Inflation and reheating in induced gravity

被引：38
|
作者：
Cerioni, A. [2 ,3 ]
Finelli, F. [1 ,3 ,4 ]
Tronconi, A. [2 ,3 ]
Venturi, G. [2 ,3 ]
机构：
[1] Ist Astrofis Spaziale & Fis Cosm Bologna, INAF IASF Bologna, I-40129 Bologna, Italy
[2] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy
[3] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy
[4] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy
来源：
PHYSICS LETTERS B | 2009年 / 681卷 / 05期
关键词：
BROKEN-SYMMETRIC THEORY; PERTURBATIONS; SPECTRA;
D O I：
10.1016/j.physletb.2009.10.066
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Inflation is studied in the context of induced gravity (IG) gamma sigma R-2, where R is the Ricci scalar, sigma a scalar field and gamma a dimensionless constant. We study in detail cosmological perturbations in IG and examine both a Landau-Ginzburg (LG) and a Coleman-Weinberg (CW) potential toy models for small field and large field (chaotic) inflation and find that small field inflationary models in IG are constrained to gamma less than or similar to 3 x 10(-3) by WMAP 5-yrs data. Finally we describe the regime of coherent oscillations in induced gravity by an analytic approximation, showing how the homogeneous inflaton can decay in its short-scale fluctuations when it oscillates around a non-zero value sigma(0). (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：383 / 386
页数：4
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