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We consider the formation of double white dwarfs (DWDs) through dynamicalinteractions in globular clusters. Such interactions can give rise to eccentricDWDs, in contrast to the exclusively circular population expected to form inthe Galactic disk. We show that for a 5-year Laser Interferometer Space Antenna(LISA) mission and distances as far as the Large Magellanic Cloud, multipleharmonics from eccentric DWDs can be detected at a signal-to-noise ratio higherthan 8 for at least a handful of eccentric DWDs, given their formation rate andtypical lifetimes estimated from current cluster simulations. Consequently theassociation of eccentricity with stellar-mass LISA sources does not uniquelyinvolve neutron stars, as is usually assumed. Due to the difficulty ofdetecting (eccentric) DWDs with present and planned electromagneticobservatories, LISA could provide unique dynamical identifications of thesesystems in globular clusters.

Eccentric double white dwarfs as LISA sources in globular clusters