Giorgio Torrieri
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View article: Gaussian generally covariant hydrodynamics
Gaussian generally covariant hydrodynamics Open
We develop a version of fluctuating relativistic hydrodynamics in a way very different from the usual derivation: Instead of treating it as a coarse-grained deterministic theory expanded in gradients of equilibrium quantities, we treat it …
View article: Event-by-event vortex rings in fixed-target p+Ar collisions
Event-by-event vortex rings in fixed-target p+Ar collisions Open
We present event-by-event simulations for central asymmetric p+Ar collisions at $\sqrt{s_\mathrm{NN}} = 68$ GeV to investigate the formation and evolution of vortex-ring structures from the early-stage longitudinal flow velocity profile. O…
View article: Probing the onset of collectivity via scaled particle spectra in ultrarelativistic nuclear collisions
Probing the onset of collectivity via scaled particle spectra in ultrarelativistic nuclear collisions Open
We identify a novel scaling in the transverse momentum spectra of produced particles, obtained by removing the global scales of multiplicity and mean transverse momentum. Hydrodynamic simulations and experimental data reveal an almost univ…
View article: Meson spin alignment and baryon polarization from coalescence with spin-vorticity nonequilibrium
Meson spin alignment and baryon polarization from coalescence with spin-vorticity nonequilibrium Open
We estimate both the polarization of spin 1/2 baryons and the spin density matrix coefficients of spin 1 mesons using a thermal model that incorporates vorticity and polarization to describe quarks, along with a coalescence formalism where…
View article: Chiral oscillations in finite time quantum field theory
Chiral oscillations in finite time quantum field theory Open
We demonstrate how chiral oscillations of a massive Dirac field can be described within quantum field theory using a finite-time interaction picture approach, where the mass term in the Lagrangian is treated as a perturbative coupling betw…
View article: Gaussian generally covariant hydrodynamics
Gaussian generally covariant hydrodynamics Open
We develop a version of fluctuating relativistic hydrodynamics in a way very different from the usual derivation: Instead of treating it as a coarse-grained deterministic theory expanded in gradients of equilibrium quantities, we treat it …
View article: Chiral oscillations in finite time quantum field theory
Chiral oscillations in finite time quantum field theory Open
We demonstrate how chiral oscillations of a massive Dirac field can be described within quantum field theory using a finite-time interaction picture approach, where the mass term in the Lagrangian is treated as a perturbative coupling betw…
View article: Vortex rings in event-by-event relativistic heavy-ion collisions
Vortex rings in event-by-event relativistic heavy-ion collisions Open
We present event-by-event simulations for central asymmetric light+heavy and Au +Au collisions to investigate the formation and evolution of vortex-ring structures in the longitudinal flow velocity profile. The production-plane polarizatio…
View article: Meson spin alignment and baryon polarization from coalescence with spin-vorticity non-equilibrium
Meson spin alignment and baryon polarization from coalescence with spin-vorticity non-equilibrium Open
We estimate both the polarization of spin $1/2$ baryons and the spin density matrix coefficients of spin $1$ mesons using a thermal model that incorporates vorticity and polarization to describe quarks, along with a coalescence formalism w…
View article: Linearized fluctuating hydrodynamics via random polynomials
Linearized fluctuating hydrodynamics via random polynomials Open
We argue that an ensemble of backgrounds best describes hydrodynamic dispersion relations in a medium with few degrees of freedom and is therefore subject to strong thermal fluctuations. In the linearized regime, dispersion relations becom…
View article: Linearized fluctuating hydrodynamics via random polynomials
Linearized fluctuating hydrodynamics via random polynomials Open
We argue that an ensemble of backgrounds best understands hydrodynamic dispersion relations in a medium with few degrees of freedom and is therefore subject to strong thermal fluctuations. In the linearized regime, dispersion relations bec…
View article: Quantum field theory at finite time and neutrino oscillations
Quantum field theory at finite time and neutrino oscillations Open
We discuss the role of finite time and energy uncertainty in the quantum field theory description of neutrino oscillations. In order to to achieve this goal, we review the flavor Fock-space approach and the time-energy uncertainty relation…
View article: Vortex Rings in Event-by-Event Relativistic Heavy-Ion Collisions
Vortex Rings in Event-by-Event Relativistic Heavy-Ion Collisions Open
We present event-by-event simulations for central asymmetric light+heavy and Au+Au collisions to investigate the formation and evolution of vortex-ring structures in the longitudinal flow velocity profile. The production-plane polarization…
View article: Universality of scaled particle spectra in ultrarelativistic heavy-ion collisions
Universality of scaled particle spectra in ultrarelativistic heavy-ion collisions Open
We propose a new observable derived from a centrality-dependent scaling of transverse particle spectra. By removing the global scales of total particle number and mean transverse momentum, we isolate the shape of the spectrum. In hydrodyna…
View article: The Hanbury-Brown and Twiss effect in inflationary cosmological perturbations
The Hanbury-Brown and Twiss effect in inflationary cosmological perturbations Open
The simplest model of inflation is based around an inflaton field that starts in a coherent false vacuum state with a positive cosmological constant, rolls slowly to the true vacuum and relaxes to it via reheating. We examine whether the s…
View article: What is "quantum" about quantum gravity?
