Here is a list of submissions we have gotten so far for the Change My Mind and Anonymous Questions survey. The list will be updated regularly.
Submissions are still open under the Surveys tab in the menu. (The two surveys are identical. There is a second one in case you submit a response to the first one but still have more to say/ask).
#1
In general: what is exactly the link between the asymptotic freedom and the reality of our measurements on "quark gluon plasma" Is the "liquid" contrary to the asymptotic freedom?
What kind of plasma do we believe was present at the beginning of the Universe. did a phase transition happened from perturbative to sQGP?
#2
When a QGP turns into hadrons, how is it guaranteed that colour is preserved locally? Can one not have artefacts of widely separated quarks that have to find together? Is it understood what happens then, and what (observable) consequences it has?
#3
Change my mind: The quenching of jets (or, equivalently, pT broadening) is not the only signature of the QGP at high-pT.
#4
Small systems should be investigated by models with both equilibrated and non-equilibrated components
#5
Hadronisation, or say, the switch to hadronic degrees of freedom is overwhelmingly performed in a wrong, or say, incomplete, way. As the medium crosses over from QGP to an interacting garden gas, the hadronic degrees of freedom are thermalised up to the switch. Therefore, to be consistent, thermal spectral functions MUST be used.
#6
Is most of what we have observed as jet quenching simply consequence of imperfect background subtraction (ie, unrelated to jet-QGP interaction)
#7
Are approaches based on Lund strings that reproduce some collective signatures more commonly attributed to QGP hydrodynamics simply an effective implementation of QGP dynamics (string repulsion and recombination are an effective implementation of hydrodynamics)
#8
Are we currently aware of QGP exclusive signals in observables?
#9
Are overlapping strings not an alternative to the QGP, but a different way of describing the same thing?
#10
Currently, there are no competitive alternatives to hydrodynamic-based models to provide simultaneous *multi-observable* predictions in good agreement with experimental data for large systems, and, possibly small systems.
#11
Studying jets is of high interest, and often said it carries the information of the system produced. But if one thinks of ~10 GeV or more jets, then it should be decoupled from the system even when the system starts forming. Then how does it contain information about the medium, about quenching and other studies?
#12
All the quantum numbers have to be conserved! Is there any sequence or ordering how they should be conserved? Like charge, baryon , strangeness , isospin, etc. In particular manner or at once. How to ensure these via a study?
#13
Why do we still need to measure inclusive jet observables in AA and compare to pp?
#14
What is special about head-on small system collisions that one cannot due using peripheral large system collisions?
#15
If we do find evidence of jet quenching in high multiplicity pp, does that mean
a) we dont know what characterizes the QGP or
b) there is QGP in pp
c) is everything basically QGP? - its just multiplicity and larger the number, the larger the interactions?
#16
Is there a hadronization end-game? like given infinite resources, person-power, computer power - is the end goal to find a deterministic solution to hadronization? is that even possible? if not, which i assume everyone would think so, why?
#17
What would be the smoking gun for the presence of a strongly-coupled fluid in heavy ions as opposed to, e.g., a gas of quarks and gluons in which they simply re-scatter with each other?
#18
In what sense is the QGP a continuous medium? Is it only an emergent behaviour from pointlike particles, or is materially continuous?
#19
What quantifiable QCD property has been extracted from heavy-ion data that we can agree to be sufficiently model-independent that we are 90% confident to be within the actual QCD value with specified uncertainties?
#20
Identified particle measurements are a hindrance, and we should focus on observables defined via QCD-conserved charges, e.g. energy flow.
#21
Is there a difference between gradient-driven expansion in string shoving and hydro models?
#22
What are known unknowns of hydrodynamic heavy-ion models? Can we look at the discrepancies between data and model and identify missing physics?
#23
Do we understand the intermediate momentum (2-8 GeV) light-particle flow and spectra?
#24
Do conformal QCD models, e.g. QCD kinetics, provide useful guidance to heavy-ion dynamics?
#25
The Lund people have added collectivity by introducing the notion of what happens when strings sit on top of each other… what is the difference of this with a, let’s say, 2+1D hadronic transport picture
#26
Can hydrodynamics fit almost any final data if initial and freeze-out are free?
#27
It is my understanding that the energy density of a Lund string and of a CGC string/hydrodynamics develops very differently. While the CGC strings and hydro decreases fast like ~1/tau, the energy density of a Lund string in the local rest frame is AFAIK constant (because the Lund string only expands at the ends).
My questions: is this correct? If yes, can one differentiate? And will it affect jet quenching differently, e.g., can one explain high pT elliptic flow easier with a constant energy density?
