Fri·May 31, 2019Friday·May 31, 2019

1. 01*

   The minimal stealth boson: models and benchmarks

   J.A. Aguilar-Saavedra🇪🇸 · F.R. Joaquim🇵🇹

   Stealth bosons are relatively light boosted particles with a cascade decay $S\to A_1{A}_2\to q\bar{q}q\bar{q}$, reconstructed as a single fat jet. In this work, we establish minimal extensions of the Standard Model that allow for such processes. Namely, we consider models containing a new (leptophobic) neutral gauge boson $Z^{\prime }$ and two scalar singlets, plus extra matter required to cancel the $\text{U}(1{)}^{\prime }$ anomalies. Our analysis shows that, depending on the model and benchmark scenario, the expected statistical significance of stealth boson signals (yet uncovered by current searches at the Large Hadron Collider) is up to nine times larger than for the most sensitive of the standard leptophobic $Z^{\prime }$ signals such as dijets, $t\bar{t}$ pairs or dibosons. These results provide strong motivation for model-independent searches that cover these complex signals.

   hep-phhep-exJHEP(2019)·13 citations
2. 02*

   Parton Energy Loss and the Generalized Jet Transport Coefficient

   Yuan-Yuan Zhang🇨🇳 · Guang-You Qin🇨🇳 · Xin-Nian Wang🇨🇳

   We revisit radiative parton energy loss in deeply inelastic scattering (DIS) off a large nucleus within the perturbative QCD approach. We calculate the gluon radiation spectra induced by double parton scattering in DIS without collinear expansion in the transverse momentum of initial gluons as in the original high-twist approach. The final radiative gluon spectrum can be expressed in terms of the convolution of hard partonic parts and unintegrated or transverse momentum dependent (TMD) quark-gluon correlations. The TMD quark-gluon correlation can be factorized approximately as a product of initial quark distribution and TMD gluon distribution which can be used to define the generalized or TMD jet transport coefficient. Under the static scattering center and soft radiative gluon approximation, we recover the result by Gylassy-Levai-Vitev (GLV) in the first order of the opacity expansion. The difference as a result of the soft radiative gluon approximation is investigated numerically under the static scattering center approximation.

   hep-phhep-thPRD(2019)·20 citations
3. 03*

   Higgs Parity Grand Unification

   Lawrence J. Hall🇺🇸 · Keisuke Harigaya🇺🇸

   The vanishing of the Higgs quartic coupling of the Standard Model at high energies may be explained by spontaneous breaking of Higgs Parity. Taking Higgs Parity to originate from the Left-Right symmetry of the $SO(10)$ gauge group, leads to a new scheme for precision gauge coupling unification that is consistent with proton decay. We compute the relevant running of couplings and threshold corrections to allow a precise correlation among Standard Model parameters. The scheme has a built-in solution for obtaining a realistic value for $m_b/m_{\tau }$, which further improves the precision from gauge coupling unification, allowing the QCD coupling constant to be predicted to the level of 1 % or, alternatively, the top quark mass to 0.2 %. Future measurements of these parameters may significantly constrain the detailed structure of the theory. We also study an $SO(10)$ embedding of quark and lepton masses, showing how large neutrino mixing is compatible with small quark mixing, and predict a normal neutrino mass hierarchy. The strong CP problem may be explained by combining Higgs Parity with space-time parity.

   hep-phhep-exJHEP(2019)·38 citations
4. 04*

   Composite Higgs at high transverse momentum

   Andrea Banfi🇬🇧 · Barry M. Dillon🇸🇮 · Wissarut Ketaiam🇬🇧 · Sandra Kvedaraitė🇬🇧

   In this paper we explore composite Higgs scenarios through the effects of light top-partners in Higgs+Jet production at the LHC. The pseudo-Goldstone boson nature of the Higgs field means that single-Higgs production via gluon fusion is insensitive to the mass spectrum of the top-partners. However in associated production this is not the case, and new physics scales may be probed. In the course of the work we consider scenarios with both one and two light top-partner multiplets in the spectrum of composite states. We study corrections to the Higgs couplings and the effects that the light top-partner multiplets have on the transverse momentum spectrum of the Higgs. Interestingly, we find that the corrections to the Standard Model expectation depend strongly on the representation of the top-partners in the global symmetry.

