Mon·Oct 16, 2017Monday·October 16, 2017

1. 01*

   Analysis of Dark Matter Axion Clumps with Spherical Symmetry

   Enrico D. Schiappacasse🇺🇸 · Mark P. Hertzberg🇺🇸

   Recently there has been much interest in the spatial distribution of light scalar dark matter, especially axions, throughout the universe. When the local gravitational interactions between the scalar modes are sufficiently rapid, it can cause the field to re-organize into a BEC of gravitationally bound clumps. While these clumps are stable when only gravitation is included, the picture is complicated by the presence of the axion's attractive self-interactions, which can potentially cause the clumps to collapse. Here we perform a detailed stability analysis to determine under what conditions the clumps are stable. In this paper we focus on spherical configurations, leaving aspherical configurations for future work. We identify branches of clump solutions of the axion-gravity-self-interacting system and study their stability properties. We find that clumps that are (spatially) large are stable, while clumps that are (spatially) small are unstable and may collapse. Furthermore, there is a maximum number of particles that can be in a clump. We map out the full space of solutions, which includes quasi-stable axitons, and clarify how a recent claim in the literature of a new ultra-dense branch of stable solutions rests on an invalid use of the non-relativistic approximation. We also consider repulsive self-interactions that may arise from a generic scalar dark matter candidate, finding a single stable branch that extends to arbitrary particle number.

   hep-phastro-ph.COastro-ph.GAhep-thJCAP(2018)·131 citations
2. 02*

   Electroweak Symmetry Breaking and Mass Spectra in Six-Dimensional Gauge-Higgs Grand Unification

   Yutaka Hosotani🇯🇵 · Naoki Yamatsu🇯🇵

   The mass spectra of the standard model particles are reproduced in the $SO(11)$ gauge-Higgs grand unification in the six-dimensional warped space without introducing exotic light fermions. Light neutrino masses are explained by the gauge-Higgs seesaw mechanism. We evaluate the effective potential of the 4d Higgs boson appearing as a fluctuation mode of the Aharonov-Bohm phase ${\theta }_H$ in the extra-dimensioal space, and show that the dynamical electroweak symmetry breaking takes place with the Higgs boson mass $m_H\sim 125$GeV and ${\theta }_H\sim 0.1$. The Kaluza-Klein mass scale in the fifth dimension is approximately given by $m_{\mathrm{KK}}\sim 1.230\mathrm{TeV}/\sin {\theta }_H$.

   hep-phhep-thPTEP(2018)·35 citations
3. 03*

   Recent developments in bound-state calculations using the Dyson-Schwinger and Bethe-Salpeter equations

   Helios Sanchis-Alepuz🇦🇹 · Richard Williams🇩🇪

   We review in detail modern numerical methods used in the determination and solution of Bethe-Salpeter and Dyson--Schwinger equations. The algorithms and techniques described are applicable to both the rainbow-ladder truncation and its non-trivial extensions. We discuss pedagogically the steps involved in constructing conventional mesons and baryons as systems of two- and three-quarks respectively. As further application we describe the self-consistent calculation of form-factors and highlight the challenges that remain therein.

   hep-phComput.Phys.Commun.(2018)·81 citations
4. 04*

   B Production In p-p and A-A Collisions

   Leonard S. Kisslinger🇺🇸 · Bijit Singha🇺🇸

   This is an extension of our recent work on $D^{+}(c\bar{d}),D^o(c\bar{u})$ production from p-p and d-Au collisions to $B^{+}(b\bar{d}),B^o(b\bar{u})$ production from p-p and A-A collisions. The rapidity cross sections for $B^{+}(c\bar{d}),B^o(b\bar{u})$ production from both p-p and A-A collisions are estimated. Our present work makes use of previous work on $J/\Psi$, ${\Psi }^{\prime }(2S)$, ${\rm Y}(nS)$ production in p-p and A-A collisions, with the main new aspect being the fragmentation probability, $D_{b\to b\bar{q}}$, which turns out to be similar to the fragmentation probability $D_{c\to c\bar{q}}$ used in our recent work.

