Archive for the ‘cosmology’ category: Page 8

Sep 11, 2020

Research team discovers unique supernova explosion

Posted by in category: cosmology

One-hundred million light years away from Earth, an unusual supernova is exploding.

That —which is known as “supernova LSQ14fmg”—was the faraway object discovered by a 37-member international research team led by Florida State University Assistant Professor of Physics Eric Hsiao. Their research, which was published in the Astrophysical Journal, helped uncover the origins of the group of supernovae this star belongs to.

This supernova’s characteristics—it gets brighter extremely slowly, and it is also one of the brightest explosions in its class—are unlike any other.

Sep 10, 2020

Canon’s Next Amazing Lens Might Be an Astrophotographer’s Dream

Posted by in category: cosmology

A good astrophotography lens is one that has a wide focal length and a wide maximum aperture. Normally, this would be a prime lens, but one of Canon’s next major lenses might buck that trend.

Canon Rumors is reporting that an RF 14-21mm f/1.4L USM lens is currently being tested by photographers, after a patent emerged for such a lens early last year. A super-wide aperture ultra-wide angle lens is a ton of fun to shoot with; in fact, when I reviewed the Sigma 14mm f/1.8 DG HSM Art, I called it one of the most fun lenses I have shot with, an evaluation that holds true to this day. Beyond the fun aspect, no doubt, such a lens would be tremendously useful for astrophotographers. At this time, the widest full frame f/1.4 lens is the Sigma 20mm f/1.4 Art, a prime lens. Not only would the rumored RF lens offer a significantly wider field of view at the same maximum aperture, it would also offer a very useful zoom range for astrophotography and nighttime landscape and cityscape work.

There is no word on price or availability yet, but such a lens would definitely be popular among both astrophotographers and event shooters. Would you be interested in one?

Continue reading “Canon’s Next Amazing Lens Might Be an Astrophotographer’s Dream” »

Sep 10, 2020

Quantum Simulations of Curved Space

Posted by in categories: computing, cosmology, mathematics, particle physics, quantum physics

A heptagonal-lattice superconducting circuit, and the mathematics that describe it, provide tools for studying quantum mechanics in curved space.

According to John Wheeler’s summary of general relativity, “space-time tells matter how to move; matter tells space-time how to curve.” How this relationship plays out at the quantum scale is not known, because extending quantum experiments to curved space poses a challenge. In 2019, Alicia Kollár and colleagues at Princeton University met that challenge with a photonic circuit that represents the negatively curved space of an expanding universe [1]. Now, Igor Boettcher and colleagues at the University of Maryland, College Park, describe those experiments with a new theoretical framework [2]. Together, the studies offer a toolkit for studying quantum mechanics in curved space that could help answer fundamental questions about cosmology.

In a universe that expands at an accelerating rate, space curves away from itself at every point, producing a saddle-like, hyperbolic geometry. To project hyperbolic space onto a plane, Kollár’s team etched a centimeter-sized chip with superconducting resonators arranged in a lattice of heptagonal tiles. By decreasing the tile size toward the edge of the chip, the researchers reproduced a perplexing property of hyperbolic space: most of its points exist on its boundary. As a result, photons moving through the circuit behave like particles moving in negatively curved space.

Sep 10, 2020

Center Will Focus on Neutron Star Modeling in ‘Gravitational Wave Era’

Posted by in categories: cosmology, particle physics

This rendering shows the density of matter in the aftermath of two merged neutron stars, resulting in the formation of a black hole. (Credit: David Radice/Pennsylvania State University)

A new Physics Frontier Center at UC Berkeley, supported by the National Science Foundation, expands the reach and depth of existing capabilities on campus and at neighboring Lawrence Berkeley National Laboratory (Berkeley Lab) in modeling one of the most violent events in the universe: the merger of neutron stars and its explosive aftermath.

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Sep 10, 2020

Space Could Be Littered With Eerie Transparent Stars Made Entirely of Bosons

Posted by in categories: cosmology, particle physics

Last year, the astronomical community achieved an absolute wonder. For the very first time, the world collectively laid eyes on an actual image of the shadow of a black hole. It was the culmination of years of work, a magnificent achievement in both human collaboration and technical ingenuity.

