Cutoff effects in lattice actions at mu not equal 0
2011
6 pages
Published in:
- Indian J.Phys. 85 (2011) 129-134
Contribution to:
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Abstract: (Springer)
We look at the cutoff dependence of several lattice actions, including two improved actions viz. Naik and p4, and and chirally-invariant ones, namely fixed-point, overlap and domain-wall, with the aim of understanding its behavior at µ ≠ 0. Apart from numerical results, we also derive a series expansion in N for the free-gas pressure. We find that actions with O(a )-improved rotational invariance produce O(a )-improvement in the pressure. The series for unimproved overlap and domain-wall fermions are identical to the naive series, and hence using Naik or p 4 kernels should produce improvement in these formulations as well. Lastly, we find that actions that are improved at µ = 0 remain so as the chemical potential is turned on. The series coefficients become µ-dependent now, however their functional form at any given order is the same for all actions.- Lattice QCD
- quantum chorodynamics
- 12.38.Gc
- 25.75.Nq
- 11.15.Ha
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