Colloquium by Jonathan Feng - Fermilab Center for Particle ...
Colloquium by Jonathan Feng - Fermilab Center for Particle ... Colloquium by Jonathan Feng - Fermilab Center for Particle ...
(1) Assume a new heavy particle X is initially in thermal equilibrium: XX ↔⎯ qq (2) Universe cools: XX ⎯ qq → ← / (3) Universe expands: XX → ← ⎯ qq / FREEZE OUT Zeldovich et al. (1960s) (1) 23 Mar 11 Feng 8 (2) Feng, ARAA (2010) Increasing annihilation strength ↓ (3)
23 Mar 11 THE WIMP MIRACLE 10-3 σ0 10-1 10 σ0 -2 σ0 σ 0 10 σ 0 102 σ0 103 σ0 • The relation between Ω X and annihilation strength is wonderfully simple: • m X ~ 100 GeV, g X ~ 0.6 Ω X ~ 0.1 • Remarkable coincidence: particle physics independently predicts particles with the right density to be dark matter X X q _ q Feng 9
- Page 1 and 2: WIMP PARADIGM: CURRENT STATUS FNAL
- Page 3 and 4: THE COSMIC CONNECTION, c. 1977 “O
- Page 5 and 6: DARK MATTER Known DM properties •
- Page 7: 23 Mar 11 THE WEAK MASS SCALE • F
- Page 11 and 12: LEP’S COSMOLOGICAL LEGACY Gauge H
- Page 13 and 14: INDIRECT DETECTION Dark Matter anni
- Page 15 and 16: ARE THESE DARK MATTER? • Energy s
- Page 17 and 18: DIRECT DETECTION • Can look for n
- Page 19 and 20: LOWER LIMIT ON DIRECT DETECTION •
- Page 21 and 22: LOW MASS FRONTIER Collision rate sh
- Page 23 and 24: SPIN-DEPENDENT SCATTERING 23 Mar 11
- Page 25 and 26: CURRENT BOUNDS FOR SUSY Yellow: pre
- Page 27 and 28: 23 Mar 11 THE SIGNIFICANCE OF 10 -4
- Page 29 and 30: BEYOND WIMPS • Does the WIMP para
- Page 31 and 32: FREEZE OUT WITH SUPERWIMPS WIMPs fr
- Page 33 and 34: WARM SUPERWIMPS • SuperWIMPs are
- Page 35 and 36: • In SUSY, however, there may be
- Page 37: CONCLUSIONS • Particle Dark Matte
(1) Assume a new heavy<br />
particle X is initially in<br />
thermal equilibrium:<br />
XX ↔⎯ qq<br />
(2) Universe cools:<br />
XX ⎯ qq<br />
→<br />
← /<br />
(3) Universe expands:<br />
XX<br />
→<br />
← ⎯ qq / FREEZE OUT<br />
Zeldovich et al. (1960s)<br />
(1)<br />
23 Mar 11 <strong>Feng</strong> 8<br />
(2)<br />
<strong>Feng</strong>, ARAA (2010)<br />
Increasing<br />
annihilation<br />
strength<br />
↓<br />
(3)
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