Thu·Aug 16, 2018Thursday·August 16, 2018

1. 01*

   LHC luminosity and energy upgrades confront natural supersymmetry models

   Howard Baer🇺🇸 · Vernon Barger🇺🇸 · James S. Gainer🇺🇸 · Dibyashree Sengupta🇺🇸 · Hasan Serce🇺🇸 · Xerxes Tata🇺🇸

   The electroweak fine-tuning measure Delta(EW) allows for correlated SUSY soft terms as are expected in any ultra-violet complete theory. Requiring no less than 3% electroweak fine-tuning implies upper bounds of about 360~GeV on all higgsinos, while top squarks are lighter than ~3 TeV and gluinos are bounded by ~ 6-9 TeV. We examine the reach for SUSY of the planned high luminosity (HL: 3 ab^{-1} at 14 TeV) and the proposed high energy (HE: 15 ab^{-1} at 27 TeV) upgrades of the LHC via four LHC collider search channels relevant for natural SUSY: 1. gluino pair production followed by gluino decay to third generation (s)quarks, 2. top-squark pair production followed by decay to third generation quarks and light higgsinos, 3. neutral higgsino pair production with QCD jet radiation (resulting in monojet events with soft dileptons), and 4. wino pair production followed by decay to light higgsinos leading to same-sign diboson production. We confront our reach results with upper limits on superpartner masses in four natural SUSY models: natural gravity-mediation via the 1. two- and 2. three-extra-parameter non-universal Higgs models, 3. natural mini-landscape models with generalized mirage mediation and 4. natural anomaly-mediation. We find that while the HL-LHC can probe considerable portions of natural SUSY parameter space in all these models, the HE-LHC will decisively cover the entire natural SUSY parameter space with better than 3% fine-tuning.

   hep-phPRD(2018)·42 citations
2. 02*

   Dark matter bound states via emission of scalar mediators

   Ruben Oncala🇫🇷 · Kalliopi Petraki🇫🇷

   If dark matter (DM) couples to a force carrier that is much lighter than itself, then it may form bound states in the early universe and inside haloes. While bound-state formation via vector emission is known to be efficient and have a variety of phenomenological implications, the capture via scalar emission typically requires larger couplings and is relevant to more limited parameter space, due to cancellations in the radiative amplitude. However, this result takes into account only the trilinear DM-DM-mediator coupling. Theories with scalar mediators include also a scalar potential, whose couplings may participate in the radiative transitions. We compute the contributions of these couplings to the radiative capture, and determine the parameter space in which they are important.

   hep-phJHEP(2019)·33 citations
3. 03*

   Extended scalar sectors, effective operators and observed data

   Atri Dey🇮🇳 · Jayita Lahiri🇮🇳 · Biswarup Mukhopadhyaya🇮🇳

   The available data on the 125 GeV scalar $h$ is analysed to explore the room for new physics in the electroweak symmetry breaking sector. The first part of the study is model-independent, with $h$ couplings to standard model particles scaled by quantities that are taken to be free parameters. At the same time, the additional loop contributions to $h\to \gamma \gamma$ and $h\to Z\gamma$, mediated by charged scalar contributions in the extended scalar sector, are treated in terms of gauge-invariant effective operators. Having justified this approach for cases where the concerned scalar masses are a little above the $Z$-boson mass, we fit the existing data to obtain marginalized 1$\sigma$ and 2$\sigma$ regions in the space of the coefficients of such effective operators, where the limit on the $h\to Z\gamma$ branching ratio is used as a constraint. The correlation between, say, the gluon fusion and vector-boson fusion channels, as reflected in a non-diagonal covariance matrix, is taken into account. After thus obtaining model-independent fits, the allowed values of the coefficients are translated into permissible regions of the parameter spaces of several specific models. In this spirit we constrain four different types of two Higgs doublet models, and also models with one or two $Y=2$ scalar triplets, taking into account the correlatedness of the scale factors in $h$-interactions and the various couplings of charged Higgs states in each extended scenario.

