Wed·Aug 9, 2023Wednesday·August 9, 2023

1. 01*

   CaloScore v2: Single-shot Calorimeter Shower Simulation with Diffusion Models

   Vinicius Mikuni🇺🇸 · Benjamin Nachman🇺🇸

   Diffusion generative models are promising alternatives for fast surrogate models, producing high-fidelity physics simulations. However, the generation time often requires an expensive denoising process with hundreds of function evaluations, restricting the current applicability of these models in a realistic setting. In this work, we report updates on the CaloScore architecture, detailing the changes in the diffusion process, which produces higher quality samples, and the use of progressive distillation, resulting in a diffusion model capable of generating new samples with a single function evaluation. We demonstrate these improvements using the Calorimeter Simulation Challenge 2022 dataset.

   hep-phhep-exphysics.ins-detJINST(2024)·66 citations
2. 02*

   One-loop Effective Action up to Dimension Eight: Integrating out Heavy Fermion(s)

   Joydeep Chakrabortty🇮🇳 · Shakeel Ur Rahaman🇮🇳 · Kaanapuli Ramkumar🇮🇳

   We present the universal one-loop effective action up to dimension eight after integrating out heavy fermion(s) using the Heat-Kernel method. We have discussed how the Dirac operator being a weak elliptic operator, the fermionic operator still can be written in the form of a strong elliptic one such that the Heat-Kernel coefficients can be used to compute the fermionic effective action. This action captures the footprint of both the CP conserving as well as violating UV interactions. As it does not rely on the specific forms of either UV or low energy theories, can be applicable for a very generic action. Our result encapsulates the effects of heavy fermion loops only.

   hep-phhep-thNPB(2024)·25 citations
3. 03*

   A natural QCD infrared cutoff

   A. A. Natale🇧🇷

   We briefly discuss some results obtained recently about dynamical gluon mass generation. We comment that this mass provides a natural QCD infrared cutoff and also implies an infrared finite coupling constant. We also discuss the phenomenological applications of these results and how they can be treated in the context of the so-called Dynamical Perturbation Theory.

   hep-ph0 citations
4. 04*

   The $\mathcal{O}({\alpha }_t+{\alpha }_{\lambda }+{\alpha }_{\kappa }{)}^2$ Correction to the $\rho$ Parameter and its Effect on the W Boson Mass Calculation in the Complex NMSSM

   Thi Nhung Dao🇻🇳 · Martin Gabelmann🇩🇪 · M. Margarete Mühlleitner🇩🇪

   We present the prediction of the electroweak $\rho$ parameter and the $W$ boson mass in the CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM) at the two-loop order. The $\rho$ parameter is calculated at the full one-loop and leading and sub-leading two-loop order $\mathcal{O}(\alpha +{\alpha }_t{\alpha }_s+{\left({\alpha }_t+{\alpha }_{\lambda }+{\alpha }_{\kappa }\right)}^2)$. The new $\Delta \rho$ prediction is incorporated into a prediction of $M_W$ via a full supersymmetric (SUSY) one-loop calculation of $\Delta r$. Furthermore, we include all known state-of-the-art SM higher-order corrections to $\Delta r$. By comparing results for $\Delta \rho$ obtained using on-shell (OS) and $\overline{\mathrm{DR}}$ renormalization conditions in the top/stop sector, we find that the scheme uncertainty is reduced at one-loop order by 55%, at two-loop $\mathcal{O}({\alpha }_s{\alpha }_t)$ by 22%, and at two-loop $\mathcal{O}({\alpha }_t+{\alpha }_{\kappa }+{\alpha }_{\lambda }{)}^2$ by 16%, respectively. The influence of the two-loop results on the $M_W$ mass prediction is found to be sub-leading. The new calculation is made public in the computer program $\mathtt{NMSSMCALC}$. We perform an extensive comparison in the $W$-mass, Higgs boson mass and the muon anomalous magnetic moment prediction between our calculation and three other publicly available tools and find very good agreement provided that the input parameters and renormalization scales are treated in the same way. Finally, we study the impact of the CP-violating phases on the $W$-mass prediction which is found to be smaller than the overall size of the SUSY corrections.

   hep-phEPJC(2023)·6 citations
5. 05*

   Intermediate Charge-Breaking Phases and Symmetry Non-Restoration in the 2-Higgs-Doublet Model

