Question

What is the Big Bang? What are some of its properties?

Answer 1

Big Bang theory is an explanation for universe birth. It says that universe began with a singularity. Singularity is a point of infinite density and zero volume.After this Big Bang the universe inflated over the next 13.8 billion years to the cosmos that we know today. Some of properties of this theory is as follows-

1. Panck Era (From zero to 10^-43 s) - All four fundamental forces( gravity, weak nuclear, EM and strong nuclear) were unified and have same strength.

2. Grand Unification Era ( 10^-43 s to 10^-36 s)- Force of gravity separates from other three fundamental forces. Elementary particles and antiparticles began to create.

3. Electroweak Era (10^-36 s to 10^-12 s)- W and Z boson and Higg formation.

4. Quark Era (10^-12 s to 10^-6 s)

5. Hadron Era (10^-6 s to 1 s)

6. Lepton Era (1 s to 3 min)

7. Nucleosynthesis (3 min to 20 min)

8. Photon Era (3 min to 240,000 years)- Radiation dominated.

9. Star and Galaxy formation (300-500 million onwards)

10. Solar system formation (8-9 billion years)

11. Today (13.8 billion years).

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