The existence of other universes with different physical laws is still a topic of active speculation and scientific inquiry. While it has not been conclusively proven or disproven, there are several theoretical frameworks and cosmological models that suggest the possibility of multiple universes or a multiverse.
One such framework is known as the inflationary multiverse theory, which proposes that our universe is just one of many "bubbles" that emerged during a period of rapid expansion in the early universe. Each bubble could have different physical laws and constants. Another concept is the string theory landscape, which suggests that there are a vast number of possible configurations of fundamental particles and forces, resulting in different universes with distinct physical properties.
However, it is important to note that these ideas are still highly speculative and largely theoretical. The lack of empirical evidence or direct observation of other universes makes it challenging to definitively confirm or rule out their existence. Furthermore, our current understanding of physics is primarily based on observations within our own universe, so investigating other universes with different physical laws is inherently difficult.
Regarding your mention of quantum mechanics, it is worth noting that quantum mechanics itself introduces a level of uncertainty and probabilistic behavior at the fundamental level. Some interpretations of quantum mechanics, such as the many-worlds interpretation, suggest the existence of multiple parallel universes branching off from every quantum event. However, these interpretations are still a matter of debate among physicists.
In summary, while the existence of other universes with different physical laws is an intriguing idea and an active area of research, it remains an open question without definitive proof or consensus within the scientific community.