   Mayumi Aoki🇯🇵 · Lisa Biermann🇩🇪 · Christoph Borschensky🇩🇪 · Igor P. Ivanov🇨🇳 · Margarete Mühlleitner🇩🇪 · Hiroto Shibuya🇯🇵

   The Higgs potentials of extended Higgs sectors exhibit a complex and interesting vacuum structure. When travelling back in time, i.e. going to higher temperatures, the structure may change and exhibit interesting phase patterns and sequences of phases related to the respective minima of the potential. The investigation of the vacuum structure can give us indirect insights in beyond-Standard-Model physics and the evolution of the Universe. In this paper, we investigate the possibility of an intermediate charge-breaking (CB) phase in the 2-Higgs-Doublet Model (2HDM) type I. The existence has been reported previously by using a simple potential setup. We here confirm that the intermediate CB phase can still exist when using the one-loop corrected effective potential including thermal masses. We discuss its features and the relation with SU(2) symmetry (non-)restoration as well as its consistency with the current experimental data. Lastly, we show for some selected benchmark points the rich and interesting phase patterns and sequences that the 2HDM can undergo during its evolution from the early Universe to today's electroweak vacuum.

   hep-phJHEP(2024)·13 citations
6. 06*

   Puzzles in the hadronic contributions to the muon anomalous magnetic moment

   Gilberto Colangelo🇨🇭 · Martin Hoferichter🇨🇭 · Peter Stoffer🇨🇭

   We summarize recent developments in the Standard-Model evaluation of the anomalous magnetic moment of the muon $a_{\mu }$, both in the hadronic-light-by-light and hadronic-vacuum-polarization contributions. The current situation for the latter is puzzling as we are confronted with multiple discrepancies that are not yet understood. We present updated fits of a dispersive representation of the pion vector form factor to the new CMD-3 data set and quantify the tensions with the other high-statistics $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ experiments in the contribution to $a_{\mu }$ in the energy range up to 1 GeV, as well as in the corresponding contribution to the intermediate Euclidean window.

   hep-phhep-exhep-latnucl-thJINST(2023)·46 citations
7. 07*

   Hadronic vacuum polarization: comparing lattice QCD and data-driven results in systematically improvable ways

   Michel Davier🇫🇷 · Zoltan Fodor🇩🇪 · Antoine Gerardin🇫🇷 · Laurent Lellouch🇫🇷 · Bogdan Malaescu🇫🇷 · Finn M. Stokes🇩🇪 · Kalman K. Szabo🇩🇪 · Balint C. Toth🇩🇪 · Lukas Varnhorst🇩🇪 · Zhiqing Zhang🇫🇷

   The precision with which hadronic vacuum polarization (HVP) is obtained determines how accurately important observables, such as the muon anomalous magnetic moment, a_\mu, or the low-energy running of the electromagnetic coupling, \alpha, are predicted. The two most precise approaches for determining HVP are: dispersive relations combined with e+e- to hadrons cross-section data, and lattice QCD. However, the results obtained in these two approaches display significant tensions, whose origins are not understood. Here we present a framework that sheds light on this issue and, if the two approaches can be reconciled, allows them to be combined. Via this framework, we test the hypothesis that the tensions can be explained by modifying the R-ratio in different intervals of center-of-mass energy sqrt(s). As ingredients, we consider observables that have been precisely determined in both approaches. These are the leading hadronic contributions to a_\mu, to the so-called intermediate window observable and to the running of \alpha between spacelike virtualities 1GeV^2 and 10GeV^2 (for which only a preliminary lattice result exists). Our tests take into account all uncertainties and correlations, as well as uncertainties on uncertainties in the lattice results. Among our findings, the most striking is that results obtained in the two approaches can be made to agree for all three observables by modifying the \rho peak in the experimental spectrum. In particular, we find that this requires a common ~5\% increase in the contributions of the peak to each of the three observables. This finding is robust against the presence or absence of one of the constraining observables. However, such an increase is much larger than the uncertainties on the measured R-ratio. We also discuss a variety of generalizations of the methods used here, as well as the limits in the information that can be extracted...

   hep-phhep-exhep-latPRD(2024)·45 citations
8. 08*

   Kinematic twist-three contributions to pseudo- and quasi-GPDs and translation invariance

