Fri·May 29, 2020Friday·May 29, 2020

1. 01*

   QCD analysis of electromagnetic Dalitz decays $J/\psi \to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$

   Jun-Kang He🇨🇳 · Chao-Jie Fan🇨🇳

   The electromagnetic Dalitz decays $J/\psi \to {\eta }^{(\prime )}{e}^{+}{e}^{-}$ with large recoil momentum are studied in the framework of perturbative QCD. Meanwhile, the soft contributions from the small recoil momentum region are described by the overlap of soft wave functions, and the resonance contributions are estimated by the vector meson dominance model. Based on this dynamical picture, the transition form factors $f_{\psi {\eta }^{(\prime )}}(q^2)$ in full kinematic region are calculated for the first time, and we find that the transition form factors are insensitive to the shapes of ${\eta }^{(\prime )}$ distribution amplitudes. Our prediction of the normalized transition form factor $F_{\psi \eta }(q^2)\equiv f_{\psi \eta }(q^2)/f_{\psi \eta }(0)$ agrees well with its experimental data. In addition, we also find that the branching ratios $\mathcal{B}(J/\psi \to {\eta }^{(\prime )}{e}^{+}{e}^{-})$ are dominated by the contributions of perturbative QCD, and the resonance contributions are negligibly small as well as the soft contributions due to the suppression of the kinematic factor. With all these contributions, our results of the branching ratios $\mathcal{B}(J/\psi \to {\eta }^{(\prime )}{e}^{+}{e}^{-})$ and the ratio $R_{J/\psi }^e=\mathcal{B}(J/\psi \to \eta e^{+}{e}^{-})/\mathcal{B}(J/\psi \to {\eta }^{\prime }{e}^{+}{e}^{-})$ are in good agreement with their experimental data. Using the obtained $F_{\psi {\eta }^{(\prime )}}(q^2)$, we give the predictions of the branching ratios $\mathcal{B}(J/\psi \to {\eta }^{(\prime )}{\mu }^{+}{\mu }^{-})$ and their ratio $R_{J/\psi }^{\mu }$.

   hep-phPRD(2022)·7 citations
2. 02*

   A string landscape guide to soft SUSY breaking terms

   Howard Baer🇺🇸 · Vernon Barger🇺🇸 · Shadman Salam🇺🇸 · Dibyashree Sengupta🇺🇸

   We examine several issues pertaining to statistical predictivity of the string theory landscape for weak scale supersymmetry (SUSY). We work within a predictive landscape wherein super-renormalizable terms scan while renormalizable terms do not. We require stringy naturalness wherein the likelihood of values for observables is proportional to their frequency within a fertile patch of landscape including the MSSM as low energy effective theory with a pocket-universe value for the weak scale nearby to its measured value in our universe. In the string theory landscape, it is reasonable that the soft terms enjoy a statistical power-law draw to large values, subject to the existence of atoms as we know them (atomic principle). We argue that gaugino masses, scalar masses and trilinear soft terms should each scan independently. In addition, the various scalars should scan independently of each other unless protected by some symmetry. The expected non-universality of scalar masses-- once regarded as an undesirable feature-- emerges as an asset within the context of the string landscape picture. In models such as heterotic compactifications on Calabi-Yau manifolds, where the tree-level gauge kinetic function depends only on the dilaton, then gaugino masses may scale mildly, while scalar masses and A-terms, which depend on all the moduli, may scale much more strongly leading to a landscape solution to the SUSY flavor and CP problems in spite of non-diagonal Kähler metrics. We present numerical results for Higgs and sparticle mass predictions from the landscape within the generalized mirage mediation SUSY model and discuss resulting consequences for LHC SUSY and WIMP dark matter searches.

   hep-phPRD(2020)·24 citations
3. 03*

   Pseudoscalar pair production via off-shell Higgs in composite Higgs models

   Diogo Buarque Franzosi🇸🇪 · Gabriele Ferretti🇸🇪 · Li Huang🇺🇸 · Jing Shu🇨🇳

   We propose a new type of search for a pseudoscalar particle $\eta$ pair produced via an off-shell Higgs, $pp\to h^{\ast }\to \eta \eta$. The search is motivated by a composite Higgs model in which the $\eta$ is extremely narrow and decays almost exclusively into $Z\gamma$ in the mass range $65$ GeV$\lesssim m_{\eta }\lesssim 160$ GeV. We devise an analysis strategy to observe the novel $Z\gamma Z\gamma$ channel and estimate potential bounds on the Higgs-$\eta$ coupling. The experimental sensitivity to the signatures depends on the power to identify fake photons and on the ability to predict large photon multiplicities. This search allows us to exclude large values of the compositeness scale $f$, being thus complementary to other typical processes.

