Wide nutation: binary black-hole spins repeatedly oscillating from full alignment to full anti-alignment

Kavli Affiliate: Ulrich Sperhake

| First 5 Authors: Davide Gerosa, Alicia Lima, Emanuele Berti, Ulrich Sperhake, Michael Kesden

| Summary:

Within the framework of 2PN black-hole binary spin precession, we explore
configurations where one of the two spins oscillates from being completely
aligned with the orbital angular momentum to being completely anti-aligned with
it during a single precession cycle. This "wide nutation" is the extreme limit
of the generic phenomenon of spin nutation in black-hole binaries. Crucially,
wide nutation happens on the short precession time scale and it is not a
secular effect due to gravitational-wave radiation reaction. The spins of these
binaries, therefore, flip repeatedly as one of these special configurations is
entered. Binaries with total mass $M$, mass ratio $q$, and dimensionless spin
$chi_1$ ($chi_2$) of the more (less) massive black hole are allowed to
undergo wide nutation at binary separations $r leq r_{rm wide} equiv [(q
chi_2 – chi_1)/(1-q)]^2 M$. Sources that are more likely to nutate widely
have similar masses and effective spins close to zero.

| Search Query: ArXiv Query: search_query=au:”Ulrich Sperhake”&id_list=&start=0&max_results=10

Read More

Leave a Reply