Wed·May 16, 2018Wednesday·May 16, 2018

1. 01*

   First estimates of the $B_c$ wave function from the data on the $B_c$ production cross section

   S.P. Baranov🇷🇺 · A.V. Lipatov🇷🇺

   In the framework of perturbative QCD and nonrelativistic bound state formalism, we calculate the production of $B_c$ and $B_c^{\ast }$ mesons at the conditions of the CDF and LHCb experiments. We derive first estimations for the $B_c$ wave function from a comparison with the available data.

   hep-phPLB(2018)·5 citations
2. 02*

   Flavor Mixing and the Permutation Symmetry among Generations

   T. K. Kuo🇺🇸 · S. H. Chiu🇹🇼

   In the standard model, the permutation symmetry among the three generations of fundamental fermions is usually regarded to be broken by the Higgs couplings. It is found that the symmetry is restored if we include the mass matrix parameters as physical variables which transform appropriately under the symmetry operation. Known relations between these variables, such as the renormalization group equations, as well as formulas for neutrino oscillations (in vacuum and in matter), are shown to be covariant tensor equations under the permutation symmetry group.

   hep-phAdv.High Energy Phys.(2020)·4 citations
3. 03*

   New Probes of New Physics with Leptonic Rare B Decays

   Robert Fleischer🇳🇱

   Decays of the kind $B_{s,d}^0\to {\ell }^{+}{\ell }^{-}$ belong to the most favourable processes for probing the flavour structure of the Standard Model, with outstanding sensitivity to new (pseudo)-scalar contributions. While the branching ratio of $B_s^0\to {\mu }^{+}{\mu }^{-}$ has already been measured at the LHC in the ballpark of the Standard Model expectation, there is still significant room for New-Physics effects. We discuss how these may be revealed in the future super-high precision era of $B$-decay studies by utilising new theoretically clean observables, including CP-violating asymmetries. Another promising decay is $B_s^0\to e^{+}{e}^{-}$, which has received little attention in view of its enormously helicity suppressed Standard Model branching ratio, with the most recent experimental upper bound dating back to 2009. Using the current constraints on New Physics from $B_s^0\to {\mu }^{+}{\mu }^{-}$ as a guideline, we show that the $B_s^0\to e^{+}{e}^{-}$ branching ratio may be hugely enhanced through new (pseudo)-scalar contributions up to the regime of $B_s^0\to {\mu }^{+}{\mu }^{-}$.

   hep-phhep-ex2 citations
4. 04*

   Self-heating of Strongly Interacting Massive Particles

   Ayuki Kamada🇰🇷 · Hee Jung Kim🇰🇷 · Hyungjin Kim🇮🇱

   It was recently pointed out that semi-annihilating dark matter (DM) may experience a novel temperature evolution dubbed as self-heating. Exothermic semi-annihilation converts the DM mass to the kinetic energy. This yields a unique DM temperature evolution, $T_{\chi }\propto 1/a$, in contrast to $T_{\chi }\propto 1/a^2$ for free-streaming non-relativistic particles. Self-heating continues as long as self-scattering sufficiently redistributes the energy of DM particles. In this paper, we study the evolution of cosmological perturbations in self-heating DM. We find that sub-GeV self-heating DM leaves a cutoff on the subgalactic scale of the matter power spectrum when the self-scattering cross section is ${\sigma }_{\mathrm{self}}/m_{\chi }\sim \mathcal{O}(1){\mathrm{cm}}^2/\mathrm{g}$. Then we present a particle physics realization of the self-heating DM scenario. The model is based on recently proposed strongly interacting massive particles with pion-like particles in a QCD-like sector. Pion-like particles semi-annihilate into an axion-like particle, which is thermalized with dark radiation. The dark radiation temperature is smaller than the standard model temperature, evading the constraint from the effective number of neutrino degrees of freedom. It is easily realized when the dark sector is populated from the standard model sector through a small coupling.

   hep-phastro-ph.COPRD(2018)·23 citations
5. 05*

   An experimentalist's guide to the semileptonic bottom to charm branching fractions

   Matthew Rudolph🇺🇸

   This work summarizes the current status of the measured semileptonic branching fractions $B^{0,+}\to X_c\mu \nu$. The sum of exclusive measurements is compared with the inclusive determination, accounting for isospin extrapolation. Further derived quantities are computed, taking into account different explanations for the unmeasured components of the total branching fraction. These quantities focus on the charge breakdown of the final states, and are designed for use as inputs or comparisons in future experimental measurements.