   hep-phSciPost Phys.(2020)·6 citations
4. 04*

   Exclusive four-pion photoproduction in ultra-peripheral heavy-ion collisions at RHIC and LHC energies

   Mariola Klusek-Gawenda🇵🇱 · J. Daniel Tapia Takaki🇺🇸

   We study the photoproduction of exclusive $2{\pi }^{+}2{\pi }^{-}$ mesons in ultra-peripheral heavy-ion collisions at RHIC and LHC energies. Predictions in photon-nucleus interactions are calculated for various resonances at central and forward rapidities. The recent H1 preliminary data are utilized to improve the description of the poorly known $\gamma p\to 4{\pi }^{\pm }p$ process. We present the comparisons of our results to the available STAR data at RHIC, and made predictions for LHC energies.

   hep-phhep-exActa Phys.Polon.B(2020)·8 citations
5. 05*

   Lepton dark matter portal in the inert Zee model

   Alexandra Gaviria🇨🇴 · Robinson Longas🇨🇴 · Andrés Rivera🇨🇴

   The inert Zee model is an extension of the Zee model for neutrino masses. This new model explains the dark matter relic abundance, generates a one-loop neutrino masses and forbids tree-level Higgs-mediated flavor changing neutral currents. Although the dark matter phenomenology of the model is similar to that of the inert doublet model, the presence of new vector-like fermions opens the lepton portal as a new dark matter annihilation channel. We study the impact of such a new portal in the low mass regime and show the parameter space allowed by direct and indirect searches of dark matter. Remarkably, we show that the region for $m_{H^0}\lesssim$ 70 GeV is recovered for ${\lambda }_L\lesssim 10^{-3}$. We also show that future experiments like LZ and DARWIN could test a large region of the parameter space of the model.

   hep-phInt.J.Mod.Phys.A(2020)·2 citations
6. 06*

   Quasi parton distribution functions at NNLO: flavor non-diagonal quark contributions

   Long-Bin Chen🇨🇳 · Wei Wang🇨🇳 · Ruilin Zhu🇨🇳

   We present a next-to-next-to-leading order (NNLO) calculation of the quasi parton distribution functions (Quasi-PDFs) in the large momentum effective theory (LaMET). We focus on the flavor non-diagonal quark-quark channel and demonstrate the LaMET factorization at the NNLO accuracy in the modified minimal subtraction scheme. The matching coefficient between the quasi-PDF and the light-cone PDF is derived. This provides a first step towards a complete NNLO analysis of quasi-PDFs and to better understand the nucleon structures from the first principle of QCD.

   hep-phhep-exhep-latnucl-ex+1PRD(2020)·38 citations
7. 07*

   Feeble neutrino portal dark matter at neutrino detectors

   Priyotosh Bandyopadhyay🇮🇳 · Eung Jin Chun🇰🇷 · Rusa Mandal🇩🇪

   We explore the neutrino portal dark matter (DM) at its minimum of field content having two dark sector particles coupled to a right-handed neutrino. Assuming the feeble nature of their interactions with the standard model (SM) particles, we analyze the freeze-in production of the observed DM relic density characterized by three different categories depending on the major production mechanisms. The portal provides interesting signatures at the neutrino detectors like KamLAND, Super-Kamiokande and IceCube, from a very late decay of the scalar DM to the fermion DM and the SM neutrino. Such neutrino flux spectrum from the cosmic and galactic origins can produce anomalous signals at future experiments.

   hep-phJCAP(2020)·39 citations
8. 08*

   Investigation of particle production in $h\text{-}A$ collisions using statistical distributions

   A. Kaur🇮🇳 · M. Kaur🇮🇳 · R. Aggarwal🇮🇳

   Study of the characteristic properties of charged particle production in hadron-nucleus collisions at high energies, by utilising the approaches from different statistical models is performed.~Predictions from different approaches using the Negative Binomial distribution, shifted Gompertz distribution, Weibull distribution and the Krasznovszky-Wagner distribution are utilised for a comparative study of the relative successes of these models.~These distributions derived from a variety of functional forms are based on either phenomenological parameterizations or some model of the underlying dynamics.~Some of these have have also been used to study the data at the LHC for both proton-proton and nucleus-nucleus collisions.~Various physical and derived observables have been used for the analysis.

