A chameleon-like power that adjustments its nature with its setting might clarify a significant physics quandary: how a mysterious substance known as darkish power is inflicting the cosmos to broaden sooner and sooner. However a brand new experiment casts doubt on some chameleon theories, researchers report Aug. Physics of nature.
The chameleon power would be the fifth kind of power along with the principle 4: gravitational, sturdy, weak and electromagnetic. And like a chameleon altering its shade, the hypothetical fifth power will remodel relying on the density of the setting. In dense environments such because the Earth, this fifth power will likely be weak, masking its results. In rarefied area, the power will likely be stronger and longer-ranged.
This power would be the results of a chameleon discipline, an addition to recognized fields in physics comparable to electrical, magnetic, and gravitational fields. A chameleon discipline with such transformative properties might management the accelerating enlargement of the universe with out diverging from measurements on Earth.
However it’s a problem to seek out out such a altering energy. On Earth, says astrophysicist Jianhua He of Nanjing College in China, “it is vitally, very small. That is the toughest half.”
So He and his colleagues developed a detector to search for the delicate fifth power. A wheel with a plastic movie connected spins previous one other movie sitting on a magnetically levitating piece of graphite. If the chameleon power does exist, the spinning movies will trigger a periodic power on the levitating plastic, pulling it up and down. (Gravity works the identical approach, however as a result of design of the gadget, it needs to be a lot weaker than the power of a chameleon.)
The workforce was in a position to eradicate the class of chameleon theories. Sooner or later, the researchers hope to enhance their outcomes by cooling their gadget to supply extra correct measurements.