24,823 research outputs found
Inflationary attractors from nonminimal coupling
We show explicitly how the E model attractor is obtained from the general
scalar-tensor theory of gravity with arbitrary conformal factors in the strong
coupling limit. By using conformal transformations, any attractor with the
observables and can be obtained. The existence of attractors imposes
a challenge to distinguish different models.Comment: 5 pages, 1 figures, prepared for the proceedings of the International
Conference on Gravitation : Joint Conference of ICGAC-XIII and IK1
Does observational equivalence always hold in hyperbolic discounting models?
Observation equivalence holds in the hyperbolic discounting models such as Laibson (1996), Barro (1999), and Krusell et al (2002). We study a hyperbolic discounting model where the policy function cannot be replicated by a geometric discounting model. Under the logarithmic utility and Cobb-Douglas production, we obtain the explicit solution for consumer's consumption-saving decision. Different from the literatures of exponential discounting, our model shows that the habit persistence affects consumer''s consumption-saving decision. Therefore, observational equivalence does not hold in our hyperbolic discounting model.Consumption function
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