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Check directly vs data• That is, apply new effective force directly to calculate nuclear properties using Hartree-Fock (as for usual well known force)
• Where analytic form of (e.g. H0 + H3 ) piece of energy functional derived from QMC is:
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Operated by Jefferson Science Association for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
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Check directly vs data• That is, apply new effective force directly to calculate nuclear properties using Hartree-Fock (as for usual well known force)
• Where analytic form of (e.g. H0 + H3 ) piece of energy functional derived from QMC is:
highlights scalar polarizability
» 4% » 1%
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Operated by Jefferson Science Association for the U.S. Department of Energy
Thomas Jefferson National Accelerator Facility
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Check directly vs data• That is, apply new effective force directly to calculate nuclear properties using Hartree-Fock (as for usual well known force) – for example:
• In comparison with the SkM force:
and full energy functional in both cases is:
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Finite Hypernuclei with New QMC
Guichon, Matevosyan, Thomas, Tsushima, to appear
• Relativistic Hartree only: still well described
• unbound or barely bound – big improvement
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Thomas Jefferson National Accelerator Facility
Operated by the Southeastern Universities Research Association for the U.S. Department of Energy
Consequences for Neutron Star New QMC model, fully relativistic, Hartree-Fock treatment
Stone, Guichon, Matevosyan, Thomas, to appear
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Recently Developed Covariant ModelBuilt on the Same Physical Ideas
• Use NJL model (‘al symmetry)
• Ensure confinement through proper time regularization (following the Tübingen group)
• Self-consistently solve Faddeev Eqn. in mean scalar field
• This solves chiral collapse problem common for NJL (because of scalar polarizability again)
• Can test against experiment – e.g. spin-dependent EMC effect
• Also apply same model to NM, NQM and SQM – hence n-star
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• Observation stunned and electrified the HEP and Nuclear communities 20 years ago
• Nearly 1,000 papers have been generated…..
• What is it that alters the quark momentum in the nucleus?
Classic Illustration: The EMC effect
J. Ashman et al., Z. Phys. C57, 211 (1993)
J. Gomez et al., Phys. Rev. D49, 4348 (1994)
The EMC Effect: Nuclear PDFs
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p
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gg
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g1(A) – “Polarized EMC Effect”• Calculations described here ) larger effect for polarized structure
than unpolarized: mean scalar field modifies lower components of the confined quark’s Dirac wave function
• Spin-dependent parton distribution functions for nuclei unmeasured
( Cloet, Bentz, AWT, PRL 95 (2005) 0502302 )
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Recent Calculations for Finite Nuclei
Cloet, Bentz, Thomas, Phys. Lett. , to appear 2006 (nucl-th/0605061)
Spin dependent EMC effect TWICE as large as unpolarized
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Lawley, Bentz, AWT, nucl-th/0602014 (J Phys G)
Phases of Dense Matter : NM (! NQM) ! SQM
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EOS of Dense Matter – n Star Properties
Naturally leads to low mass, hybrid n stars with masses » independent of the central density
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EOS of Dense Matter – n Star Properties
N.B. Hyperons in NM phase would tend to raise transition densitya little - still need to include these….
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Mass vs Radius with Consistent Treatment of Hadron Structure and Quark Matter
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