Particle Physics and Cosmology

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Particle Physicsand Cosmology

• Phase transitions

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baryogenesis during electroweak phase transition
?
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Sakharovs conditions forbaryogenesis during
electroweak phase transition

• baryon number violation interactions ?
• charge conjugation violating interactions ?
• CP violating interactions ?
• non equilibrium process ?

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baryogenesis during electroweak phase transition
?

• strongly first order electroweak phase transition
  can generate baryon asymmetry if CP violation is
  sufficiently strong
• no efficient baryogenesis for weak first order
  phase transition, second order phase transition
  or crossover
• presumably too little CP violation in SM ( not
  definitely settled )

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electroweak phase transition
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order of phase transition
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temperature dependent effective potential

• T 0
• high temperature
• expansion

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next to leading order in high temperature
expansion
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first order cosmological phase transitions
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chaos in the Universe
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relics from cosmological first order phase
transitions ?
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electroweak crossover
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critical mass of the Higgs scalar for the onset
of crossover
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electroweak phase transition in standard model
is crossover !
perhaps strong first order transition in
supersymmetric extensions of standard model
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standard model of particle physics and cosmology

• no candidate for dark matter
• no baryon asymmetry
• no massive neutrinos

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standard model of particle physics and cosmology

• prediction
• present Universe consists of
• photons and
• massless neutrinos

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