   hep-phIJMPE(2021)·3 citations
9. 09*

   Matching the heavy-quark fields in QCD and HQET at four loops

   Andrey G. Grozin🇷🇺 · Peter Marquard🇩🇪 · Alexander V. Smirnov🇷🇺 · Vladimir A. Smirnov🇷🇺 · Matthias Steinhauser🇩🇪

   The QCD/HQET matching coefficient for the heavy-quark field is calculated up to four loops. It must be finite; this requirement produces analytical results for some terms in the four-loop on-shell heavy-quark field renormalization constant which were previously only known numerically. The effect of a non-zero lighter-flavor mass is calculated up to three loops. A class of on-shell integrals with two masses is analyzed in detail. By specifying our result to QED, we obtain the relation between the electron field and the Bloch--Nordsieck field with four-loop accuracy.

   hep-phPRD(2020)·8 citations
10. 10*

    Top Hadrons in Lorentz-Violating Field Theory

    Brett Altschul🇺🇸

    If there is Lorentz symmetry violation in the $t$ quark sector of the standard model, changes to particles' dispersion relations might allow for the existence of stable top-flavored hadrons. Observations of the survival of high-energy $\gamma$-rays over astrophysical distances can be used to place one-sided constraints on certain linear combinations of Lorentz violation coefficients in the $t$ sector at the $\sim 10^{-4}$ level of precision.

    hep-phhep-thPRD(2020)·4 citations
11. 11*

    Compact Halo around the Sun Accreted after Dark Matter Dissipative Self Interaction

    Ran Huo

    If dark matter particle can be decelerated due to its dissipative self scattering, except for sinking at the galaxy scale to speed up structure formation, it can also be accreted onto local celestial bodies such as the Sun, forming a compact halo. With some simplified assumptions we develop the Boltzmann equation set based on the partition function of the elliptical orbits, and numerically solve it for the accretion process. We find that the orbited dark matter particles will form a halo around the Sun, with the density profile well fitted to be proportional to $r^{-1.6}$ in a wide range of radius. While around the earth such local halo contribution is always several orders below the galactic component, in a very small region centered around the Sun the sunk dark matter particles can lead to a halo density several orders larger than the background galactic component, in particular in the parameter region of small deceleration speed and large cross section, which is still consistent with current constraints. Such potential dark matter local halo with significantly enhanced density will be a very interesting source for dark matter indirect detection if the corresponding channel exists, we discuss the possibility of the gamma-ray spectrum in the solar direction in some detail as an example.

    hep-phastro-ph.SR0 citations
12. 12*

    Fast flavor conversions in supernovae: the rise of mu-tau neutrinos

    Francesco Capozzi🇩🇪 · Madhurima Chakraborty🇮🇳 · Sovan Chakraborty🇮🇳 · Manibrata Sen🇺🇸

    Neutrinos in a core-collapse supernova can undergo fast flavor conversions with a possible impact on the explosion mechanism and nucleosynthesis. We perform the first non-linear simulations of fast conversions in the presence of three neutrino flavors. The recent supernova simulations with muon production call for such an analysis, as they relax the standard ${\nu }_{\mu ,\tau }={\bar{\nu }}_{\mu ,\tau }$ (two-flavor) assumption. Our results show the significance of muon and tau lepton number angular distributions, together with the traditional electron lepton number ones. Indeed, our three-flavor results are potentially very different from two-flavor ones. These results strengthen the need to further investigate the occurrence of fast conversions in supernova simulation data, including the degeneracy breaking of mu and tau neutrinos.

    hep-phastro-ph.HEastro-ph.SRPRL(2020)·80 citations
13. 13*

    Realistic GUT Yukawa Couplings from a Random Clockwork Model

    Gero von Gersdorff🇧🇷

    We present realistic models of flavor in SU(5) and SO(10) grand unified theories (GUTs). The models are renormalizable and do not require any exotic representations in order to accommodate the necessary GUT breaking effects in the Yukawa couplings. They are based on a simple clockwork Lagrangian whose structure is enforced with just two (one) vectorlike U(1) symmetries in the case of SU(5) and SO(10) respectively. The inter-generational hierarchies arise spontaneously from products of matrices with order one random entries.

