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  <doc>
    <id>881</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
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    <type>reportzib</type>
    <publisherName/>
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    <completedDate>2005-11-24</completedDate>
    <publishedDate>2005-11-24</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Probing the Aoki phase with N_f=2 Wilson fermions at finite temperature</title>
    <abstract language="eng">In this letter we report on a numerical investigation of the Aoki phase in the case of finite temperature which continues our former study at zero temperature. We have performed simulations with Wilson fermions at $\beta=4.6$ using lattices with temporal extension $N_{\tau}=4$. In contrast to the zero temperature case, the existence of an Aoki phase can be confirmed for a small range in $\kappa$ at $\beta=4.6$, however, shifted slightly to lower $\kappa$. Despite fine-tuning $\kappa$ we could not separate the thermal transition line from the Aoki phase.</abstract>
    <identifier type="serial">05-48</identifier>
    <identifier type="opus3-id">881</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-8812</identifier>
    <author>Ernst-Michael Ilgenfritz</author>
    <author>Werner Kerler</author>
    <author>Michael Müller-Preussker</author>
    <author>Andre Sternbeck</author>
    <author>Hinnerk Stüben</author>
    <series>
      <title>ZIB-Report</title>
      <number>05-48</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Wilson fermions</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>phase diagram</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>parity-flavor symmetry</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Aoki phase</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>finite temperature</value>
    </subject>
    <collection role="ddc" number="000">Informatik, Informationswissenschaft, allgemeine Werke</collection>
    <collection role="pacs" number="11.15.Ha">Lattice gauge theory (see also 12.38.Gc Lattice QCD calculations)</collection>
    <collection role="pacs" number="12.38.Gc">Lattice QCD calculations (see also 11.15.Ha Lattice gauge theory)</collection>
    <collection role="institutes" number="">ZIB Allgemein</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/881/ZR-05-48.pdf</file>
    <file>https://opus4.kobv.de/opus4-zib/files/881/ZR-05-48.ps</file>
  </doc>
  <doc>
    <id>749</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
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    <edition/>
    <issue/>
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    <type>reportzib</type>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2003-08-28</completedDate>
    <publishedDate>2003-08-28</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A numerical reinvestigation of the Aoki phase with $N_f=2$ Wilson fermions at zero temperature</title>
    <abstract language="eng">We report on a numerical reinvestigation of the Aoki phase in lattice QCD with two flavors of Wilson fermions where the parity-flavor symmetry is spontaneously broken. For this purpose the Hybrid Monte Carlo algorithm was used and an explicit symmetry-breaking source term $h\bar{\psi} i \gamma_{5} \tau^{3}\psi$ was added to the Wilson fermion action. The order parameter $\langle\bar{\psi}i\gamma_{5}\tau^{3}\psi\rangle$ was studied at several values of $(\beta,\kappa,h)$ on lattices of sizes $4^4$ to $12^4$. Our largest lattices can be considered as infintely large allowing to extrapolate to $h=0$. The existence of a parity-flavor-breaking phase can be confirmed at $\beta=4.0$ and $\beta=4.3$ while we find no sign of parity-flavor-breaking at $\beta=4.6$ and $\beta=5.0$.</abstract>
    <identifier type="serial">03-27</identifier>
    <identifier type="opus3-id">750</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-7492</identifier>
    <enrichment key="SourceTitle">Appeared in: Phys. Rev. D69 (2004) 074511</enrichment>
    <author>Ernst-Michael Ilgenfritz</author>
    <author>Werner Kerler</author>
    <author>Michael Müller-Preussker</author>
    <author>André Sternbeck</author>
    <author>Hinnerk Stüben</author>
    <series>
      <title>ZIB-Report</title>
      <number>03-27</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Wilson fermions</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>phase diagram</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>parity-flavor symmetry</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Aoki phase</value>
    </subject>
    <collection role="ddc" number="000">Informatik, Informationswissenschaft, allgemeine Werke</collection>
    <collection role="institutes" number="">ZIB Allgemein</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/749/ZR-03-27.ps</file>
    <file>https://opus4.kobv.de/opus4-zib/files/749/ZR-03-27.pdf</file>
  </doc>
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