Ritabrata Biswas, Subenoy Chakraborty
In the present work we study (i) charged black hole in Einstein-Gauss-Bonnet (EGB) theory, known as Einstein-Maxwell-Gauss-Bonnet (EMGB) black hole and (ii) black hole in EGB gravity with Yang-Mills field. The thermodynamic geometry of these two black hole solutions has been investigated, using the modified entropy in Gauss-Bonnet theory.
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This paper deals with five-dimensional black hole solutions in (a) Einstein-Yang-Mills-Gauss-Bonnet theory and (b)Einstein-Maxwell-Gauss-Bonnet theory with a cosmological constant for spherically symmetric space time. The geometry of the black hole thermodynamics has been studied for both the black holes.
We consider the Gauss-Bonnet corrected Bardeen black hole solution in 4-D AdS space-time. The solution is obtained by the limiting procedure adopted by Glavan and Lin in 4-D Einstein-Gauss-Bonnet gravity. The general form of first law of black hole thermodynamics is utilized to calculate various thermodynamics variables. The solution exhibit P-v criticality and belong to the universality class of van-der Waals fluid. The effect of Gauss-Bonnet coupling is investigated on critical parameters and inversion temperature.
Recently, the non-trivial solutions for 4-dimensional black holes of Einstein-Gauss-Bonnet gravity had been discovered. In this paper, considering a charged particle entering into a 4-dimensional Gauss-Bonnet-Maxwell black hole, we calculate the black hole thermodynamic properties by using the Hamilton-Jacobi equation. In the normal phase space, the cosmological constant and Gauss-Bonnet parameter are fixed, the black hole satisfies the first and second laws of thermodynamics and the weak cosmic censorship conjecture (WCCC) is valid. On the other hand, in the case of extended phase space, the …
We study the thermodynamic properties of black hole horizons in Einstein Gauss Bonnet gravity. We derive the thermodynamic products of characteristic parameters to mark which are global. We further interpret the stability of the black holes by computing the specific heat for both horizons. Stable and unstable phases of horizons are pointed out. The phase transitions with respect to the charge in nature of specific heat are also observed. All these calculation might be helpful to understand the microscopic nature of such black holes.
We studied the thermodynamics of the black holes with Gauss-Bonnet correction term in $3+1-$ dimensional AdS spacetime. It is known that the term has no effect on the equation of motion, however, it modifies the entropy formula of Wald as it has an effect of the Gauss-Bonnet parameter term. We studied charged black holes, namely, Reissner-Nordström and Born-Infeld under this regime. We encountered divergences in heat capacity. After eliminating the possibility of first order phase transition, we applied two well trusted methods from standard thermodynamics, namely, Ehrenfest scheme and Ruppein…
In this paper, we will generalize the Gauss-Bonnet gravity to an energy dependent Gauss-Bonnet theory of gravity, which we shall call as the Gauss-Bonnet gravity's rainbow. We will also couple this theory to a Maxwell's theory. We will analyze black hole solutions in this energy dependent Gauss-Bonnet gravity's rainbow. We will calculate the modifications to the thermodynamics of black holes in the Gauss-Bonnet's gravity's rainbow. We will demonstrate that even though the thermodynamics of the black holes get modified in the Gauss-Bonnet gravity's rainbow, the first law of thermodynamics still…
Thermodynamics of the FLRW apparent horizon in Einstein-Gauss-Bonnet gravity
该研究在爱因斯坦-高斯-博内引力中分析FLRW表观视界的热力学，发现其可视为暗能量流体，并推导出耦合常数的离散化。
We investigate the thermodynamics of Gauss-Bonnet black holes in asymptotically de Sitter spacetimes embedded in an isothermal cavity, via a Euclidean action approach. We consider both charged and uncharged black holes, working in the extended phase space where the cosmological constant is treated as a thermodynamic pressure. We examine the phase structure of these black holes through their free energy. In the uncharged case, we find both Hawking-Page and small-to-large black hole phase transitions, whose character depends on the sign of the Gauss-Bonnet coupling. In the charged case, we demon…
