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Probing the Inhomogeneous Universe with Gravitational Wave Cosmology

Apr, 2012

10 pages

Part of Gravitational waves. Numerical relativity - data analysis. Proceedings, 9th Edoardo Amaldi Conference, Amaldi 9, and meeting, NRDA 2011, Cardiff, UK, July 10-15, 2011

Published in:

J.Phys.Conf.Ser. 363 (2012) 012056

Contribution to:

- AMALDI 9 / NRDA 2011

e-Print:

1204.1670 [astro-ph.CO]

DOI:

10.1088/1742-6596/363/1/012056

View in:

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Abstract: (arXiv)

If we assume that we live in the center of a spherical inhomogeneous universe, we can explain the apparent accelerating expansion of the universe without introducing the unknown dark energy or modifying gravitational theory. Direct measurement of the cosmic acceleration can be a powerful tool in distinguishing

\Lambda

CDM and the inhomogeneous models. If

\Lambda

CDM is the correct model, we have shown that DECIGO/BBO has sufficient ability to detect the positive redshift drift of the source by observing gravitational waves from neutron star binaries for 5-10 years. This enables us to rule out any Lema\^itre-Tolman-Bondi (LTB) void model with monotonically increasing density profile. Furthermore, by detecting the positive redshift drift at

z\sim 0

, we can even rule out generic LTB models unless we allow unrealistically steep density gradient at

z\sim 0

. We also show that the measurement accuracy is slightly improved when we consider the joint search of DECIGO/BBO and the third generation Einstein Telescope. This test can be performed with GW observations alone without any reference to electromagnetic observations.

Note:

10 pages, 6 figures, accepted to Journal of Physics: Conference Series as Proceedings of Amaldi 9

expansion: acceleration
neutron star: binary
family: 3
cosmological model
gravitational radiation
redshift
density
Einstein Telescope
electromagnetic
gravitation

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