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A Superfluid Perspective on Neutron Star Dynamics

Superfluid Neutron Matter with a Twist

Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
Author to whom correspondence should be addressed.
Academic Editor: Nicolas Chamel
Universe 2021, 7(2), 24;
Received: 7 December 2020 / Revised: 20 January 2021 / Accepted: 21 January 2021 / Published: 26 January 2021
(This article belongs to the Special Issue Superfluidity and Superconductivity in Neutron Stars)
Superfluid neutron matter is a key ingredient in the composition of neutron stars. The physics of the inner crust are largely dependent on those of its S-wave neutron superfluid, which has made its presence known through pulsar glitches and modifications in neutron star cooling. Moreover, with recent gravitational-wave observations of neutron star mergers, the need for an equation of state for the matter of these compact stars is further accentuated and a model-independent treatment of neutron superfluidity is important. Ab initio techniques developed for finite systems can be guided to perform extrapolations to the thermodynamic limit and attain this model-independent extraction of various quantities of infinite superfluid neutron matter. To inform such an extrapolation scheme, we performed calculations of the neutron 1S0 pairing gap using model-independent odd–even staggering in the context of the particle-conserving, projected Bardeen–Cooper–Schrieffer (BCS) theory under twisted boundary conditions. While the practice of twisted boundary conditions is standard in solid-state physics and has been used repeatedly in the past to reduce finite-size effects, this is the first time that it has been employed in the context of pairing. We find that a twist-averaging approach results in a substantial reduction of the finite-size effects, bringing systems with N50 within a 2% error margin from the infinite system. This can significantly reduce extrapolation-related errors in the extraction of superfluid neutron matter quantities. View Full-Text
Keywords: pairing; superfluidity; neutron matter; BCS theory; finite-size effects pairing; superfluidity; neutron matter; BCS theory; finite-size effects
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MDPI and ACS Style

Palkanoglou, G.; Gezerlis, A. Superfluid Neutron Matter with a Twist. Universe 2021, 7, 24.

AMA Style

Palkanoglou G, Gezerlis A. Superfluid Neutron Matter with a Twist. Universe. 2021; 7(2):24.

Chicago/Turabian Style

Palkanoglou, Georgios, and Alexandros Gezerlis. 2021. "Superfluid Neutron Matter with a Twist" Universe 7, no. 2: 24.

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