What if GW190425 did not produce a black hole promptly?

Understand

It is widely believed that the binary neutron star merger GW190425 produced a black hole promptly upon merger.

• Motivated by the potential association with the fast radio burst FRB 20190425A, which took place 2.5~hours after the merger, we revisit the question of the outcome of GW190425 by means of numerical relativity simulations.
• We show that current laboratory and astrophysical constraints on the equation of state of dense matter do not rule out the formation of a long-lived remnant.
• However, the formation of a stable remnant would have produced a bright kilonova, in tension with upper limits by ZTF at the location and time of FRB 20190425A.