Archive for the ‘physics’ category: Page 127

Mar 9, 2021

Simulations of the Universe are Getting Better and Better at Matching Reality

Posted by in categories: cosmology, evolution, information science, physics

How can you possibly use simulations to reconstruct the history of the entire universe using only a small sample of galaxy observations? Through big data, that’s how.

Theoretically, we understand a lot of the physics of the history and evolution of the universe. We know that the universe used to be a lot smaller, denser, and hotter in the past. We know that its expansion is accelerating today. We know that the universe is made of very different things, including galaxies (which we can see) and dark matter (which we can’t).

We know that the largest structures in the universe have evolved slowly over time, starting as just small seeds and building up over billions of years through gravitational attraction.

Mar 9, 2021

Astronomers detect best place and time to live in Milky Way

Posted by in categories: physics, space

Astronomers have detected the best place and time to live in the Milky Way, in a recent study published in the journal Astronomy and Astrophysics.

More than six billion years ago, the outskirts of the Milky Way were the safest places for the development of possible life forms, sheltered from the most violent explosions in the universe, that is, the gamma-ray bursts and supernovae.

Also read: Astronomers discover new exoplanet instrumental in hunt for traces of life beyond solar system.

Mar 8, 2021

A magnetic trap captures elusive ultracold plasma

Posted by in categories: energy, physics, space

Pinning plasma within a set of magnetic fields offers physicists a new way to study clean energy, space weather and the inner workings of stars.

Mar 7, 2021

Isadore Singer Transcended Mathematical Boundaries

Posted by in categories: mathematics, physics

A former graduate student reflects on how Isadore Singer, who died on February 11, brought together mathematicians, physicists and anyone else interested in the deeper connections between diverse fields.

Mar 4, 2021

Engineers Have Proposed The First Model For a Physically Possible Warp Drive

Posted by in categories: physics, space travel

The idea of a warp drive taking us across large areas of space faster than the speed of light has long fascinated scientists and sci-fi fans alike. While we’re still a very long way from jumping any universal speed limits, that doesn’t mean we’ll never ride the waves of warped space-time.

Now a group of physicists have put together the first proposal for a physical warp drive, based on a concept devised back in the ’90s. And they say it shouldn’t break any of laws of physics.

Theoretically speaking, warp drives bend and change the shape of space-time to exaggerate differences in time and distance that, under some circumstances, could see travelers move across distances faster than the speed of light.

Mar 4, 2021

For The First Time, Physicists Have Filmed The Oscillation of a Time Crystal

Posted by in category: physics

For the first time, physicists have captured an enigmatic state of matter on video.

Mar 3, 2021

Second Order Optical Merons, or Light Pretending to Be a Ferromagnet

Posted by in category: physics


Scientists have demonstrated how to structure light such that its polarization behaves like a collective of spins in a ferromagnet forming half-skyrmions (also known as merons). To achieve this, the light was trapped in a thin liquid crystal layer between two nearly perfect mirrors. Skyrmions, in general, are found, e.g., as elementary excitations of magnetization in a two-dimensional ferromagnet but do not naturally appear in electromagnetic (light) fields.

One of the key concepts in physics, and science overall, is the notion of a “field” that can describe the spatial distribution of a physical quantity. For instance, a weather map shows the distributions of temperature and pressure (these are known as scalar fields), as well as the wind speed and direction (known as a vector field). Almost everyone wears a vector field on their head — every hair has an origin and an end, just like a vector. Over 100 years ago L.E.J. Brouwer proved the hairy ball theorem which states that you can’t comb a hairy ball flat without creating whorls, whirls (vortices), or cowlicks.

Continue reading “Second Order Optical Merons, or Light Pretending to Be a Ferromagnet” »

Mar 3, 2021

A warp drive that doesn’t break the laws of physics is possible

Posted by in categories: physics, space travel

Previous ideas about how to make these hypothetical devices have required exotic forms of matter and energy that may not exist, but a new idea for a warp drive that doesn’t break the laws of physics may be theoretically possible. However, it may not be practical in the foreseeable future because it requires ultra dense materials.

Mar 2, 2021

Warp Drives Are No Longer Science Fiction

Posted by in categories: business, physics, space travel

NEW YORK—()—Scientists at Applied Physics are excited to announce they have recently constructed the first model of physical warp drives.

“While we still can’t break the speed of light, we don’t need to in order to become an interstellar species” Tweet this

Applied Physics is an independent group of scientists, engineers, and inventors that advise companies and governments on science and technology for both commercial and humanitarian applications.

Mar 2, 2021

How English became the language of physics

Posted by in category: physics

Today, more than 90% of the indexed articles in the natural sciences are published in English. That wasn’t always the case.