   hep-phJHEP(2020)·9 citations
5. 05*

   Extensive/nonextensive statistics for $p_T$ distributions of various charged particles produced in p+p and A+A collisions in a wide range of energies

   Abdel Nasser Tawfik (Nile U., ECTP and Johann Wolfgang Goethe-Universitat)🇪🇬 · Hayam Yassin🇪🇬 · Eman R. Abo Elyazeed (Ain Shams U., Cairo)🇪🇬

   We present a systematic study for the statistical fits of the transverse momentum distributions of charged pions, Kaons and protons produced at energies ranging between 7.7 and 2670 GeV to the extensive Boltzmann-Gibbs (BG) and the nonextensive statistics (Tsallis as a special type and the generic axiomatic nonextensive approach). We also present a comprehensive review on various experimental parametrizations proposed to fit the transverse momentum distributions of these produced particles. The inconsistency that the BG approach is to be utilized in characterizing the chemical freezeout, while the Tsallis approach in determining the kinetic freezeout is elaborated. The resulting energy dependence of the different fit parameters largely varies with the particle species and the degree of (non)extensivity. This manifests that the Tsallis nonextensive approach seems to work well for p+p rather than for A+A collisions. Drawing a complete picture of the utilization of Tsallis statistics in modeling the transverse momentum distributions of several charged particle produced at a wide range of energies and accordingly either disprove or though confirm the relevant works are main advantages of this review. We propose analytical expressions for the dependence of the fit parameters obtained on the size of the colliding system, the energy, as well as the types of the statistical approach applied. We conclude that the statistical dependence of the various fit parameters, especially between Boltzmann and Tsallis approaches could be understood that the statistical analysis ad hoc is biased to the corresponding degree of extensivity (Boltzmann) or nonextensivity (Tsallis). Alternatively, the empirical parameterizations, the other models, and the generic (non)extensive approach seem to relax this biasness.

   hep-phnucl-thUkr.J.Phys.(2022)·15 citations
6. 06*

   Almost-Entirely Empirical Estimation for Chemical Potential

   Abdel Nasser Tawfik (Nile U., ECTP and Johann Wolfgang Goethe-Universitat)🇪🇬 · Magda Abdel Wahab🇪🇬 · Hayam Yassin (Ain Shams U., Cairo)🇪🇬 · Hadeer Nasr El Din (Modern Academy for Engineering, Cairo)🇪🇬

   Based on statistical thermal approaches, the transverse momentum distribution of the well-identified produced particles, ${\pi }^{+}$, ${\pi }^{-}$, $K^{+}$, $K^{-}$, $p$, $\bar{p}$, is studied. From the partition function of grand-canonical ensemble, we propose a generic expression for the dependence of the full chemical potential $\mu$ on rapidity $y$. Then, by fitting this expression with the experimental results of most central $p_{\perp }$ and $d^{2}N/2\pi p_{\perp }d{p}_{\perp }dy$, at $7.7$, $11.5$, $19.6$, $27$, $39$, $130$, $200$GeV, we introduce a generic expression for the rapidity dependence of $\mu$, at different energies and particle types, $\mu =a+b{y}^2$. The resulting energy dependence reads $\sqrt{s_{\mathtt{NN}}}=c[(\mu -a)/b{]}^{d/2}$. As a validation check, the proposed approach reproduces, excellently, the rapidity spectra measured at different energies.

   hep-phnucl-thJ.Exp.Theor.Phys.(2020)·3 citations
7. 07*

   Is the $Y(2175)$ a Strangeonium Hybrid Meson?