   hep-phhep-exInt.J.Mod.Phys.A(2018)·5 citations
6. 06*

   Charge splitting in $\pi N\Delta$ formfactor

   A.B. Gridnev · V.V. Abaev

   Experimental data on $\pi N$ scattering in the elastic energy region $W\le 1.45GeV$ are analyzed within the $K$-matrix approach with effective Lagrangians. The charge splitting in ${\delta }_{33}^{++}$ and ${\delta }_{33}^0$ phases obtaned in the phase shift analisys is studed . It is shown that the change in the sign in the energy dependence of the phase difference can be obtained with different formfactors of the ${\Delta }^{++}$ and ${\Delta }^0$ only . This means that ${\Delta }^{++}$ and ${\Delta }^0$ has a different size in $\pi N$ interaction.The underlying nature of the observed phenomena is discussed.

   hep-phPhys.Atom.Nucl.(2019)·0 citations
7. 07*

   Forward di-hadron back-to-back correlations in $\mathbf{pA}$ collisions from rcBK evolution

   Javier L. Albacete🇪🇸 · Giuliano Giacalone🇫🇷 · Cyrille Marquet🇫🇷 · Marek Matas🇨🇿

   We study the disappearance of the away-side peak of the di-hadron correlation function in p+A vs p+p collisions at forward rapidities, when the scaterring process presents a manifest dilute-dense asymmetry. We improve the state-of-the-art description of this phenomenon in the framework of the Color Glass Condensate (CGC), for hadrons produced nearly back-to-back. In that case, the gluon content of the saturated nuclear target can be described with transverse-momentum-dependent gluon distributions, whose small-$x$ evolution we calculate numerically by solving the Balitsky-Kovchegov equation with running coupling corrections. We first show that our formalism provides a good description of the disappearance of the away-side azimuthal correlations in d+Au collisions observed at BNL Relativistic Heavy Ion Collider (RHIC) energies. Then, we predict the away-side peak of upcoming p+Au data at $\sqrt[]{s}=200$ GeV to be suppressed by about a factor 2 with respect to p+p collisions, and we propose to study the rapidity dependence of that suppression as a complementary strong evidence of gluon saturation in experimental data.

   hep-phnucl-thPRD(2019)·74 citations
8. 08*

   On the Dihadron Angular Correlations in Forward $pA$ collisions

   Anna Stasto🇺🇸 · Shu-Yi Wei🇨🇳 · Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸

   Dihadron angular correlations in forward $pA$ collisions have been considered as one of the most sensitive observables to the gluon saturation effects. In general, both parton shower effects and saturation effects are responsible for the back-to-back dihadron angular de-correlations. With the recent progress in the saturation formalism, we can incorporate the parton shower effect by adding the corresponding Sudakov factor in the saturation framework. In this paper, we carry out the first detailed numerical study in this regard, and find a very good agreement with previous RHIC $pp$ and $dAu$ data. This study can help us to establish a baseline in $pp$ collisions which contains little saturation effects, and further make predictions for dihadron angular correlations in $pAu$ collisions, which will allow to search for the signal of parton saturation.

   hep-phPLB(2018)·66 citations
9. 09*

   Revisiting nonfactorizable charm-loop effects in exclusive FCNC $B$-decays

   Anastasiia Kozachuk🇷🇺 · Dmitri Melikhov🇦🇹

   We revisit the calculation of nonfactorizable corrections induced by charm-quark loops in exclusive FCNC $B$-decays. For the sake of clarity, we make use of a field theory with scalar particles: this allows us to focus on the conceptual issues and to avoid technical complications related to particle spins in QCD. We perform a straightforward calculation of the appropriate correlation function and show that it requires the knowledge of the full generic three-particle distribution amplitude with non-aligned arguments, $⟨0|\bar{s}(y)G_{\mu \nu }(x)b(0)|B(p)⟩$. Moreover, the dependence of this quantity on the variable $(x-y{)}^2$ is essential for a proper account of the ${\left({\Lambda }_{\mathrm{QCD}}{m}_b/m_c^2\right)}^n$ terms in the amplitudes of FCNC $B$-decays.

   hep-phPLB(2018)·21 citations
10. 10*

    Heavy quark spin multiplet structure of ${\bar{P}}^{(\ast )}{\Sigma }_Q^{(\ast )}$ molecular states

