30_-_Big_Bang

# 30_-_Big_Bang - 30 The Big Bang Time Line Time = 13Gyr...

This preview shows pages 1–4. Sign up to view the full content.

30 - The Big Bang Time Line 2 Time = 13Gyr Temperature= 2.7K • The Earth is 4.6Byr old. • The universal expansion has been underway for ~13 Byr. • Biological units are able to change the climate, and send space probes to nearby planets. • Travel to the nearest stars is way beyond their capability. • Long term survival is still in question. 3 Time = 10 -46 s Temp. ~10 33 K • The end of the Planck era. • Before this time the quantum nature of gravity should be important, but it is unknown how. Forces: Theory Of Everything (TOE) 4 Time = 10 -36 s Temp. = 10 28 K • Grand Unification Theory (GUT) • Origin of matter and antimatter • Magnetic monopoles • Inflation Forces: Grand Unified Theory (GUT) & Gravity

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
5 6 G U T TOE 7 Time =10 -35 sec Temp. = 10 27 K The universe goes from 10 -50 m to ~1m in ~10 -35 sec corresponding to a ‘speed’ of 1 m/10 -35 sec ~ 10 35 m/sec! • Clearly this isn’t my father’s physics. •We are living in a small part of the Universe, and our little spot was •This rapid expansion “solves” the flatness and horizon problems. •However, we have lost contact with the rest of the Universe. 8 Time = 10 -12 sec Temp. 10 15 K • The Electromagnetic force becomes indistinguishable from the Weak Force. • They are “unified.” • The surviving forces are the Electroweak and Gravity. Forces: Electroweak, Strong and Gravity
Time = 10 -8 sec Temp. = 10 14 K • The Electromagnetic and Weak forces are separated. • The four forces we now recognize are in place for the rest of time. Or are there more forces to come? 10 Time = 1s Temp. = 10 10 K • Most of the p and n are gone • Only a small fraction (10 -10 ) of the protons survive. Why is there a difference in the number of p and p? • e - + e + 2 γ • n photons ~ 10 9 (n p + n n ) • n n ~ 1/6 n p 11 Time = 14 s Temp. =3x10 9 K • e - + e + 2 γ • The electrons are now mostly gone. • 17% n and 83% p (Things are moving so

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/05/2009 for the course ASTRO 3332 taught by Professor Houck,j during the Spring '09 term at Cornell.

### Page1 / 12

30_-_Big_Bang - 30 The Big Bang Time Line Time = 13Gyr...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online