The nature of quantum fields is a subject of interpretation and understanding within the framework of quantum field theory (QFT). It is important to note that quantum fields themselves are not directly observable entities like particles; rather, they are mathematical constructs used to describe the behavior and interactions of particles.
In QFT, particles are often described as excitations or disturbances in their corresponding fields. These disturbances can be interpreted as virtual particles, which are not directly detectable and do not necessarily correspond to physical particles that exist as individual entities.
Regarding the question of whether quantum fields can be considered as "real materialistic substances," there are different viewpoints and interpretations among physicists. One interpretation is that quantum fields represent fundamental entities in nature, existing throughout spacetime, and responsible for the creation and interaction of particles. In this view, quantum fields are considered as real and tangible as any other physical entity.
However, it is worth noting that the nature of reality at the most fundamental level is still a topic of ongoing scientific investigation and philosophical debate. Different interpretations, such as instrumentalism or ontological realism, exist regarding the ontological status of quantum fields and the nature of reality they represent. These interpretations often reflect differing philosophical stances and have implications for how one understands the fundamental nature of the universe.
Ultimately, the interpretation of quantum fields as "real materialistic substances" is a matter of perspective and depends on the philosophical and theoretical framework one adopts. It is important to recognize that the nature of quantum fields and their ontological status is an active area of research and subject to ongoing exploration and debate.