   hep-phInt.J.Theor.Phys.(2017)·0 citations
5. 05*

   QCD calculations for the LHC: status and prospects

   Gudrun Heinrich🇩🇪

   We briefly review the status of high precision QCD predictions available for LHC processes, focusing on corrections beyond NLO and ways to make the latter available in a convenient format. As a phenomenological example we discuss the two-loop corrections to Higgs boson pair production in gluon fusion.

   hep-ph17 citations
6. 06*

   Study of spin-dependent structure functions of ${}^3\mathrm{He}$ and ${}^3\mathrm{H}$ at NNLO approximation and corresponding nuclear corrections

   Hamzeh Khanpour🇮🇷 · S. Taheri Monfared🇮🇷 · S. Atashbar Tehrani🇮🇷

   We determine polarized parton distribution functions (PPDFs) and structure functions from recent experimental data of polarized deep inelastic scattering (DIS) on nuleons at next-to-next-to-leading order (NNLO) approximation in perturbative quantum chromodynamic (pQCD). The nucleon polarized structure functions are computed using the Jacobi polynomial approach while target mass corrections (TMCs) are included in our fitting procedure. Having extracted the polarized spin structure functions, we extend our study to describe ${}^3\mathrm{H}e$ and ${}^3\mathrm{H}$ polarized structure functions, as well as the Bjorken sum rule. We also explore the importance of the nuclear corrections on the polarized nuclear structure functions at small and large values of $x$. Our results are compared with the recent available and high precision polarized ${}^3\mathrm{H}e$ and ${}^3\mathrm{H}$ experimental data.

   hep-phhep-exnucl-thPRD(2017)·24 citations
7. 07*

   Gravitational Waves, mu Term & Leptogenesis from B-L Higgs Inflation in Supergravity

   C. Pallis🇨🇾

   We consider a renormalizable extension of the minimal supersymmetric standard model endowed by an R and a gauged B - L symmetry. The model incorporates chaotic inflation driven by a quartic potential, associated with the Higgs field which leads to a spontaneous breaking of U(1)B-L, and yields possibly detectable gravitational waves. We employ quadratic Kahler potentials with a prominent shift-symmetric part proportional to c- and a tiny violation, proportional to c+, included in a logarithm with prefactor -N<0. It also offers an explanation of mu term of the MSSM provided that one related parameter in the superpotential is somewhat small. Baryogenesis occurs via non-thermal leptogenesis which is realized by the inflaton's decay to the lightest or next-to-lightest right-handed neutrino with masses lower than 1.8x10^13 GeV. Our scenario can be confronted with the current data on the inflationary observables, the baryon asymmetry of the universe, the gravitino limit on the reheating temperature and the data on the neutrino oscillation parameters, for 0.012<=c+/c-<1/N and gravitino as light as 1 TeV.

   hep-phastro-ph.COhep-thUniverse(2018)·22 citations
8. 08*

   ChPT loops for the lattice: pion mass and decay constant, HVP at finite volume and $n\bar{n}$-oscillations

   Johan Bijnens (Lund)🇸🇪

   I present higher loop order results for several calculations in Chiral perturbation Theory. 1) Two-loop results at finite volume for hadronic vacuum polarization. 2) A three-loop calculation of the pion mass and decay constant in two-flavour ChPT. For the pion mass all needed auxiliary parameters can be determined from lattice calculations of $\pi \pi$-scattering. 3) Chiral corrections to neutron-anti-neutron oscillations.

   ↳ hep-lathep-phEPJ Web Conf.(2018)·0 citations
9. 09*

   Gravitational collapse in the Schrödinger-Poisson system

   Mathias Garny🇩🇪 · Thomas Konstandin🇩🇪

   We perform a quantitative comparison between N-body simulations and the Schrödinger-Poisson system in 1+1 dimensions. In particular, we study halo formation with different initial conditions. We observe the convergence of various observables in the Planck constant h-bar and also test virialization. We discuss the generation of higher order cumulants of the particle distribution function which demonstrates that the Schrödinger-Poisson equations should not be perceived as a generalization of the dust model with quantum pressure but rather as one way of sampling the phase space of the Vlasov-Poisson system -- just as N-body simulations. Finally, we quantitatively recover the scaling behavior of the halo density profile from N-body simulations.

