Vacuum birefringence time delays from magnetars are an order of magnitude larger than previous estimates and should be quantitatively measurable by IXPE and eXTP, especially for 1RXS J170849.0-400910.
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Detectability of Magnetar-Induced Vacuum Birefringence with IXPE and eXTP
Vacuum birefringence time delays from magnetars are an order of magnitude larger than previous estimates and should be quantitatively measurable by IXPE and eXTP, especially for 1RXS J170849.0-400910.