    Yuki Shimizu🇯🇵 · Yasuhiro Yamaguchi🇯🇵 · Masayasu Harada🇯🇵

    We study the structure of heavy quark spin (HQS) multiplets for heavy meson-baryon molecular states in a coupled system of ${\bar{P}}^{(\ast )}{\Sigma }_Q^{(\ast )}$, with constructing the one-pion exchange potential with S-wave orbital angular momentum. Using the light cloud spin basis, we find that there are four types of HQS multiplets classified by the structure of heavy quark spin and light cloud spin. The multiplets which have attractive potential are determined by the sign of the coupling constant for the heavy meson-pion interactions. Furthermore, the difference in the structure of light cloud spin gives the restrictions of the decay channel, which implies that the partial decay width has the information for the structure of HQS multiplets. This behavior is more likely to appear in hidden-bottom sector than in hidden-charm sector.

    hep-phPRD(2018)·15 citations
11. 11*

    Approximate Higgs alignment without decoupling

    Howard E. Haber🇺🇸

    The properties of the Higgs boson, h(125), observed in LHC data are consistent with Standard Model predictions. Consequently, if additional Higgs bosons are present, then the direction of h(125) in field space must be approximately aligned with the direction of the Higgs vacuum expectation value. One way to achieve approximate Higgs alignment is in the decoupling limit, where all additional Higgs scalars are significantly heavier than the h(125). In this presentation, the viability of approximate Higgs alignment without decoupling is addressed.

    hep-ph7 citations
12. 12*

    Charm-strange meson production in ultra-relativistic heavy-ion collisions at the CERN-LHC energies

    Shuang Li🇨🇳 · Chaowen Wang🇨🇳

    The nuclear modification factor $R_{\mathrm{AA}}$ and the elliptic flow coefficient $v_2$ of charm-strange meson $D_s^{+}$ is systematically studied in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02\mathrm{TeV}$ and $2.76\mathrm{TeV}$. During the modeling, the coupling strength between the injected charm quark and the incident medium constituents, is extracted from the lattice QCD calculations: $2\pi T{D}_s=7$ (\textbf{Model-A}) and $2\pi T{D}_s=1.3+(T/T_c{)}^2$ (\textbf{Model-B}). We find that, comparing $R_{\mathrm{AA}}(D_s^{+})$ with $R_{\mathrm{AA}}(non-strange)$, the heavy-light coalescence effect is more pronounced for the former one, resulting in an enhancement behavior in the range $2\lesssim p_{\mathrm{T}}\lesssim 5\mathrm{GeV}$. The predictions of $R_{\mathrm{AA}}(D_s^{+})$ and $R_{\mathrm{AA}}(non-strange)$ favor Model-A to have a better description of the measured $p_{\mathrm{T}}$ dependence in both energies, while their $v_2$ prefer Model-B at moderate $p_{\mathrm{T}}$ ($2\lesssim p_{\mathrm{T}}\lesssim 4\mathrm{GeV}$). Therefore, it is necessary to consider the temperature- and/or momentum-dependence of $2\pi T{D}_s$ to describe simultaneously $R_{\mathrm{AA}}(D_s^{+})$ and $v_2(D_s^{+})$ in different centrality classes in Pb--Pb collisions.

    hep-phPRC(2018)·10 citations
13. 13*

    Consequences of $\mu -\tau$ Reflection Symmetry at DUNE

    Newton Nath🇨🇳

    We consider minimal type-I seesaw framework to realize $\mu -\tau$ reflection symmetry in the low-energy neutrino mass matrix, $M_{\nu }$. Considering DUNE experiment, we scrutinize its potential to measure the precision of 2-3 mixing angle, ${\theta }_{23}$ and the Dirac CP-phase, $\delta$ for the given symmetry. Later, we examine the precision of these two parameters considering NuFit-3.2 data as one of the important true points. To study the low-energy phenomenology, we further discuss various breaking patterns of such an exact symmetry. Moreover, for each breaking scenario we perform the capability test of DUNE for the determination of ${\theta }_{23}$ and to establish the phenomenon of CP violation considering the true benchmark point arising from the breaking of $\mu -\tau$ reflection symmetry. We also make remarks on the potential of DUNE to rule out maximal CP-violation or CP-conservation hypothesis at a certain confidence level for different scenarios.

    hep-phPRD(2018)·22 citations
14. 14*

    Electroweak corrections in the 2HDM for neutral scalar Higgs-boson production through gluon fusion

