We investigate the quantum thermodynamics of R-charged D1-branes by incorporating non-perturbative exponential corrections that arise naturally from D-instanton contributions in type IIB string theory. Our approach extends beyond classical supergravity solutions to capture the quantum gravitational regime where traditional thermodynamic descriptions break down. Through systematic analysis of the corrected entropy expression, we derive quantum-modified thermodynamic potentials including temperature, specific heat, internal energy, and Helmholtz free energy, revealing profound deviations from classical behavior in the small-horizon limit where quantum effects dominate. The exponential corrections induce thermodynamic instabilities characterized by negative specific heat and modify the brane’s phase structure, while breaking fundamental scaling relations such as the Smarr formula through quantum deviations that encode the breakdown of classical symmetries. We extend our analysis to quantum work and thermodynamic geometry, demonstrating that these corrections reveal strong attractive microstructural interactions and potential phase transitions near extremality. The thermodynamic curvature diverges negatively in the quantum regime, signaling enhanced correlations among underlying degrees of freedom. Through the AdS/CFT correspondence, we interpret these bulk quantum effects within the dual (1 + 1)-dimensional supersymmetric Yang–Mills theory, identifying suppressed degrees of freedom, anomalous scaling behavior, and quantum-induced trace anomalies in the boundary stress tensor. Our holographic renormalization analysis reveals that quantum corrections effectively reduce the central charge and introduce conformal symmetry breaking, reflecting the deep influence of quantum gravity on strongly coupled gauge theories. These findings establish the critical importance of quantum corrections in black brane thermodynamics and provide new insights into the holographic structure of gauge theories under quantum gravitational influence.

Iran

Behnam Pourhassan

Saheb Soroushfar

Hoda Farahani

Canada

Mir Faizal

Quantum corrections to the thermodynamics of R-charged D1-branes

In this paper, we investigate the thermodynamic behavior of a horizonless compact object within the framework of Rastall–Rainbow (RR) gravity. Working with local shell thermodynamics for gravastar and an exterior fiducial temperature, we show that the RR modification bends temperature to produce two extrema and a stable mass remnant at zero temperature. We show that the gravastar’s shell entropy is smaller than that of a comparable black hole, and that RR modifications introduce a logarithmic correction which contributes to specific heat positivity and a smoother free energy landscape of small gravastars.

Sareh Eslamzadeh

Thermodynamic analysis of a compact object in Rastall–Rainbow gravity

The astrophysical consequences of the presence of a quintessence scalar field on the evolution of the horizon and on the accretion disk surrounding a static black hole, in the scalar–vector–tensor version of modified gravity (MOG), are investigated. The positions of the stable circular orbits of the massive test particles, moving around the central object, are obtained from the extremum of the effective potential. Detailed calculations are also presented to investigate the light deflection, shadow and Shapiro effect for such a black hole. The electromagnetic properties of the accretion disks that form around such black holes are considered in detail. The energy flux and efficiency parameter are estimated analytically and numerically. A comparison with the disk properties in Schwarzschild geometry is also performed. The quantum properties of the black hole are also considered, and the Hawking temperature and the mass loss rate due to the Hawking radiation are considered. The obtained results may lead to the possibility of direct astrophysical tests of black hole type objects in modified gravity theories.

South Africa

Haidar Sheikhahmadi

S. Sajadi

Romania

Tiberiu Harko

Astrophysical and electromagnetic emissivity properties of black holes surrounded by a quintessence type exotic fluid in the scalar–vector–tensor modified gravity

We will investigate a system of M2-M5 branes as a black M2-M5 bound state. The behavior of this system will be investigated at short distances. At such scales, we will have to incorporate quantum gravitational corrections to the supergravity solutions. We will study the non-equilibrium quantum thermodynamics of this black M2-M5 bound state. The quantum work for this solution will be obtained using the Jarzynski equality. We will also study the corrections to the thermodynamic stability of this system from quantum gravitational corrections. We will use the concept of a novel quantum mass to analyze the quantum gravitational corrections to the information geometry of this system. This will be done using effective quantum metrics for this system.

Algeria

Houcine Aounallah

India

Sudhaker Upadhyay

United Kingdom

Yermek Aitenov

Salman Wani

Quantum thermodynamics of an M2-M5 brane system

In this paper, we will obtain quantum work for a quantum scale five dimensional Myers-Perry black hole. Unlike heat represented by Hawking radiation, the quantum work is represented by a unitary information preserving process, and becomes important for black holes only at small quantum scales. It will be observed that at such short distances, the quantum work will be corrected by non-perturbative quantum gravitational corrections. We will use the Jarzynski equality to obtain this quantum work modified by non-perturbative quantum gravitational corrections. These non-perturbative corrections will also modify the stability of a quantum Myers-Perry black hole. We will define a quantum corrected information geometry by incorporating the non-perturbative quantum corrections in the information geometry of a Myers-Perry black hole. We will use several different quantum corrected effective information metrics to analyze the stability of a quantum Myers-Perry black hole.

Quantum work and information geometry of a quantum Myers-Perry black hole

In this paper, we analyze the inflationary cosmology using string field theory. This is done by using the zero level contribution from string field theory, which is a non-local tachyonic action. We will use the non-local Friedmann equations for this model based on string field theory, and calculate the slow-roll parameters for this model. We will then explicitly obtain the scalar and tensorial power spectrum, their related indices, and the tensor-to-scalar ratio for this model. Finally, we use cosmological data from Planck 2013 to 2018 to constrain the free parameters in this model, and find that string field theory is compatible with them.

Ali Aghamohammadi

Russia

Estonia

Sebastian Bahamonde

Inflation in string field theory

In order to study the phase transition through thermodynamic geometry, we consider the charged AdS black hole with global monopole. We first introduce thermodynamics of charged AdS black hole with global monopole by discussing the dependence of Hawking temperature, specific heat and <math><mi>P</mi><mo>−</mo><mi>v</mi></math> curve on horizon radius and monopole parameter. By implementing various thermodynamic geometry methods, for instance, Weinhold, Ruppiner, Quevedo and HPEM formulations, we derive corresponding scalar curvatures for charged AdS black hole with a global monopole. Here, we observe that, in contrast to Weinhold and Ruppeiner methods, HPEM and Quevedo formulations provide more information about the phase transition of the charged AdS black hole with a global monopole.

Phase transition of a charged AdS black hole with a global monopole through geometrical thermodynamics

In this paper, we consider three types (static, static charged, and rotating charged) of black holes in f ( R ) gravity. We study the thermodynamical behavior, stability conditions, and phase transition of these black holes. It is shown that the number and type of phase transition points are related to different parameters, which shows the dependency of the stability conditions to these parameters. Also, we extend our study to different thermodynamic geometry methods (Ruppeiner, Weinhold, and GTD). Next, we investigate the compatibility of curvature scalar of geothermodynamic methods with phase transition points of the above black holes. In addition, we point out the effect of different values of the spacetime parameters on the stability conditions of mentioned black holes.

Reza Saffari

Negin Kamvar

Thermodynamic geometry of black holes in f ( R ) gravity