   V.M. Braun🇩🇪

   We present explicit expressions for the tree-level "kinematic" twist-three contributions to the nucleon matrix elements of gauge-invariant nonlocal quark-antiquark operators which can be used in lattice calculations of generalized parton distributions (GPDs). These contributions in particular restore the translation invariance of the results up to higher twist four. The calculated twist-three corrections are logarithmically enhanced as compared to the leading twist, and are discontinuous at the kinematic points $x=\pm \xi$.

   hep-phhep-latJHEP(2023)·11 citations
9. 09*

   Double-gluon charmonium hybrid states with various (exotic) quantum numbers

   Niu Su🇨🇳 · Hua-Xing Chen🇨🇳 · Wei Chen🇨🇳 · Shi-Lin Zhu🇨🇳

   We study the double-gluon charmonium hybrid states with various quantum numbers, each of which is composed of one valence charm quark and one valence charm antiquark as well as two valence gluons. We concentrate on the exotic quantum numbers $J^{PC}=0^{--}/0^{+-}/1^{-+}/2^{+-}/3^{-+}$ that the conventional $\bar{q}q$ mesons can not reach. We apply the QCD sum rule method to calculate their masses to be $7.28_{-0.43}^{+0.38}$ GeV, $5.19_{-0.46}^{+0.36}$ GeV, $5.46_{-0.62}^{+0.41}$ GeV, $4.48_{-0.31}^{+0.25}$ GeV, and $5.54_{-0.43}^{+0.35}$ GeV, respectively. We study their possible decay patterns and propose to search for the $J^{PC}=2^{+-}/3^{-+}$ states in the $D^{\ast }{\bar{D}}^{(\ast )}/D_s^{\ast }{\bar{D}}_s^{(\ast )}/{\Sigma }_c^{\ast }{\bar{\Sigma }}_c^{(\ast )}/{\Xi }_c^{\ast }{\bar{\Xi }}_c^{(\prime ,\ast )}$ channels. Experimental investigations on these states and decay channels can be useful in classifying the nature of the hybrid state, thus serving as a direct test of QCD in the low energy sector.

   hep-phhep-exhep-latPRD(2024)·3 citations
10. 10*

    Looking for an axion in a haystack of muons

    A. Gurgone (on behalf of the McMule team)🇮🇹

    The search for axion-like particles $X$ in muon decays is an excellent opportunity for the MEG II and Mu3e experiments to extend their horizons beyond ${\mu }^{+}\to e^{+}\gamma$ and ${\mu }^{+}\to e^{+}{e}^{-}{e}^{+}$. A suitable process for both experiments is the two-body decay ${\mu }^{+}\to e^{+}X$, whose only signature is a monochromatic peak close to the kinematic endpoint of the positron energy spectrum of the ${\mu }^{+}\to e^{+}{\nu }_e{\bar{\nu }}_{\mu }$ background. The hunt for such an elusive signal in a vast amount of irreducible background requires extremely accurate theoretical predictions to be implemented in a Monte Carlo event generator. This work presents a new state-of-the-art computation of ${\mu }^{+}\to e^{+}{\nu }_e{\bar{\nu }}_{\mu }$ for polarised muons, accomplished with the McMule framework. The calculation includes next-to-next-leading order QED corrections and logarithmically enhanced terms at even higher orders. The results are also used to estimate the sensitivity of both experiments on the branching ratio of ${\mu }^{+}\to e^{+}X$, in order to evaluate the impact of the theoretical error.

    hep-phhep-exJINST(2023)·2 citations
11. 11*

    New determination of $|V_{ub}/V_{cb}|$ from $B_s^0\to \{K^{-},D_s^{-}\}{\mu }^{+}\nu$

    Carolina Bolognani🇳🇱 · Danny van Dyk🇬🇧 · K. Keri Vos🇳🇱

    We update the full set of ${\bar{B}}_s\to K$ form factors using light-cone sum rules with an on-shell kaon. Our approach determines the relevant sum rule parameters -- the duality thresholds -- from a Bayesian fit for the first time. Using a modified version of the Boyd-Grinstein-Lebed parametrisation, we combine our sum rule results at low momentum transfer $q^2$ with more precise lattice QCD results at large $q^2$. We obtain a consistent description of the form factors in the full $q^2$ range. Applying these results to a recent LHCb measurement of branching ratios for the decays $B_s^0\to \{K^{-},D_s^{-}\}{\mu }^{+}{\nu }_{\mu }$, we determine the ratio of Cabibbo-Kobayashi-Maskawa elements $${\left|\frac{V_{ub}}{V_{cb}}\right|}_{q^2<7{\text{GeV}}^2}=0.0681\pm 0.0040\text{and}{\left|\frac{V_{ub}}{V_{cb}}\right|}_{q^2>7{\text{GeV}}^2}=0.0801\pm 0.0047,$$ which are mutually compatible at the $1.9\sigma$ level. We further comment on the sensitivity to Beyond the Standard Model effects through measurements of the shape of $B_s^0\to K^{-}{\mu }^{+}{\nu }_{\mu }$ decays, in light of recent limits on such effects from other exclusive $b\to u\ell \nu$ processes.

