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The pseudospectrum and spectrum (in)stability of quantum corrected Schwarzschild black hole

Science China(physics,Mechanics & Astronomy) 2024年第10期Mechanics & Astronomy) .卷 59-79页

作者： Li-Ming Cao Jia-Ning Chen Liang-Bi Wu Libo Xie Yu-Sen Zhou Peng Huanwu Center for fundamental Theory Interdisciplinary Center for Theoretical study and Department of Modern physics University of Science and Technology of China school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCAS

In this study, we investigate the pseudospectrum and spectrum(in)stability of quantum corrected Schwarzschild black ***, we use the hyperboloidal framework to cast the quasinormal mode(QNM) problem into an eigenvalue problem associated with a non-selfadjoint operator, and then the spectrum and pseudospectrum are depicted. Besides, the invariant subspace method is exploited to improve the computational efficiency for pseudospectrum. The investigation into the spectrum(in)stability entails two main aspects. On the one hand, we calculate the spectra of the quantum corrected black hole, then by the means of the migration ratio, the impact of the quantum correction effect on the Schwarzschild black hole has been *** results indicate that the so-called “migration ratio instability” will occur for small black holes with small angular momentum number l. In the eikonal limit, the migration ratios remain the same for each overtone. On the other hand, we study the spectrum(in)stability of the quantum corrected black hole by directly adding some particular perturbations into the effective potential,where perturbations are located at the event horizon and null infinity, respectively. There are two interesting observations under the same perturbation energy norm. First, perturbations at infinity are more capable of generating spectrum instability than those at the event horizon. Second, we find that the peak distribution can lead to the instability of QNM spectrum more efficiently than the average distribution.

关键词： quasinormal modes pseudospectrum hyperboloidal coordinate

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Color-kinematics duality and dual conformal symmetry for a four-loop form factor in N=4 SYM

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Science China(physics,Mechanics & Astronomy) 2024年第4期67卷 64-71页

作者： Guanda Lin Gang Yang Siyuan Zhang CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China school of Physical sciences University of Chinese Academy of SciencesBeijing 100049China school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical physics Asia-Pacific Beijing/Hangzhou 310024China

We obtain the integrand of full-color four-loop three-point form factor of the stress-tensor supermultiplet in N=4 SYM,based on the color-kinematics(CK)duality and generalized unitarity *** result not only manifests all dual Jacobi relations via CK duality but also contains 133 free *** suggests the constructibility of the form factor at even higher loops via CK *** also find that the planar form factor has a hidden dual conformal symmetry in the lightlike limit of the operator momentum,which is checked up to four loops.

关键词： S-matrix supersymmetric model perturbative calculations

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Research on light dark matter particle from evaporating primordial black hole in CDEX-10 experiment

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Science China(physics,Mechanics & Astronomy) 2024年第10期Mechanics & Astronomy) .卷 172-173页

作者： Qing-Guo Huang school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCAS CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences school of Physical sciences University of Chinese Academy of Sciences

Dark matter is an essential component of the universe, accounting for approximately 85% of all matter. However,what the nature of dark matter actually is remains a huge mystery. So far, all evidence for the existence of dark matter has come from gravitational interactions. Since gravitational interactions are universal, it is challenging to reveal the nature of dark matter through gravitational interactions. To unravel the mystery of dark matter, it is essential to directly detect dark matter.

