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EPJA Topical Collection: CompOSE: a repository for Neutron Star Equations of State and Transport Properties

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Published on 14 February 2023

Guest Editors: Danai Antonopoulou, Enrico Bozzo, Chikako Ishizuka, Ian Jones, Micaela Oertel, Constança Providencia, Laura Tolos and Stefan Typel

The CompOSE Topical Collection is a compendium of several works on neutron star equations of state (EoS) and transport properties related to the online repository CompOSE (CompStar Online Supernovae Equations of State).

CompOSE provides data tables for different state-of-the-art EoSs ready for further usage in astrophysical applications, nuclear physics and beyond, that is, for compact stars, core-collapse supernovae and neutron-star mergers (see https://compose.obspm.fr/). The main services that are offered via the website can be summarized as follows. First, it offers a collection of data tables in a flexible and easily extendable data format for different kind of EoSs and related physical quantities. No filters have been considered with respect to the approaches applied to obtain the provided EoS data. However, the available documentation on the EoS itself and related properties as well as the indicated references to the original work should allow each user to choose the best adapted EoSs concerning composition and properties. Second, it provides software to extract and interpolate these data and to compute additional quantities. Finally, it features webtools to generate EoS tables that can be customized to the needs of the users and allow these same users to illustrate dependencies of various EoS quantities in different graphical forms.

The articles that are part of the CompOSE Topical Issue have been developed under the umbrella of CompOSE. An introduction to the CompOSE repository is presented, as well as the detailed CompOSE manual for users and providers. Several contributions explore a range of effects (such as temperature, phase transitions, and new degrees of freedom) and experimental/astrophysical constraints on the EoS and associated quantities and provide new data to the CompOSE repository. Others investigate astrophysical applications, from supernova explosions to neutron star mergers, by making use of CompOSE.

All articles are available here and are freely accessible until 9 April 2023. For further information read the Editorial.

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On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)

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