On the quadratic action of the Hawking-Turok instanton

Details On the quadratic action of the Hawking-Turok instanton On the quadratic action of the Hawking-Turok instanton

1998-04-22

arxiv.org/abs/gr-qc/9804056v2

Phys.Rev. D58 (1998) 063505

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, REVTeX, 4 eps figures (included); statement concerning the CD solution is corrected and few other minor changes are m

Scientific paper

10.1103/PhysRevD.58.063505

Positive definiteness of the quadratic part of the action of the Hawking-Turok instanton is investigated. The Euclidean quadratic action for scalar perturbations is expressed in terms of a single gauge invariant quantity $q$. The mode functions satisfy a Schr\"odinger type equation with a potential $U$. It is shown that the potential $U$ tends to a positive constant at the regular end of the instanton. The detailed shape of $U$ depends on the initial data of the instanton, on parameters of the background scalar field potential $V$ and on a positive integer, $p$, labeling different spherical harmonics. For certain well behaved scalar field potentials it is proven analytically that for $p>1$ quadratic action is non-negative. For the lowest $p=1$ (homogeneous) harmonic numerical solution of the Schr\"odinger equation for different scalar field potentials $V$ and different initial data show that in some cases the potential $U$ is negative in the intermediate region. We investigated the monotonously growing potentials and a potential with a false vacuum. For the monotonous potentials no negative modes are found about the Hawking-Turok instanton. For a potential with the false vacuum the HT instanton is shown to have a negative mode for certain initial data.

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