Before revision:  They define analogues of magnetic field h and the inverse temperature (\beta) in Ising model\beta*\beta* \beta*  . Sparks terminate via a phase transition known as "hpolarity reversal" and the leak emerges when hfails to change its sign. This happens when the SR depletes insufficiently and RyR openings remained partially synchronized via Ca-induced-Ca-release, generating long-lasting sparks. Leak can also occur via \beta, known as Onsager's "order-disorder" transition. This happens at low SR Ca, reducing RyR current and RyRs interactions, resulting in independent RyR openings.
After revision:  They define analogues of magnetic field h and the inverse temperature (\beta) in Ising model\beta*\beta* \beta* .