Non-perturbative insights into the spectral properties of QCD at finite temperature

Lowdon, P.; Philipsen, Owe

doi:10.1051/epjconf/202227405013

Cited by 4 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is in accord with the approximately chiral-spin symmetric window consisting of non-perturbative, hadron-like excitations. Finally, as a further test of the generality of the thermoparticle approach for moderate temperatures of the order of particle masses, equally successful descriptions are achieved for the QCD pseudoscalars involving strange quarks [33] as well as for the dynamically completely different φ 4 -theory [34].…”

Section: Pos(europlex2023)021mentioning

confidence: 99%

Surprises on the way to the QCD phase diagram

Philipsen

2024

Proceedings of European Network for Particle Physics, Lattice Field Theory and Extreme Computing — PoS(EuroPLEx2023)

View full text Add to dashboard Cite

Section: Pos(europlex2023)021mentioning

confidence: 99%

Surprises on the way to the QCD phase diagram

Philipsen

2024

Proceedings of European Network for Particle Physics, Lattice Field Theory and Extreme Computing — PoS(EuroPLEx2023)

View full text Add to dashboard Cite

“…As outlined in refs. [30][31][32][33][34] and summarised recently [42], there are several well-motivated reasons for why thermoparticle components D m,β (⃗ x) δ(s − m 2 ) provide a natural description for particle-like states at finite temperature. Perhaps the most compelling is that due to the representation in eq.…”

Section: Thermoparticlesmentioning

confidence: 99%

Pseudo-scalar meson spectral properties in the chiral crossover region of QCD

Bala,

Kaczmarek,

Lowdon

et al. 2024

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

Determining the type of excitations that can exist in a thermal medium is key to understanding how hadronic matter behaves at extreme temperatures. In this work we study this question for pseudo-scalar mesons comprised of light-strange and strange-strange quarks, analysing how their low-energy spectral properties are modified as one passes through the high-temperature chiral crossover region between T = 145.6 MeV and 172.3 MeV. We utilise the non-perturbative constraints satisfied by correlation functions at finite temperature in order to extract the low-energy meson spectral function contributions from spatial correlator lattice data in Nf = 2 + 1 flavour QCD. The robustness of these contributions are tested by comparing their predictions with data for the corresponding temporal correlator at different momentum values. We find that around the pseudo-critical temperature Tpc the data in both the light-strange and strange-strange channels is consistent with the presence of a distinct stable particle-like ground state component, a so-called thermoparticle excitation. As the temperature increases this excitation undergoes collisional broadening, and this is qualitatively the same in both channels. These findings suggest that pseudo-scalar mesons in QCD have a bound-state-like structure at low energies within the chiral crossover region which is still strongly influenced by the vacuum states of the theory.

show abstract

On the (in)consistency of perturbation theory at finite temperature

Lowdon,

Philipsen

2024

J. High Energ. Phys.

View full text Add to dashboard Cite

A well-known difficulty of perturbative approaches to quantum field theory at finite temperature is the necessity to address theoretical constraints that are not present in the vacuum theory. In this work, we use lattice simulations of scalar correlation functions in massive ϕ 4 theory to analyse the extent to which these constraints affect the perturbative predictions. We find that the standard perturbative predictions deteriorate even in the absence of infrared divergences at relatively low temperatures, and that this is directly connected to the analytic structure of the propagators used in the expansion. This suggests that the incorporation of non-perturbative thermal effects in the propagators is essential for a consistent perturbative formulation of scalar quantum field theories at finite temperature. By utilising the spectral constraints imposed on finite-temperature correlation functions, we explore how these effects manifest themselves in the lattice data, and discuss why the presence of distinct thermoparticle excitations provides a potential resolution to these issues.

show abstract

Non-perturbative insights into the spectral properties of QCD at finite temperature

Cited by 4 publications

References 29 publications

Surprises on the way to the QCD phase diagram

Surprises on the way to the QCD phase diagram

Pseudo-scalar meson spectral properties in the chiral crossover region of QCD

On the (in)consistency of perturbation theory at finite temperature

Contact Info

Product

Resources

About