Mikhail Stephanov
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View article: Factorial cumulants of proton multiplicity near a critical point using maximum entropy freeze-out prescription
Factorial cumulants of proton multiplicity near a critical point using maximum entropy freeze-out prescription Open
We present the first application of the maximum-entropy freeze-out prescription to calculate factorial cumulants of proton multiplicities near the conjectured QCD critical point in thermal equilibrium. We map the Gibbs free energy of the 3…
View article: Enhancement of photon emission rate near QCD critical point
Enhancement of photon emission rate near QCD critical point Open
We compute photon emission rate enhancement near the QCD critical point using an effective theory of dynamic critical phenomena and derive a universal photon spectrum. The emission rate scales similarly to conductivity, increasing with the…
View article: Equilibrium expectations for non-Gaussian fluctuations near a QCD critical point
Equilibrium expectations for non-Gaussian fluctuations near a QCD critical point Open
With the highly anticipated results from the Beam Energy Scan II program at RHIC being recently revealed, an understanding of particle-number fluctuations and their significance as a potential signature of a possible QCD critical point is …
View article: Schwinger-Keldysh effective action for hydrodynamics with approximate symmetries
Schwinger-Keldysh effective action for hydrodynamics with approximate symmetries Open
We study the hydrodynamic theories with approximate symmetries in the recently developed effective action approach on the Schwinger-Keldysh (SK) contour. We employ the method of spurious symmetry transformation for small explicit symmetry-…
View article: QCD critical point: recent developments
QCD critical point: recent developments Open
Recent developments aimed at mapping QCD phase diagram and the search for the QCD critical point in heavy-ion collisions are briefly reviewed.
View article: Equilibrium expectations for non-Gaussian fluctuations near a QCD critical point
Equilibrium expectations for non-Gaussian fluctuations near a QCD critical point Open
With the highly anticipated results from the Beam Energy Scan II program at RHIC being recently revealed, an understanding of particle-number fluctuations and their significance as a potential signature of a possible QCD critical point is …
View article: The QCD phase diagram and Beam Energy Scan physics: A theory overview
The QCD phase diagram and Beam Energy Scan physics: A theory overview Open
We review recent theoretical developments relevant to heavy-ion experiments carried out within the Beam Energy Scan program at the Relativistic Heavy Ion Collider. Our main focus is on the description of the dynamics of systems created in …
View article: Nonmonotonic specific entropy on the transition line near the QCD critical point
Nonmonotonic specific entropy on the transition line near the QCD critical point Open
We investigate the effect of the quantum chromodynamics (QCD) critical point on the isentropic trajectories in the QCD phase diagram. We point out that the universality of the critical equation of state and the third law of thermodynamics …
View article: Spin relaxation rate for baryons in a thermal pion gas
Spin relaxation rate for baryons in a thermal pion gas Open
We study the relaxation dynamics of the spin polarization of baryons (nucleon and Λ baryon), in a thermal pion gas as a simple model of the hadronic phase of the QCD plasma produced in relativistic heavy-ion collisions. For this purpose, w…
View article: Relativistic Guiding-Center Motion: Action Principle, Kinetic Theory, and Hydrodynamics
Relativistic Guiding-Center Motion: Action Principle, Kinetic Theory, and Hydrodynamics Open
We treat the guiding-center dynamics in a varying external Maxwell field using a relativistically covariant action principle which reproduces the known Vandervoort expression for the drift velocity and extends it to curved spacetime. We de…
View article: QCD critical point and hydrodynamic fluctuations in relativistic fluids
QCD critical point and hydrodynamic fluctuations in relativistic fluids Open
These lecture notes consist of two major connected parts. The first part (Sections 1, 2), after a brief historical introduction, deals with the physics of critical points in thermodynamic equilibrium. The features of the fluctuations relev…
View article: Relativistic fluctuations in stochastic fluid dynamics
Relativistic fluctuations in stochastic fluid dynamics Open
The state-of-the-art theoretical formalism for a covariant description of non-Gaussian fluctuation dynamics in relativistic fluids is discussed.
