mass energy / high energy state / energy containing potential energy / low energy / energy level / relativistic total energy / dark energy / negative energy solution / potential energy / vacuum energy / low energy state / positive energy levels / positive energy level transitions / high energy / zero energy universe / negative energy level / lower energy state / negative energy levels / negative energy / energy value / vacuum energy value / positive and negative energy / positive energy / relativistic total energy formula / gravitational potential energy / energy / /