The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For… Test | Final Test - Easy

Brian Greene
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This test consists of 15 multiple choice questions and 5 short answer questions.

Multiple Choice Questions

1. What shape allows for the vibrational patterns that we observe in our universe?
(a) The Kaluza-Klein shape.
(b) The six-dimensional torus.
(c) The Einstein matrix.
(d) The Calabi-Yau space.

2. When the universe is at its smallest possible size, which other property is also at its maximum?
(a) The cosmological constant.
(b) The string coupling constant.
(c) The Planck tension.
(d) Its temperature.

3. Which of the following is true regarding our current knowledge of the Calabi-Yau space?
(a) Its shape is totally unknown.
(b) Physicists and mathematicians disagree about its shape.
(c) Its shape is not fully known.
(d) Its shape is completely known and defined.

4. When a black hole's entropy increases, which of its characteristics increases as well?
(a) Its nuclear-weak force charge.
(b) Its electrical charge.
(c) The surface area of its event horizon.
(d) Its spin.

5. What did Stephen Hawking prove regarding black holes?
(a) Light cannot escape from them.
(b) They are the most massive objects in the universe.
(c) The emit radiation.
(d) They have electrical charge.

6. What property of both black holes and elementary particles is still unknown?
(a) Their supersymmetric partners.
(b) Their spin.
(c) Their relationships to strings.
(d) Their internal structures.

7. In what important way does string theory affect the cosmological model of the big bang?
(a) The big bang created strings, not particles.
(b) The universe started at a certain minimum size.
(c) The big bang could have created multiple universes.
(d) The universe is infinite, but has no boundaries.

8. Which of the following is true regarding experimental evidence for super particles?
(a) They have not been observed.
(b) They cannot be observed experimentally.
(c) They have been observed for a long time, and have only recently been identified.
(d) They have been observed in multiple experiments.

9. What is the importance of the string-coupling constant?
(a) If discovered, it could validate string theory as a whole.
(b) It is crucial in estimating the amount of dark energy in the universe.
(c) It could invalidate the perturbation method.
(d) It determines the energy released during a string's collapse.

10. Which of the following is true regarding the tearing of space-time according to string theory?
(a) It can tear under special circumstances.
(b) It cannot tear.
(c) It is not known if space-time can tear.
(d) A tear would destroy the universe.

11. What is strong-weak duality?
(a) A relationship between the strong and weak coupling constants in two different string theories.
(b) The relationship between bosonic-strong string theories and bosonic-weak theories.
(c) The coupling of strong and weak forces in M-theory.
(d) The union of the strong and weak forces at high energies.

12. Which team of researchers discovered the process for altering Calabi-Yau spaces by rupturing them?
(a) Bohr and Feynman.
(b) Yau and Tian.
(c) Greene and Morrison.
(d) Hawking and Fermi.

13. Who first proposed the existence of extra dimensions?
(a) Kaluza.
(b) Einstein.
(c) Maxwell.
(d) Hawking.

14. Which of the following is one of the difficulties in observing super particles?
(a) They do not interact with either matter or light.
(b) They are incredibly rare, and pass through most matter.
(c) They are too massive to be observed in a particle accelerator.
(d) They are massless.

15. By what factor is the minimum mass of a wrapped string in determined?
(a) The string's winding number.
(b) The string's Planck tension.
(c) The size of the circular dimension it is wrapped around.
(d) The vacuum energy of the dimension it is wrapped around.

Short Answer Questions

1. About how long after the big bang were stars formed?

2. What type of a string can be massless?

3. What is the collapse and reformation of a Calabi-Yau shape called?

4. About how long did the "primordial synthesis" stage of the big bang last?

5. What materials were formed during the period of the big bang known as the "primordial nucleosynthesis"?

(see the answer keys)

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