  We investigate non-gravitational signals of dark energy within the framework
of gauge symmetry in the dark energy sector. Traditionally, dark energy has
been primarily studied through gravitational effects within general relativity
or its extensions. On the other hand, the gauge principles have played a
central role in the standard model sector and dark matter sector. If the dark
energy field operates under a gauge symmetry, it introduces the possibility of
studying all major components of the present universe under the same gauge
principle. This approach marks a significant shift from conventional
methodologies, offering a new avenue to explore dark energy.
