A Brief Crossword

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Across
  1. 4. The four-dimensional space whose points are events.
  2. 5. subatomic particles that carry a fractional electric charge,building blocks of the hadrons.
  3. 6. For a wave, the distance between two adjacent troughs or two adjacent crests.
  4. 8. The theory developed from Planck’s quantum principle and Heisenberg’s uncertainty principle.
  5. 9. A point in space-time, specified by its time and place.
  6. 10. A point in space-time at which the space-time curvature becomes infinite.
Down
  1. 1. The singularity of energy at the beginning of the universe.
  2. 2. A region of space-time from which nothing, not even light, can escape, because gravity is so strong.
  3. 3. A thin tube of space-time connecting distant regions of the universe.
  4. 4. A theory of physics in which particles are described as waves on strings. Strings have length but no other dimension.
  5. 7. The study of the universe as a whole.
  6. 8. The indivisible unit in which waves may be emitted or absorbed
  7. 10. The component frequencies that make up a wave.