The concept of parallel universes is primarily a speculative idea in physics and cosmology. It suggests the existence of other universes that may have different physical laws, dimensions, or initial conditions compared to our own universe. However, the existence and nature of parallel universes are still topics of scientific debate, and there is no conclusive empirical evidence to support their existence at this time.
When you mention having an entire parallel universe "inside us," it's important to clarify that this idea generally falls into the realm of metaphor or metaphorical thinking. It can be seen as a metaphorical representation of the complexity and vastness of the human mind and consciousness.
The human mind is incredibly intricate and capable of generating a wide range of thoughts, perceptions, emotions, and experiences. Within our own minds, we can create and explore various mental landscapes, perspectives, and possibilities. This richness of inner experience can sometimes be metaphorically likened to a universe within ourselves.
However, it's crucial to distinguish between metaphorical or symbolic interpretations and the scientific concept of parallel universes. The notion of an entire parallel universe existing inside an individual is not a scientific concept but rather a metaphorical way of expressing the complexity of human consciousness and experience.