Articles

eLISA Mission

eLISA: The Mission

Gravity is the dominant force in the universe.

Artist's impression of eLISA satellite. Credit: AEI/MM/exozet/NASA/Henze

eLISA - spacecraft passing gravitational waves

Contact

Prof. Dr. Karsten Danzmann
Albert Einstein Institute Hannover

 

Callinstr. 38

30167 Hannover, Germany

 

Tel.: +49 (511) 762 - 2229

Fax: +49 (511) 762 - 2784

eLISA will be the first observatory in space to explore the Gravitational Universe. It will gather revolutionary information about the dark universe.

eLISA will complement our knowledge about the beginning, evolution and structure of our universe.

The Gravitational Universe is a science theme aiming to explore the Astrophysical Universe and the Laws of Nature. Carriers of this information are low frequency gravitational waves in the milli-Hertz frequency range, emitted by coalescing binary black holes and ultra-compact galactic binaries.

Gravitational waves travel undisturbed through spacetime. Thus, the cosmic horizon of the Gravitational Universe is the deepest and widest possible.

A suitable instrument for measuring gravitational waves over a broad band of low frequencies is a laser interferometer with an arm length as large as possible and long integration times, the primary impetus for a space-borne detector. Hence eLISA can be thought of basically as a high precision Michelson interferometer in space with an arm length of 1 mil­lion km. The arm length has been carefully chosen to allow observation of most of the interesting sources of gravitational waves.

eLISA will complement traditional astronomical observations based on the electromagnetic spectrum (for example, observations from visible light, infra-red or x-rays). It will open the gravitational wave window in space and measure gravitational radiation over a broad band of frequencies, from about 0.1 mHz to 100 mHz, a band where the Universe is richly populated by strong sources of gravitational waves.

Attached videos

eLISA will be the largest man-made structure ever - a giant laser observatory in space to probe the Dark Side of the Universe.