   J. Ho🇨🇦 · R. Berg🇨🇦 · T. G. Steele🇨🇦 · W. Chen🇨🇳 · D. Harnett🇨🇦

   QCD Gaussian sum-rules are used to explore the vector ($J^{PC}=1^{--}$) strangeonium hybrid interpretation of the $Y(2175)$. Using a two-resonance model consisting of the $Y(2175)$ and an additional resonance, we find that the relative resonance strength of the $Y(2175)$ in the Gaussian sum-rules is less than 5\% that of a heavier 2.9 GeV state. This small relative strength presents a challenge to a dominantly-hybrid interpretation of the $Y(2175)$.

   hep-phPRD(2019)·36 citations
8. 08*

   Holographic Completion of Minimal Neutral Naturalness Model and Deconstruction

   Ling-Xiao Xu🇨🇳 · Jiang-Hao Yu🇨🇳 · Shou-hua Zhu🇨🇳

   We previously presented the minimal neutral naturalness model, in which neutral naturalness is realized with the minimal coset and the minimal field content in the color-neutral sector. To fully eliminating the cutoff dependence in the Higgs potential, its ultraviolet completion was laid out. In this work, we investigate in details the holographic realization in warped five-dimensional framework. Using the holographic method, we obtain the effective action on the UV brane and derive the finite Higgs potential, with the Higgs being a pseudo Nambu-Goldstone boson. The Higgs potential is fully radiatively generated and vacuum misalignment is naturally realized through only the fermionic contribution. To illustrate general features of the lowest Kaluza-Klein states, we construct the corresponding deconstructed two-site composite model.

   hep-ph8 citations
9. 09*

   Axial Vector $cc$ and $bb$ Diquark Masses from QCD Laplace Sum-Rules

   S. Esau🇨🇦 · A. Palameta🇨🇦 · R. T. Kleiv🇨🇦 · D. Harnett🇨🇦 · T. G. Steele🇨🇦

   Constituent mass predictions for axial vector (i.e., $J^P=1^{+}$) $cc$ and $bb$ colour antitriplet diquarks are generated using QCD Laplace sum-rules. We calculate the diquark correlator within the operator product expansion to NLO, including terms proportional to the four- and six-dimensional gluon and six-dimensional quark condensates. The sum-rules analyses stabilize, and we find that the mass of the $cc$ diquark is 3.51~GeV and the mass of the $bb$ diquark is 8.67~GeV. Using these diquark masses as inputs, we calculate several tetraquark masses within the Type-II diquark-antidiquark tetraquark model.

   hep-phPRD(2019)·20 citations
10. 10*

    Isgur-Wise function in $B_c$ decays to charmonium with the Bethe-Salpeter method

    Zi-Kan Geng🇨🇳 · Yue Jiang🇨🇳 · Tianhong Wang🇨🇳 · Hui-Wen Zheng🇨🇳 · Guo-Li Wang🇨🇳

    The Isgur-Wise function vastly reduces the weak-decay form factors of hadrons containing one heavy quark. In this paper, we extract the Isgur-Wise functions from the instantaneous Bethe-Salpeter method, and give the numerical results for the $B_c$ decays to charmonium where the final states include $1S$, $1P$, $2S$ and $2P$. The overlapping integral of the wave functions for the initial and final states is the Isgur-Wise function, as the heavy quark effective theory does. In the case of accurate calculation, describing form factors need to introduce more relativistic corrections which are the overlapping integrals with the relative momentum between the quark and antiquark to Isgur-Wise function. The relativistic corrections to Isgur-Wise function provide greater contributions especially involving the excited state, and therefore are necessary to be adopted.

