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Non extensive thermodynamics and neutron star properties

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arxiv 1410.2264 v3 pith:LNRA3KLN submitted 2014-10-08 nucl-th astro-ph.SRhep-ph

classification nucl-thastro-ph.SRhep-ph
keywords effectsequationsextensiveslightlystarstarsstatestellar
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abstract

In the present work we apply non extensive statistics to obtain equations of state suitable to describe stellar matter and verify its effects on microscopic and macroscopic quantities. Two snapshots of the star evolution are considered and the direct Urca process is investigated with two different parameter sets. $q$-values are chosen as 1.05 and 1.14. The equations of state are only slightly modified, but the effects are enough to produce stars with slightly higher maximum masses. The onsets of the constituents are more strongly affected and the internal stellar temperature decreases with the increase of the $q$-value, with consequences on the strangeness and cooling rates of the stars.

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  1. Constraints on dark matter self-interaction from velocity distribution function in isolated halos

    hep-ph 2025-05 conditional novelty 6.0 of 10

    N-body simulations and rotation-curve data constrain the dark matter self-interaction cross-section to σ/m ≤ 2.7 cm²/g at 95% C.L. for Milky Way-scale halos.

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