Monday, 2 August 2010 Stuart Gary
A new theory has been put forward to explain the accelerating expansion of the universe, without the need for dark energy.
The new cosmology developed by Wun-Yi Shu of the National Tsing Hua University in Taiwan also paints a picture of a universe with no beginning and no end.
His paper, which appears on the pre-press website ArXiv.org, describes a universe where time and space are not independent, but can be converted back and forth between each other. It also proposes that the speed of light is simply a conversion factor between the two.
Shu also describes both mass and length as interchangeable with the conversion factor being dependant on the speed of light and the gravitational constant, neither of which actually need to be constant.
Shu’s universe has no singularities so there can be no beginning or end, just alternating periods of expansion and contraction.
Shu’s cosmology predicts that during periods of expansion, an observer in this universe would see an odd kind of change in the red-shift of bright objects such as Type-1A supernovae, as they accelerate away.
And according to Shu, this exactly matches real observations by astronomers.
This kind of acceleration is an ordinary feature of Shu’s universe, but is in stark contrast to the various models of the universe based on the Big Bang theory.
Since discovering that the universe is undergoing accelerated expansion, cosmologists have found it hard to explain their observations using modifications to the laws of physics such as the force of dark energy.
For this model to work, dark energy must make up 75% of the total energy-mass of the Universe.
But Shu says there is a serious price to pay for this idea: The law of conservation of energy. In other words the total amount of energy in an isolated system remains constant over time meaning it can’t be created nor destroyed, only changed from one state to another.
Shu believes there’s no need to abandon conservation of energy to make his theory work………………………..