The behavior of antiparticles and their relationship to gravity can vary depending on the specific universe or theoretical framework being considered. In our current understanding of physics, antiparticles behave similarly to their corresponding particles in terms of gravitational interactions. Both particles and antiparticles are subject to gravity and contribute to the overall gravitational field.
In the Standard Model of particle physics, which describes the known particles and their interactions, antiparticles are typically described as having opposite charge and quantum numbers compared to their corresponding particles, but they still have positive mass and positive energy. This means that they would contribute to the attractive gravitational force, just like normal matter.
However, it's worth noting that there are various speculative theories and hypothetical scenarios in physics that explore different possibilities. For instance, in certain extensions of the Standard Model or in theories of quantum gravity, there might be exotic particles or states of matter that exhibit different gravitational behaviors. These are highly speculative and often not well-established or supported by experimental evidence.
Regarding the creation of new particles and universes, the concept of particle creation and universe formation is an area of active research and speculation in theoretical physics. Some theories propose that new universes could emerge through processes involving particles and their interactions, such as in certain models of cosmology and quantum gravity. However, the details of how this occurs and the precise role of antiparticles in such scenarios are still subjects of investigation and debate.
It's important to keep in mind that our understanding of the universe is continually evolving, and there are still many open questions and mysteries to be explored. Future discoveries and advancements in physics may provide new insights into the behavior of particles, antiparticles, and the fundamental nature of gravity.