   hep-phJHEP(2018)·5 citations
4. 04*

   Multiparticle Production at Mid-Rapidity in the Color-Glass Condensate

   Mauricio Martinez🇺🇸 · Matthew D. Sievert🇺🇸 · Douglas E. Wertepny🇪🇸

   In this paper, we compute a number of cross sections for the production of multiple particles at mid-rapidity in the semi-dilute / dense regime of the color-glass condensate (CGC) effective field theory. In particular, we present new results for the production of two quark-antiquark pairs (whether the same or different flavors) and for the production of one quark-antiquark pair and a gluon. We also demonstrate the existence of a simple mapping which transforms the cross section to produce a quark-antiquark pair into the corresponding cross section to produce a gluon, which we use to obtain various results and to cross-check them against the literature. We also discuss hadronization effects in the heavy flavor sector, writing explicit expressions for the production of various combinations of $D$ and $\bar{D}$ mesons, $J/\psi$ mesons, and light hadrons. The various multiparticle cross sections presented here contain a wealth of information and can be used to study heavy flavor production, charge-dependent correlations, and "collective" flow phenomena arising from initial-state dynamics.

   hep-phnucl-thJHEP(2019)·18 citations
5. 05*

   Non-Global and Clustering Effects for Groomed Multi-Prong Jet Shapes

   Duff Neill🇺🇸

   We present a resummation valid to next-to leading logarithmic accuracy of the non-global and clustering effects in groomed (with modified mass drop tagger) multi-pronged observables. These effects are universal in the sense that they depend only on the flavor structure of the $1\to 2$ splitting forming the multi-pronged subjets and the opening angle of the splitting, being insensitive to the underlying hard process or underlying event. The differential spectra with and without the non-global and clustering effects are presented, and the change in the spectra is found to be small.

   hep-phJHEP(2019)·18 citations
6. 06*

   Multi-component dark matter from a hidden gauged SU(3)

   Alexandre Poulin🇨🇦 · Stephen Godfrey🇨🇦

   We study Dark Matter (DM) phenomenology with multiple DM species consisting of both scalar and vector DM particles. More specifically, we study the Hidden Gauged SU(3) model of Arcadi {\it et al}. Before proceeding to the Hidden Gauged SU(3) model, we study the relic abundances of simplified multi-species DM scenarios to gain some insights when multiple species and interactions are included. In the Hidden Gauged SU(3) model, because of the large parameter space, we restrict ourselves to three representative benchmark points, each with multiple DM species. The relic densities for the benchmark points were found using a program developed to solve the coupled Boltzmann equations for an arbitrary number of interacting DM species with two particles in the final state. For each case, we varied the mass of the DM particles and then found the value of the dark SU(3) gauge coupling that gives the correct relic density. We found that in some regions of the parameter space, the DM would be difficult to observe in direct detection experiments while easier to observe in indirect detection experiments and vice versa, so that complementary measurements could help pinpoint the details of the Hidden Gauged SU(3) model. Important to this, is that even for moderate changes in input parameter values, the relative relic density of each species can change significantly resulting in large changes in the observability of multi-species DM by direct or indirect detection.

   hep-phPRD(2019)·46 citations
7. 07*

   Energy evolution and the Bose-Einstein enhancement for double parton densities

   E. Gotsman (Tel Aviv U.)🇮🇱 · E. Levin (Tel Aviv U./UTFSM)🇮🇱

   In this paper we found that the Bose-Einstein enhancement generates the strong correlations, which increase with energy in the BFKL evolution. This increase leads to the double parton densities ( $\Phi$), that are much larger than the product of the single parton densities ($\varphi$). However, numerically, it turns out that the ratio $\Phi /{\varphi }^2\propto \text{Lb}1/x{\text{Rb}}^{{\delta }_2}$ with ${\delta }_2\sim \text{bas}/\text{Lb}{N}_c^2-1{\text{Rb}}^{2/3}\ll 1$ and we do not expect a large correction for the accessible range of energies. However, for $N_c=3$ it tuns out that ${\delta }_2=0.07{\Delta }_{\mathrm{BFKL}}$ where ${\Delta }_{\mathrm{BFKL}}$ is the intercept of the BFKL Pomeron and we can anticipate an substantial increase for the range of rapidities $Y\sim 20$.It is shown that all $1/(N_c^2-1)$ corrections to the double parton densities stem from the Bose-Einstein enhancement.

