The Aspen project was started in 2016 and is based on a hypothesis formed the year prior. This hypothesis relates to the quantum state of the vacuum and dark energy. Dark energy is an antigravitational effect that exists when the vacuum pressure of space becomes negative. In the cosmos, dark energy is an area in space with a higher density of quantum field fluctuations. Quantum fields are electromagnetic in nature and thus can be manipulated by external electromagnetic fields.
Negative pressures can be created by increasing the electromagnetic stress gradients at a particular point in space. Our Aspen (Antigravitational Space Propulsion ENgine) is capable of doing just that.