The Origin of the Matter- Antimatter Asymmetry: Will we ever know? Michael Dine SLAC Conference on Heavy Flavor Physics at High Luminosity e+e- Colliders.

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Presentation transcript:

The Origin of the Matter- Antimatter Asymmetry: Will we ever know? Michael Dine SLAC Conference on Heavy Flavor Physics at High Luminosity e+e- Colliders May, 2003

The Asymmetry From Nucleosynthesis:  B h 2 = § From CMBR:   B h 2 = §

Sakharov Conditons Violation of Baryon Number at the level of the fundamental laws An Arrow of Time CP Violation

u u d d^c e+e+ oo X e+e+e+e+

X X

M W =g  M W =0

[ Cline,Joyce and Kainulainen, 1998]

N l N l h

 V 

Scalar in condensate

PROSPECTS Cosmology and Microphysics Nucleosynthesis: we can calculate the dark matter density from our knowledge of microphysics. Dark Matter: We might calculate the dark matter density in the future if supersymmetry is discovered, and the properties of superparticles measured (esp. masses – linear collider); or if we discover axions. Both scenarios require (plausible) assumptions about the early universe. Inflation: probably requires theoretical as well as observational input (string theory?).

Baryogenesis: we have narrowed the possibilities, but: With neutrino mass, we may have encountered a basic clue to the origin of the matter-antimatter asymmetry. Measurements plus theoretical developments will be necessary to a calculation of the asymmetry. Discovery of supersymmetry would open up new possibilities (coherent production, electroweak baryogenesis). But theory as well as experiment will be necessary. In either case, further theoretical progress will surely require more theoretical input on the questions of flavor and CP violation.