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Symbology of Feynman integrals from twistor geometries

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Science China(physics,Mechanics & Astronomy) 2024年第3期67卷 44-59页

作者： Song He Jiahao Liu Yichao Tang Qinglin Yang school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China International Centre for Theoretical physics Asia-Pacific Beijing 100049 Peng Huanwu Center for fundamental Theory Hefei 230026China school of Physical sciences University of Chinese Academy of SciencesBeijing 100049China

We study the symbology of planar Feynman integrals in dimensional regularization by considering geometric configurations in momentum twistor space corresponding to their leading singularities(LS). Cutting propagators in momentum twistor space amounts to intersecting lines associated with loop and external dual momenta, including the special line associated with the point at infinity, which breaks dual conformal symmetry. We show that cross-ratios of intersection points on these lines, especially those on the infinity line, naturally produce symbol letters for Feynman integrals in D = 4-2∈, which include and generalize their LS. At one loop, we obtain all symbol letters using intersection points from quadruple cuts for integrals up to pentagon kinematics with two massive corners, which agree perfectly with canonical differential equation(CDE) results. We then obtain all two-loop letters, for up to four-mass box and one-mass pentagon kinematics, by considering more intersections arising from two-loop cuts. Finally we comment on how cluster algebras appear from this construction, and importantly how we may extend the method to non-planar integrals.

关键词： Feynman integrals symbol letters twistor geometry

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Post-Newtonian binary dynamics in the effective field theory of Horndeskigravity

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Chinese physics C 2024年第3期48卷 180-190页

作者：武文浩汤勇 school of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyChinese Academy of SciencesHangzhou 310024China International Center for Theoretical physics Asia-Pacific Beijing 100049China

General relativity has been very successful since its proposal more than a century ***,various cosmological observations and theoretical consistency still motivate us to explore extended gravity *** gravity stands out as one attractive theory by introducing only one scalar *** we formulate the post-Newtonian effective field theory of Horndeski gravity and investigate the conservative dynamics of inspiral compact binary *** calculate the leading effective Lagrangian for a compact binary and obtain the periastron advance per *** particular,we apply our analytical calculation to two binary systems,PSR B 1534+12 and PSR J0737-3039,and constrain the relevant model *** theoretical framework can also be systematically extended to higherorders.

关键词： effective field theory modified gravity pulsar

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Observations on spontaneous chiral symmetry breaking and the mass gap of QCD in finite volume

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Communications in Theoretical physics 2024年第9期76卷 44-49页

作者： Xiaolan Meng Bolun Hu Yi-Bo Yang University of Chinese Academy of sciences School of Physical Sciences CAS Key Laboratory of Theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCAS International Centre for Theoretical physics Asia-Pacific

We present a lattice quantum chromodynamics(QCD) simulation with 2 + 1 + 1 flavor full QCD ensembles using near-physical quark masses and different spatial sizes L, at a ～ 0.055 *** results show that the scalar and pesudoscalar 2-point correlator with a valence pion mass of approximately 230 MeV become degenerated at L ≤ 1.0 fm, and such an observation suggests that the spontaneous chiral symmetry breaking disappears effectively at this point. At the same time, the mass gap between the nucleon and pion masses remains larger than ΛQCDin the entire L ∈ [0.2, 0.7] fm range.

关键词： chiral symmetry breaking confinement lattice QCD

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New signature of low mass Z'in J/ψdecays

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Chinese physics C 2024年第8期48卷 1-5页

作者： Chao-Qiang Geng Chia-Wei Liu Jiabao Zhang school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Tsung-Dao Lee institute&school of physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China institute of Theoretical physics University of Chinese Academy of SciencesBeijing 100190China

We explored a new approach to search for a low-mass Z′particle through J/ψdecays by identifying its existence through parity-violating phenomena in the isospin-violating final states ofΛΣ¯^(0)and the corresponding charge conjugated states ofΛΣ¯^(0).Our investigation centered on a generation-independent and leptophobic Z′with mass below 10 *** the present experimental conditions at Beijing Spectrometer III(BESIII)and the anticipated opportunities at the Super Tau Charm Factory(STCF),we conducted Monte-Carlo simulations to predict possible events at both ***,we foresee a substantial enhancement in the precision of the lower limit estimation ofαNP as well as a reduction in statistical uncertainty with upcoming STCF ***,it is essential to highlight that a null result in the measurement ofαNP would impose stringent constraints,requiring the Z′−q−q couplings to be in the order of 10^(−2).