   hep-phPRD(2019)·0 citations
8. 08*

   Coupled-channel effects in hadron-hadron correlation functions

   J. Haidenbauer🇩🇪

   Two-particle momentum correlation functions as measured in heavy ion collisions or in high-energetic proton-proton collisions are studied. Special emphasis is put on systems like $\Lambda \Lambda$ or $K^{-}p$ where effects from the coupling to other channels could be relevant. In both cases other channels open at relatively low momenta or are already open at the reaction threshold. To have a solid basis, realistic coupled-channel interactions for $\Lambda \Lambda -\Xi N-\Lambda \Sigma -\Sigma \Sigma$ and $\pi \Lambda -\pi \Sigma -\bar{K}N$ are utilized in the actual calculations. It is found that the opening of the $\Xi N$ channel leaves a trace in the $\Lambda \Lambda$ correlation function that could be detectable in experiments. Should the proposed $H$-dibaryon be located close to or below the $\Xi N$ it will have a very pronounced effect. The presence of open channels in systems like ${\Xi }^{-}p$ or $K^{-}p$ does influence the correlation functions significantly at low momenta and will certainly complicate any dedicated analysis.

   hep-phnucl-thNPA(2019)·92 citations
9. 09*

   Test of semi-local duality in a large $N_C$ framework

   Ling-Yun Dai🇨🇳 · Xian-Wei Kang🇨🇳 · Ulf-G. Meißner🇩🇪

   In this paper we test the semi-local duality based on the method of Ref.[1] for calculating final-state interactions at varying number of colors ($N_C$). We compute the amplitudes by dispersion relations that respect analyticity and coupled channel unitarity, as well as accurately describing experiment. The $N_C$ dependence of the $\pi \pi \to \pi \pi$ scattering amplitudes is obtained by comparing these amplitudes to the one of chiral perturbation theory. The semi-local duality is investigated by varying $N_C$. Our results show that the semi-local duality is not violated when $N_C$ is large. At large $N_C$, the contributions of the $f_2(1270)$, the $f_0(980)$ and the $f_0(1370)$ cancel that of the $\rho (770)$ in the finite energy sum rules, while the $f_0(500)$ has almost no effect. This gives further credit to the method developed in Ref.[1] for investigating the $N_C$ dependence of hadron-hadron scattering with final-state interactions. This study is also helpful to understand the structure of the scalar mesons.

   hep-phnucl-thPRD(2018)·10 citations
10. 10*

    $\mu -\tau$ Reflection Symmetry and Its Explicit Breaking for Leptogenesis in a Minimal Seesaw Model

    Newton Nath🇨🇳

    The minimal seesaw framework, embroiling the Dirac neutrino mass matrix $M_D$ and the Majorana neutrino mass matrix $M_R$, is quite successful to explain the current global-fit results of neutrino oscillation data. In this context, we consider most predictive forms of $M_D$ and $M_R$ with two simple parameters, respectively. Considering these matrices, we obtain the low energy neutrino mass matrix under type-I seesaw formalism which obeys $\mu -\tau$ reflection symmetry and predicts ${\theta }_{23}=\pi /4$ and $\delta =\pm \pi /2$. In the given set-up, we also evaluate the Baryon Asymmetry of the Universe (BAU) through successful leptogenesis and find that perturbation of $\mathcal{O}(10^{-2})$ leads to the observed BAU and breaks exactness of the symmetry. Moreover, we also perform various correlation studies among different parameters in the framework of broken symmetry.

    hep-phMod.Phys.Lett.A(2019)·23 citations
11. 11*

    Quantifying jet modifications with substructure

    Konrad Tywoniuk🇨🇭 · Yacine Mehtar-Tani🇺🇸

    The striking suppression and modification patterns that are observed in jet observables measured in heavy-ion collisions with respect to the proton-proton baseline have the potential to constrain the spatio-temporal branching process of energetic partons in a dense QCD medium. The mechanism of jet energy loss is intricately associated with medium resolution of jet substructure fluctuations. This naturally affects the behavior of the suppression of jets at high-pT, inducing an explicit dependence on jet scales. In this contribution, we review recent work on using the insight from multi-parton quenching to calculate leading-logarithmic corrections to the single-inclusive jet spectrum, and discuss its impact on a wide range of observables, including jet substructure.

    hep-phnucl-th0 citations
12. 12*

    Chiral symmetry breaking for fermions charged under large Lie groups

    Felipe J. Llanes-Estrada🇪🇸 · Alexandre Salas-Bernárdez🇪🇸

    We reexamine the dynamical generation of mass for fermions charged under various Lie groups with equal charge and mass at a high Grand Unification scale, extending the Renormalization Group Equations in the perturbative regime to two-loops and matching to the Dyson-Schwinger Equations in the strong coupling regime.