    hep-phJHEP(2023)·10 citations
12. 12*

    Heavy quarkonia in QGP medium in an arbitrary magnetic field

    Jobin Sebastian🇮🇳 · Lata Thakur🇰🇷 · Hiranmaya Mishra🇮🇳 · Najmul Haque🇮🇳

    We compute the heavy quarkonium complex potential in an arbitrary magnetic field strength generated in the relativistic heavy-ion collision. First, the one-loop gluon polarization tensor is obtained in the presence of an external, constant, and homogeneous magnetic field using the Schwinger proper time formalism in Euclidean space. The gluon propagator is computed from the gluon polarization tensor, and it is used to calculate the dielectric permittivity in the presence of the magnetic field in the static limit. The modified dielectric permittivity is then used to compute the heavy quarkonium complex potential. We find that the heavy quarkonium complex potential is anisotropic in nature, which depends on the angle between the quark-antiquark ($Q\bar{Q}$) dipole axis and the direction of the magnetic field. We discuss the effect of the magnetic field strength and the angular orientation of the dipole on the heavy quarkonium potential. We discuss how the magnetic field influences the thermal widths of quarkonium states. Further, we also discuss the limitation of the strong-field approximation as done in literature in the light of heavy-ion observables, as the effect of the magnetic field is very nominal to the quarkonium potential.

    hep-phPRD(2023)·11 citations
13. 13*

    Denoising diffusion models with geometry adaptation for high fidelity calorimeter simulation

    Oz Amram🇺🇸 · Kevin Pedro🇺🇸

    Simulation is crucial for all aspects of collider data analysis, but the available computing budget in the High Luminosity LHC era will be severely constrained. Generative machine learning models may act as surrogates to replace physics-based full simulation of particle detectors, and diffusion models have recently emerged as the state of the art for other generative tasks. We introduce CaloDiffusion, a denoising diffusion model trained on the public CaloChallenge datasets to generate calorimeter showers. Our algorithm employs 3D cylindrical convolutions, which take advantage of symmetries of the underlying data representation. To handle irregular detector geometries, we augment the diffusion model with a new geometry latent mapping (GLaM) layer to learn forward and reverse transformations to a regular geometry that is suitable for cylindrical convolutions. The showers generated by our approach are nearly indistinguishable from the full simulation, as measured by several different metrics.

    ↳ physics.ins-dethep-exhep-phphysics.data-anPRD(2023)·77 citations
14. 14*

    Liouvillian Dynamics of the Open Schwinger Model: String Breaking and Kinetic Dissipation in a Thermal Medium

    Kyle Lee🇺🇸 · James Mulligan🇺🇸 · Felix Ringer🇺🇸 · Xiaojun Yao🇺🇸

    Understanding the dynamics of bound state formation is one of the fundamental questions in confining quantum field theories such as Quantum Chromodynamics (QCD). One hadronization mechanism that has garnered significant attention is the breaking of a string initially connecting a fermion and an anti-fermion. Deepening our understanding of real-time string-breaking dynamics with simpler, lower dimensional models like the Schwinger model can improve our understanding of the hadronization process in QCD and other confining systems found in condensed matter and statistical systems. In this paper, we consider the string-breaking dynamics within the Schwinger model and investigate its modification inside a thermal medium, treating the Schwinger model as an open quantum system coupled to a thermal environment. Within the regime of weak coupling between the system and environment, the real-time evolution of the system can be described by a Lindblad evolution equation. We analyze the Liouvillian gaps of this Lindblad equation and the time dependence of the system's von Neumann entropy. We observe that the late-time relaxation rate decreases as the environment correlation length increases. Moreover, when the environment correlation length is infinite, the system exhibits two steady states, one in each of the sectors with definite charge-conjugation-parity (CP) quantum numbers. For parameter regimes where an initial string breaks in vacuum, we observe a delay of the string breaking in the medium, due to kinetic dissipation effects. Conversely, in regimes where an initial string remains intact in vacuum time evolution, we observe string breaking (melting) in the thermal medium. We further discuss how the Liouvillian dynamics of the open Schwinger model can be simulated on quantum computers and provide an estimate of the associated Trotter errors.

