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l “Old’’ inflation <br />
Inflationary models <br />
Many inflationary models have been proposed so far. <br />
l Curvature inflation <br />
The higher-‐order curvature term leads to inflation. <br />
Lagrangian: <br />
Starobinsky (1980) <br />
Inflation occurs due to <strong>the</strong> first-‐order phase transition of a vacuum. <br />
Sato (1981), Kazanas (1980), Guth (1981) <br />
l Slow-‐roll inflation <br />
(first model of inflation) <br />
Inflation is driven by <strong>the</strong> potential energy of a scalar field. <br />
New, chaotic, power-‐law, hybrid, natural, extra-‐natural, eternal, D-‐term, <br />
F-‐term, brane, oscillating, tachyon, hill-‐top, KKLMMT, … (too many) <br />
l K-‐inflation <br />
Inflation is driven by <strong>the</strong> kinetic energy of a scalar field. <br />
Ghost condensate, DBI, Galileon,… <br />
l Inflation in extended <strong>the</strong>ories of gravity. <br />
Brans-‐Dicke, Higgs, Horndeski’s <strong>the</strong>ory,…. <br />
There are also multi-‐field models.
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