Abstract
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We are now routinely detecting gravitational waves (GW) emitted by
merging black holes and neutron stars. Those are the afterlives of
massive stars that formed all across the Universe - at different times
and with different metallicities.
Birth metallicity plays an important role in the evolution of massive
stars.
Consequently, the population properties of mergers are sensitive to the
metallicity dependent cosmic star formation history (fSFR(Z,z)).
In particular, within the isolated merger formation scenarios (the focus
of my talk), a strong low metallicity preference of the formation of
mergers involving black holes was found. I will disscuss its origin and
consequences.
Most importantly, the uncertainty in the fSFR(Z,z) (substantial even at
low redshifts, especially at low metallicity) cannot be ignored in the
models and makes the interpretation of current GW observations challenging.
I will summarize the recent efforts to determine fSFR(Z,z) and identify
factors that dominate its uncertainty. Many of those factors are related
to the properties of galaxies that are faint and distant (and therefore
difficult to observe). The fact that they leave imprint on the
properties of mergers as a function of cosmic time makes future GW
observations can potentially be used to study chemical evolution of
galaxies.

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Join Zoom Meeting
https://u-paris.zoom.us/j/89154692428?pwd=UFo5RVNvNFhEb2RSc1Fic3A0SzBBZz09

Meeting ID: 891 5469 2428
Passcode: 999118