    hep-phCommun.Theor.Phys.(2019)·5 citations
13. 13*

    Hypothesis about semi-weak interaction and experiments with solar neutrinos. II. Deuteron disintegration by neutral currents

    L.M. Slad🇷🇺

    The present work provides one more evidence of that the solar neutrino problem has an elegant solution based on the hypothesis about the existence of a new, semi-weak, interaction. The analysis of the deuteron disintegration by neutral currents of solar neutrinos, generated by both the electroweak and semi-weak interactions, is fulfilled. A good agreement between the theoretical and experimental results for this process is obtained, which is in harmony with the conclusions of the first part of the work on the other four observed processes with solar neutrinos.

    hep-phastro-ph.SRhep-exnucl-th2 citations
14. 14*

    Five-Particle Phase-Space Integrals in QCD

    O. Gituliar🇩🇪 · V. Magerya🇩🇪 · A. Pikelner🇩🇪

    We present analytical expressions for the 31 five-particle phase-space master integrals in massless QCD as an $ϵ$-series with coefficients being multiple zeta values of weight up to 12. In addition, we provide a computer code for the Monte-Carlo integration in higher dimensions, based on the RAMBO algorithm, that has been used to numerically cross-check the obtained results in 4, 6, and 8 dimensions.

    hep-phPoS(2018)·2 citations
15. 15*

    Dulaity and charged pion condensation in chirally asymmetric dense quark matter in the framework of an NJL${}_2$ model

    T. G. Khunjua🇷🇺 · V. C. Zhukovsky🇷🇺 · K. G. Klimenko🇷🇺 · R. N. Zhokhov🇷🇺

    In this talk we present investigation of the phase structure of a (1+1)-dimensional quark model with four-quark interaction and in the presence of baryon (${\mu }_B$), isospin (${\mu }_I$) and chiral isospin (${\mu }_{I5}$) chemical potentials. Spatially homogeneous and inhomogeneous (chiral density wave (for chiral condensate) and single wave (for charged pion condensate)) condensates are considered. It is established that in the large-$N_c$ limit ($N_c$ is the number of colored quarks) there exists a duality correspondence between the chiral symmetry breaking phase and the charged pion condensation one. The primary conclusion of this investigation is the fact that chiral isospin chemical potential generates charged pion condensation with non-zero baryon density in dense quark matter. Moreover, it is shown that inhomogeneous charged PC phase with nonzero baryon density is induced in the model by arbitrary small values of the chemical potential ${\mu }_{I5}$ (for a rather large region of ${\mu }_B$ and ${\mu }_I$).

    hep-phhep-thInt.J.Mod.Phys.Conf.Ser.(2018)·6 citations
16. 16*

    Electromagnetic spectral function and dilepton rate in a hot magnetized QCD medium

    Snigdha Ghosh🇮🇳 · Vinod Chandra🇮🇳

    The dilepton production rate in hot QCD medium is studied within a effective description of the medium in the presence of magnetic field. This could be done by obtaining the one-loop self energy of photon due to the effective (quasi-) quark loop at finite temperature under an arbitrary external magnetic field while employing the real time formalism of Thermal Field Theory. The effective quarks and gluons encode hot QCD medium effective in terms of their respective effective fugacities. The magnetic field enters in the form of landau level quantization, in the matter sector (quarks, antiquarks). The full Schwinger proper time propagator including all the Landau levels is considered for the quasi quarks while calculating the photon self energy. The electromagnetic Debye screening (in terms of the self-energy) has seen to be influenced both by the hot QCD medium effects and magnetic field. Analogous results are also obtained from the semi classical transport theory. The imaginary part of the photon self energy function is obtained from the discontinuities of the self energy across the Unitary cuts which are also present at zero magnetic field and the Landau cuts which are purely due to the magnetic field. The dilepton production rate is then obtained in terms of the product of electromagnetic spectral functions due to quark loop and lepton loop. The modifications of both the quarks/antiquarks as well as leptons in presence of an arbitrary external magnetic field have been considered in the formalism. Significant enhancement of the low invariant mass dileptons due the appearance of the Landau cuts in the electromagnetic spectral function at finite external magnetic field has been observed. A substantial enhancement of dilepton rate is also found when the EOS effects are considered through the effective quarks/antiquraks.

