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https://hdl.handle.net/2440/52345
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Type: | Journal article |
Title: | Impact of dynamical fermions on QCD vacuum structure |
Author: | Moran, P. Leinweber, D. |
Citation: | Physical Review D: Particles, Fields, Gravitation and Cosmology, 2008; 78(5):054506-1-054506-7 |
Publisher: | American Physical Soc |
Issue Date: | 2008 |
ISSN: | 1550-7998 1550-2368 |
Statement of Responsibility: | Peter J. Moran and Derek B. Leinweber |
Abstract: | We examine how dynamical fermions affect both the UV and infrared structure of the QCD vacuum. We consider large 283×96 lattices from the MILC collaboration, using a gluonic definition of the topological charge density, founded on a new over-improved stout-link smearing algorithm. The algorithm reproduces established results from the overlap formalism and preserves nontrivial topological objects, including instantons. At short distances we focus on the topological charge correlator, <q(x)q(0)>, where negative values at small x reveal a sign-alternating layered structure to the topological-charge density of the QCD vacuum. We find that the magnitudes of the negative dip in the <q(x)q(0)> correlator and the positive <q(0)2> contact term are both increased with the introduction of dynamical fermion degrees of freedom. At large distances we examine the extent to which instanton-like objects are found on the lattice, and how their distributions vary between quenched and dynamical gauge fields. We show that dynamical gauge fields contain more instanton-like objects with an average size greater than in the quenched vacuum. Finally, we directly visualize the topological charge density in order to investigate the effects of dynamical sea-quark degrees of freedom on topology. |
Rights: | ©2008 American Physical Society |
DOI: | 10.1103/PhysRevD.78.054506 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1103/physrevd.78.054506 |
Appears in Collections: | Aurora harvest 5 Chemistry and Physics publications |
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hdl_52345.pdf | Published version | 1.23 MB | Adobe PDF | View/Open |
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