<p>We investigate cosmic censorship in anti–de Sitter space in holographic models in which the ground state is described by a good singularity. These include supersymmetric truncations of string/M theory, for which a positive-energy theorem holds. At the boundary, our solutions describe a boost-invariant fluid in which the temperature decreases monotonically with time. On the gravity side, they correspond to black-brane spacetimes with a receding horizon. In classical gravity, curvature invariants at the horizon grow without bound. In the full theory this regime may or may not be reached. In some cases it is avoided by a phase transition to a regular geometry. In others it is reached but the boundary hydrodynamic evolution can be continued, provided the equation of state at parametrically small energies is known. Both cases require the inclusion of finite-<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math> or finite-coupling effects.</p>

Netherlands

Marc Aragonès Fontboté

Spain

David Mateos

Guillem Pérez Martín

CERN

Wilke van der Schee

Javier G. Subils

Cosmic Censorship in a Dual Collider

<p>We formulate fermionic versions, for any number of spatial dimensions, of the van der Waals and Casimir-Polder interactions and study their properties. In both cases, the systems we introduce contain localized “atoms”: two-level systems, coupled to a vacuum Dirac field. This Dirac field plays here a role akin to the electromagnetic field in the van der Waals case. In this context, bag model conditions for the Dirac field serve as the analog of the “mirror” in the Casimir-Polder effect. We found that, in this case, the resulting interaction is repulsive.</p>

Argentina

C.D. Fosco

G. Hansen

Fermionic van der Waals and Casimir-Polder interactions

This paper is designed for heavy pulsars coming from the Neutron Star Interior Composition Explorer. The research model is describe by Einstein field equations for anisotropic fluid configuration with spherical symmetry. As per present perceptiveness, modified non-linear Van der Waals equation of state is used to relate physical variables. The continuity of inner and outer matter is obtained by comparing inner spacetime to outer Schwarzschild metric. The physical viability of this model is evaluated and further it is compared with observational data of pulsars PSR J0348+0432, PSR J0740+6620 and PSR J0030+0451. The model fulfils all physical and mathematical characteristics of the dense structure studies. It offers the factual proofs carried by evolution of celestial configurations. The working model presented here is physically viable and shows stable behaviour.

Pakistan

S. Mardan

A. Khalid

Rubab Manzoor

Lebanon

Czechia

Muhammad Riaz

Anisotropic model observing pulsars from Neutron Star Interior Composition with modified Van der Waals equation of state

Studying the thermodynamics of the systems produced in ultra-relativistic heavy-ion collisions is crucial in understanding the QCD phase diagram. Recently, a new avenue has opened regarding the implications of large initial angular momentum and subsequent vorticity in the medium evolution in high-energy collisions. This adds a new type of chemical potential into the partonic and hadronic systems, called the rotational chemical potential. We study the thermodynamics of an interacting hadronic matter under rotation, formed in an ultra-relativistic collision. We introduce attractive and repulsive interactions through the van der Waals equation of state. Thermodynamic properties like the pressure (P), energy density ( $$\varepsilon $$  <math> <mi>ε</mi> </math>  ), entropy density (s), trace anomaly ( $$(\varepsilon - 3P)/T^{4}$$  <math> <mrow> <mrow> <mo>(</mo> <mi>ε</mi> <mo>-</mo> <mn>3</mn> <mi>P</mi> <mo>)</mo> </mrow> <mo>/</mo> <msup> <mi>T</mi> <mn>4</mn> </msup> </mrow> </math>  ), specific heat ( $$c_\textrm{v}$$  <math> <msub> <mi>c</mi> <mtext>v</mtext> </msub> </math>  ) and squared speed of sound ( $$c_\textrm{s}^{2}$$  <math> <msubsup> <mi>c</mi> <mtext>s</mtext> <mn>2</mn> </msubsup> </math>  ) are studied as functions of temperature (T) for zero and finite rotation chemical potential. The conserved charge fluctuations, which can be quantified by their respective susceptibilities, are also studied. The rotational (spin) density corresponding to the rotational chemical potential is explored. In addition, we explore the possible liquid–gas phase transition in the hadron gas with van der Waals interaction in the T –  $$\omega $$  <math> <mi>ω</mi> </math>   phase space.

India

Kshitish Pradhan

Bhagyarathi Sahoo

Dushmanta Sahu

Raghunath Sahoo

Thermodynamics of a rotating hadron resonance gas with van der Waals interaction

In this paper, the m-component super KP hierarchy in form of free superfermions is constructed by Clifford superalgebra. The super bosonic counterpart of this hierarchy is described by using the vertex operators. Based on this, some super Hirota equations are determined and the bilinear identity is expressed by super Baker functions and tau function. Darboux transformation in terms of superfermions is also discussed.

China

Huizhan Chen

The m-component super KP hierarchy in Kac-van de Leur version

We present an estimate of the yield of hard probes expected for collisions of the isobars <math><msubsup><mrow></mrow><mrow><mn>44</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math>Ru and <math><msubsup><mrow></mrow><mrow><mn>40</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math>Zr at collision energies reachable at RHIC and the LHC. These yields are proportional to the number of binary nucleon-nucleon interactions, which is characteristically different due to the presence of the large neutron skin in <math><msubsup><mrow></mrow><mrow><mn>40</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math>Zr. This provides an independent opportunity to measure the difference between the neutron skin of <math><msubsup><mrow></mrow><mrow><mn>44</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math>Ru and <math><msubsup><mrow></mrow><mrow><mn>40</mn></mrow><mrow><mn>96</mn></mrow></msubsup></math>Zr, which can provide an important constraint on the Equation of State of cold neutron-rich matter.