    hep-phnucl-thPRD(2018)·54 citations
17. 17*

    Nonperturbative properties of Yang-Mills theories

    Markus Q. Huber🇦🇹

    Yang-Mills theories are an important building block of the standard model and in particular of quantum chromodynamics. Its correlation functions describe the behavior of its elementary particles, the gauge bosons. In quantum chromodynamics, the correlation functions of the gluons are basic ingredients for calculations of hadrons from bound state equations or properties of its phase diagram with functional methods. Correlation functions of gluons are defined only in a gauge fixed setting. The focus of many studies is the Landau gauge which has some features that alleviate calculations. I discuss recent results of correlation functions in this gauge obtained from their equations of motions. Besides the four-dimensional case also two and three dimensions are treated, since the effects of truncations, viz., the procedure to render the infinitely large system of equations finite, can be studied more directly in these cases. In four dimensions, the anomalous running of dressing functions plays a special role and it is explained how resummation is realized in the case of Dyson-Schwinger equations. Beyond the Landau gauge other gauges can provide additional insights or can alleviate the development of new methods. Some aspects or ideas are more easily accessible in alternative gauges and the results presented here for linear covariant gauges, the Coulomb gauge and the maximally Abelian gauge help to refine our understanding of Yang-Mills theories.

    hep-phPhys.Rept.(2020)·186 citations
18. 18*

    Constraining new physics with searches for long-lived particles: Implementation into SModelS

    Jan Heisig🇩🇪 · Sabine Kraml🇫🇷 · Andre Lessa🇧🇷

    We present the implementation of heavy stable charge particle (HSCP) and R-hadron signatures into SModelS v1.2. We include simplified-model results from the 8 and 13 TeV LHC and demonstrate their impact on two new physics scenarios motivated by dark matter: the inert doublet model and a gravitino dark matter scenario. For the former, we find sensitivity up to dark matter masses of 580 GeV for small mass splittings within the inert doublet, while missing energy searches are not able to constrain any significant part of the cosmologically preferred parameter space. For the gravitino dark matter scenario, we show that both HSCP and R-hadron searches provide important limits, allowing to constrain the viable range of the reheating temperature.

    hep-phPLB(2019)·64 citations
19. 19*

    One-loop neutrino mass model without any additional symmetries

    Takaaki Nomura🇰🇷 · Hiroshi Okada🇰🇷

    We propose a radiative seesaw model at one-loop level, introducing fields with large multiplet of $SU(2{)}_L$. Thanks to large representations, any additional symmetries are not needed. In this framework, we formulate lepton and new fermion sector such as mass matrices, LFVs, and muon $g-2$. Furthermore, we show our cut-off scale via RGEs of $SU(2{)}_L$, and numerical analysis at a benchmark point included in dark matter candidate. Finally, we brief discuss possibility to detect at colliders.

    hep-phPhys.Dark Univ.(2019)·17 citations
20. 20*

    Hadron-jet correlations in high-energy hadronic collisions at the LHC

    Andrèe Dafne Bolognino🇮🇹 · Francesco Giovanni Celiberto🇪🇸 · Dmitry Yu. Ivanov🇷🇺 · Mohammed M.A. Mohammed🇮🇹 · Alessandro Papa🇮🇹

    The inclusive production at the LHC of a charged light hadron and of a jet, featuring a wide separation in rapidity, is suggested as a new probe process for the investigation of the BFKL mechanism of resummation of energy logarithms in the QCD perturbative series. We present some predictions, tailored on the CMS and CASTOR acceptances, for the cross section averaged over the azimuthal angle between the identified jet and hadron and for azimuthal correlations.

    hep-phEPJC(2018)·84 citations
21. 21*

    The $I=1$ pion-pion scattering amplitude and timelike pion form factor from $N_{\mathrm{f}}=2+1$ lattice QCD

    Christian Andersen🇩🇰 · John Bulava🇩🇰 · Ben Hörz🇩🇪 · Colin Morningstar🇺🇸

    The elastic $I=1$ $p$-wave $\pi \pi$ scattering amplitude is calculated together with the isovector timelike pion form factor using lattice QCD with $N_{\mathrm{f}}=2+1$ dynamical quark flavors. Wilson clover ensembles generated by the Coordinated Lattice Simulations (CLS) initiative are employed at four lattice spacings down to $a=0.05\mathrm{fm}$, several pion masses down to $m_{\pi }=200\mathrm{MeV}$, and spatial volumes of extent $L=3.1-5.5\mathrm{fm}$. The set of measurements on these ensembles, which is publicly available, enables an investigation of systematic errors due to the finite lattice spacing and spatial volume. The $\pi \pi$ scattering amplitude is fit on each ensemble by a Breit-Wigner resonance lineshape, while the form factor is described better by a thrice-subtracted dispersion relation than the Gounaris-Sakurai parametrization.

