In physics, the term "coherence" is used to describe the property of waves that are in phase with each other. It refers to the degree of correlation between the phases of different wave oscillations.
In the context of the double-slit experiment, when unobserved waves pass through the two slits and interfere with each other, they can exhibit a phenomenon known as interference fringes. This interference pattern occurs when the waves are coherent, meaning they maintain a consistent phase relationship. The fringes arise from constructive and destructive interference between the waves, resulting in regions of enhanced or diminished intensity.
However, coherence itself does not necessarily imply the absence of spacetime. Coherence is a property of wave behavior and is applicable to various physical phenomena, including those that occur within the framework of spacetime. It describes the behavior of waves, their superposition, and the resulting interference patterns.
If you are referring to a hypothetical concept that doesn't involve spacetime at all, it would go beyond the conventional framework of modern physics. Speculating on such concepts typically lies in the realm of speculative or theoretical physics, where new models or theories might be proposed to explore phenomena beyond our current understanding. However, it is important to note that without concrete scientific theories or evidence, it is challenging to provide specific nomenclature for a completely different framework that doesn't utilize spacetime.