English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We extend the recently developed hybrid quark-meson-nucleon model byaugmenting a six-point scalar interaction and investigate the consequences forneutron-star sequences in the mass-radius diagram. The model has thecharacteristic feature that, at increasing baryon density, the chiral symmetryis restored within the hadronic phase by lifting the mass splitting betweenchiral partner states (parity doubling), before quark deconfinement takesplace. At low temperature and finite baryon density, the model predicts afirst-, second-order chiral phase transition, or a crossover, depending on theexpectation value of the scalar field, and a first-order deconfinement phasetransition. We discuss two sets of free parameters, which result incompact-star mass-radius relations that are at tension with the combinedconstraints for maximum-mass ($2~M_\odot$) and the compactness (GW170817). Wefind that the most preferable mass-radius relations result in isospin-symmetricphase diagram with rather low temperature for the critical point of the chiralphase transition.

Parity Doubling and the Dense Matter Phase Diagram under Constraints from Multi-Messenger Astronomy