Matter in Extreme Conditions
Lead Research Organisation:
Plymouth University
Department Name: Sch of Computing & Mathematics
Abstract
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Publications
Langfeld K
(2010)
A fresh look at the confinement mechanism
Langfeld K
(2011)
Yang-Mills streamlines and semi-classical confinement
Langfeld K
(2012)
From confinement to new states of dense matter in quantum chromodynamics
in Progress in Particle and Nuclear Physics
Langfeld K
(2012)
Density of states in gauge theories.
in Physical review letters
Langfeld K
(2013)
Phase diagram of the quantum O ( 2 ) model in 2 + 1 dimensions
in Physical Review D
Langfeld K
(2013)
Two-color QCD with heavy quarks at finite densities
in Physical Review D
Greensite J
(2013)
Effective Polyakov line action from the relative weights method
in Physical Review D
Bowman P
(2011)
Role of center vortices in chiral symmetry breaking in SU(3) gauge theory
in Physical Review D
Greensite J
(2013)
Effective Polyakov line action from strong lattice couplings to the deconfinement transition
in Physical Review D
Langfeld K
(2010)
Confinement and the quark Fermi surface in SU ( 2 N ) QCD-like theories
in Physical Review D
| Description | The research has addressed one of the outstanding issues in particle physics: the properties of matter at low temperatures and finite densities. Lattice gauge theories have been for many decades providing first principle results from the QCD, the theory of strong interactions. Since standard Monte-Carlo simulations of the these theories are impossible at finite densities due to the notorious sign problem, other approaches must come into play. We were abel to address this issue: - by deriving an effective theory for the Polykov line that can be generalised to finite densities in an exact way. It is expected that the simulation of this theory should be less afflicted by the sign problem. - by revealing effective degrees of freedom, the streamline configurations, that are linked to the property of colour confinement. At 2-5 nuclear matter densities, QCD is believed to udnergo a de-confinement transition. Hence, streamkine configuations are expected to paly a major role at these densities. - by developping a new powerfull approach, the density-of-states method, which might provide a generic and practical solution of the sign problems at densities taht are highly rekevant for phenomenology (e.g. physics of compact stars). This has led to further developments (see below). |
| Exploitation Route | The density-of-states method has already been generalised and successfully applied to address Quantum Fields Theories with a sign problem. This follow-up research is funded by STFC under "New Ideas fro Gauge Fields and Strings" (ST/L000350/1). |
| Sectors | Digital/Communication/Information Technologies (including Software),Education,Other |
| Description | The award made it possible to install a tightly coupled HPC facility at Plymouth University (DiRAC framework). The installation became part of a HPC centre with additional hardware, funded by the Fcaulty and other fundin bodies, and, amog others, supporting rsearch in teh Marine Sciences. After the end of the award, the cluster is still maintained by the University. It still underpins Particle Physics research, helps to train stundents and professional in HPC adminsitartion and OS and facilitates student training at all levels in HPC simulations. |
| First Year Of Impact | 2011 |
| Sector | Education |
| Impact Types | Societal,Policy & public services |
| Description | Laser_umea |
| Organisation | Umea University |
| Department | Department of Physics |
| Country | Sweden |
| Sector | Academic/University |
| PI Contribution | Scientific collaboration, discussions, publications |
| Collaborator Contribution | scientific collaboration, publications |
| Impact | Publications, visits |
| Start Year | 2009 |
| Description | QFT_Jena |
| Organisation | Friedrich Schiller University Jena (FSU) |
| Department | Theoretical - Institute of Physics |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | discussions, seminars |
| Collaborator Contribution | Scientific collaboration; |
| Impact | two publications in peer reviewed journals |
| Start Year | 2008 |
| Description | HPC_Teach |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | Local |
| Primary Audience | Professional Practitioners |
| Results and Impact | Undergraduate and PhD HPC training, dissemination of HPC skills across research groups of the Faculty. dissemination of HPC skills |
| Year(s) Of Engagement Activity | 2010,2011,2012,2013,2014,2015,2016 |