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Science Context 2028

Scientific Landscape of 2028

eLISA´s science return in the likely context of the L2 launch date of 2028

Artist's impression of supermassive black hole. Credit: ESA/NASA, AVO project, Paolo Padovani.

Dust-bound supermassive black hole

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<p>Prof. Bernard Schutz<br />Albert Einstein Institute Potsdam-Golm</p><p>&nbsp;</p><p>Am Mühlenberg 1</p><p>14476 Potsdam, Germany</p><p>&nbsp;</p><p>Tel.: +49 (331) 567 - 7218</p><p>Fax: +49 (331) 567 - 7298</p>
<p>Prof. Monica Colpi</p><p>Università degli Studi di Milano-Bicocca</p><p>&nbsp;</p><p>Tel.: +39 02 6448 2357</p><p>Fax: +39 02 6448 2585</p><p>&nbsp;</p><p>Piazza della Scienza 3</p><p>20126 Milano - Italy</p>

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Given the state of knowledge in 2028 - what unique contributions can eLISA make to our likely understanding of fundamen­tal physics and astronomy at that time?

Naturally, science is not predictable, and the most interest­ing discoveries between now and 2028 will be the ones we cannot predict! But planned projects already hint at where the science frontiers will be when eLISA operates:

For ex­ample, massive progress can be expected in transient as­tronomy. Telescopes like the LSST and the Square Kilome­tre Array (SKA) will likely identify new systems that flare up irregularly or only once, and there is a good chance that some of these will be associated with gravitational wave signals.

As another example, extremely large telescopes (EELT, TMT, GMT) and large space telescopes (JWST) will be observing (proto-)galaxies at unprecedentedly high redshifts, at which eLISA will simultaneously observe indi­vidual merging black hole systems.

The expected progress in all kinds of electromagnetic astronomy will sharpen the need for complementary gravitational wave observations of the unseen universe, as well as providing a wealth of in­formation that will make it easier to identify the gravita­tional wave sources electromagnetically. eLISA will pioneer gravitational wave observations in the rich frequency band around 1 mHz.

In summary, by 2028 our understanding of the universe will have been dramatically improved by advanced observatories of electromagnetic radiation. Launching a millihertz gravitational wave observatory will add a new sense to our perception of the universe and enable us to listen to a world that is invisible with light.

eLISA will be the first-ever mission to survey the entire universe with gravitational waves. It will investigate the history of the universe back to redshifts of order 20, test gravity in the dynamical strong field regime, and probe the very early universe at a time when its energy scale was in the important TeV range. It will serve a unique role in the scientific landscape of 2028.

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

History of the Universe

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