    Laura Jenniches🇩🇪 · Christian Sturm🇩🇪 · Sandro Uccirati🇮🇹

    We have computed the two-loop, electroweak corrections to the production of a light and a heavy neutral, scalar Higgs-boson through the important gluon fusion process in the Two-Higgs-Doublet Model. We provide our results in various renormalization schemes for different scenarios and benchmark points, which will be valuable for experimental studies at the LHC. We describe the technicalities of our two-loop calculation and augment it by a phenomenological discussion. Our results are also applicable to the gluonic neutral, scalar Higgs-boson decays.

    hep-phJHEP(2018)·3 citations
15. 15*

    On the quark-gluon vertex at non-vanishing temperature

    Romain Contant🇦🇹 · Markus Q. Huber🇦🇹 · Christian S. Fischer🇩🇪 · Christian A. Welzbacher🇩🇪 · Richard Williams🇩🇪

    We perform a semi-perturbative calculation of the quark-gluon vertex inspired from the three-loop expanded 3PI effective action and investigate the relative strengths of the chirally symmetric/broken tensor structures below and above the crossover.

    hep-phActa Phys.Polon.Supp.(2018)·13 citations
16. 16*

    Lepton-rich cold quark matter

    J. C. Jiménez🇧🇷 · E. S. Fraga🇧🇷

    We explore protoneutron star matter in the framework of cold and dense QCD using the state-of-the-art perturbative equation of state including neutrinos fixed by a lepton fraction that is appropriate for this environment. Furthermore, we calculate the modifications in the lepton-rich equation of state showing that stable strange quark matter has a more restricted parameter space.

    hep-ph0 citations
17. 17*

    Incoherent vector mesons production in PbPb ultraperipheral collisions at the LHC

    Ya-Ping Xie🇨🇳 · Xurong Chen🇨🇳

    Incoherent rapidity distributions of vector mesons are computed in dipole model in PbPb ultraperipheral collisions at the CERN Large Hadron Collider (LHC). The IIM model fitted from newer data is employed in the dipole amplitude. The Boosted Gaussian and Gaus-LC wave functions for vector mesons are implemented in the calculation as well. Predictions for the $J/\psi$, $\psi (2s)$, $\rho$ and $\varphi$ incoherent rapidity distributions are evaluated and compared with experimental data and other theoretical predictions in this paper. We obtain closer predictions of the incoherent rapidity distributions for $J/\psi$ than previous calculations in the IIM model.

    hep-phNPA(2017)·13 citations
18. 18*

    Fiducial distributions in Higgs and Drell-Yan production at N${}^3$LL+NNLO

    Wojciech Bizon🇬🇧 · Xuan Chen🇨🇭 · Aude Gehrmann-De Ridder🇨🇭 · Thomas Gehrmann🇨🇭 · Nigel Glover🇬🇧 · Alexander Huss🇨🇭 · Pier Francesco Monni🇨🇭 · Emanuele Re🇨🇭 · Luca Rottoli🇬🇧 · Paolo Torrielli🇮🇹

    The perturbative description of certain differential distributions across a wide kinematic range requires the matching of fixed-order perturbation theory with resummation of large logarithmic corrections to all orders. We present precise matched predictions for transverse-momentum distributions in Higgs boson (H) and Drell-Yan pair (DY) production as well as for the closely related ${\varphi }_{\eta }^{\ast }$ distribution at the LHC. The calculation is exclusive in the Born kinematics, and allows for arbitrary fiducial selection cuts on the decay products of the colour singlets, which is of primary relevance for experimental analyses. Our predictions feature very small residual scale uncertainties and display a good convergence of the perturbative series. A comparison of the predictions for DY observables to experimental data at 8 TeV shows a very good agreement within the quoted errors.

    hep-phhep-exJHEP(2018)·172 citations
19. 19*

    Invisible Neutrino Decay Resolves IceCube's Track and Cascade Tension

    Peter B. Denton🇩🇰 · Irene Tamborra🇩🇰

    The IceCube Neutrino Observatory detects high energy astrophysical neutrinos in two event topologies: tracks and cascades. Since the flavor composition of each event topology differs, tracks and cascades can be used to test the neutrino properties and the mechanisms behind the neutrino production in astrophysical sources. Assuming a conventional model for the neutrino production, the IceCube data sets related to the two channels are in $>3\sigma$ tension with each other. Invisible neutrino decay with lifetime $\tau /m=10^2$ s/eV solves this tension. Noticeably, it leads to an improvement over the standard non-decay scenario of more than $3\sigma$ while remaining consistent with all other multi-messenger observations. In addition, our invisible neutrino decay model predicts a reduction of $59\%$ in the number of observed ${\nu }_{\tau }$ events which is consistent with the current observational deficit.