And, like the best scientific breakthroughs, it opened a whole new world of enquiry. For a team led by astrophysicist Hector Olivares from Radboud University in the Netherlands and Goethe University in Germany, that enquiry was: how do we know M87 is a black hole?

“While the image is consistent with our expectations on what a black hole would look like, it is important to be sure that what we are seeing is really what we think,” Olivares told ScienceAlert.

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Sep 10, 2020

Researchers Find the Origin and Maximum Mass of Massive Black Holes Observed by Gravitational Wave Detectors

Posted by in categories: cosmology, physics

Through simulations of a dying star, a team of theoretical physics researchers have found the evolutionary origin and the maximum mass of black holes which are discovered by the detection of gravitational waves as shown in Figure 1.

The exciting detection of gravitational waves with LIGO (laser interferometer gravitational-wave observatory) and VIRGO (Virgo interferometric gravitational-wave antenna) have shown the presence of merging black holes in close binary systems.

Sep 10, 2020

Catholic university astrophysicist creates black hole simulation in VR

Posted by in categories: cosmology, virtual reality

A team of researchers from the Instituto de Astrofísica VR Lab at Pontificia Universidad Católica de Chile has released a virtual simulation of the black hole at the center of our galaxy. Known as “Galactic Center VR,” the short video, released on the Chandra X-ray Observatory Youtube channel, offers a 360-degree view of the center of the Milky Way, which takes the viewer through about 500 years of stellar movement.

The simulation puts the viewer in the place of the black hole itself, Sagittarius A*, and allows for full rotation of the camera. The team explains in the video notes that the simulation shows “stellar giants” moving around the galactic center, while “stellar winds” blow off their surfaces to create different colors. Thankfully, they went into a little detail as to what these colors represent. They wrote:

Blue and cyan represent X-ray emission from hot gas with temperatures of tens of millions of degrees, while the red emission shows ultraviolet emission from moderately dense regions of cooler gas with temperatures of tens of thousands of degrees, and yellow shows the cooler gas with the highest densities.

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Sep 9, 2020

The Next Big Thing: New Galaxy Discovered at Outer Rim of the Known Universe

Posted by in category: cosmology

Astronomers at the Keck Observatory in Hawaii say they have found the most distant galaxy yet. Its name is z8_GND_5296, and it is churning out new stars at an astounding rate. The remarkable z8_GND_5296 is believed to be about 30 billion light years away, and continues to gain distance. Scientists are hoping it can provide clues to what happened right after the Big Bang.

The Keck research team determined how far away z8_GND_5296 is by measuring precisely the redness of its light. Since the galaxy is moving away, its light waves are stretched, which makes it appear redder than it truly is. Astronomers call this phenomena redshift. This galaxy holds the redshift record at 7.51, beating the now second furthest galaxy by exactly 0.3. According to Nature, an international weekly science journal, only five known galaxies have a mathematically tested and confirmed redshift “in excess of 7.”

With regard to producing new stars, z8_GND_5296 is unusually productive. Nature says it puts out “about 330 new solar masses per year, which is which is more than a factor of 100 greater than that seen in the Milky Way.” This is even more impressive if one considers z8_GND_5296’s diminutive size. The powerhouse star-producer is only about 1–2% the size of our galaxy. Of the recorded galaxies with redshifts exceeding 7, only one other has a high star-formation rate.

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Sep 9, 2020

Gravitational crystal inside the black hole

Posted by in categories: cosmology, quantum physics

Circa 2015. What if a hull of ship could have warp crystals that could slip through space time easier.

Crystals, as quantum objects typically much larger than their lattice spacing, are a counterexample to a frequent prejudice that quantum effects should not be pronounced at macroscopic distances. We propose that the Einstein theory of gravity only describes a fluid phase and that a phase transition of crystallization can occur under extreme conditions such as those inside the black hole. Such a crystal phase with lattice spacing of the order of the Planck length offers a natural mechanism for pronounced quantum-gravity effects at distances much larger than the Planck length. A resolution of the black-hole information paradox is proposed, according to which all information is stored in a crystal-phase remnant with size and mass much above the Planck scale.

Sep 9, 2020

US20060071122A1 — Full body teleportation system

Posted by in categories: cosmology, physics

A pulsed gravitational wave wormhole system that teleports a human being through hyperspace from one location to another.

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