Are there additional dimensions?

Raj Kumar posted a question in Class XI-XII Tuition (PUC) Within a week Question: Are there additional dimensions? Answer: A human being can never perceive more than 3 dimensions. However, mathematical scheme of any dimensions is possible. examples: 1. 4 dimensional Minkowsky space which represents space and time behaviour (with time and space mutually influencing) covering the range of electrodynamics (its relativistic covariance between two inertial frames) and speed of light in vacuum as a relativistic invariant (the space is non-Euclidean as the metric is given by dS^2=(dx^2+dy^2+dz^2)-(c*dt)^2. 2. 4 dimensional Riemann space representing the gravity as a space-time property, in the presence of matter. Here the metric is more complicated. 3. Infinite dimensional Hilbert space having length of any vector unity. This space is used to represent all possible physical states in the limit of quantum mechanics which do not have classical analogues. read less