What is "quantum" about quantum gravity? Open
Assuming the validity of the equivalence principle in the quantum regime, we argue that one of the assumptions of the usual definition of quantum mechanics, namely separation between the ``classical'' detector and the ``quantum'' system, m…
View article: Emergent symmetries of relativistic fluid dynamics from local ergodicity
Emergent symmetries of relativistic fluid dynamics from local ergodicity Open
We show that volume-preserving diffeomorphisms and the chemical shift symmetry defining relativistic Lagrangian ideal fluid dynamics can be derived as an emerging symmetry when ergodicity is assumed to apply locally in a way that is invari…
View article: The functional generalization of the Boltzmann-Vlasov equation and its gauge-like symmetry
The functional generalization of the Boltzmann-Vlasov equation and its gauge-like symmetry Open
We argue that one can model deviations from the ensemble average in non-equilibrium statistical mechanics by promoting the Boltzmann equation to an equation in terms of functionals , representing possible candidates for phase space distrib…
View article: Report on scipost_202401_00013v1
Report on scipost_202401_00013v1 Open
We argue that one can model deviations from the ensemble average in nonequilibrium statistical mechanics by promoting the Boltzmann equation to an equation in terms of functionals , representing possible candidates for phase space distribu…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math> polarization from vortex rings as the medium response for jet thermalization
polarization from vortex rings as the medium response for jet thermalization Open
We performed a systematic study on the formation of vorticity rings as the process for jet thermalization in the medium created in high-energy nuclear collisions. In this work, we expanded our previous analysis to a more realistic framewor…
View article: Report on 2309.05154v1
Report on 2309.05154v1 Open
We argue that one can model deviations from the ensemble average in nonequilibrium statistical mechanics by promoting the Boltzmann equation to an equation in terms of functionals , representing possible candidates for phase space distribu…
View article: Report on 2309.05154v1
Report on 2309.05154v1 Open
We argue that one can model deviations from the ensemble average in nonequilibrium statistical mechanics by promoting the Boltzmann equation to an equation in terms of functionals , representing possible candidates for phase space distribu…
View article: Quarkonium spin alignment in a vortical medium
Quarkonium spin alignment in a vortical medium Open
We use a potential model to investigate the phenomenology of quarkonium in a thermal rotating medium, where vorticity and spin density are not necessarily in equilibrium. We find that the quarkonium spin density matrix, as well as the bind…
View article: Neutrino oscillations in the interaction picture
Neutrino oscillations in the interaction picture Open
We study the mixing of different kind of fields (scalar in 0+1D, scalar in 3+1D, fermion in 3+1D) treating the mixing term as an interaction. To this aim, we employ the usual perturbative series in the interaction picture. We find that exp…
View article: Emergent symmetries of relativistic fluid dynamics from local ergodicity
Emergent symmetries of relativistic fluid dynamics from local ergodicity Open
We show that volume-preserving diffomorphisms and the chemical shift symmetry defining relativistic lagrangian ideal fluid dynamics can be derived as an emerging symmetry when ergodicity is assumed to apply locally in a way that is invaria…
View article: Neutrino oscillations in the interaction picture
Neutrino oscillations in the interaction picture Open
We study the mixing of different kind of fields (scalar in 0+1D, scalar in 3+1D, fermion in 3+1D) treating the mixing term as an interaction. To this aim, we employ the usual perturbative series in the interaction picture. We find that exp…
View article: Quarkonium spin alignment in a vortical medium
Quarkonium spin alignment in a vortical medium Open
We use a potential model to investigate the phenomenology of quarkonium in a thermal rotating medium, where vorticity and spin density are not necessarily in equilibrium. We find that the quarkonium spin density matrix, as well as the bind…
View article: $Λ$ polarization from vortex ring as medium response for jet thermalization
$Λ$ polarization from vortex ring as medium response for jet thermalization Open
We performed a systematic study on the formation of vorticity rings as the process for jet thermalization in the medium created in high-energy nuclear collisions. In this work, we expanded our previous analysis to a more realistic framewor…
View article: Linear response hydrodynamics of a relativistic dissipative fluid with spin
Linear response hydrodynamics of a relativistic dissipative fluid with spin Open
We formulate a Lagrangian hydrodynamics including shear and bulk viscosity in the presence of spin density, and investigate it using the linear response functional formalism. The result is a careful accounting of all sound and vortex inter…