منابع مشابه
Generality of Topological Inflation
Many authors claimed that a large initial inhomogeneity prevents the onset of inflation and therefore inflation takes place only if the scalar field is homogeneous or appropriately chosen over the horizon scale. We show that those arguments do not apply to topological inflation. The core of a defect starts inflation even if it has much smaller size than the horizon and much larger gradient ener...
متن کاملGenerality of inflation in a planar universe.
abstract We study a generality of an inflationary scenario by integrating the Einstein equations numerically in a plane-symmetric spacetime. We consider the inhomogeneous spacetimes due to (i) localized gravitational waves with a positive cosmological constant Λ, and (ii) an inhomogeneous inflaton field Φ with a potential 1 2 m 2 Φ 2. For the case (i), we find that any initial inhomogeneities a...
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We propose a topological inflation model in supergravity. In this model, the vacuum expectation value (VEV) of a scalar field takes a value much larger than the gravitational scale MG ≃ 2.4 × 10 GeV, which is large enough to cause topological inflation. On the other hand, expansions of the Kähler potential and the superpotential beyond the gravitational scale are validated by the introduction o...
متن کاملTopological Inflation in Supergravity
We investigate a topological inflation model in supergravity. By means of numerical simulations, it is confirmed that topological inflation really takes place in supergravity. We also show that the condition for successful inflation depends not only on the vacuum-expectation value (VEV) of inflaton field but also on the form of its Kähler potential. In fact, it is found that the required VEV of...
متن کامل1 Topological Defect Inflation ∗
We address some issues of topological defect inflation. (1) We clarify the causal structure of an inflating magnetic monopole. The spacetime diagram shows explicitly that this model is free from the “graceful exit” problem, while the monopole itself undergoes “eternal inflation”. (2) We extend the study of inflating topological defects to Brans-Dicke gravity. Contrary to the case of Einstein gr...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2003
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/21/1/020