    hep-phEPJC(2020)·10 citations
14. 14*

    Light- and strange-quark mass dependence of the $\rho (770)$ meson revisited

    R. Molina🇧🇷 · J. Ruiz de Elvira🇨🇭

    Recent lattice data on $\pi \pi$-scattering phase shifts in the vector-isovector channel, pseudoscalar meson masses and decay constants for strange-quark masses smaller or equal to the physical value allow us to study the strangeness dependence of these observables for the first time. We perform a global analysis on two kind of lattice trajectories depending on whether the sum of quark masses or the strange-quark mass is kept fixed to the physical point. The quark mass dependence of these observables is extracted from unitarized coupled-channel one-loop Chiral Perturbation Theory. This analysis guides new predictions on the $\rho (770)$ meson properties over trajectories where the strange-quark mass is lighter than the physical mass, as well as on the SU(3) symmetric line. As a result, the light- and strange-quark mass dependence of the $\rho (770)$ meson parameters are discussed and precise values of the Low Energy Constants present in unitarized one-loop Chiral Perturbation Theory are given. Finally, the current discrepancy between two- and three-flavor lattice results for the $\rho (770)$ meson is studied.

    ↳ hep-lathep-phJHEP(2020)·38 citations
15. 15*

    Inclusive semi-leptonic decays from lattice QCD

    Paolo Gambino🇮🇹 · Shoji Hashimoto🇯🇵

    We develop a method to compute inclusive semi-leptonic decay rate of hadrons fully non-perturbatively using lattice QCD simulations. The sum over all possible final states is achieved by a calculation of the forward-scattering matrix elements on the lattice, and the phase-space integral is evaluated using their dependence on the time separation between two inserted currents. We perform a pilot lattice computation for the B_s -> X_c l nu decay with an unphysical bottom quark mass and compare the results with the corresponding OPE calculation. The method to treat the inclusive processes on the lattice can be applied to other processes, such as the lepton-nucleon inelastic scattering.

    ↳ hep-lathep-phPRL(2020)·113 citations
16. 16*

    Light mesons within the basis light-front quantization framework

    Wenyang Qian (1)🇺🇸 · Shaoyang Jia (1)🇺🇸 · Yang Li (1 and 2)🇺🇸 · James P. Vary (1) ((1) Iowa State University, (2) University of Chinese Academy of Sciences)🇺🇸

    We study the light-unflavored mesons as relativistic bound states in the nonperturbative Hamiltonian formalism of the basis light-front quantization (BLFQ) approach. The dynamics for the valence quarks of these mesons is specified by an effective Hamiltonian containing the one-gluon exchange interaction and the confining potentials both introduced in our previous work on heavy quarkonia, supplemented additionally by a pseudoscalar contact interaction. We diagonalize this Hamiltonian in our basis function representation to obtain the mass spectrum and the light-front wave functions (LFWFs). Based on these LFWFs, we then study the structure of these mesons by computing the electromagnetic form factors, the decay constants, the parton distribution amplitudes (PDAs), and the parton distribution functions (PDFs). Our results are comparable to those from experiments and other theoretical models.

    ↳ nucl-thhep-phPRC(2020)·50 citations
17. 17*

    General formulation of cosmological perturbations in scalar-tensor dark energy coupled to dark matter

    Ryotaro Kase🇯🇵 · Shinji Tsujikawa🇯🇵

    For a scalar field $\varphi$ coupled to cold dark matter (CDM), we provide a general framework for studying the background and perturbation dynamics on the isotropic cosmological background. The dark energy sector is described by a Horndeski Lagrangian with the speed of gravitational waves equivalent to that of light, whereas CDM is dealt as a perfect fluid characterized by the number density $n_c$ and four-velocity $u_c^{\mu }$. For a very general interacting Lagrangian $f(n_c,\varphi ,X,Z)$, where $f$ depends on $n_c$, $\varphi$, $X=-{\partial }^{\mu }\varphi {\partial }_{\mu }\varphi /2$, and $Z=u_c^{\mu }{\partial }_{\mu }\varphi$, we derive the full linear perturbation equations of motion without fixing any gauge conditions. To realize a vanishing CDM sound speed for the successful structure formation, the interacting function needs to be of the form $f=-f_1(\varphi ,X,Z)n_c+f_2(\varphi ,X,Z)$. Employing a quasi-static approximation for the modes deep inside the sound horizon, we obtain analytic formulas for the effective gravitational couplings of CDM and baryon density perturbations as well as gravitational and weak lensing potentials. We apply our general formulas to several interacting theories and show that, in many cases, the CDM gravitational coupling around the quasi de-Sitter background can be smaller than the Newton constant $G$ due to a momentum transfer induced by the $Z$-dependence in $f_2$.

