PhysicsWallah’s blistering market debut is already losing its shine. Shares of the edtech company skidded as much as 9% to Rs 130.65 on the BSE on Thursday, pulling its market capitalization below Rs 37,700 crore and erasing nearly Rs 8,609 crore in just three sessions, an abrupt reversal that has rattled investors who only days ago cheered one of India’s most hyped IPOs of the year.