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A new crystalline phase in magnetar crusts
Paulo F. Bedaque, Simin Mahmoodifar, Nathan Ng +1
We show that ions at the low densities and high magnetic fields relevant to the outer crust of magnetars form a novel crystalline phase where ions are strongly coupled along the ma…
A Non-radial Oscillation Mode in an Accreting Millisecond Pulsar?
Tod Strohmayer, Simin Mahmoodifar
We present results of targeted searches for signatures of non-radial oscillation modes (such as r- and g-modes) in neutron stars using {\it RXTE} data from several accreting millis…
Friedel crystals and the outer crust of magnetars
Paulo F. Bedaque, Simin Mahmoodifar, Srimoyee Sen
The strong magnetic fields found on the surface of magnetars are known to have profound effects in the physics of atoms in magnetar envelopes. We argue that the Friedel oscillation…
Upper bounds on r-mode amplitudes from observations of low-mass X-ray binary neutron stars
Simin Mahmoodifar, Tod Strohmayer
We present upper limits on the amplitude of r-mode oscillations, and gravitational-radiation-induced spin-down rates, in low mass X-ray binary neutron stars, under the assumption t…