We address four physics opportunities. First, suggest new elementary particles and forces. Second, explain phenomena such as dark matter. Third, augment and unite physics theories and models. Fourth, point to opportunities for further research. We use models based on solutions to equations featuring isotropic pairs of isotropic quantum harmonic oscillators. First, we show solutions that match the known elementary particles. We propose that other solutions correlate with elementary particles that people have yet to detect and with dark energy forces leading to three known eras - early acceleration, subsequent deceleration, and current acceleration - pertaining to the rate of expansion of the universe. Second, we extend solutions to encompass known conservation-law symmetries. Extended solutions correlate with known kinematics. We suggest that extended solutions describe dark matter, explain ratios of density of dark matter to density of ordinary matter, correlate with dark energy density, and explain other phenomena. Third, we propose that our work unites, suggests details regarding, extends, suggests complements to, and suggests limits regarding aspects of traditional physics theory. Those aspects include classical physics, special relativity, general relativity, quantum mechanics, the elementary particle Standard Model, the cosmology timeline, and galaxy evolution scenarios. The work provides possible insight regarding foundation of physics topics. Fourth, we suggest opportunities for people. We suggest opportunities for observational, experimental, and theoretical physics research. We suggest quantum field theory that features few interaction vertices, sums of few terms as alternatives to conditionally convergent sums of infinite numbers of terms, and no needs to deal with some infinities. We point to possible opportunities to further develop and apply modeling and math we use.