We investigate the validity of generalized second law of thermodynamics of a physical system comprising of newly proposed dark energy model called Ricci Gauss-Bonnet and cold dark matter enveloped by apparent horizon and event horizon in flat Friedmann-Robertson-Walker (FRW) universe. For this purpose, Bekenstein entropy, Renyi, logarithmic and power law entropic corrections are used. It is found that this law exhibits the validity on both apparent and event horizons except for the case of logarithmic entropic correction at apparent horizon. Also, we check the thermodynamical equilibrium condi…
In this paper, the generalized second law (GSL) of thermodynamics and entropy is revisited in the context of cosmological models in Gauss-Bonnet gravity with the boundary of the universe is assumed to be enclosed by the dynamical apparent horizon. The model is best fitted with the observational data for distance modulus. The best fitted geometric and thermodynamic parameters such as equation of state parameter, deceleration parameter and entropy are derived. To link between thermodynamic and geometric parameters, the "entropy rate of change multiplied by the temperature" as a model independent…
Thermodynamics and phase transition in central charge criticality of charged Gauss-Bonnet AdS black holes
本文通过引入中心荷重新表述带电Gauss-Bonnet AdS黑洞的热力学第一定律，研究其临界行为与相变结构，并在D=6维中发现小、中、大黑洞共存的三相点。
Motivated by the string corrections on the gravity and electrodynamics sides, we consider a quadratic Maxwell invariant term as a correction of the Maxwell Lagrangian to obtain exact solutions of higher dimensional topological black holes in Gauss-Bonnet gravity. We first investigate the asymptotically flat solutions and obtain conserved and thermodynamic quantities which satisfy the first law of thermodynamics. We also analyze thermodynamic stability of the solutions by calculating the heat capacity and the Hessian matrix. Then, we focus on horizon-flat solutions with adS asymptote and produc…
Thermodynamics and phase transitions of nonlinearly scalarized black holes in Einstein-scalar-Gauss-Bonnet theory
研究具有多项式耦合函数的爱因斯坦-标量-高斯-博内理论中静态非线性标量化黑洞的热力学性质，计算其热力学量，并分析史瓦西黑洞与标量化黑洞之间的一级相变。
Kerr-Gauss-Bonnet Black Holes: An Analytical Approximation
Gauss-Bonnet引力理论为研究超对称弦论中爱因斯坦作用量的曲率修正提供了一个最有前途的框架，同时避免了鬼现象，保持了二阶场方程。虽然高斯-邦内黑洞的Schwarzschild型解早已为人所知，但Kerr-Gauss-Bonnet度规却一直缺失。本文解析地导出了自旋黑洞的五维Gauss-Bonnet近似，并简述了有关的物理性质。
Gauss-Bonnet type identity in Weyl-Cartan space
在Weyl-Cartan空间中，利用变分方法导出了Gauss-Bonnet型恒等式.
In this paper we investigate the strong gravitational lensing with Gauss-Bonnet gravity. By considering the logarithmic term for deflection angle, we obtain the deflection angle $\hatα$ and corresponding parameters $\bar{a}$ and $\bar{b}$. Finally, by using the relations between the observables and lensing parameters, we estimate the observables such as, $θ_{\infty}$, $s$ and $r_m$, for the relativistic images in the Gauss-Bonnet background.
The Barrow entropies in the thermodynamics of high-dimensional Gauss-Bonnet black holes
研究高维高斯-博内黑洞的热力学性质，探讨巴罗熵对事件视界、霍金温度、熵和热容的影响，发现六维和七维黑洞因负热容而能量消失。
Thermodynamics of Gauss-Bonnet black holes revisited
研究了五维反德西特时空中的Gauss-Bonnet黑洞.我们分析了GBAdS的所有热力学量，并与Born-Infeld-AdS（BIAdS）、Reissner-Norström-AdS黑洞（RNAdS）、Schwarzschild-AdS（SAdS）和BTZ黑洞进行了比较.对于$c<0$，我们不能得到质量、温度和熵的热力学量为正定的黑洞，因为熵不满足面积定律。另一方面，对于$c>0$，我们发现了类BIAdS黑洞，说明耦合$c$起着赝荷的作用。重要的是，我们不能在$c\to 0$的限制下获得SAdS，这意味着GBAdS与SAdS基本不同。此外，我们澄清热力学和动力学稳定性之间的联系。最后，我们还推测，如果一个黑洞是大的，因而是全局稳定的，那么它的拟正规模可能具有解析表达式。
Power-law anisotropic cosmological solution in 5+1 dimensional Gauss-Bonnet gravity
本文给出了一个在Gauss-Bonnet引力下的5+1维平坦宇宙的各向异性解。在所研究的模型中，这个解取代了宇宙学奇点附近的广义Kasner解。
The time delay between two relativistic images in the strong gravitational lensing governed by Gauss-Bonnet gravity is studied. We derive and calculate the expression of time delay due to the Gauss-Bonnet coupling. It is shown that the time delay for two images with larger space each other is longer. We also find that the ratio of Gauss-Bonnet coefficient and the mass of gravitational source changes in the region like $\fracα{M}\in[0,2)$. The time delay is divergent with $\fracα{M}\longrightarrow 2$.
