Inflation with a Negative Cosmological Constant

Details Inflation with a Negative Cosmological Constant Inflation with a Negative Cosmological Constant

2009-01-30

arxiv.org/abs/0901.4930v2

Phys.Rev.D80:023519,2009

Physics

High Energy Physics

High Energy Physics - Theory

replaced to match the journal version, title changed

Scientific paper

10.1103/PhysRevD.80.023519

We find a unique way of realizing inflation through cyclic phases in an universe with negative vacuum energy. According to the second law of thermodynamics entropy monotonically increases from cycle to cycle, typically by a constant factor. This means that the scale factor at the same energy density in consecutive cycles also increases by a constant factor. If the time period of the oscillations remain approximately constant then this leads to an ``over all'' exponential growth of the scale factor, mimicking inflation. A graceful exit from this inflationary phase is possible as a dynamical scalar field can take us from the negative to a positive energy vacuum during the last contracting phase.

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