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Inflation, infinity, equilibrium and the observable Universe Andreas Albrecht UC Davis

Inflation, infinity, equilibrium and the observable Universe Andreas Albrecht UC Davis

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## Inflation, infinity, equilibrium and the observable Universe Andreas Albrecht UC Davis

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**Inflation, infinity, equilibrium and the observable Universe**Andreas Albrecht UC Davis UCD Colloquium October 3, 2011 A. Albrecht @ UCD 10/3/11**Cosmic Inflation:**• Great phenomenology, but • Original goal of explaining why the cosmos is *likely* to take the form we observe has proven very difficult to realize. A. Albrecht @ UCD 10/3/11**Cosmic Inflation:**• Great phenomenology, but • Original goal of explaining why the cosmos is *likely* to take the form we observe has proven very difficult to realize. This Talk A. Albrecht @ UCD 10/3/11**Cosmic Inflation:**• Great phenomenology, but • Original goal of explaining why the cosmos is *likely* to take the form we observe has proven very difficult to realize. • OR: Just be happy we have equations to solve? A. Albrecht @ UCD 10/3/11**OUTLINE**Big Bang & inflation basics Eternal inflation de Sitter Equilibrium cosmology Cosmic curvature from de Sitter Equilibrium cosmology A. Albrecht @ UCD 10/3/11**OUTLINE**Big Bang & inflation basics Eternal inflation de Sitter Equilibrium cosmology Cosmic curvature from de Sitter Equilibrium cosmology A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**Curvature A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**Curvature Relativistic Matter A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**Curvature Non-relativistic Matter Relativistic Matter A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**Dark Energy Curvature Non-relativistic Matter Relativistic Matter A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**! A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**! A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**! A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**A. Albrecht @ UCD 10/3/11**The curvature feature/“problem”**! A. Albrecht @ UCD 10/3/11**The monopole “problem”**A. Albrecht @ UCD 10/3/11**The monopole “problem”**! A. Albrecht @ UCD 10/3/11**Friedmann Eqn.**Dark Energy Curvature Non-relativistic Matter Relativistic Matter A. Albrecht @ UCD 10/3/11**Now add cosmic inflation**Friedmann Eqn. Dark Energy Inflaton Curvature Non-relativistic Matter Relativistic Matter A. Albrecht @ UCD 10/3/11**Now add cosmic inflation**Friedmann Eqn. Dark Energy Inflaton Curvature Non-relativistic Matter Relativistic Matter A. Albrecht @ UCD 10/3/11**The inflaton:**~Homogeneous scalar field obeying Cosmic damping Coupling to ordinary matter All potentials have a “low roll” (overdamped) regime where A. Albrecht @ UCD 10/3/11**The inflaton:**~Homogeneous scalar field obeying Cosmic damping Coupling to ordinary matter All potentials have a “low roll” (overdamped) regime where A. Albrecht @ UCD 10/3/11**Add a period of Inflation:**A. Albrecht @ UCD 10/3/11**With inflation, initially large curvature is OK:**A. Albrecht @ UCD 10/3/11**With inflation, early production of large amounts of**non-relativistic matter (monopoles) is ok : A. Albrecht @ UCD 10/3/11**Inflation detail:**A. Albrecht @ UCD 10/3/11**Inflation detail:**A. Albrecht @ UCD 10/3/11**Hubble Length**A. Albrecht @ UCD 10/3/11**Hubble Length**(aka ) A. Albrecht @ UCD 10/3/11**End of inflation**A. Albrecht @ UCD 10/3/11**End of reheating**A. Albrecht @ UCD 10/3/11