quantum fluctuations in a vacuum

[p764rds]

Some physicists are giving up on physical particles and talking about quantum fluctuations in a vacuum.
So, what exactly is a quantum fluctuation in a vacuum?

[Abhijeet1]

Actually in the vacuum where exists no matter hence no energy there we tend to find energy. How that's possible?
It comes from the uncertainty principle of Heisenberg.
Where particle-antiparticle couple come in and out of existence and cause fluctuations in the vacuum. They stay for a very brief account of time and thus give rise to the virtual particle concept .