    ↳ quant-phhep-lathep-phnucl-thPRD(2023)·38 citations
15. 15*

    First application of a liquid argon time projection chamber for the search for intranuclear neutron-antineutron transitions and annihilation in ${}^{40}$Ar using the MicroBooNE detector

    MicroBooNE collaboration: P. Abratenko · O. Alterkait · D. Andrade Aldana · L. Arellano · J. Asaadi · A. Ashkenazi · S. Balasubramanian · B. Baller · G. Barr · D. Barrow · J. Barrow · V. Basque and 176 other authors

    We present a novel methodology to search for intranuclear neutron-antineutron transition ($n\to \bar{n}$) followed by $\bar{n}$-nucleon annihilation within an ${}^{40}$Ar nucleus, using the MicroBooNE liquid argon time projection chamber (LArTPC) detector. A discovery of $n\to \bar{n}$ transition or a new best limit on the lifetime of this process would either constitute physics beyond the Standard Model or greatly constrain theories of baryogenesis, respectively. The approach presented in this paper makes use of deep learning methods to select $n\to \bar{n}$ events based on their unique features and differentiate them from cosmogenic backgrounds. The achieved signal and background efficiencies are (70.22$\pm$6.04)\% and (0.0020$\pm$0.0003)\%, respectively. A demonstration of a search is performed with a data set corresponding to an exposure of $3.32\times 10^{26}$neutron-years, and where the background rate is constrained through direct measurement, assuming the presence of a negligible signal. With this approach, no excess of events over the background prediction is observed, setting a demonstrative lower bound on the $n\to \bar{n}$ lifetime in ${}^{40}$Ar of ${\tau }_{\text{m}}\gtrsim 1.1\times 10^{26}$years, and on the free $n\to \bar{n}$ transition time of ${\tau }_{\text{nnbar}}\gtrsim 2.6\times 10^5$s, each at the $90\%$ confidence level. This analysis represents a first-ever proof-of-principle demonstration of the ability to search for this rare process in LArTPCs with high efficiency and low background.

    ↳ hep-exhep-phJINST(2024)·9 citations
16. 16*

    Neutrinos and nucleosynthesis of elements

    Tobias Fischer🇵🇱 · Gang Guo🇨🇳 · Karlheinz Langanke🇩🇪 · Gabriel Martinez-Pinedo🇩🇪 · Yong-Zhong Qian🇺🇸 · Meng-Ru Wu🇹🇼

    Neutrinos are known to play important roles in many astrophysical scenarios from the early period of the big bang to current stellar evolution being a unique messenger of the fusion reactions occurring in the center of our sun. In particular, neutrinos are crucial in determining the dynamics and the composition evolution in explosive events such as core-collapse supernovae and the merger of two neutron stars. In this paper, we review the current understanding of supernovae and binary neutron star mergers by focusing on the role of neutrinos therein. Several recent improvements on the theoretical modeling of neutrino interaction rates in nuclear matter as well as their impact on the heavy element nucleosynthesis in the supernova neutrino-driven wind are discussed, including the neutrino-nucleon opacity at the mean field level taking into account the relativistic kinematics of nucleons, the effect due to the nucleon-nucleon correlation, and the nucleon-nucleon bremsstrahlung. We also review the framework used to compute the neutrino-nucleus interactions and the up-to-date yield prediction for isotopes from neutrino nucleosynthesis occurring in the outer envelope of the supernova progenitor star during the explosion. Here improved predictions of energy spectra of supernova neutrinos of all flavors have had significant impact on the nucleosynthesis yields. Rapid progresses in modeling the flavor oscillations of neutrinos in these environments, including several novel mechanisms for collective neutrino oscillations and their potential impacts on various nucleosynthesis processes are summarized.

