Thermal photon production in Gubser inviscid relativistic fluid dynamics

Journal Article · 25 December 2023 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.108.064912 · OSTI ID:2350953

Paquet, Jean-François  ^[1]

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1. Vanderbilt University, Nashville, TN (United States); Vanderbilt University

The Gubser solution to inviscid relativistic fluid dynamics is used to examine the role of transverse expansion on the energy spectrum of photons radiated by quark-gluon plasma. Transverse flow is shown to be a modest effect on the energy spectrum of photons as a whole, despite its large effect on rare high-energy photons produced at low temperatures. An exact expression is derived for the volume of the plasma as a function of its temperature. Furthermore, a simple formula is obtained for the energy spectrum of high-energy thermal photons, which is used to relate the inverse slope T_eff of the photon spectrum at energy E to the maximum temperature of the plasma T₀, finding T_eff ≈ T₀/ (1 + $$\frac{5}{2}$$ T₀/E).

• Research Organization: Vanderbilt University, Nashville, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0024347
• OSTI ID: 2350953
• Journal Information: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 108; ISSN 2469-9985
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English