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Category: cosmology – Page 148

About Quintessence: the time-evolving form of energy which drives the expansion of the universe

In this weeks continuation article of Dark Energy and what it is, we will be looking at Quintessence: which could be what dark matter is made of.

Quintessence. It is a “time-evolving and spatially dependent form of energy with negative pressure sufficient to drive the accelerating expansion” (Cladwell R.R. and Steinhardt P.J., 2000a, para 41).

Since it has negative pressure, it also has negative gravity. This negative gravity could explain the expansion of the universe. There are many models to describe quintessence, the simplest being, the fact that quintessence might be a quantum field with very long wavelength stretching across the universe. Negative gravity arises in this field by the negative pressure, and we can calculate the pressure by subtracting the Kinetic and Potential energies of the rate of oscillations in the field strength. This model is also successful, because it explains how the density of Dark Energy, or quintessence, changed over time, and fits in with the idea that dark energy must have been insignificant during the early universe to allow the large scale structures to form.

NASA’s NEOWISE Unveils Hidden Universe of Near-Earth Objects

As the infrared space telescope continues its long-duration survey of the universe, it is creating a unique resource for future astronomers to make new discoveries.

NASA ’s NEOWISE mission has released its 10th year of infrared data – the latest in a unique long-duration (or “time-domain”) survey that captures how celestial objects change over long periods. Time-domain astronomy can help scientists see how distant variable stars change in brightness and observe faraway black holes flaring as they consume matter. But NEOWISE has a special focus on our planet’s local cosmic neighborhood, producing a time-domain infrared survey used for planetary science, with a particular emphasis on asteroids and comets.

Short for Near-Earth Object Wide-field Infrared Survey Explorer, NEOWISE is a key component of NASA’s planetary defense strategy, helping the agency refine the orbits of asteroids and comets while also estimating their size. One such example is the potentially hazardous asteroid Apophis, which will make a close approach of our planet in 2029.

Real-life multiverse could exist and be ‘infinitely bigger’ than ever imagined, scientists discover

A NEW study of quantum mechanics has argued that a real-life multiverse could be much bigger than ever previously imagined.

Just like the fictional multiverse depicted in sci-fi movies and the Marvel superhero universe, we too could be living in a world where multiple realities are possible.

That’s according to a study published on the academic site Arxiv.

‘Dark Stars’: Dark Matter may Form Exploding Stars, and Observing the Damage could help Reveal what it’s Made of

Dark matter is a ghostly substance that astronomers have failed to detect for decades, yet which we know has an enormous influence on normal matter in the universe, such as stars and galaxies. Through the massive gravitational pull it exerts on galaxies, it spins them up, gives them an extra push along their orbits, or even rips them apart.

Like a cosmic carnival mirror, it also bends the light from distant objects to create distorted or multiple images, a process which is called gravitational lensing.

And recent research suggests it may create even more drama than this, by producing stars that explode.

5,000 Tiny Robots Unveil Secrets Of Universe’s Dark Energy

In a revolutionary scientific endeavor, researchers are using 5,000 miniature robots perched atop a mountaintop telescope to peer an astonishing 11 billion years into the past. This cutting-edge instrument, known as the Dark Energy Spectroscopic Instrument (DESI), is capturing light from distant objects in space, allowing scientists from the Lawrence Berkeley National Laboratory to map our cosmos as it was in its infancy and trace its evolution to the present day.

Why is this so important? Understanding how our universe has evolved is intrinsically linked to predicting its ultimate fate and unraveling one of the biggest mysteries in physics: dark energy. This enigmatic force is causing our universe to expand at an ever-increasing rate, and DESI is providing us with unprecedented insights into its effects over the past 11 billion years.

DESI has created the largest and most precise 3D map of our cosmos ever constructed, enabling scientists to measure the expansion history of the young universe with a precision better than 1 percent for the first time. This unparalleled view of the universe’s evolution is shedding light on the interplay between matter, dark matter, and dark energy in shaping the cosmos.

Black Hole Effects on Quantum Information Discovered in Everyday Chemistry

Nothing makes a mess of quantum physics quite like those space-warping, matter-gulping abominations known as black holes. If you want to turn Schrodinger’s eggs into an information omelet, just find an event horizon and let ‘em drop.

According to theoretical physicists and chemists from Rice University and the University of Illinois Urbana-Champaign in the US, basic chemistry is capable of scrambling quantum information almost as effectively.

The team used a mathematical tool developed more than half a century ago to bridge a gap between known semiclassical physics and quantum effects in superconductivity. They found the delicate quantum states of reacting particles become scrambled with surprising speed and efficiency that comes close to matching the might of a black hole.

New highly-detailed 3D map of universe with 6 million galaxies can unravel mysteries of dark matter

A highly detailed three-dimensional map of six million galaxies was recently unveiled by a group of scientists. The map is believed to have the potential to unravel some hidden secrets of dark matter and the future of our universe.

The map was created with the help of data collected by the Dark Energy Spectroscopic Instrument (DESI) in Arizona. The first-of-its-kind map has scaled some galaxies for the first time that were never recorded earlier for the study of the universe.

DESI is an instrument that can capture light from 5,000 galaxies many million light years away from Earth. It becomes the backbone of research in the development of the biggest 3D map of galaxies that could alter the way we think about dark matter and the universe.

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