    ↳ gr-qcastro-ph.COhep-phhep-thJCAP(2020)·37 citations
18. 18*

    Finite-Density Massless Two-Color QCD at Isospin Roberge-Weiss Point and 't Hooft Anomaly

    Takuya Furusawa🇯🇵 · Yuya Tanizaki🇯🇵 · Etsuko Itou🇯🇵

    We study the phase diagram of two-flavor massless two-color QCD (QC${}_2$D) under the presence of quark chemical potentials and imaginary isospin chemical potentials. At the special point of the imaginary isospin chemical potential, called the isospin Roberge--Weiss (RW) point, two-flavor QC${}_2$D enjoys the ${\mathbb{Z}}_2$ center symmetry that acts on both quark flavors and the Polyakov loop. We find a ${\mathbb{Z}}_2$ 't Hooft anomaly of this system, which involves the ${\mathbb{Z}}_2$ center symmetry, the baryon-number symmetry, and the isospin chiral symmetry. Anomaly matching, therefore, constrains the possible phase diagram at any temperatures and quark chemical potentials at the isospin RW point, and we compare it with previous results obtained by chiral effective field theory and lattice simulations. We also point out an interesting similarity of two-flavor massless QC${}_2$D with $(2+1)$d quantum anti-ferromagnetic systems.

    ↳ hep-thcond-mat.str-elhep-lathep-ph+1PRResearch(2020)·10 citations
19. 19*

    Chiral Gravitational Waves Produced in a Helical Magnetogenesis Model

    So Okano🇯🇵 · Tomohiro Fujita🇯🇵

    We investigate the gravitational wave production induced by the primordial magnetic fields in a parity-violating magnetogenesis model. It is shown that the gravitational waves detectable by LISA, DECIGO or BBO and the magnetic fields strong enough to explain the blazar observation can be simultaneously produced. The magnetic fields and the gravitational waves have the same chirality and their amplitudes are related, which may also be tested by future observations.

    ↳ astro-ph.COgr-qchep-phJCAP(2021)·40 citations
20. 20*

    The double copy for heavy particles

    Kays Haddad🇩🇰 · Andreas Helset🇩🇰

    We show how to double-copy Heavy Quark Effective Theory (HQET) to Heavy Black Hole Effective Theory (HBET) for spin $s\le 1$. In particular, the double copy of spin-$s$ HQET with scalar QCD produces spin-$s$ HBET, while the double copy of spin-1/2 HQET with itself gives spin-1 HBET. Finally, we present novel all-order-in-mass Lagrangians for spin-1 heavy particles.

    ↳ hep-thgr-qchep-phPRL(2020)·73 citations
21. 21*

    Pion and Kaon Distribution Amplitudes in the Continuum Limit

    Rui Zhang🇺🇸 · Carson Honkala🇺🇸 · Huey-Wen Lin🇺🇸 · Jiunn-Wei Chen🇹🇼

    We present a lattice-QCD calculation of the pion, kaon and ${\eta }_s$ distribution amplitudes using large-momentum effective theory (LaMET). Our calculation is carried out using three ensembles with 2+1+1 flavors of highly improved staggered quarks (HISQ), generated by MILC collaboration, at 310 MeV pion mass with 0.06, 0.09 and 0.12 fm lattice spacings. We use clover fermion action for the valence quarks and tune the quark mass to match the lightest light and strange masses in the sea. The resulting lattice matrix elements are nonperturbatively renormalized in regularization-independent momentum-subtraction (RI/MOM) scheme and extrapolated to the continuum. We use two approaches to extract the $x$-dependence of the meson distribution amplitudes: 1) we fit the renormalized matrix elements in coordinate space to an assumed distribution form through a one-loop matching kernel; 2) we use a machine-learning algorithm trained on pseudo lattice-QCD data to make predictions on the lattice data. We found the results are consistent between these methods with the latter method giving a less smooth shape. Both approaches suggest that as the quark mass increases, the distribution amplitude becomes narrower. Our pion distribution amplitude has broader distribution than predicted by light-front constituent-quark model, and the moments of our pion distributions agree with previous lattice-QCD results using the operator production expansion.

