On The Existence of a Holographic Description of the LHC Quark-Gluon Plasmas

TL;DR

This paper investigates whether a holographic model can describe the extreme quark-gluon plasmas produced in LHC heavy-ion collisions, considering additional bulk effects, and concludes that such a description remains uncertain.

Contribution

The study introduces a bulk dilatonic field model to assess if lower-order effects resolve holographic description issues for LHC plasmas, finding it unlikely.

Findings

Bulk dilaton field does not resolve holographic description problems.

Holographic models for LHC plasmas remain uncertain.

Peripheral LHC collisions challenge existing holographic approaches.

Abstract

Peripheral collisions of heavy ions can give rise to extremely intense magnetic fields. It has been suggested that these fields might invalidate the holographic description of the corresponding quark-gluon plasmas, assuming that these can be modelled by strongly coupled field theories. In the case of the plasmas produced in collisions at the RHIC facility (including in the beam energy scans), it is known how to deal with this problem: one has to take into account the large angular momenta generated in these plasmas, and the effects of the baryonic chemical potential. But this does not work for the plasmas produced in peripheral collisions at the LHC. However, these results neglect some (less significant) aspects of bulk physics; could it be that the problem is resolved by taking into account these lower-order effects? Here we use a bulk dilatonic field (fully compatible with boundary data, as well as with the asymptotically AdS character of the bulk geometry) as a model of these effects, and show that this is unlikely to be the solution. Thus, the existence of a consistent holographic description of the most extreme LHC plasmas remains open to question.