Evolution of Brane-Localised Standard Model Fields in Gauss-Bonnet theory
研究了高维Gauss-Bonnet时空中四维膜上的无质量标量场、Dirac场和电磁场的传播。我们在时域中计算了球对称黑洞的基本准正规模。我们还观察到一个普遍的行为，独立于一个字段和值的高斯-邦纳参数，在渐近晚的时间。
Probing the thermodynamics of charged Gauss Bonnet AdS black holes with the Lyapunov exponent
该研究针对带电AdS高斯-博内黑洞，结合类时与类光测地线分析李雅普诺夫指数与热力学量的关联，验证其可表征黑洞相转变、三相点及作为序参量的特性，还用于探究黑洞阴影。
The influence of non-minimal coupling of a scalar field and the Gauss-Bonnet term on the inflationary stage of evolution of the universe is investigated in this paper. The main cosmological effects of such a coupling were considered. The deviations between Einstein-Gauss-Bonnet inflation and standard one based on Einstein gravity were determined. The corrections of a weak GB coupling preserving the type of the scalar field potential to standard inflationary models is considered as well.
We have investigated tidal forces and geodesic deviation motion in the 4D-Einstein-Gauss-Bonnet spacetime. Our results show that tidal force and geodesic deviation motion depend sharply on the sign of Gauss-Bonnet coupling constant. Comparing with Schwarzschild spacetime, the strength of tidal force becomes stronger for the negative Gauss-Bonnet coupling constant, but is weaker for the positive one. Moreover, tidal force behaves like those in the Schwarzschild spacetime as the coupling constant is negative, and like those in Reissner-Nordström black hole as the constant is positive. We also pr…
We consider black hole in Einstein-Gauss-Bonnet(EGB) gravity in a dynamical setup and also the stationary black hole in recently discovered\cite{Glavan} $4$-dimensional novel Einstein-Gauss-Bonnet gravity. For dynamical EGB black hole in completely local settings we calculate the temperature associated with the horizon. For the stationary black hole in $4$-dimensional novel EGB theory we explore the thermodynamic properties including calculation of temperature and entropy.
5D-Black Hole Solution in Einstein-Yang-Mills-Gauss-Bonnet Theory
采用五维形式的吴杨算符，我们给出了EYMGB理论中的一个封闭形式的黑洞解.在EYM极限下，我们恢复了已知的5D黑洞解。
We investigate the absorption cross section of planar scalar massless waves impinging on spherically symmetric black holes which are solutions of the novel 4D Einstein-Gauss-Bonnet theory of gravity. Besides the mass of the black hole, the solution depends also on the Gauss-Bonnet constant coupling. Using the partial waves approach, we show that the absorption cross section depends on the Gauss-Bonnet coupling constant. Our numerical results present excellent agreement with the low- and high- frequency approximations, including the so-called sinc approximation.
