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LISA sensitivities to gravitational waves from relativistic metric theories of gravity

Massimo Tinto*

Márcio Eduardo da Silva Alves†

  • Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA

  • INPE, Instituto Nacional de Pesquisas Espaciais, Divisão de Astrofísica, Avenida dos Astronautas 1758, São José dos Campos, 12227-010 SP, Brazil

  • *Massimo.Tinto@jpl.nasa.gov
  • †Present address: Instituto de Ciências Exatas, Universidade Federal de Itajubá, 37500-903 Itajubá, MG, Brazil. alvesmes@unifei.edu.br
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Phys. Rev. D 82, 122003 – Published 20 December, 2010

DOI: https://doi.org/10.1103/PhysRevD.82.122003

Abstract

The direct observation of gravitational waves will provide a unique tool for probing the dynamical properties of highly compact astrophysical objects, mapping ultrarelativistic regions of space-time, and testing Einstein’s general theory of relativity. LISA (Laser Interferometer Space Antenna), a joint National Aeronautics and Space Administration and European Space Agency mission to be launched in the next decade, will perform these scientific tasks by detecting and studying low-frequency cosmic gravitational waves through their influence on the phases of six modulated laser beams exchanged between three remote spacecraft. By directly measuring the polarization components of the waves LISA will detect, we will be able to test Einstein’s theory of relativity with good sensitivity. Since a gravitational wave signal predicted by the most general relativistic metric theory of gravity accounts for six polarization modes (the usual two Einstein’s tensor polarizations as well as two vector and two scalar wave components), we have derived the LISA time-delay interferometric responses and estimated their sensitivities to vector- and scalar-type waves. We find that (i) at frequencies larger than roughly the inverse of the one-way light time (≈6×10−2  Hz), LISA is more than ten times sensitive to scalar-longitudinal and vector signals than to tensor and scalar-transverse waves, and (ii) in the low part of its frequency band is equally sensitive to tensor and vector waves and somewhat less sensitive to scalar signals.

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See Also

Pulsar timing sensitivities to gravitational waves from relativistic metric theories of gravity

Márcio Eduardo da Silva Alves and Massimo Tinto
Phys. Rev. D 83, 123529 (2011)

Article Text

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Phys. Rev. D 82, 122003– Published 20 December, 2010
  • Received 6 October 2010

© 2010 The American Physical Society

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