    hep-phastro-ph.HEPRL(2018)·103 citations
20. 20*

    Long-lived particles at the LHC: catching them in time

    Jia Liu🇺🇸 · Zhen Liu🇺🇸 · Lian-Tao Wang🇺🇸

    We explore the physics potential of using precision timing information at the LHC in searches for long-lived particles (LLPs). In comparison with the light Standard Model particles, the decay products of massive LLPs arrive at detectors with time delays around the nanosecond scale. We propose new strategies to take advantage of this time delay feature by using initial state radiation to timestamp the collision event and require at least one LLP to decay within the detector. This search strategy is effective for a broad range of models. In addition to outlining this general approach, we demonstrate its effectiveness with the projected reach for two benchmark scenarios: Higgs decaying into a pair of LLPs, and pair production of long-lived neutralinos in the gauge mediated supersymmetry breaking models. Our strategy increases the sensitivity to the lifetime of the LLP by two orders of magnitude or more and particularly exhibits a better behavior with a linear dependence on lifetime in the large lifetime region compared to traditional LLP searches. The timing information significantly reduces the Standard Model background and provides a powerful new dimension for LLP searches.

    hep-phhep-exPRL(2019)·118 citations
21. 21*

    Chemical potentials of light flavor quarks from yield ratios of negative to positive particles in Au+Au collisions at RHIC

    Ya-Qin Gao🇨🇳 · Hai-Ling Lao🇨🇳 · Fu-Hu Liu🇨🇳

    The transverse momentum spectra of ${\pi }^{-}$, ${\pi }^{+}$, $K^{-}$, $K^{+}$, $\bar{p}$, and $p$ produced in Au+Au collisions at center-of-mass energy $\sqrt{s_{NN}}=7.7$, 11.5, 19.6, 27, 39, 62.4, 130, and $200$ GeV are analyzed in the framework of a multisource thermal model. The experimental data measured at midrapidity by the STAR Collaboration are fitted by the (two-component) standard distribution. The effective temperature of emission source increases obviously with the increase of the particle mass and the collision energy. At different collision energies, the chemical potentials of up, down, and strange quarks are obtained from the antiparticle to particle yield ratios in given transverse momentum ranges available in experiments. With the increase of logarithmic collision energy, the chemical potentials of light flavor quarks decrease exponentially.

    ↳ nucl-thhep-exhep-phnucl-exAdv.High Energy Phys.(2018)·4 citations
22. 22*

    Axion dark matter and the 21-cm signal

    Pierre Sikivie🇺🇸

    It was shown in ref. [1] that cold dark matter axions reach thermal contact with baryons, and therefore cool them, shortly after the axions thermalize among themselves and form a Bose-Einstein condensate. The recent observation by the EDGES collaboration of a baryon temperature at cosmic dawn lower than expected under "standard" assumptions is interpreted as new evidence that the dark matter is axions, at least in part. Baryon cooling by dark matter axions is found to be consistent with the observation of baryon acoustic oscillations.

    ↳ astro-ph.COhep-phPhys.Dark Univ.(2019)·34 citations
23. 23*

    Scalar condensation behaviors around regular Neuman reflecting stars

    Yan Peng🇨🇳

    We study static massive scalar field condensations in the regular asymptotically flat reflecting star background. We impose Neumann reflecting surface boundary conditions for the scalar field. We show that the no hair theorem holds in the neutral reflecting star background. For charged reflecting stars, we provide bounds for radii of hairy reflecting stars. Below the lower bound, there is no regular compact reflecting star and a black hole will form. Above the upper bound, the scalar field cannot condense around the reflecting star or no hair theorems exist. And in between the bounds, we obtain scalar configurations supported by Neumann reflecting stars.

