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LISALISA - iucaa

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Contents<br />

Mission Summary Table<br />

Foreword<br />

iii<br />

v<br />

Executive Summary 1<br />

The nature of gravitational waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1<br />

Sources of gravitational waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2<br />

Complementarity with ground-based observations . . . . . . . . . . . . . . . . . . . . 3<br />

The LISA mission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4<br />

1 Scientific Objectives 7<br />

1.1 Theory of gravitational radiation . . . . . . . . . . . . . . . . . . . . . . . . . . 7<br />

1.1.1 General relativity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7<br />

1.1.2 The nature of gravitational waves in general relativity . . . . . . . . . . 12<br />

1.1.3 Generation of gravitational waves . . . . . . . . . . . . . . . . . . . . . . 14<br />

1.1.4 Other theories of gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />

1.2 Low-frequency sources of gravitational radiation . . . . . . . . . . . . . . . . . 18<br />

1.2.1 Galactic binary systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 21<br />

1.2.2 Massive black holes in distant galaxies . . . . . . . . . . . . . . . . . . . 25<br />

1.2.3 Primordial gravitational waves . . . . . . . . . . . . . . . . . . . . . . . 31<br />

2 Different Ways of Detecting Gravitational Waves 35<br />

2.1 Detection on the ground and in space . . . . . . . . . . . . . . . . . . . . . . . 35<br />

2.2 Ground-based detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36<br />

2.2.1 Resonant-mass detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 36<br />

2.2.2 Laser Interferometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37<br />

2.3 Pulsar timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39<br />

2.4 Spacecraft tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40<br />

2.5 Space interferometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40<br />

2.6 Early concepts for a laser interferometer in space . . . . . . . . . . . . . . . . . 41<br />

2.7 Heliocentric versus geocentric options . . . . . . . . . . . . . . . . . . . . . . . 43<br />

3 The LISA Concept – An Overview 45<br />

3.1 The LISA flight configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45<br />

3.2 The LISA orbits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45<br />

3.3 The three LISA spacecraft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46<br />

3.4 The payload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48<br />

Corrected version 1.04 ix 13-9-2000 11:47

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