Yes, in a multiverse hypothesis, it is conceivable that our universe could be small compared to other universes within the multiverse. The concept of a multiverse suggests the existence of a vast ensemble of multiple universes, each potentially possessing different physical properties, laws, and configurations.
There are various multiverse theories proposed within the realm of theoretical physics, such as the inflationary multiverse, the string theory landscape, or the many-worlds interpretation of quantum mechanics. While the specifics and mechanisms differ, these theories generally propose that our universe is just one among many.
In some multiverse scenarios, it is suggested that universes can vary in size, shape, or dimensions. These variations could arise due to different physical conditions or properties in different regions of the multiverse. Therefore, it is conceivable that within such a multiverse, there could be universes that are much larger or smaller than ours in terms of spatial extent.
It's important to note that the concept of the multiverse is still speculative and remains an active area of scientific investigation. While these ideas provide fascinating possibilities and potential explanations for certain cosmological observations and fundamental questions, there is currently no direct empirical evidence to confirm or refute the existence of a multiverse. The study of the multiverse hypothesis involves theoretical models, mathematical frameworks, and philosophical considerations to explore the nature of our universe and its place within a larger ensemble of possible universes.