Global properties of dilatonic Gauss-Bonnet black holes
本文研究了与标量场非极小耦合的Einstein Gauss-Bonnet系统球对称解的相空间，证明了四维中唯一正则的黑洞解是渐近平坦的
Thermodynamic instability of splitting thin shell solutions in braneworld Einstein-Gauss-Bonnet gravity
针对五维 Einstein–Gauss–Bonnet 膜世界中同一初始数据对应多个分裂真空薄壳解的问题，本文通过比较自由能发现热力学优选判据与分裂解存在的动力学判据等价。
In this paper, we first use the optical metrics of black-bounce traversable wormholes to calculate the Gaussian curvature. Then we use the Gauss-Bonnet theorem to obtain the weak deflection angle of light from the black-bounce traversable wormholes. Then we investigate the effect of dark matter medium on weak deflection angle using the Gauss-Bonnet theorem. We show how weak deflection angle of wormhole is affected by the bounce parameter $a$. Using the Gauss-bonnet theorem for calculating weak deflection angle shows us that light bending can be thought as a global and topological effect.
We study the cosmological model based on Einstein-Gauss-Bonnet gravity with non-minimal coupling of a scalar field to a Gauss-Bonnet term in 4D Friedmann universe. We show how constructing the exact solutions by the method based on a confrontation of the Hubble parameter in the model under consideration with that in a standard scalar field inflationary cosmology.
Black hole solutions of dimensionally reduced Einstein-Gauss-Bonnet gravity with a cosmological constant
本文研究了由具有宇宙学常数的六维Einstein-Gauss-Bonnet作用量降维得到的系统球对称解的相空间。我们证明了所有的物理解都具有反de Sitter渐近行为。
Global properties of charged dilatonic Gauss-Bonnet black holes
研究了与标量场非极小耦合的Einstein-Maxwell-Gauss-Bonnet系统球对称解的相空间，证明了除了渐近平坦解外，还存在非寻常渐近解.我们还发现了双电子爱因斯坦-麦克斯韦理论的新的双电子解。
Horizons of radiating black holes in Einstein gauss-bonnet gravity
研究了具有Gauss-Bonnet二次曲率项贡献的5维Einstein引力场中基于Vaidya的辐射黑洞模型。确定了辐射黑洞的视视界和事件视界的结构和位置。
Modified gravity theories are of great interest in both observational and theoretical studies. In this article we study the correlation between the null geodesics in the background of a four-dimensional Einstein-Maxwell-Gauss-Bonnet AdS black hole, a modification of Einstein gravity, and it's thermodynamic phase transition. We study the phase structure of the black hole, using the coexistence and spinodal curves, to understand the phase transition in a extended phase space. The imprints of this phase transition features are observed in the behaviour of photon orbit radius and minimum impact pa…
Internal structure of a Maxwell-Gauss-Bonnet black hole
研究了麦克斯韦场对静态、渐近平坦、球对称高斯-博内黑洞的影响。数值计算表明，如果电荷增加超过一个临界值，内行列式奇异性被取代的内奇异视界。
Asymptotic properties of black hole solutions in dimensionally reduced Einstein-Gauss-Bonnet gravity
本文研究了由六维Einstein-Gauss-Bonnet作用量降维得到的系统球对称解的渐近性态。我们表明，在一般的标量场参数化的内部空间的大小是不平凡的，但尽管如此，解决方案取决于一个单一的参数。与其他包含高斯-邦纳项的模型类似，如果假设视界的最小半径，则可以避免裸奇点。
The purpose of this Comment is to point out that there are conceptual and mathematical flaws in the analysis in "Light deflection by Damour-Solodukhin wormholes and Gauss-Bonnet theorem, Phys. Rev. D 98, 044033 (2018) by Ali Övgün".