关键词： Z′ parity violation J/ψ

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Time-reversal asymmetries in Λ_(b)→Λ(→pπ^(−))ℓ^(+)ℓ^(−)

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Chinese physics C 2024年第3期48卷 1-14页

作者：耿朝强刘佳韦魏正乙 school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China University of Chinese Academy of sciences Beijing 100190China CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

We study the decays ofΛb→Λ(→pπ^(−))ℓ^(+)ℓ^(−)withℓ=(e,μ,τ).We examine the full angular distributions with polarizedΛb,where the T-odd observables are *** discuss the possible effects of new physics(NP)and find that the T-odd observables are sensitive to them as they vanish in the standard *** attention is given to the interference of(pseudo)scalar operators with(axial)vector operators in polarized Λ_(b)→Λ(→pπ^(−))τ^(+)τ^(−),which are studied for the first *** effects are proportional to the lepton masses and therefore may evade the constraint from Λ_(b)→Λ(→pπ^(−))μ^(+)μ^(−) at the LHCb ***Λ_(b)→Λ(→pπ^(−))τ^(+)τ^(−) is uncontaminated by the charmonia resonance,it provides a clean background to probe *** addition,we show that the experimental central value of K10 in Λ_(b)→Λ(→pπ^(−))μ^(+)μ^(−) at the LHCb can be explained by the NP case,which couples to the right-handed quarks and *** polarization fraction of Λ_(b) at the LHCb is found to be consistent with zero regardless of the NP scenarios.

关键词： time reversal asymmetry angular distribution new physics T-odd correlation

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Accuracy of numerical relativity waveforms with respect to space-based gravitational wave detectors

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Communications in Theoretical physics 2024年第1期76卷 82-95页

作者： Zun Wang Junjie Zhao Zhoujian Cao institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China

As with the laser interferometer gravitational-wave observatory(LIGO),the matched filtering technique will be critical to the data analysis of gravitational wave detection by space-based detectors,including LISA,Taiji and *** templates are the basis for such matched filtering *** construct ready-to-use waveform templates,numerical relativity waveforms are a starting ***,the accuracy issue of numerical relativity waveforms is critically *** are many investigations regarding this issue with respect to *** unfortunately there are few results on this issue with respect to space-based *** current paper investigates this *** results indicate that the existing numerical relativity waveforms are as accurate as 99%with respect to space-based detectors,including LISA,Taiji and *** an accuracy level is comparable to that with respect to LIGO.

关键词： numerical relativity gravitational wave binary black hole

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Supermassive Primordial Black Holes for Nano-Hertz Gravitational Waves and High-redshift JWST Galaxies

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Research in Astronomy and Astrophysics 2024年第9期24卷 3-8页

作者： Hai-Long Huang Yong Cai Jun-Qian Jiang Jun Zhang Yun-Song Piao school of Physical sciences University of Chinese Academy of Sciences institute for Astrophysics School of Physics Zhengzhou University International Centre for Theoretical physics Asia-Pacific University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/hangzhou) University of Chinese Academy of Sciences school of fundamental physics and mathematical sciences Hangzhou Institute for Advanced Study UCAS institute of Theoretical physics Chinese Academy of Sciences

Recently, observational hints for supermassive black holes have been accumulating, prompting the question: Can primordial black holes（PBHs） be supermassive, particularly with masses M?10～9M⊙? A supercritical bubble,containing an inflating baby universe, that nucleated during inflation can evolve into a PBH in our observable universe. We find that when the inflaton slowly transitions past a neighboring vacuum, the nucleation rate of supercritical bubbles inevitably peaks, leading to a mass distribution of multiverse PBHs with a peak mass up to M?1011M⊙. Thus, our mechanism naturally provides a primordial origin for supermassive black holes.

关键词： (cosmology:) early universe (cosmology:) inflation (galaxies:) quasars: supermassive black holes

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