   ↳ astro-ph.COhep-phJCAP(2018)·28 citations
10. 10*

    Coleman-Weinberg linear inflation: metric vs. Palatini formulation

    Antonio Racioppi🇪🇪

    It has been previously shown that the linear inflation appears naturally as a solution of Coleman-Weinberg inflation, provided that the inflaton has a non-minimal coupling to gravity and the Planck scale is dynamically generated. We revisit the previous study by improving the discussion of reheating and by comparing the results of the metric and the Palatini formulations of non-minimal gravity. We find that both formulations predict linear inflation but a different number of $e$-folds. If the non-minimal coupling is larger than one, future experimental sensitivity can discriminate between the two realizations.

    ↳ astro-ph.COgr-qchep-phJCAP(2017)·91 citations
11. 11*

    Light Neutron-Rich Hypernuclei from the Importance-Truncated No-Core Shell Model

    Roland Wirth🇩🇪 · Robert Roth🇩🇪

    We explore the systematics of ground-state and excitation energies in singly-strange hypernuclei throughout the helium and lithium isotopic chains --- from ${}_{\Lambda }^5$He to ${}_{\Lambda }^{11}$He and from ${}_{\Lambda }^7$Li to ${}_{\Lambda }^{12}$Li --- in the ab initio no-core shell model with importance truncation. All calculations are based on two- and three-baryon interaction from chiral effective field theory and we employ a similarity renormalization group transformation consistently up to the three-baryon level to improve the model-space convergence. While the absolute energies of hypernuclear states show a systematic variation with the regulator cutoff of the hyperon-nucleon interaction, the resulting neutron separation energies are very stable and in good agreement with available data for both nucleonic parents and their daughter hypernuclei. We provide predictions for the neutron separation energies and the spectra of neutron-rich hypernuclei that have not yet been observed experimentally. Furthermore, we find that the neutron drip lines in the helium and lithium isotopic chains are not changed by the addition of a hyperon.

    ↳ nucl-thhep-phnucl-exPLB(2018)·57 citations
12. 12*

    keV-Scale Sterile Neutrino Sensitivity Estimation with Time-Of-Flight Spectroscopy in KATRIN using Self-Consistent Approximate Monte Carlo

    Nicholas M.N. Steinbrink🇩🇪 · Jan D. Behrens🇩🇪 · Susanne Mertens🇩🇪 · Philipp C.-O. Ranitzsch🇩🇪 · Christian Weinheimer🇩🇪

    We investigate the sensitivity of the Karlsruhe Tritium Neutrino Experiment (KATRIN) to keV-scale sterile neutrinos, which are promising dark matter candidates. Since the active-sterile mixing would lead to a second component in the tritium $\beta$-spectrum with a weak relative intensity of order ${\sin }^2\theta \lesssim 1\times 10^{-6}$, additional experimental strategies are required to extract this small signature and to eliminate systematics. A possible strategy is to run the experiment in an alternative time-of-flight (TOF) mode, yielding differential TOF spectra in contrast to the integrating standard mode. In order to estimate the sensitivity from a reduced sample size, a new analysis method, called self-consistent approximate Monte Carlo (SCAMC), has been developed. The simulations show that an ideal TOF mode would be able to achieve a statistical sensitivity of ${\sin }^2\theta \sim 5\times 10^{-9}$ at one $\sigma$, improving the standard mode by approximately a factor two. This relative benefit grows significantly if additional exemplary systematics are considered. A possible implementation of the TOF mode with existing hardware, called gated filtering, is investigated, which, however, comes at the price of a reduced average signal rate.

