What do exotic equations of state have to offer?

Abstract

We present a short general overview of the main features of exotic models of neutron stars, focusing on the structural and dynamical predictions derived from them. In particular, we discuss the presence of ``normal'' quark matter and Color-Flavor Locked (CFL) states, including their possible self-bound versions, and mention some different proposals emerging from the study of QCD microphysics. A connection with actual observed data is the main goal to be addressed at this talk and along the meeting. It is demonstrated that exotic equations of state are {\it not} soft if the vacuum contributions are large enough, and argued that recent measurements of high pulsar masses ($M\ge 2M_{\odot }$) create problems for {\it hadronic} models in which hyperons should be present.

arXiv comment8 pages, 2 figures. To be published in the Proceedings of the conference "Isolated Neutron Stars: from the Interior to the Surface" (April 24-28, 2006, London, UK), eds. D. Page, R. Turolla, & S. Zane

References in corpus (14)

• Strange Quark Matter and Compact Stars
• Physical Acceptability of Isolated, Static, Spherically Symmetric, Perfect Fluid Solutions of Einstein's Equations
• EXO 0748-676 Rules out Soft Equations of State for Neutron Star Matter
• A 2.1 Solar Mass Pulsar Measured by Relativistic Orbital Decay
• Measuring and Understanding the Universe
• Color-flavor locked strange matter
• High-density QCD pairing in compact star structure
• The Stability of Strange Star Crusts and Strangelets
• Strangelet propagation and cosmic ray flux
• Radiation from condensed surface of magnetic neutron stars
• Phase diagram of dense neutral three-flavor quark matter
• Phase diagram of neutral quark matter in nonlocal chiral quark models
• Deconfinement and color superconductivity in cold neutron stars
• Single-flavour and two-flavour pairing in three-flavour quark matter

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