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I propose a novel (interpretation of) quantum theory, which I will call
Environmental Determinacy-based or EnD Quantum Theory (EnDQT). In contrast to
the well-known interpretations of quantum theory, EnDQT doesn't modify its
equations or add hidden variables, is not in tension with relativity, and
provides a local causal explanation of Bell-type correlations without
measurement outcomes varying according to perspectives or worlds. Unlike
collapse theories, in principle, arbitrary systems can be placed in a
superposition for an arbitrary amount of time, and no modifications of the
equations of quantum theory are required. Furthermore, it provides a series of
novel empirical posits that may distinguish it from other interpretations of
quantum theory. According to EnDQT, some systems acquire determinate values at
some point, and the capacity to give rise to determinate values through
interactions propagates to other systems in spacetime via local interactions.
This process can be represented via certain networks. When there is isolation
from the rest of the systems that belong to these networks, such as inside the
friend's isolated lab in the extended Wigner's friend scenarios, indeterminate
values non-relationally arise inside.
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