Jérémy Auffinger, Alexandre Arbey
We present the public code \texttt{BlackHawk}, a powerful tool to compute the evaporation of any distribution of Schwarzschild and Kerr Black Holes and the emission spectra of Hawking radiation.
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We describe BlackHawk, a public C program for calculating the Hawking evaporation spectra of any black hole distribution. This program allows the users to compute the primary and secondary spectra of stable or long-lived particles generated by Hawking radiation of the distribution of black holes, and to study their evolution in time. The physics of Hawking radiation is presented, and the capabilities, features and usage of BlackHawk are described here under the form of a manual. This is the BlackHawk v2.0 manual, which is available on the BlackHawk webpage http://blackhawk.hepforge.org/. A bri…
Hawking has proposed non-unitary rules for computing the probabilistic outcome of black hole formation. It is shown that the usual interpretation of these rules violates the superposition principle and energy conservation. Refinements of Hawking's rules are found which restore both the superposition principle and energy conservation, but leave completely unaltered Hawking's prediction of a thermal emission spectrum prior to the endpoint of black hole evaporation. These new rules violate clustering. They further imply the existence of superselection sectors, within each of which clustering is r…
In the companion paper [Phys. Rev. D 103 (2021) 10, [2101.02951]] we have derived the short-ranged potentials for the Teukolsky equations for massless spins $(0,1/2,1,2)$ in general spherically-symmetric and static metrics. Here we apply these results to numerically compute the Hawking radiation spectra of such particles emitted by black holes (BHs) in three different ansatz: charged BHs, higher-dimensional BHs, and polymerized BHs arising from models of quantum gravity. In order to ensure the robustness of our numerical procedure, we show that it agrees with newly derived analytic formulas fo…
Gravitational Waves from Primordial Black Hole Evaporation with Large Extra Dimensions
本文研究大额外维理论中超轻原初黑洞霍金蒸发产生的膜上局域化引力子发射，通过计算多自旋粒子的灰体因子及功率谱，发现其引力波峰值频率可降至亚MHz频段，处于未来高频探测器可探测范围内。
In this review, we describe recent progress on the black hole information problem that involves a new understanding of how to calculate the entropy of Hawking radiation. We show how the method for computing gravitational fine-grained entropy, developed over the past 15 years, can be extended to capture the entropy of Hawking radiation. This technique reveals large corrections needed for the entropy to be consistent with unitary black hole evaporation.
We employ a recently developed mode-sum regularization method to compute the renormalized stress-energy tensor of a quantum field in the Kerr background metric (describing a stationary spinning black hole). More specifically, we consider a minimally-coupled massless scalar field in the Unruh vacuum state, the quantum state corresponding to an evaporating black hole. The computation is done here for the case $a=0.7M$, using two different variants of the method: $t$-splitting and $φ$-splitting, yielding good agreement between the two (in the domain where both are applicable). We briefly discuss …
Black Hole Entropy and Planckian Discreteness
本文概述黑洞热力学性质，并从预言普朗克尺度离散性的量子引力视角探讨黑洞熵的微观来源、蒸发终态及信息疑难，回顾了熵计算的初步进展。
We show that highly spinning primordial black holes of mass $M\sim 10^{12}$ kg, potentially born in a matter-dominated era after inflation, can produce clouds of pions in their vicinity via the superradiant instability, with densities up to that of nuclear matter. We discuss the electromagnetic signatures of this process, via neutral pion decay and charged pion annihilation into photons, computing in particular their contribution to the isotropic gamma-ray background. This allows us to place upper bounds on the abundance of such primordial black holes that are comparable to the ones obtained f…
Regular Black Holes from Proper-Time flow in Quantum Gravity and their Quasinormal modes, Shadow and Hawking radiation
本文通过 proper-time 流出方法推导出规则黑洞，并研究其 quasinormal 模式、影及霍金辐射特性，揭示了奇点消除的物理结果。
Observations of gravitational waves provide new opportunities to study our Universe. In particular, mergers of stellar black holes are the main targets of the current gravitational wave experiments. In order to make accurate predictions, it is however necessary to simulate the mergers in numerical general relativity, which requires high performance computing. While scaling relations are used to rescale simulations for very massive black holes, primordial black holes have specific properties which can invalidate the rescaling. Similarly black holes in theories beyond Einstein's relativity can h…
Particle production, absorption, scattering, and geodesics in a Schwarzschild-Hernquist black hole
研究Schwarzschild黑洞嵌入Hernquist暗物质晕的量子和经典特征，分析粒子产生、吸收、散射及测地线特性。
Evaporating universes
本文通过扩展HRT公式并利用Brill-Lindquist虫洞构建全息模型，计算了渐近平直时空中蒸发黑洞的纠缠熵，发现其遵循Page曲线，支持信息守恒，并分析了虫洞内部曲面与解码复杂度。
Black Hole Radiation Sparsity and Bekenstein Entropy Loss in Non-Commutative Schwarzschild Spacetime
研究非对易引力框架下Schwarzschild黑洞的辐射稀疏性、Bekenstein熵损失和总粒子发射，发现辐射极稀疏且在蒸发末期发散。
Non-commutativity in Hayward spacetime
本文提出一种考虑非对易性修正的类Hayward黑洞解，基于非对易规范理论推导并分析了其视界结构、热力学、量子辐射、扰动、阴影及引力透镜，结合太阳系测试对参数给出了约束。
Quantum Black Holes and Gauge/Gravity Duality
本研究探讨量子引力中黑洞信息丢失悖论，通过AdS/CFT对应框架，结合广义纠缠熵、量子极值表面等方法，揭示信息恢复机制。
Universality, intertwiners and black hole information
本文利用代数方法与超选择扇区提出黑洞纠缠子，解释信息如何跨越黑洞大气层传至辐射并导出 Page 曲线，从而在无防火墙情形下维护幺正性。
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