The QCD phase diagram for small densities from imaginary chemical potential
Abstract
We present results on the QCD phase diagram for μ_{B}⩽ πT. Our simulations are performed with an imaginary chemical potential μ= iμ_{I} for which the fermion determinant is positive. On an 8 ^{3}×4 lattice with 2 flavors of staggered quarks, we map out the phase diagram and identify the (pseudo) critical temperature T_{c}( μ_{I}). For μ_{I}/ T⩽ π/3, this is an analytic function, whose Taylor expansion is found to converge rapidly, with truncation errors far smaller than statistical ones. The truncated series may then be continued to real μ, yielding the corresponding phase diagram for μ_{B}≲500 MeV. This approach provides control over systematics and avoids reweighting. We compare it with other recent work.
 Publication:

Nuclear Physics B
 Pub Date:
 October 2002
 DOI:
 10.1016/S05503213(02)006260
 arXiv:
 arXiv:heplat/0205016
 Bibcode:
 2002NuPhB.642..290D
 Keywords:

 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 21 pages, 10 figures