title: Schwarzschild black holes can wear scalar wigs.
abstract: We study the evolution of a massive scalar field surrounding a Schwarzschild black hole and find configurations that can survive for arbitrarily long times, provided the black hole or the scalar field mass is small enough. In particular, both ultralight scalar field dark matter around supermassive black holes and axionlike scalar fields around primordial black holes can survive for cosmological times. Moreover, these results are quite generic in the sense that fairly arbitrary initial data evolve, at late times, as a combination of those long-lived configurations.
authors.affiliation: Departamento de Física, División de Ciencias e Ingeniería, Campus León, Universidad de Guanajuato, León 37150, Mexico.
authors.forename: Juan
authors.initials: J
authors.lastname: Barranco
authors.forename: Argelia
authors.initials: A
authors.lastname: Bernal
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Degollado
authors.forename: Alberto
authors.initials: A
authors.lastname: Diez-Tejedor
authors.forename: Miguel
authors.initials: M
authors.lastname: Megevand
authors.forename: Miguel
authors.initials: M
authors.lastname: Alcubierre
authors.forename: Darío
authors.initials: D
authors.lastname: Núñez
authors.forename: Olivier
authors.initials: O
authors.lastname: Sarbach