    ↳ hep-lathep-phNPB(2019)·136 citations
22. 22*

    Circularly Polarized EM Radiation from GW Binary Sources

    Soroush Shakeri🇮🇷 · Alireza Allahyari🇮🇷

    We consider the polarization characteristics of the electromagnetic (EM) counterpart of the gravitational wave (GW) created by coalescence of the binary sources. Here, we explore the impact of the photon-graviton interaction on the polarization evolution of X-ray emission of GammaRay Bursts (GRBs). We show that significant circular polarization can be generated due to the gravitational wave from the binary merger. The circular polarization besides photon energy depends on parameters of GW source such as the chirp mass of the binary, frequency of the GWs and radial distance from the source. Our predicted signal can be used as an indirect probe for GW events and also the nature of photon-graviton interaction. We argue that this polarization signal might be in sensitivity range of upcoming X-ray polarimetry missions.

    ↳ astro-ph.HEastro-ph.COhep-phJCAP(2018)·13 citations
23. 23*

    Light Dark Matter eXperiment (LDMX)

    Torsten Åkesson🇸🇪 · Asher Berlin🇺🇸 · Nikita Blinov🇺🇸 · Owen Colegrove🇺🇸 · Giulia Collura🇺🇸 · Valentina Dutta🇺🇸 · Bertrand Echenard🇺🇸 · Joshua Hiltbrand🇺🇸 · David G. Hitlin🇺🇸 · Joseph Incandela🇺🇸 · John Jaros🇺🇸 · Robert Johnson🇺🇸 and 13 other authors

    We present an initial design study for LDMX, the Light Dark Matter Experiment, a small-scale accelerator experiment having broad sensitivity to both direct dark matter and mediator particle production in the sub-GeV mass region. LDMX employs missing momentum and energy techniques in multi-GeV electro-nuclear fixed-target collisions to explore couplings to electrons in uncharted regions that extend down to and below levels that are motivated by direct thermal freeze-out mechanisms. LDMX would also be sensitive to a wide range of visibly and invisibly decaying dark sector particles, thereby addressing many of the science drivers highlighted in the 2017 US Cosmic Visions New Ideas in Dark Matter Community Report. LDMX would achieve the required sensitivity by leveraging existing and developing detector technologies from the CMS, HPS and Mu2e experiments. In this paper, we present our initial design concept, detailed GEANT-based studies of detector performance, signal and background processes, and a preliminary analysis approach. We demonstrate how a first phase of LDMX could expand sensitivity to a variety of light dark matter, mediator, and millicharge particles by several orders of magnitude in coupling over the broad sub-GeV mass range.

    ↳ hep-exastro-ph.COhep-phphysics.ins-det252 citations
24. 24*

    Comment on "Covariant Tolman-Oppenheimer-Volkoff equations. II. The anisotropic case"

    A. A. Isayev🇺🇦

    Recently, the covariant formulation of the Tolman-Oppenheimer-Volkoff (TOV) equations for studying the equilibrium structure of a spherically symmetric compact star in the presence of the pressure anisotropy in the interior of a star was presented in Phys. Rev. D \textbf{97} (2018) 124057. It was suggested there that the anisotropic solution of these equations can be obtained by finding, first, the solution of the common TOV equations for the isotropic pressure, and then by solving the differential equation for the anisotropic pressure whose particular form was established on the basis of the covariant TOV equations. It turns out that the anisotropic pressure determined according to this scheme has a nonremovable singularity $\Pi \sim \frac{1}{r^2}$ in the center of a star, and, hence, the corresponding anisotropic solution cannot represent a physically relevant model of an anisotropic compact star. A new scheme for constructing the anisotropic solution, based on the covariant TOV equations, is suggested, which leads to the regularly behaved physical quantities in the interior of a star. A new algorithm is applied to build model anisotropic strange quark stars with the MIT bag model equation of state.

    ↳ gr-qcastro-ph.HEhep-phPRD(2018)·5 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.