When you move your finger, the motion involves the interplay of quantum fields and particles. In the framework of quantum field theory, particles are viewed as excitations or disturbances of their corresponding quantum fields. So, let's consider the example of your finger moving and explore what happens at the particle and field levels.
At a fundamental level, your finger is composed of atoms, and those atoms consist of a nucleus surrounded by electrons. These electrons are described by quantum fields known as electron fields. When you move your finger, the motion of the electrons in the atoms is a complex quantum mechanical process.
As you move your finger, the existing particles, such as electrons, in your finger do not change their fundamental nature or transform into new particles. Instead, their quantum fields undergo excitations or changes in their quantum state. These excitations propagate through the field like waves, carrying the information about the finger's movement.
The excitations of the quantum fields can be visualized as waves or disturbances propagating through space and time. This wave-like behavior is a fundamental aspect of quantum mechanics. The movement of your finger involves a chain reaction of excitations propagating through the electron fields, which then interacts with other quantum fields, such as electromagnetic fields.
It's important to note that this description is a simplified explanation of a complex phenomenon. The reality is that the interactions and dynamics involved in finger movement are incredibly intricate, involving a multitude of particles and their associated fields. Nonetheless, at a fundamental level, the motion of your finger can be understood as the propagation of excitations through the quantum fields associated with the particles that make up your finger.