Gravity as a Quantum Entity

 


New research was published about gravity in the journal Physical Review Letters. A team from around the world is testing whether gravity behaves as a quantum entity when measured. Scientists hope the results will lead to the creation of a grand unified theory of physics. 

Physicists have learned a lot about the universe and its make up over the past century. One of  the biggest theories is Einstein's theory of classical relativity. It describes the visual or classical world. Quantum theory is the second biggest theory, describing the quantum world.

Gravity is the one thing physicists do not fully understand. It is uncertain if it fits into general relativity or quantum physics. Understanding what gravity truly is would tie the two fields together. This is one of the biggest goals in the physics community. 

The team have designed a tabletop experiment. It could be used to show whether gravity is changed when measured. This would be clear evidence that gravity is a quantum property. The experiment is somewhat simple. It uses one small diamond crystal. It is used as a device to measure gravitational pull from another equally sized diamond crystal. One of the diamond crystals is in a super position state. 

The team checked that the gravity of the second crystal affected the first crystal. The team then measured the first crystal again to see if its final state was different than its initial state. This would prove gravity was changed due to being measured. Therefore proving it is a quantum property. 

The testing continues!


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