    hep-phCPC(2021)·3 citations
11. 11*

    Confronting Tri-direct CP-symmetry models to neutrino oscillation experiments

    Gui-Jun Ding🇨🇳 · Yu-Feng Li🇨🇳 · Jian Tang🇨🇳 · Tse-Chun Wang🇨🇳

    Tri-direct CP symmetry is an economical neutrino model building paradigm, and it allows to describe neutrino masses, mixing angles and CP violation phases in terms of four free parameters. Viability of a class of tri-direct CP models is examined with a comprehensive simulation of current and future neutrino oscillation experiments. Two benchmark models as well as the full parameter space are carefully scanned, and the parameter degeneracy problem is observed from the constraint of one group of neutrino oscillation experiments. Complementary roles from the accelerator neutrino experiments (e.g., T2HK and DUNE) and reactor neutrino experiments (e.g., JUNO) are crucial to break the degeneracy and nail down fundamental neutrino mixing parameters of the underlying theory.

    hep-phhep-exPRD(2019)·7 citations
12. 12*

    Non-Resonant Searches for Axion-Like Particles at the LHC

    M. B. Gavela🇪🇸 · J. M. No🇪🇸 · V. Sanz🇬🇧 · J. F. de Trocóniz🇪🇸

    We propose a new collider probe for axion-like particles (ALPs), and more generally for pseudo-Goldstone bosons: non-resonant searches which take advantage of the derivative nature of their interactions with Standard Model particles. ALPs can participate as off-shell mediators in the $s$-channel of $2\to 2$ scattering processes at colliders like the LHC. We exemplify the power of this novel type of search by deriving new limits on ALP couplings to gauge bosons via the processes $pp\to ZZ$, $pp\to \gamma \gamma$ and $pp\to jj$ using Run 2 CMS public data, probing previously unexplored areas of the ALP parameter space. In addition, we propose future non-resonant searches involving the ALP coupling to other electroweak bosons and/or the Higgs particle.

    hep-phhep-exPRL(2020)·112 citations
13. 13*

    The effect of higher dimensional QCD operators on the spectroscopy of bottom-up holographic models

    S. S. Afonin🇷🇺

    Within the bottom-up holographic approach to QCD, the highly excited hadrons are identified with the bulk normal modes in the fifth "holographic" dimension. We show that additional states in the same mass range can appear also from taking into consideration the 5D fields dual to higher dimensional QCD operators. The possible effects of these operators were not taken into account in almost all phenomenological applications. Using the scalar case as the simplest example, we demonstrate that the additional higher dimensional operators lead to a large degeneracy of highly excited states in the Soft Wall holographic model while in the Hard Wall holographic model, they result in a proliferation of excited states. The considered model can be viewed as the first analytical toy-model predicting a one-to-one mapping of the excited meson states to definite QCD operators to which they prefer to couple.

    hep-phhep-thUniverse(2021)·6 citations
14. 14*

    Cosmic implications of a low-scale solution to the axion domain wall problem

    Andrea Caputo🇪🇸 · Mario Reig🇪🇸

    The post-inflationary breaking of Peccei-Quinn (PQ) symmetry can lead to the cosmic domain wall catastrophe. In this Letter we show how to avoid domain walls implementing the Instanton Interference Effect (IIE) with a new interaction which itself breaks PQ symmetry and confines at an energy scale smaller than ${\Lambda }_{QCD}$. We give a general description of the mechanism and consider its cosmological implications and constraints within a minimal model. Contrary to other mechanisms we do not require an inverse phase transition neither fine-tuned bias terms. Incidentally, the mechanism leads to the introduction of new self-interacting dark matter candidates and the possibility of producing gravitational waves in the frequency range of SKA. Unless a fine-tuned hidden sector is introduced, the mechanism predicts a QCD axion in the mass range $1\text{ meV}-15\text{ meV}$.

    hep-phastro-ph.COPRD(2019)·41 citations
15. 15*

    Deciphering the XYZ States

    M.B. Voloshin🇺🇸

    I give a brief account of current topics in description of exotic multiquark mesonic resonances with hidden heavy ($c$ or $b$) flavor, the so-called XYZ states, in terms of hadronic molecules and hadro-quarkonium systems. Also discussed are the recently observed hidden-charm pentaquarks including additional ways of producing them in experiments.

