Is there high reason to believe that there exist particles in our dimensional universe that are not detectable

Question

For example a black hole is only detectable because it releases radiation that we can detect as well as the implied effect it has on other objects (planets, universes etc....). Is there reason to believe spatial anomalies or particles exist that we don't have current technology to detect.

Answer 1

Neutrinos

Answer 2

That can be the case. We can only detect (make) particles that have a rest mass that is less than the highest energy we can create in our accelerators unless they are stable particles that make up normal matter. We are on the borderline of detecting or not detecting what's called the Higgs boson (lets particles have mass) and there are some very high mass particles proposed by a theory called super symmetry that we cannot investigate because of measurement limitations. The spatial anomoly thought is probably a bit of a reach.

Answer 3

In a way it depends on what you mean by the terms in your question. If a particle has no interactions with anything, meaning its presence could never be detected, then it would never influence anything in the universe and the universe would never know it existed. Could it be said to be in our universe at all?

More prosaically, it is possible that it is technologically impossible to detect a particle that does interact with the universe because the construction of a detector is impractical or unfeasible. Right now, the gravitational wave detectors around the world haven't had much luck detecting anything, I believe, so the graviton in a way is a particle we believe to exist but which we can't detect.

Answer 4

There probably are particles that we cannot detect.
The neutrino was pretty tough to detect.
Some entity may exist in abundance and lack a single dimension that would hide it from are present technology.
Some characteristics of a neutrino may parallel this situation to a degree!

Answer 5

We may not have technology to detect everything in the universe yet, but with better technology everything should be detectable. For example we did not have any ability to detect X-rays, radio waves, electrons or alpha radiation as recently as 200 years ago, but we can now. There may be something else out there we can't yet detect, but we will some day.

Answer 6

Dark matter has been proposed by astronomers to explain the accelerating expansion of the universe. They estimate this constitutes the vast majority of matter in the universe, but it is so far undetectable. Not sure I buy this... I am more of the opinion dark matter is a fudge factor they throw in so their algorithms work out correctly.