Matthew Cummins
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Matthew Cummins has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Dale Lawlor
Maynooth University–National University of Ireland Maynooth
1 shared publication - Derek B. Leinweber
Adelaide University
1 shared publication - Ian van Schalkwyk
Adelaide University
1 shared publication - Jon-Ivar Skullerud
National University of Ireland Maynooth
1 shared publication - Ragib F. Hasan
Adelaide University
1 shared publication - Waseem Kamleh
University of Adelaide
1 shared publication
Latest Publications
- Open Access
- 5 November 2026
- Published by American Physical Society (APS) in Physical Review D
- Vol. 114 (9)
Structure of QC 2 D ground state fields at nonzero matter densities
A quantitative investigation into the modification of ground-state field structures in two-color QCD ( QC 2 D ) is presented at finite chemical potential. Using lattice simulations with Wilson gauge and fermion actions, we explore the chromo-electromagnetic field strengths under varying matter densities. To ensure accurate measurements, we develop and calibrate two highly improved topological charge operators and evaluate four gradient flow actions. Our results reveal a finite-volume crossover in the regime of the anticipated phase boundary at μ = m π / 2 , with both chromoelectric and chromomagnetic field strengths suppressed before recovering and exceeding vacuum values at higher chemical potentials. We find the difference between the squared chromoelectric and chromomagnetic field strengths, E 2 − B 2 , to increase in magnitude monotonically with increasing chemical potential. At a μ = 0.7 , we find an 11% suppression of E 2 , a relatively small effect. A systematic analysis using sigmoid fits of lattice simulations in the crossover regime is performed to confirm the critical chemical potential obtained from the field structure is in agreement with the phase boundary at m π / 2 . These findings provide new insight into non-Abelian ground-state vacuum field structures and offer a foundation for future studies in real QCD.
- 5 November 2026
- Published by American Physical Society (APS) in Physical Review D
- Vol. 114 (9)
Open AccessStructure of QC 2 D ground state fields at nonzero matter densities
A quantitative investigation into the modification of ground-state field structures in two-color QCD ( QC 2 D ) is presented at finite chemical potential. Using lattice simulations with Wilson gauge and fermion actions, we explore the chromo-electromagnetic field strengths under varying matter densities. To ensure accurate measurements, we develop and calibrate two highly improved topological charge operators and evaluate four gradient flow actions. Our results reveal a finite-volume crossover in the regime of the anticipated phase boundary at μ = m π / 2 , with both chromoelectric and chromomagnetic field strengths suppressed before recovering and exceeding vacuum values at higher chemical potentials. We find the difference between the squared chromoelectric and chromomagnetic field strengths, E 2 − B 2 , to increase in magnitude monotonically with increasing chemical potential. At a μ = 0.7 , we find an 11% suppression of E 2 , a relatively small effect. A systematic analysis using sigmoid fits of lattice simulations in the crossover regime is performed to confirm the critical chemical potential obtained from the field structure is in agreement with the phase boundary at m π / 2 . These findings provide new insight into non-Abelian ground-state vacuum field structures and offer a foundation for future studies in real QCD.