View : 20 Download: 9

Gravitational waves from cosmic bubble collisions

Title
Gravitational waves from cosmic bubble collisions
Authors
Kim, Dong-HoonLee, Bum-HoonLee, WonwooYang, JongmannYeom, Dong-han
Ewha Authors
양종만
SCOPUS Author ID
양종만scopus
Issue Date
2015
Journal Title
EUROPEAN PHYSICAL JOURNAL C
ISSN
1434-6044JCR Link1434-6052JCR Link
Citation
vol. 75, no. 3
Publisher
SPRINGER
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Cosmic bubbles are nucleated through the quantum tunneling process. After nucleation they would expand and undergo collisions with each other. In this paper, we focus in particular on collisions of two equal-sized bubbles and compute gravitational waves emitted from the collisions. First, we study the mechanism of the collisions by means of a real scalar field and its quartic potential. Then, using this model, we compute gravitational waves from the collisions in a straightforward manner. In the quadrupole approximation, time-domain gravitational waveforms are directly obtained by integrating the energy-momentum tensors over the volume of the wave sources, where the energy-momentum tensors are expressed in terms of the scalar field, the local geometry and the potential. We present gravitational waveforms emitted during (i) the initial-to-intermediate stage of strong collisions and (ii) the final stage of weak collisions: the former is obtained numerically, in full General Relativity and the latter analytically, in the flat spacetime approximation. We gain qualitative insights into the time-domain gravitational waveforms from bubble collisions: during (i), the waveforms show the non-linearity of the collisions, characterized by a modulating frequency and cusp-like bumps, whereas during (ii), the waveforms exhibit the linearity of the collisions, featured by smooth monochromatic oscillations.
DOI
10.1140/epjc/s10052-015-3348-2
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
001.pdf(1.19 MB)Download
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE