Note, keep in mind these are my own thoughts here. I’m not quoting from any scientific studies or anything. Though I do have a pretty good grasp of physics (at least, I think I do), some (or all) of this may not be entirely accurate. My understanding of physics and energy may be flawed, though to the best of my knowledge and understanding, this is all accurate.
I’m sure we’ve all seen the ghost hunting shows or been in the forums where they throw out ideas about a mysterious “energy” that they might be made of. And we’ve seen the science fiction shows where some being evolves beyond the need for a body. While that may be possible in alternate universes and different dimensions, in our universe physics makes that completely impossible.
First, a note on “energy”. Energy isn’t some big mystery as people tend to think it is. There are essentially 2 types of energy. There is physical energy, matter in motion, and there is electromagnetic energy, essentially fields. Using matter, you can convert between the two. You can turn the crank on a generator, putting the electromagnetic fields of magnets in motion, acting on electrons to get them moving, send those electrons to an incandescent light bulb which is converted back into electromagnetic energy in the light and heat radiated. While many things exhibit traits of being both matter and an electromagnetic wave (see “double slit test” for photons and electrons), for the purpose of this discussion light and radio waves are electromagnetic energy while all other forms of energy are physical energy, explained below.
Physical energy must have a physical component made of matter while electromagnetic energy exists independently of matter. There is one very significant aspect of these two things which definitively differentiates them and that is speed. The speed at which electromagnetic energy travels is always the speed of light while the speed of the processes involved in physical energy is always less than the speed of light. For physical energy that speed can be zero, making it “potential energy”. No potential energy is possible for electromagnetic energy as it is always traveling at the speed of light.
So with this knowledge it becomes impossible for an energy based entity to exist in our universe. Electromagnetic energy always travels in a straight line at the speed of light. The entity not only could not “sit still” and interact with us, its various energy components could not interact with each other. Since they’re all traveling in the same direction at the same speed there could be no cross interaction allowing for thought or reaction. Also, no time would pass for such an entity since it is moving at the speed of light. This means that an entity would require matter and physical energy, what we refer to as a “body”, the exact opposite of a spirit. To illustrate this point, imagine shining a blue beam of light through a red beam of light. If you put a piece of paper at the intersection you get purple light. But if you put your paper past the intersection you get red light at one point and blue light at the other point. No interaction between the two beams happens without matter causing an interaction.
What’s more, this understanding does not allow for the existence of a soul even contained within our bodies, even while we are alive. Remember, the electromagnetic energy always travels in a straight line at the speed of light, though it can be converted back and forth to and from physical energy. This means that no changes in the electromagnetic energy within us (there is some) is possible without interaction with the matter of the body. The electromagnetic energy on its own cannot “do” or “think” or “be” anything. It is our physical bodies which direct the processes of thought, mostly using chemical energy, physical energy produced out of chemical reactions. While the electromagnetic energy within us, produced by those chemical reactions, can, in turn, affect other chemical reactions within us and may be an integral part of “us”, on it’s own this electromagnetic energy is useless, unable to interact with itself. Matter is absolutely required for interactions between electromagnetic energies.
The conclusion we must draw is that there is no mysterious “energy” which could account for spirits, nor is there enough mystery about the nature of energy to allow for such an as yet undiscovered form of energy to exist. Instead the word is used like the word “toxins” in holistic quackery. It is a completely undefined term used to make the claim sound smarter than it is by hiding the fact that the claimant has no idea what this “energy” or these “toxins” might be.