View article: Nonmonotonic specific entropy on the transition line near the QCD critical point
Nonmonotonic specific entropy on the transition line near the QCD critical point Open
We investigate the effect of the quantum chromodynamics (QCD) critical point on the isentropic trajectories in the QCD phase diagram. We point out that the universality of the critical equation of state and the third law of thermodynamics …
View article: Finite density QCD equation of state: critical point and lattice-based $T'$-expansion
Finite density QCD equation of state: critical point and lattice-based $T'$-expansion Open
We present a novel construction of the QCD equation of state (EoS) at finite baryon density. Our work combines a recently proposed resummation scheme for lattice QCD results with the universal critical behavior at the QCD critical point. T…
View article: QCD Critical Point and Hydrodynamic Fluctuations in Relativistic Fluids
QCD Critical Point and Hydrodynamic Fluctuations in Relativistic Fluids Open
In this lecture, we discuss the properties of dense hadronic matter inside neutron stars.In particular, we pay attention to the role of strangeness in the core of neutron stars by analysing the presence of baryons and mesons with strangene…
View article: Relativistic fluctuations in stochastic fluid dynamics
Relativistic fluctuations in stochastic fluid dynamics Open
The state-of-the-art theoretical formalism for a covariant description of non-Gaussian fluctuation dynamics in relativistic fluids is discussed.
View article: Spin relaxation rate for baryons in thermal pion gas
Spin relaxation rate for baryons in thermal pion gas Open
We study the relaxation dynamics of the spin polarization of baryons (nucleon and $Λ$-baryon), in a thermal pion gas as a simple model of the hadronic phase of the QCD plasma produced in relativistic heavy-ion collisions. For this purpose,…
View article: Non-Gaussian fluctuation dynamics in relativistic fluids
Non-Gaussian fluctuation dynamics in relativistic fluids Open
We consider nonequilibrium evolution of non-Gaussian fluctuations within relativistic hydrodynamics relevant for the QCD critical point search in heavy-ion collision experiments. We rely on the hierarchy of relaxation timescales, which eme…
View article: Maximum Entropy Freeze-Out of Hydrodynamic Fluctuations
Maximum Entropy Freeze-Out of Hydrodynamic Fluctuations Open
We propose a general approach to freezing out fluctuations in heavy-ion collisions using the principle of maximum entropy. We find the results naturally expressed as a direct relationship between the irreducible relative correlators quanti…
View article: Non-Gaussian fluctuation dynamics in relativistic fluids
Non-Gaussian fluctuation dynamics in relativistic fluids Open
We consider non-equilibrium evolution of non-Gaussian fluctuations within relativistic hydrodynamics relevant for the QCD critical point search in heavy-ion collision experiments. We rely on the hierarchy of relaxation time scales, which e…
View article: Maximum entropy freezeout of hydrodynamic fluctuations
Maximum entropy freezeout of hydrodynamic fluctuations Open
We propose a general approach to freezing out fluctuations in heavy-ion collisions using the principle of maximum entropy. We find the results naturally expressed as a direct relationship between the irreducible relative correlators quanti…
View article: Long Range Plan: Dense matter theory for heavy-ion collisions and neutron stars
Long Range Plan: Dense matter theory for heavy-ion collisions and neutron stars Open
Since the release of the 2015 Long Range Plan in Nuclear Physics, major events have occurred that reshaped our understanding of quantum chromodynamics (QCD) and nuclear matter at large densities, in and out of equilibrium. The US nuclear c…
View article: Functional renormalization group approach to the Yang-Lee edge singularity
Functional renormalization group approach to the Yang-Lee edge singularity Open
Here, we determine the scaling properties of the Yang-Lee edge singularity as described by a one-component scalar field theory with imaginary cubic coupling, using the nonperturbative functional renormalization group in 3 ≤ d ≤ 6 Euclidean…
View article: Spin relaxation rate for heavy quarks in weakly coupled QCD plasma
Spin relaxation rate for heavy quarks in weakly coupled QCD plasma Open
We compute the relaxation rate of the spin density of heavy quarks in a perturbative QCD plasma to leading-log order in the coupling constant $g$. The spin relaxation rate $Γ_s$ in spin hydrodynamics is shown to be $Γ_s\sim g^4\log(1/g)T (…
View article: Fate of Multiparticle Resonances: From $Q$-Balls to $^3$He Droplets
Fate of Multiparticle Resonances: From $Q$-Balls to $^3$He Droplets Open
We consider a system of $N$ nonrelativistic particles which form a near-threshold resonance. Assuming no subset of these particles can form a bound state, the resonance can only decay through an "explosion" into $N$ particles. We show that…
View article: Nondissipative Second-Order Transport, Spin, and Pseudogauge Transformations in Hydrodynamics
Nondissipative Second-Order Transport, Spin, and Pseudogauge Transformations in Hydrodynamics Open
We derive a set of nontrivial relations between second-order transport coefficients which follow from the second law of thermodynamics upon considering a regime close to uniform rotation of the fluid. We demonstrate that an extension of hy…