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arxiv: 2606.26598 · v1 · pith:CM22A6XBnew · submitted 2026-06-25 · ✦ hep-ph

Holographic light-quark energy loss in a spinning plasma

Pith reviewed 2026-06-26 04:42 UTC · model grok-4.3

classification ✦ hep-ph
keywords holographic dualitylight quark energy lossspinning plasmaMyers-Perry geometryjet quenchinganisotropic energy lossstopping distancerotating black brane
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The pith

In a holographic model of spinning plasma, light quarks lose energy faster and stop sooner when moving perpendicular to the rotation axis.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper studies light-quark energy loss inside a strongly coupled plasma that rotates or carries a boost, modeled by a spinning black-brane geometry. It tracks how far a light quark travels before it stops and how much energy it sheds at each instant, comparing motion along the rotation axis to motion across it. Two string-based probes are used to extract these quantities at different temperatures and rotation strengths. The calculations show that raising temperature or the rotation parameter shortens the stopping distance and raises the instantaneous loss rate, with the rotation effect stronger in the transverse direction. This produces a clear directional dependence in the energy-loss pattern.

Core claim

In the large-black-hole limit of the Myers-Perry geometry, which supplies the holographic dual of a spinning or boosted strongly coupled fluid, both the falling-string and shooting-string prescriptions show that increasing temperature or the parameter a shortens the stopping distance of a light quark and increases its instantaneous energy loss. The reduction in stopping distance is larger for motion transverse to the rotation axis than for motion parallel to it, yielding an anisotropic energy-loss pattern. The same trends appear for both string probes and match earlier holographic results on jet quenching and heavy-quark motion in rotating plasmas.

What carries the argument

Spinning black-brane background from the large-black-hole limit of Myers-Perry geometry, probed by falling-string and shooting-string configurations.

If this is right

  • Energy loss becomes direction-dependent, stronger transverse to the rotation axis than along it.
  • Both stopping distance and instantaneous loss rate decrease with rising temperature at fixed rotation.
  • The anisotropy grows with the rotation parameter a, producing a measurable directional preference in quenching.
  • The pattern is reproduced by two independent string probes, increasing in the anisotropy result.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The directional preference could alter the shape of jets produced in non-central heavy-ion collisions where the plasma carries angular momentum.
  • Similar calculations could be repeated for other probes such as heavy quarks or gluons to map the full anisotropy of the rotating medium.
  • If the anisotropy survives in more realistic holographic models, hydrodynamic simulations of rotating quark-gluon plasma would need to incorporate direction-dependent energy-loss terms.

Load-bearing premise

The large-black-hole limit of the Myers-Perry geometry supplies a reliable dual description of a spinning strongly coupled fluid and the chosen string configurations correctly capture light-quark dynamics inside it.

What would settle it

A direct computation in the same background that shows the stopping distance increasing or staying constant with rising a, or experimental data from a rotating plasma showing equal energy loss in all directions, would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.26598 by Yan-qing Zhao, Zhou-Run Zhu.

Figure 1
Figure 1. Figure 1: shows the stopping distance of a light quark as a function of temperature T for different values of the boost parameter a. For any fixed a, the stopping distance monoton￾ically decreases with increasing T, indicating that a hotter medium causes a faster energy loss. At a given temperature, increasing a also reduces the stopping distance. Recalling that the angular velocity of the dual rotating fluid is Ω =… view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Instantaneous energy loss [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
read the original abstract

In this work, we investigate light-quark energy loss in a strongly coupled plasma described by a spinning black-brane background obtained from the large-black-hole limit of the Myers--Perry geometry. The parameter $a$ characterizes the boost/rotation of the dual fluid in this holographic setup and is related to the angular velocity in the corresponding limit. We employ two complementary probes, the falling-string and shooting-string descriptions, to compute the stopping distance and the instantaneous energy loss of a light quark moving either transverse or parallel to the rotation axis. We find that increasing the temperature or the parameter $a$ reduces the stopping distance and enhances the instantaneous energy loss. The effect of $a$ is more pronounced for transverse motion than for motion along the rotation axis, indicating an anisotropic energy-loss pattern induced by the spinning/boosted background. These results are consistent with earlier holographic studies of jet quenching and heavy-quark dynamics in rotating plasmas.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 1 minor

Summary. The manuscript investigates light-quark energy loss in a strongly coupled spinning plasma using the large-black-hole limit of the Myers-Perry geometry as the holographic dual. It applies the falling-string and shooting-string prescriptions to compute stopping distances and instantaneous energy loss for light quarks moving parallel or transverse to the rotation axis, parameterized by the boost/rotation parameter a. The central results are that increasing temperature or a reduces the stopping distance and increases instantaneous energy loss, with the effect of a being stronger for transverse motion, producing an anisotropic pattern; these findings are stated to be consistent with prior holographic jet-quenching studies.

Significance. If the calculations are correct, the work provides a concrete holographic prediction for anisotropic light-quark energy loss in rotating plasmas, extending standard string-probe methods to the spinning Myers-Perry background. This could be relevant for modeling jet quenching in heavy-ion collisions carrying angular momentum. The approach relies on established techniques in the field without introducing new free parameters beyond a and temperature.

minor comments (1)
  1. [Abstract] Abstract: the relation between the parameter a and the angular velocity of the dual fluid is mentioned but not quantified; a brief statement of the coordinate frame or the explicit form of the metric in the large-black-hole limit would improve readability for readers unfamiliar with the Myers-Perry reduction.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript and for recommending acceptance.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The derivation applies the standard falling-string and shooting-string equations to the large-black-hole limit of the Myers-Perry metric. Stopping distance and instantaneous energy loss are obtained by integrating the Nambu-Goto action and solving the resulting differential equations in the given background; these quantities are not defined in terms of themselves or fitted to the target observables. The anisotropy is a direct geometric consequence of the boosted/rotating metric components and does not rely on self-citation for its justification. The abstract's consistency statement with earlier holographic studies is observational and not used as a load-bearing premise. No self-definitional, fitted-input, or ansatz-smuggling steps appear in the reported chain.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claim rests on the applicability of holographic duality to this system and on the specific choice of the spinning black-brane background; no independent evidence for these modeling choices is supplied in the abstract.

free parameters (2)
  • a
    Rotation/boost parameter of the Myers-Perry black brane; its value controls the anisotropy and is varied to obtain the reported trends.
  • temperature
    Temperature of the dual plasma; varied together with a to extract the dependence of stopping distance and energy loss.
axioms (2)
  • domain assumption Holographic duality maps the strongly coupled spinning plasma to the large-black-hole limit of the Myers-Perry geometry.
    Invoked to justify the background used for the string probes.
  • domain assumption Falling-string and shooting-string prescriptions correctly model light-quark energy loss.
    Standard but unproven assumption in holographic jet-quenching calculations.

pith-pipeline@v0.9.1-grok · 5683 in / 1376 out tokens · 33676 ms · 2026-06-26T04:42:39.396785+00:00 · methodology

discussion (0)

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