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The Chiral and U(1)A Symmetries of t...

Lin, Zhongjie.

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The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions./
作者:	Lin, Zhongjie.
面頁冊數:	173 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.
Contained By:	Dissertation Abstracts International75-08B(E).
標題:	High energy physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3620323
ISBN:	9781303907432

The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions.
Lin, Zhongjie.

The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions. - 173 p.

Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.

Thesis (Ph.D.)--Columbia University, 2014.

With regard to the nature of the finite-temperature QCD phase transition and the fate of the chiral and anomalous axial symmetries associated with it, we present in this thesis two parallel sets of investigations into the QCD phase transition region between 139 and 195 MeV. Both studies adopt the Iwasaki gauge action augmented with the dislocation suppression determinant ratio with 2+1 flavors of chiral fermions. This choice of lattice action accurately reproduces the SU(2)L x SU(2)R and U (1)A symmtries of the continuum.

ISBN: 9781303907432Subjects--Topical Terms:

2144759
High energy physics.

The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions.
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245 1 4 $a The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions.
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500 $a Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.
500 $a Adviser: Norman H. Christ.
502 $a Thesis (Ph.D.)--Columbia University, 2014.
520 $a With regard to the nature of the finite-temperature QCD phase transition and the fate of the chiral and anomalous axial symmetries associated with it, we present in this thesis two parallel sets of investigations into the QCD phase transition region between 139 and 195 MeV. Both studies adopt the Iwasaki gauge action augmented with the dislocation suppression determinant ratio with 2+1 flavors of chiral fermions. This choice of lattice action accurately reproduces the SU(2)L x SU(2)R and U (1)A symmtries of the continuum.
520 $a The first study simulates QCD thermodynamics on a line of constant physics that represents 200 MeV pions and physical kaons using domain wall fermions (DWF) at three space-time volumes: 163 x 8, 24 3 x 8, and 323 x 8, where the largest volume varies in linear size between 5.6 fm (at T = 139 MeV) and 4.0 fm (at T = 195 MeV). The chiral condensates, connected and disconnected susceptibilities and the Dirac eigenvalue spectrum are reported and compared between different volumes as well as with the staggered results. We find a pseudo-critical temperature, Tc, of approximately 165 MeV and strong finite volume dependence below T c. Clear evidence is seen for U(1)A symmetry breaking above Tc which is quantitatively explained by the measured density of near-zero modes in accordance with the dilute instanton gas approximation.
520 $a The second study targets on a line of constant physics with pions of physical mass, which is the very first study using a chiral lattice fermion formulaation. We continue to use the basic setup from the m pi ≈ 200 MeV simulations, except that we use a generalized form of domain wall fermions, known as the Mobius fermions, to further reduce the residual chiral symmetry breaking present in the domain wall formulation with finite extent in the fifth dimension. Preliminary results including the chiral condensates and the susceptibilities are reported for two space-time volumes of 323 x 8 and 643 x 8. We observe a dramatic increase in the disconnected susceptibilities and a shift in the pseudo-critical temperature from 165 MeV to about 154 MeV, when the pion mass is decreased from 200 MeV to 135 MeV.
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