Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/119131
Title: Local measurement of $Lambda$ using pulsar timing arrays
Author: Espriu, D. (Domènec)
Puigdomènech, Daniel
Keywords: Ones gravitacionals
Estels de neutrons
Gravitational waves
Neutron stars
Issue Date: Feb-2013
Publisher: Institute of Physics (IOP)
Abstract: We consider the propagation of gravitational waves (GWs) in de Sitter spacetime and how a non-zero value of the cosmological constant might affect their detection in pulsar timing arrays (PTAs). If Λ ≠ 0, the waves are anharmonic in Friedmann-Robertson-Walker coordinates, and although this effect is very small it gives rise to noticeable consequences for GWs originating in extragalactic sources such as spiraling black hole binaries. The results indicate that the timing residuals induced by GWs from such sources in PTAs will show a peculiar angular dependence with a marked enhancement around a particular value of the angle subtended by the source and the pulsars, depending mainly on the actual value of the cosmological constant and the distance to the source. The position of the peak could represent a gauge of the value of Λ. The enhancement that the new effect brings about could facilitate the first direct detection of GWs while representing a local measurement of Λ.
Note: Reproducció del document publicat a: https://doi.org/10.1088/0004-637X/764/2/163
It is part of: Astrophysical Journal, 2013, vol. 764, num. 2
Related resource: https://doi.org/10.1088/0004-637X/764/2/163
URI: http://hdl.handle.net/2445/119131
ISSN: 0004-637X
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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