique by which scattering of sound waves from disorder in a material can be suppressed on demand. All of this, can be simply achieved by illuminating with the appropriate color of laser light. The result could have a wide-ranging impact on sensors and communication systems.

Record for fastest light pulse set

A research team has demonstrated a 53-attosecond X-ray flash, opening the door to shoot slow-motion video of electrons and atoms in living cells.

Optical coherence tomography with XUV radiation at laboratory scale

For the first time, physicists used extreme ultraviolet radiation (XUV) for this process, which was generated in their own laboratory, and they were thus able to perform the first XUV coherence tomography at laboratory scale. This radiation has a wavelength of between 20 and 40 nanometers - from which it is therefore just a small step to the X-ray range.

Nanocrystalline LEDs: Red, green, yellow, blue …

The color of the light emitted by an LED can be tuned by altering the size of their semiconductor crystals. Researchers have now found a clever and economical way of doing just that, which lends itself to industrial-scale production.

Scientists closer to explaining why matter persists over antimatter

New results show a difference in the way neutrinos and antineutrinos behave, which could help explain why there is so much matter in the universe.

Solar Eclipse Geometry

What's happening in space and on Earth.

Eclipse 2017: Darkness Is Coming

Millions of Americans will watch our sun disappear on August 21.

Air travel: Researchers say factors like plane size and boarding method can have a huge impact on infection rates

Air travel may be the quickest way to get to your vacation destination, but it's also one of the speediest ways for infectious diseases to spread between people, cities and countries.

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