# What is a “quasi-local” charge?

Could someone please tell me what is a quasi-local charge? For instance, why are Brown-York charges called quasi-local?

• Thx for your answer. So for instance in the case of the BY quasilocal charge given by $$\int_\Sigma \mathrm{d}^3x \sqrt{\sigma} u_a T^{ab} \xi_b$$, what are the local and non-local quantities that it depends on? – Y2H May 11 '20 at 15:20
• @Y2H You can see all of the quantities it depends on in the integrand. You integrate these quantities over some finite region $\Sigma$, which makes the charge quasilocal, since the charge depends on the values of those quantities in a finite spacetime region. – probably_someone May 11 '20 at 16:48