United States

Yen-Jie Lee

Govert Nijs

Yi Chen

Hard probes in isobar collisions as a probe of the neutron skin

We show that the same QCD formalism that accounts for the suppression of high-<math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></mrow></math> hadron and jet spectra in heavy-ion collisions predicts medium-enhanced production of <math><mi>c</mi><mover><mi>c</mi><mo>¯</mo></mover></math> pairs in jets. We demonstrate that this phenomenon, which cannot be accessed by traditional jet-quenching observables, can be directly observed using <math><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mover><mrow><mi>D</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow></msup></mrow></math>-tagged jets in nuclear collisions.

Maximilian Attems

United Kingdom

Jasmine Brewer

Gian Michele Innocenti

Germany

Aleksas Mazeliauskas

Sohyun Park

France

Gregory Soyez

Urs Achim Wiedemann

Medium-Enhanced <math><mi>c</mi><mover><mi>c</mi><mo>¯</mo></mover></math> Radiation

Ultracentral heavy ion collisions due to their exceptionally large multiplicity probe an interesting regime of quark-gluon plasma where the size is (mostly) fixed and fluctuations in the initial condition dominate. Spurred by the recent measurement of the CMS collaboration we investigate the driving factors of the increase of transverse momentum, including a complete analysis of the influence of the QCD equation of state. Particularly interesting is the influence of the centrality selection as well as the initial energy deposition.

Ultracentral heavy ion collisions, transverse momentum and the equation of state

Abstract In this work, we study the thermodynamic topology of a static, a charged static, and a charged rotating black hole in f(R) gravity. For charged static black holes, we work in two different ensembles: the fixed charge (q) ensemble and fixed potential (ϕ) ensemble. For charged rotating black holes, four different types of ensembles are considered: fixed (q, J), fixed (ϕ, J), fixed (q, Ω), and fixed (ϕ, Ω) ensemble, where J and Ω denote the angular momentum and the angular frequency, respectively. Using the generalized off-shell free energy method, where the black holes are treated as topological defects in their thermodynamic spaces, we investigate the local and global topologies of these black holes via the computation of winding numbers at these defects. For the static black hole we work in three models. We find that the topological charge for a static black hole is always −1 regardless of the values of the thermodynamic parameters and the choice of f(R) model. For a charged static black hole, in the fixed charge ensemble, the topological charge is found to be zero. Contrastingly, in the fixed ϕ ensemble, the topological charge is found to be −1. For charged static black holes, in both the ensembles, the topological charge is observed to be independent of the thermodynamic parameters. For charged rotating black holes, in the fixed (q, J) ensemble, the topological charge is found to be 1. In the fixed (ϕ, J) ensemble, we find the topological charge to be 1. In the case of the fixed (q, Ω) ensemble, the topological charge is 1 or 0 depending on the value of the scalar curvature (R). In the fixed (Ω, ϕ) ensemble, the topological charge is −1, 0, or 1 depending on the values of R, Ω, and ϕ. Therefore, we conclude that the thermodynamic topologies of the charged static black hole and charged rotating black hole are influenced by the choice of ensemble. In addition, the thermodynamic topology of the charged rotating black hole also depends on the thermodynamic parameters.

Bidyut Hazarika

Prabwal Phukon

Thermodynamic Topology of Black Holes in f(R) Gravity Nobel Lecture: Accelerating Expansion of the Universe through Observation of Distant Supernovae RPS thermodynamics of Taub–NUT AdS black holes in the presence of central charge and the weak gravity conjecture Topological Interpretation of Black Hole Phase Transition in Gauss-Bonnet Gravity Thermodynamic Topological Classifications of Well-Known Black Holes Topology of black hole thermodynamics via Rényi statistics Rényi Topology of Charged-flat Black Hole: Hawking-Page and Van-der-Waals Phase Transitions Topology and phase transition for EPYM AdS black hole in thermal potential Thermodynamic phase transition and winding number for the third-order Lovelock black hole Topology of critical points in boundary matrix duals Topological classes of BTZ black holes Thermodynamic Topology of D=4,5 Horava Lifshitz Black Hole in Two Ensembles Thermodynamic topology of Kerr-Sen black holes via Rényi statistics The structure of the topological current Propagation and Fluxes of Ultra High Energy Cosmic Rays in f(R) Gravity Theory Anisotropies of Diffusive Ultra-high Energy Cosmic Rays in f(R) Gravity Theory

Luminosity is the key quantity characterizing the performance of charged particle colliders. Precise luminosity determination is an important task in collider physics. Part of this task is the proper calibration of detectors dedicated for luminosity measurements. The wide-used experimental method of calibration is the van-der-Meer scan, which is the beam separation scan performed at specifically optimized beam conditions. This work is devoted to modeling this scan with the q-Gaussian distribution of particles in colliding beams. Because of its properties, the q-Gaussian distribution is believed to describe the density closer to reality than regular Gaussian-based models. In this work, the q-Gaussian model is applied for van-der-Meer scan modeling, and the benefits of this model for luminosity calibration task are demonstrated.