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Astronomy Feb 29, 2024

How 'the strong force' influences the gravitational wave background

Gravitationally speaking, the universe is a noisy place. A hodgepodge of gravitational waves from unknown sources streams unpredictably around space, including possibly from the early universe.

General Physics Aug 27, 2021

The LIGO/Virgo Collaboration sets new constraints on cosmic strings

The LIGO/Virgo/KAGRA Collaboration, a large group of researchers at different institutes worldwide, has recently set the strongest constraints on cosmic strings to date, using the Advanced LIGO/Virgo full O3 dataset. This ...

General Physics Mar 2, 2021

Theoretical interpretations of the pulsar timing data recently released by NANOGrav

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) is a gravitational-wave detector that monitors areas in the vicinity of Earth using a network of pulsars (i.e., clock-like stars). At the end of ...

General Physics May 21, 2020

Searching for scalar dark matter using compact mechanical resonators

Researchers at University of Delaware, University of Arizona and Haverford College have recently introduced the idea of searching for scalar dark matter using compact acoustic resonators. Their paper, published in Physical ...

General Physics Feb 11, 2016

Gravitational waves detected 100 years after Einstein's prediction

For the first time, scientists have observed ripples in the fabric of spacetime called gravitational waves, arriving at Earth from a cataclysmic event in the distant universe. This confirms a major prediction of Albert Einstein's ...

Optics & Photonics Jun 25, 2014

Spiral-shaped 'light fan' adds new twist to laser-driven plasma accelerators

(Phys.org) —For the past few decades, physicists have been studying the phenomenon of "twisted light," which is light that is twisted like a corkscrew along its axis of travel. Due to the twisting, the light waves at the ...

Quantum Physics Jul 18, 2013

Oxford Questions seek to pull back the curtain on the foundations of quantum physics

(Phys.org) —Relativity and quantum theory form the backbone of modern physics, but a group of physicists stresses that daily use of these theories can numb the sense of wonder at their immense empirical success. At the ...

Astronomy Oct 24, 2011

A second look at supernovae light: Universe's expansion may be understood without dark energy

(PhysOrg.com) -- The 2011 Nobel Prize in physics, awarded just a few weeks ago, went to research on the light from Type 1a supernovae, which shows that the universe is expanding at an accelerating rate. The well-known problem ...

General Physics Sep 13, 2006

General relativity survives gruelling pulsar test -- Einstein at least 99.95 percent right

An international research team led by Prof. Michael Kramer of the University of Manchester's Jodrell Bank Observatory, UK, has used three years of observations of the "double pulsar", a unique pair of natural stellar clocks ...

Mar 15, 2006

Did 'Dark Matter' Create the First Stars?

Dark matter may have played a major role in creating stars at the very beginnings of the universe. If that is the case, however, the dark matter must consist of particles called "sterile neutrinos". Peter Biermann of the ...

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