Dark energy may not actually exist

London, August 18 (ANI): A new research by scientists has claimed that dark energy – the mysterious substance thought to make up three-quarters of the universe – may not actually exist.

The concept of dark energy was created by cosmologists to fit Albert Einstein’s General Theory of Relativity into reality after modern space telescopes discovered that the Universe was not behaving as it should.

According to Einstein’s work, the speed at which the Universe is expanding following the Big Bang should be slower than it actually is and this unexplained anomaly threatened to turn the whole theory upside down.

In order to reconcile this problem, the concept of dark energy was invented.

But now, according to a report in the Telegraph, Blake Temple and Joel Smoller, mathematicians at the University of California and the University of Michigan, believe they have come up with a whole new set of calculations that allow for all the sums to add up without the need for this controversial substance.

The research could change the way astronomers view the composition of our Universe, as it may prove that dark energy doesn’t exist at all.

The Standard Model of Cosmology, which describes the evolution of the Universe, begins with the Big Bang.

Astronomers have recently observed that the galaxies are accelerating as they move away from each other, and cosmologists have sought to explain this unexpected acceleration by introducing the concept of dark energy, which permeates space, propels matter, and accounts for nearly 75 percent of the mass-energy in our Universe.

The new research is likely to be equally controversial as the work it purports to challenge especially as it relies on our galaxy being at the centre of the Universe – a concept that has been generally disregarded in modern science.

According to Dr Malcom Fairbairn, particle cosmologist at King’s College London, “Ever since the concept of dark energy was first mentioned, people have been trying to explain it or explain it away. It is a mystery and an inconvenience.”

“This is one attempt at it. Whether it is right only time will tell,” he said. (ANI)

Spacecrafts may soon travel faster than light at ‘Star Trek’ warp speed

Washington, May 9 (ANI): Two physicists at Baylor University, US, have an idea that can turn traveling at the speed of light from science fiction to real science, just like the warp speed at which spacecraft travel in the fictional TV and film series ‘Star Trek’.

Dr. Gerald Cleaver, associate professor of physics at Baylor, and Dr. Richard Obousy, a Baylor post-doctoral student, theorize that by manipulating the space-time dimensions around the spaceship with a massive amount of energy, it would create a “bubble” that could push the ship faster than the speed of light.

To create this bubble, the Baylor physicists believe manipulating the 11-dimension would create dark energy.

Cleaver said that positive dark energy is responsible for speeding up the universe as time moves on, just like it did after the Big Bang, when the universe expanded faster than the speed of light.

“Think of it like a surfer riding a wave,” said Cleaver, who co-authored a research paper with Obousy about the new method.

“The ship would be pushed by the bubble and the bubble would be traveling faster than the speed of light,” he added.

The method is based on the Alcubierre drive, which proposes expanding the fabric of space behind a ship into a bubble and shrinking space-time in front of the ship.

The ship would not actually move, rather the ship would sit in between the expanding and shrinking space-time dimensions.

Since space would move around the ship, the theory does not violate Einstein’s Theory of Relativity, which states that it would take an infinite amount of energy to accelerate an object faster than the speed of light.

String theory suggests the universe is made up of multiple dimensions. Height, width and length are three dimensions, and time is the fourth dimension.

Scientists believe that there are a total of 10 dimensions, with six other dimensions that we cannot yet identify.

A new theory, called M-theory, takes string theory one step farther and states that the “strings” actually vibrate in an 11-dimensional space.

It is this 11th dimension that the Baylor researchers believe could help propel a ship faster than the speed of light. (ANI)

“Noise” from space may help reveal mass of near-Earth asteroids

Washington, April 4 (ANI): Planetary scientists are all set to turn “noise” from the data obtained by NASA/ESA LISA satellites’ mission into useful information about the mass of near-Earth asteroids.

LISA is on a mission to detect gravitational waves – a warping of the space/time continuum that scientists hope to see directly for the first time.

Slated for launch no earlier than 2018, LISA will include three satellites connected by laser beams. The distance between the satellites should change as a gravitational wave passes.

Einstein’s General Theory of Relativity predicts that gravitational waves from exploding stars or colliding black holes ripple across the universe, causing other bodies to wobble like driftwood in a motorboat’s wake.

In 2006, planetary scientists realized that Near Earth Asteroids (NEAs) also would make the spacecraft wobble as they passed nearby, creating a distinct signature in the data being collected.

Pasquale Tricarico, a scientist at the Tucson-based Planetary Science Institute, expanded on that work to predict the number of asteroid encounters LISA can expect and how those encounters can be used to determine the mass of passing asteroids.

According to Tricarico, LISA can expect to see one or two known near-Earth asteroids a year, and a total of around ten during the expected mission lifetime.

When an encounter with a known asteroid shows up in the data, scientists will already know its trajectory.

“So from the signal, we can indirectly measure the asteroid’s mass because that’s the only uncertainty in the equation,” Tricarico said.

“These mass measurements are important because we only know the mass of asteroids that have been visited by spacecraft or the mass of a few binary asteroids observed from Earth,” he added.

“We always wonder about the porosity, the density, and this will give us measurements from additional asteroids,” he explained.

If a known asteroid passes one of the satellites and doesn’t leave a signature, “that allows us to put an upper limit on the mass of that asteroid,” Tricarico added.

Tricarico also has predicted the number of potential encounters with smaller, unknown NEAs.

If LISA starts detecting five asteroids a year instead of two or three, this could modify theories concerning the distribution of sizes in the NEA population. (ANI)