Lattice constraints on the thermal photon rate

Ghiglieri, Jacopo; Kaczmarek, O.; Laine, Mikko Sakari; Meyer, F. (2016). Lattice constraints on the thermal photon rate. Physical review. D - particles, fields, gravitation, and cosmology, 94(1), 016005. American Physical Society 10.1103/PhysRevD.94.016005

[img] Text
PhysRevD.94.016005.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (442kB) | Request a copy
[img]
Preview
Text
1604.07544v2.pdf - Submitted Version
Available under License Publisher holds Copyright.

Download (311kB) | Preview

We estimate the photon production rate from an SU(3) plasma at temperatures of about 1.1Tc and 1.3Tc. Lattice results for the vector current correlator at spatial momenta k∼(2−6)T are extrapolated to the continuum limit and analyzed with the help of a polynomial interpolation for the corresponding spectral function, which vanishes at zero frequency and matches to high-precision perturbative results at large invariant masses. For small invariant masses the interpolation is compared with the next-to-leading-order (NLO) weak-coupling result, hydrodynamics, and a holographic model. At vanishing invariant mass we extract the photon rate which for k≳3T is found to be close to the NLO weak-coupling prediction. For k≲2T uncertainties remain large but the photon rate is likely to fall below the NLO prediction, in accordance with the onset of a strongly interacting behavior characteristic of the hydrodynamic regime.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ghiglieri, Jacopo and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

22 Aug 2016 11:08

Last Modified:

22 Aug 2016 11:08

Publisher DOI:

10.1103/PhysRevD.94.016005

ArXiv ID:

1604.07544

BORIS DOI:

10.7892/boris.86112

URI:

https://boris.unibe.ch/id/eprint/86112

Actions (login required)

Edit item Edit item
Provide Feedback