The objective of this paper is to analyze the weak deflection angle of Einstein-Gauss-Bonnet gravity in the presence of plasma medium. To attain our results, we implement the Gibbons and Werner approach and use the Gauss-Bonnet theorem to Einstein gravity to acquire the resulting deflection angle of photon's ray in the weak field limit. Moreover, we illustrate the behavior of plasma medium and non-plasma mediums on the deflection of photon's ray in the framework of Einstein-Gauss-Bonnet gravity. Similarly, we observe the graphical influences of deflection angle on Einstein-Gauss-Bonnet gravity…
Thermodynamics of Einstein-Gauss-Bonnet Black Holes under the Generalized Uncertainty Principle
研究探讨了广义不确定性原理对五维爱因斯坦-高斯-博内黑洞热力学的影响，发现黑洞演变为稳定残余体，修正熵形式与高维时空结果一致。
Lagrangian Brane Dynamics in General Relativity and Einstein-Gauss-Bonnet Gravity
本文给出了广义相对论和Einstein-Gauss-Bonnet引力中膜作用量和膜动力学的一种新的、简明的推导方法。我们提出了一个统一的处理，适用于类时表面层和类空过渡层，并包括考虑更困难的类光的情况。
Black hole solutions of dimensionally reduced Einstein-Gauss-Bonnet gravity
我们研究了由六维Einstein-Gauss- Bonnet作用量降维得到的系统球对称解的相空间。我们证明了解的存在性与非平坦的渐近行为。
A self-interacting SU(2)-doublet of complex scalar fields, minimally coupled to Einstein-Gauss-Bonnet gravity is considered in five space-time dimensions. The classical equations admit two families of solitons corresponding to spinning and non-spinning bosons stars. The generic solutions are constructed numerically and agree with exact results that are available in special limits of the parameters. The pattern of the boson stars is shown to be qualitatively affected by the Gauss-Bonnet coupling constant.
The second law and the generalized second law of thermodynamics in cosmology in the framework of the modified Gauss-Bonnet theory of gravity are investigated. The conditions upon which these laws hold are derived and discussed.
By using the scattering of a scalar field, we discuss the thermodynamics and overcharging problem in a 4D Gauss-Bonnet AdS black hole in both the normal phase space and extended phase space. In the normal phase space, where the cosmological constant and Gauss-Bonnet parameter are fixed, the first law and the second law of thermodynamics are valid. In addiction, the black hole cannot be overcharged and the weak cosmic censorship conjecture is valid. In the extended phase space, where the cosmological constant and Gauss-Bonnet parameter are treated as the thermodynamic variables, the first law i…
By using a new approach, we demonstrate analytic expressions for slowly rotating Gauss-Bonnet charged black holes with negative cosmological constant. Up to the linear order of the rotating parameter a, the mass, Hawking temperature and entropy of the charged black holes get no corrections from rotation.
We derive an exact black hole solution for the Einstein-Gauss-Bonnet gravity with Yang-Mills field in $4D$ AdS spacetime and investigate its thermodynamic properties to calculate exact expressions for the black hole mass, temperature, entropy and heat capacity. The thermodynamic quantities get modification in the presence of Yang-Mills field, however, entropy remains unaffected by the Yang-Mills charge. The solution exhibits $P-v$ criticality and belongs to the universality class of Van der Waals fluid. We study the effect of Gauss-Bonnet coupling and Yang-Mills charge on the critical behaviou…
Unified first law of thermodynamics in Gauss-Bonnet gravity on an FLRW background
本文利用热力学统一第一定律，在Gauss-Bonnet引力中推导FLRW宇宙的Friedmann方程，并证明广义第二定律的有效性。
Deep Connection Between Thermodynamics and Gravity in Gauss-Bonnet Braneworld
我们揭示了热力学和引力之间的深刻联系，在一般braneworld模型与曲率修正项的膜和体，分别。我们证明了嵌入在5维时空中的3-膜上的Friedmann方程可以在视视界上直接写成热力学热力学第一定律的形式。利用第一定律，我们得到了膜上视视界的熵表达式，这对于研究Gauss-Bonnet引力下膜上黑洞视界的物理性质是有用的。
We construct solutions of a model which includes the Gauss-Bonnet and Born-Infeld terms for various horizon topologies $(k=0, \pm 1)$, and then the mass, temperature, entropy and heat capacity of black holes are computed. For the sake of simplicity, we perform the stability analysis of five dimensional topological black holes in AdS space.
