Question

Suppose the earth began to shrink without any change in its mass, will there be any change in the value of acceleration due to gravity.

Answer 1

Zero-point energy (ZPE) or ground state energy is the lowest possible energy that a quantum mechanical system may have. Unlike in classical mechanics, quantum systems constantly fluctuate in their lowest energy state due to the Heisenberg uncertainty principle. As well as atoms and molecules, the empty space of the vacuum has these properties. According to quantum field theory the universe can be thought of not as isolated particles but continuous fluctuating fields: matter fields, whose quantaare fermions (i.e. leptons and quarks), and force fields, whose quanta are bosons (e.g. photons and gluons). All these fields have zero-point energy. These fluctuating zero-point fields lead to a kind of reintroduction of an aether in physics, since some systems can detect the existence of this energy. However this aether cannot be thought of as a physical medium if it is to be Lorentz invariantsuch that there is no contradiction with Einstein's theory of special relativity.