    ↳ astro-ph.HEastro-ph.SRhep-phnucl-thPPNP(2024)·68 citations
17. 17*

    Scalable Circuits for Preparing Ground States on Digital Quantum Computers: The Schwinger Model Vacuum on 100 Qubits

    Roland C. Farrell🇺🇸 · Marc Illa🇺🇸 · Anthony N. Ciavarella🇺🇸 · Martin J. Savage🇺🇸

    The vacuum of the lattice Schwinger model is prepared on up to 100 qubits of IBM's Eagle-processor quantum computers. A new algorithm to prepare the ground state of a gapped translationally-invariant system on a quantum computer is presented, which we call Scalable Circuits ADAPT-VQE (SC-ADAPT-VQE). This algorithm uses the exponential decay of correlations between distant regions of the ground state, together with ADAPT-VQE, to construct quantum circuits for state preparation that can be scaled to arbitrarily large systems. These scalable circuits can be determined using classical computers, avoiding the challenging task of optimizing parameterized circuits on a quantum computer. SC-ADAPT-VQE is applied to the Schwinger model, and shown to be systematically improvable, with an accuracy that converges exponentially with circuit depth. Both the structure of the circuits and the deviations of prepared wavefunctions are found to become independent of the number of spatial sites, $L$. This allows for a controlled extrapolation of the circuits, determined using small or modest-sized systems, to arbitrarily large $L$. The circuits for the Schwinger model are determined on lattices up to $L=14$ (28 qubits) with the qiskit classical simulator, and subsequently scaled up to prepare the $L=50$ (100 qubits) vacuum on IBM's 127 superconducting-qubit quantum computers ibm_brisbane and ibm_cusco. After introducing an improved error-mitigation technique, which we call Operator Decoherence Renormalization, the chiral condensate and charge-charge correlators obtained from the quantum computers are found to be in good agreement with classical Matrix Product State simulations.

    ↳ quant-phhep-lathep-phnucl-thPRX Quantum(2024)·269 citations
18. 18*

    Hadrons in (1+1)D Hamiltonian hardcore lattice QCD

    Marco Rigobello🇮🇹 · Giuseppe Magnifico🇮🇹 · Pietro Silvi🇮🇹 · Simone Montangero🇮🇹

    We study 2-flavor Hamiltonian lattice QCD in (1+1)D with hardcore gluons, at zero and finite density, by means of matrix product states. We introduce a formulation of the theory where gauge redundancy is absent and construct a gauge invariant tensor network ansatz. We show that the model is critical in an extended subregion of parameter space and identify at least two distinct phases, one of which embeds the continuum limit location. We reconstruct a subset of the particle spectrum in each phase, identifying edge and bulk gapless modes. We thereby show that the studied model provides a minimal SU(3) gauge theory whilst reproducing known phenomena of (3+1)D QCD. Most notably, it features charged pions.

    ↳ hep-latcond-mat.str-elhep-phphysics.comp-ph+127 citations
19. 19*

    Hydrodynamic and Non-hydrodynamic Excitations in Kinetic Theory -- A Numerical Analysis in Scalar Field Theory

    Stephan Ochsenfeld🇩🇪 · Sören Schlichting🇩🇪

    Viscous hydrodynamics serves as a successful mesoscopic description of the Quark-Gluon Plasma produced in relativistic heavy-ion collisions. In order to investigate, how such an effective description emerges from the underlying microscopic dynamics we calculate the hydrodynamic and non-hydrodynamic modes of linear response in the sound channel from a first-principle calculation in kinetic theory. We do this with a new approach wherein we discretize the collision kernel to directly calculate eigenvalues and eigenmodes of the evolution operator. This allows us to study the Green's functions at any point in the complex frequency space. Our study focuses on scalar theory with quartic interaction and we find that the analytic structure of Green's functions in the complex plane is far more complicated than just poles or cuts which is a first step towards an equivalent study in QCD kinetic theory.

    ↳ hep-thhep-phnucl-thJHEP(2023)·28 citations
20. 20*

    Kerr-Newman and Electromagnetic acceleration

    Paul H. Frampton🇮🇹

    Previous discussions of charged dark matter neglected PBH spin and employed the Reissner-Nordstrom metric. In Nature we expect the PBHs to possess spin which require use of the technically more challenging Kerr-Newman metric. It is shown that the use of K-N metric retains the principal properties already obtained using the R-N metric, in particular the dominance of Coulomb repulsion requires super-extremality and the presence of naked singularities. In this sense, the spin of the PBHs is not an essential complication.

    ↳ gr-qcastro-ph.COhep-ph1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.