    ↳ gr-qchep-phhep-thNPB(2018)·16 citations
24. 24*

    Coherent deeply virtual Compton scattering off ${}^4$He

    Sara Fucini🇮🇹 · Sergio Scopetta🇮🇹 · Michele Viviani🇮🇹

    Coherent Deeply virtual Compton scattering off the ${}^4$He nucleus is studied in impulse approximation. A convolution formula for the nuclear Generalized Parton Distribution (GPD) is derived in terms of the ${}^4$He non-diagonal spectral function and of the GPD of the struck nucleon. A model of the nuclear non diagonal spectral function, based on the momentum distribution corresponding to the AV18 nucleon-nucleon interaction, is used in the actual calculation. Typical impulse approximation results are reproduced, in proper limits, for the nuclear form factor and for nuclear parton distributions. The nuclear generalized parton distribution and the Compton form factor are evaluated using, as nucleonic ingredient, a well known generalized parton distribution model. An overall very good agreement is found with the data recently published by the EG6 experiment at the Jefferson Laboratory (JLab). More refined nuclear calculations are addressed and will be necessary for the expected improved accuracy of the next generation of experiments at JLab, with the 12 GeV electron beam and high luminosity.

    ↳ nucl-thhep-phPRC(2018)·26 citations
25. 25*

    Dark Matter and Baryon Asymmetry from the very Dawn of Universe

    Eugeny Babichev🇫🇷 · Dmitry Gorbunov🇷🇺 · Sabir Ramazanov🇨🇿

    We propose a universal mechanism of producing dark matter and baryon (lepton) charge at the stage of the quasi-de Sitter expansion of the Universe---inflation. The key ingredient of the mechanism is a linear coupling of the field, responsible for generation of dark matter or baryon (lepton) charge, to a function of the inflaton. During inflation this induces almost constant force dragging the corresponding field to the non-zero value. This force explicitly breaks quantum numbers associated with dark matter/baryon abundance at later stages. As a particular realization of the mechanism we introduce a super-heavy complex scalar field with the mass larger than the Hubble rate during the last e-folds of inflation. The global U(1)-symmetry is violated due to the linear coupling of the phase of the complex scalar to the inflaton. The symmetry breaking leads to the generation of a non-zero Noether charge. The latter is directly related to the dark matter abundance, or, alternatively, can be converted into baryon asymmetry, if the complex scalar carries the baryon charge.

    ↳ astro-ph.COhep-phhep-thPRD(2018)·10 citations
26. 26*

    Late-time acceleration by a residual cosmological constant from sequestering vacuum energy in ultimate collapsed structures

    Lucas Lombriser🇨🇭

    The sequestering mechanism has been proposed as a remedy to the old cosmological constant problem of the non-gravitating vacuum energy in the matter sector. Here it is shown that an extension of this global constraint mechanism arises naturally from an averaging condition for residual cosmological constants produced in different patches of the Universe. The new mechanism naturally yields the small observed value that gives rise to cosmic acceleration at late times, hence, addressing the new cosmological constant problem. Hereby the halo model picture is adopted with all matter content ultimately residing in the last collapsed structures formed. Sequestering in these collapsing patches produces the desired average residual, where a uniform prior on our present location in the collapse predicts ${\Omega }_{\Lambda }=0.697$. Finally, a fluctuation of the local residual from the cosmological average can naturally give rise to a locally enhanced Hubble constant.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2019)·12 citations
27. 27*

    Superfluids and the Cosmological Constant Problem

    Justin Khoury🇺🇸 · Jeremy Sakstein🇺🇸 · Adam R. Solomon🇺🇸

    We introduce a novel method to circumvent Weinberg's no-go theorem for self-tuning the cosmological vacuum energy: a Lorentz-violating finite-temperature superfluid can counter the effects of an arbitrarily large cosmological constant. Fluctuations of the superfluid result in the graviton acquiring a Lorentz-violating mass and we identify a unique class of theories that are pathology free, phenomenologically viable, and do not suffer from instantaneous modes. This new and hitherto unidentified phase of massive gravity propagates the same degrees of freedom as general relativity with an additional Lorentz-violating scalar that is introduced by higher-derivative operators in a UV insensitive manner. The superfluid is therefore a consistent infrared modification of gravity. We demonstrate how the superfluid can degravitate a cosmological constant and discuss its phenomenology.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2018)·22 citations
28. 28*

    BlurRing

    Lydia Brenner🇳🇱 · Carsten Burgard🇩🇪

    A code package, BlurRing, is developed as a method to allow for multi-dimensional likelihood visualisation. From the BlurRing visualisation additional information about the likelihood can be extracted. The spread in any direction of the overlaid likelihood curves gives information about the uncertainty on the confidence intervals presented in the two-dimensional likelihood plots.

    ↳ physics.data-anhep-exhep-ph0 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.