    ↳ physics.ins-dethep-exhep-phEPJC(2018)·10 citations
13. 13*

    Supersymmetric solutions and Borel singularities for N=2 supersymmetric Chern-Simons theories

    Masazumi Honda🇮🇱

    In supersymmetric (SUSY) field theory, there exist configurations which formally satisfy SUSY conditions but are not on original path integral contour. We refer to such configurations as complexified supersymmetric solutions (CSS). In this paper we discuss that CSS provide important information on large order behavior of weak coupling perturbative series in SUSY field theories. We conjecture that CSS with a bosonic (fermionic) free parameter give poles (zeroes) of Borel transformation of perturbative series whose locations are uniquely determined by actions of the solutions. We demonstrate this for various SUSY observables in 3d $\mathcal{N}=2$ SUSY Chern-Simons matter theories on sphere. First we construct infinite number of CSS in general 3d $\mathcal{N}=2$ SUSY theory with Lagrangian where adjoint scalar in vector multiplet takes a complex value and matter fields are nontrivial. Then we compare their actions with Borel transformations of perturbative expansions by inverse Chern-Simons levels for the observables and see agreement with our conjecture. It turns out that the CSS explain all the Borel singularities for this case.

    ↳ hep-thcond-mat.str-elhep-phmath-ph+1PRL(2018)·17 citations
14. 14*

    Equation of State in 2+1 Flavor QCD at High Temperatures

    A. Bazavov🇺🇸 · P. Petreczky🇺🇸 · J. H. Weber🇩🇪

    We calculate the Equation of State at high temperatures in 2+1 flavor QCD using the highly improved staggered quark action. We study the lattice spacing dependence of the pressure at high temperatures using lattices with temporal extent $N_{\tau }=6,8,10$ and $12$ and perform continuum extrapolations. We also give a continuum estimate for the Equation of State up to temperatures $T=2$ GeV, which are then compared with results of the weak-coupling calculations. We find a reasonably good agreement with the weak-coupling calculations at the highest temperatures.

    ↳ hep-lathep-phPRD(2018)·126 citations
15. 15*

    Neutrinoless double beta decay matrix elements in light nuclei

    S. Pastore🇺🇸 · J. Carlson🇺🇸 · V. Cirigliano🇺🇸 · W. Dekens🇺🇸 · E. Mereghetti🇺🇸 · R.B. Wiringa🇺🇸

    We present the first ab initio calculations of neutrinoless double beta decay matrix elements in $A=6$-$12$ nuclei using Variational Monte Carlo wave functions obtained from the Argonne $v_{18}$ two-nucleon potential and Illinois-7 three-nucleon interaction. We study both light Majorana neutrino exchange and potentials arising from a large class of multi-TeV mechanisms of lepton number violation. Our results provide benchmarks to be used in testing many-body methods that can be extended to the heavy nuclei of experimental interest. In light nuclei we have also studied the impact of two-body short range correlations and the use of different forms for the transition operators, such as those corresponding to different orders in chiral effective theory.

    ↳ nucl-thhep-lathep-phPRC(2018)·88 citations
16. 16*

    Hard X-ray Emission from the M87 AGN Detected with NuSTAR

    Ka-Wah Wong🇺🇸 · Rodrigo S. Nemmen🇧🇷 · Jimmy A. Irwin🇺🇸 · Dacheng Lin🇺🇸

    M87 hosts a 3-6 billion solar mass black hole with a remarkable relativistic jet that has been regularly monitored in radio to TeV bands. However, hard X-ray emission \gtrsim 10keV, which would be expected to primarily come from the jet or the accretion flow, had never been detected from its unresolved X-ray core. We report NuSTAR detection up to 40 keV from the the central regions of M87. Together with simultaneous Chandra observations, we have constrained the dominant hard X-ray emission to be from its unresolved X-ray core, presumably in its quiescent state. The core spectrum is well fitted by a power law with photon index Gamma=2.11 (+0.15 -0.11). The measured flux density at 40 keV is consistent with a jet origin, although emission from the advection-dominated accretion flow cannot be completely ruled out. The detected hard X-ray emission is significantly lower than that predicted by synchrotron self-Compton models introduced to explain emission above a GeV.

    ↳ astro-ph.HEhep-phApJL(2017)·15 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.