Considering a canonical ensemble, in which the temperature and the charge on a wall of the cavity are fixed, we investigate the thermodynamics of a D-dimensional Gauss-Bonnet black hole in a finite spherical cavity. Moreover, it shows that the first law of thermodynamics is still satisfied. We then discuss the phase structure and transition in both five and six dimensions. Specifically, we show that there always exist two regions in the parameter space. In one region, the system possesses one single phase. However in the other region, there could coexist three phases and a van der Waals-like p…
Employing two classes of nonlinear electrodynamics, we obtain topological black hole solutions of Gauss-Bonnet gravity. We investigate geometric properties of the solutions and find that there is an intrinsic singularity at the origin. We investigate the thermodynamic properties of the asymptotically flat black holes and also asymptotically adS solutions. Using suitable local transformation, we generalize static horizon-flat solutions to rotating ones. We discuss their conserved and thermodynamic quantities as well as the first law of thermodynamics. Finally, we calculate the heat capacity of …
By looking at the Lovelock theorem one can infer that the gravity model given by \cite{GL} could not applicable for all type of 4D Einstein Gauss Bonnet (GB) curved spacetimes. Because in 4D space time the Gauss-Bonnet invariant is a total derivative, and hence it does not contribute to the gravitational dynamics. Hence, authors in the work \cite{AL} presented an alternative consistent EGB gravity model instead of \cite{GL} by applying break of diffeomorphism property. In this work we use it to produce a dS/AdS black hole metric and then investigate its thermodynamic behavior in presence of cl…
We study holographic superconductors in Einstein-Gauss-Bonnet gravity. We consider two particular backgrounds: a $d$-dimensional Gauss-Bonnet-AdS black hole and a Gauss-Bonnet-AdS soliton. We discuss in detail the effects that the mass of the scalar field, the Gauss-Bonnet coupling and the dimensionality of the AdS space have on the condensation formation and conductivity. We also study the ratio $ω_g/T_c $ for various masses of the scalar field and Gauss-Bonnet couplings.
In this paper, we investigate the four-dimensional Einstein-Gauss-Bonnet black hole. The thermodynamic variables and equations of state of black holes are obtained in terms of a new parameterization. We discuss a formulation of the van der Waals equation by studying the effects of the temperature on P-V isotherms. We show the influence of the Cauchy horizon on the thermodynamic parameters. We prove by different methods, that the black hole entropy obey area law (plus logarithmic term that depends on the Gauss-Bonnet coupling α). We propose a physical meaning for the logarithmic correction to t…
Gauss-Bonnet Gravity with Scalar Field in Four Dimensions
在一定的假设下，给出了四维Einstein-Gauss-Bonnet场方程与标量场耦合的所有精确解。
In this paper, we study the thermodynamic geometry of charged Gauss-Bonnet black holes (and Reissner-Nordström black holes, for the sake of comparison) in AdS: in both $(T,V)$- and $(S,P)$-planes. The thermodynamic phase space is known to have an underlying contact and metric structure; Ruppeiner geometry then naturally arises in this framework. Sign of Ruppeiner curvature can be used to probe the nature of interactions between the black hole microstructures. It is found that there are both attraction and repulsion dominated regions which are in general determined by the electric charge, Gauss…
In this paper, we investigate a class of $5$-dimensional black holes in the presence of Gauss-Bonnet gravity with dyonic charges. At first step, thermodynamical quantities of the black holes and their behaviors are explored for different limits. Thermal stability and the possibility of the van der Waals like phase transition are addressed and the effects of different parameters on them are investigated. The second part is devoted to simulation of the trajectory of particles around these black holes and investigation of the angular frequency of particles' motion. The main goal is understanding …
We propose a boundary term to the Einstein-Gauss-Bonnet action for gravity, which is constructed as the dimensional continuation of the Chern-Weil theorem, and such that the extremization of the full action yields the equations of motion when Dirichlet boundary conditions are imposed. When translated into tensorial language, this boundary term is the generalization to this theory of the Katz boundary term and vector for general relativity. The construction allows to deal with a general background and includes the Gibbons-Hawking-Myers boundary term as a special case, when the background is tak…
Instead of the work \cite{1} which in according to the Lovelock theorem it could not applicable for all types of 4D curved spacetimes of Einstein Gauss Bonnet (EGB) gravity, authors of the work \cite{2} applied break of diffeomorphism property to present a consistent EGB gravity theory. In this work we use the latter model by adding a nonlinear electromagnetic field lagrangian density to study affects of GB coupling constant into the thermodynamic phase transition and Joule Thomson (JT) adiabatic expansion of a 4D $dS/AdS$ GB Bardeen black hole.
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