    ↳ hep-lathep-phnucl-thPRD(2020)·95 citations
22. 22*

    Unified framework for Early Dark Energy from $\alpha$-attractors

    Matteo Braglia🇮🇹 · William T. Emond🇬🇧 · Fabio Finelli🇮🇹 · A. Emir Gumrukcuoglu🇬🇧 · Kazuya Koyama🇬🇧

    One of the most appealing approaches to ease the Hubble tension is the inclusion of an early dark energy (EDE) component that adds energy to the Universe in a narrow redshift window around the time of recombination and dilutes faster than radiation afterwards. In this paper, we analyze EDE in the framework of $\alpha$-attractor models. As well known, the success in alleviating the Hubble tension crucially depends on the shape of the energy injection. We show how different types of energy injections can be easily obtained, thanks to the freedom in choosing the functional form of the potential inspired by $\alpha$-attractor models. To confirm our intuition we perform an MCMC analysis for three representative cases and find indeed that $H_0$ is significantly larger than in $\Lambda$CDM like in other EDE models. Unlike axion-driven EDE models with super Planckian decay constant, the curvature of EDE models required by the data is natural in the context of recent theoretical developments in $\alpha$-attractors.

    ↳ astro-ph.COgr-qchep-phPRD(2020)·156 citations
23. 23*

    Astrophysical Implications of Neutron Star Inspiral and Coalescence

    John L. Friedman🇺🇸 · Nikolaos Stergioulas🇬🇷

    The first inspiral of two neutron stars observed in gravitational waves was remarkably close, allowing the kind of simultaneous gravitational wave and electromagnetic observation that had not been expected for several years. Their merger, followed by a gamma-ray burst and a kilonova, was observed across the spectral bands of electromagnetic telescopes. These GW and electromagnetic observations have led to dramatic advances in understanding short gamma-ray bursts; determining the origin of the heaviest elements; and determining the maximum mass of neutron stars. From the imprint of tides on the gravitational waveforms and from observations of X-ray binaries, one can extract the radius and deformability of inspiraling neutron stars. Together, the radius, maximum mass, and causality constrain the neutron-star equation of state, and future constraints can come from observations of post-merger oscillations. We selectively review these results, filling in some of the physics with derivations and estimates.

    ↳ astro-ph.HEgr-qchep-phnucl-thInt.J.Mod.Phys.D(2020)·26 citations
24. 24*

    Schwinger effect and false vacuum decay as quantum-mechanical tunneling of a relativistic particle

    Wen-Yuan Ai🇧🇪 · Marco Drewes🇧🇪

    We present a simple and intuitive description of both, the Schwinger effect and false vacuum decay through bubble nucleation, as tunneling problems in one-dimensional relativistic quantum mechanics. Both problems can be described by an effective potential that depends on a single variable of dimension length, which measures the separation of the particles in the Schwinger pair, or the radius of a bubble for the vacuum decay. We show that both problems can be described as tunneling in one-dimensional quantum mechanics if one interprets this variable as the position of a relativistic particle with a suitably defined effective mass. The same bounce solution can be used to obtain reliable order of magnitude estimates for the rates of the Schwinger pair production and false vacuum decay.

    ↳ hep-thhep-phPRD(2020)·22 citations
25. 25*

    Transport in strongly coupled quark matter

    Carlos Hoyos🇪🇸 · Niko Jokela🇫🇮 · Matti Jarvinen🇮🇱 · Javier G. Subils🇪🇸 · Javier Tarrio🇫🇮 · Aleksi Vuorinen🇫🇮

    Motivated by the possible presence of deconfined quark matter in neutron stars and their mergers and the important role of transport phenomena in these systems, we perform the first-ever systematic study of different viscosities and conductivities of dense quark matter using the gauge/gravity duality. Utilizing the V-QCD model, we arrive at results that are in qualitative disagreement with the predictions of perturbation theory, which highlights the differing transport properties of the system at weak and strong coupling and calls for caution in the use of the perturbative results in neutron-star applications.

    ↳ hep-thastro-ph.HEhep-phnucl-thPRL(2020)·42 citations

* 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.