Originally Posted by **pittsburghjoe** how is a dimension the goes inward different than being one that is negative? |

A negative dimension would reduce the dimension of space-time to 3. Either this is going to be a 2+1 Lorentz space-time, which has very different properites than 3+1 space-time and we have never seen those properties by experiment, or to a 3D Euclidean space "time" where the time component is missing, and we know that a time dimension exists. Again by experiment.

Once more: There is no process that can be seen as a "negative" dimension!

Originally Posted by **pittsburghjoe** Is gravity the negative dimension we have been talking about? Is there something preventing gravity being more than just a force? It blows my mind that we haven't tried the double slit experiment on the international space station. |

Perhaps it should be done but consider: computers are built and work by QM. If the double slit experiment didn't work up there then neither would the computers.

-Dan