The Chameleon –“Dark Energy is Hiding”

Chameleon Theory of Gravity

 

Justin Khoury,  physicist at the University of Pennsylvania, has proposed one possible reason why dark energy particles have yet to be detected: “they’re hiding from us.”

(more…)

“The Bubble Universe” –A New Model of the Cosmos

 

Bubble Universe

 

As Peter Woit, a theoretical mathematician at Columbia University says, string theory “is not even wrong” because it is not falsifiable –a basic tenet of all science theory. Now, Uppsala University researchers have devised yet another “new model” for the universe based on string theory – one with the added bonus they propose may solve the enigma of dark energy.

(more…)

“Astonishing New Theory” –‘Dark Matter & Dark Energy Are a Fluid’

A simulation of the dark matter distribution in the universe 13.6 billion years ago.

 

“We now think that both dark matter and dark energy can be unified into a fluid which possesses a type of ‘negative gravity’, repelling all other material around them,” says Jamie Farnes from the Oxford University e-Research Center. “The outcome seems rather beautiful: dark energy and dark matter can be unified into a single substance, with both effects being simply explainable as positive mass matter surfing on a sea of negative masses.”

(more…)

“Dark Energy’s Known Unknown” — Could It Be the Symmetron Field That Pervades Space Much Like the Higgs Field

 

One thing is certain: there’s something out there we don’t yet know. For years now scientists have been looking for “dark matter” or “dark energy” – with our current inventory of particles and forces in nature we just can’t explain major cosmological phenomena, such as why the universe is expanding at an ever faster rate.

New theories for “dark energy” have been suggested. One of the candidates is the so-called “symmetron field”, which is said to pervade space much like the Higgs field. At the TU Vienna researchers have developed an experiment capable of measuring extremely small forces with the help of neutrons. The measurements were taken during a 100-day campaign at the Institut Laue-Langevin, on its PF2 ultra-cold neutron source. They could have provided pointers to the mysterious symmetrons – but the particles didn’t show up. Although this is not the end of the theory, it does at least exclude the possibility of symmetrons existing across a broad range of parameters – and “dark energy” is going to have to be explained differently.

(more…)

Search for ‘Planet X’ Reveals 12 New Moons of Jupiter –“Including One Weirdo”

“Jupiter just happened to be in the sky near the search fields where we were looking for extremely distant Solar System objects, so we were serendipitously able to look for new moons around Jupiter while at the same time looking for planets at the fringes of our Solar System,” said Carnegie Institute’s Scott S. Sheppard.

Twelve new moons orbiting Jupiter have been found–11 “normal” outer moons, and one that they’re calling an “oddball.” This brings Jupiter’s total number of known moons to a whopping 79–the most of any planet in our Solar System. A team led by the Carnegie Institute first spotted the moons in the spring of 2017 while they were looking for very distant Solar System objects as part of the hunt for a possible massive planet far beyond Pluto.

(more…)

“SuperGalaxy” –Will the Human or Alien Species Transform the Milky Way to Survive in an Ever-Expanding Universe?

“A hyper-advanced civilization might raid other galaxies for stars to keep the Milky Way glowing for trillions of years. Over a period of billions of years our progeny could secure many trillions of stars that would have otherwise fallen victim to the expansion of space, beyond our reach forever. These stars could ultimately become gravitationally bound to the future version of the Milky Way, leading over time to the formation of an enormous supergalaxy.”

It might not seem like it, but the inhabitants of Earth are on the threshold of leaving the solar system continues Dan Hooper, author of Dark Cosmos in today’s Scientific American. On cosmic timescales—measured in millions or even billions of years—it will be no time at all before our descendants begin to spread outward and across the Milky Way Galaxy. Unless technological progress is brought to a halt by some kind of major catastrophe, the era of our Earthly confinement is about to come to a close.

Imagine that over the course of the next hundred million years or so a hyperadvanced civilization emerges from Earth—much as our early ancestors once migrated out of Africa—and expands across the entirety of the Milky Way. Futurists have long argued such beings will build structures called Dyson spheres around stars, capturing and putting to use as much of the energy released in starlight as possible. It seems entirely conceivable that 100 million years from now every star in the Milky Way will be surrounded by a Dyson sphere, providing roughly a trillion trillion, or 1024 times more power than human beings currently produce and consume.

I don’t claim to have any great insights into what this kind of civilization will chose to use their vast quantities of energy to accomplish. Maybe they’ll use it to tackle unsolved math problems or to create and maintain vast simulations of virtual worlds. Perhaps they will direct it to the expansion of their civilization or to the creation of art or other such pursuits. Regardless of their goals, however, one thing is clear. Every act, including thinking, requires energy. This means no matter what an advanced civilization may want to accomplish, harnessing the power of as many stars as possible will help them to do it.

To such a civilization, the greatest long-term threat will be the expansion of space. The stars, planets and other forms of matter that make up our galaxy are bound together by the force of gravity, and thus we don’t easily notice the effects of this expansion. But across much larger distances the expansion of space is steadily pulling galaxies apart from one another, riding on the very fabric of spacetime. Exacerbating this further is the fact our universe is not only expanding but is doing so at an accelerating rate, being driven by what cosmologists call “dark energy.”

Continue reading…