    hep-phhep-ex9 citations
16. 16*

    Dispersion relations for ${\gamma }^{\ast }{\gamma }^{\ast }\to \pi \pi$: helicity amplitudes, subtractions, and anomalous thresholds

    Martin Hoferichter🇺🇸 · Peter Stoffer🇺🇸

    We present a comprehensive analysis of the dispersion relations for the doubly-virtual process ${\gamma }^{\ast }{\gamma }^{\ast }\to \pi \pi$. Starting from the Bardeen-Tung-Tarrach amplitudes, we first derive the kernel functions that define the system of Roy-Steiner equations for the partial-wave helicity amplitudes. We then formulate the solution of these partial-wave dispersion relations in terms of Omnès functions, with special attention paid to the role of subtraction constants as critical for the application to hadronic light-by-light scattering. In particular, we explain for the first time why for some amplitudes the standard Muskhelishvili-Omnès solution applies, while for others a modified approach based on their left-hand cut is required unless subtractions are introduced. In the doubly-virtual case, the analytic structure of the vector-resonance partial waves then gives rise to anomalous thresholds, even for space-like virtualities. We develop a strategy to account for these effects in the numerical solution, illustrated in terms of the $D$-waves in ${\gamma }^{\ast }{\gamma }^{\ast }\to \pi \pi$, which allows us to predict the doubly-virtual responses of the $f_2(1270)$ resonance. In general, our results form the basis for the incorporation of two-meson intermediate states into hadronic light-by-light scattering beyond the $S$-wave contribution.

    hep-phhep-exnucl-thJHEP(2019)·88 citations
17. 17*

    Explaining the ANITA Anomaly with Inelastic Boosted Dark Matter

    Lucien Heurtier🇺🇸 · Doojin Kim🇺🇸 · Jong-Chul Park🇰🇷 · Seodong Shin🇰🇷

    We propose a new physics scenario in which the decay of a very heavy dark-matter candidate which does not interact with the neutrino sector could explain the two anomalous events recently reported by ANITA. The model is composed of two components of dark matter, an unstable dark-sector state, and a massive dark gauge boson. We assume that the heavier dark-matter particle of EeV-range mass is distributed over the galactic halo and disintegrates into a pair of lighter -- highly boosted -- dark-matter states in the present universe which reach and penetrate the Earth. The latter scatters {\it in}elastically off a nucleon and produces a heavier dark-sector unstable state which subsequently decays back to the lighter dark matter along with hadrons, which induce Extensive Air Showers, via on-/off-shell dark gauge boson. Depending on the mass hierarchy within the dark sector, either the dark gauge boson or the unstable dark-sector particle can be long-lived, hence transmitted significantly through the Earth. We study the angular distribution of the signal and show that our model favors emergence angles in the range $\sim 25^{\circ }-35^{\circ }$ if the associated parameter choices bear the situation where the mean free path of the boosted incident particle is much larger than the Earth diameter while its long-lived decay product has a decay length of dimensions comparable to the Earth radius. Our model, in particular, avoids any constraints from complementary neutrino searches such as IceCube or the Auger observatory.

    hep-phastro-ph.COastro-ph.HEhep-exPRD(2019)·48 citations
18. 18*

    The Curious Case of Leading Transcendentality: Three Point Form Factors

    Taushif Ahmed🇩🇪 · Pulak Banerjee🇨🇭 · Amlan Chakraborty🇮🇳 · Prasanna K. Dhani🇮🇹 · V. Ravindran🇮🇳

    Form factors are important ingredients to investigate the principle of maximal transcendentality (PMT) and to extract anomalous dimensions of local gauge invariant operators. In this article, we compute several two- and three-point FFs to three- and two-loops, respectively, for three different choices of local gauge invariant operators in $\mathcal{N}=4$ super Yang-Mills (SYM) theory. The operators ${\mathcal{O}}^1$ and ${\mathcal{O}}^2$ are flavour and helicity blind configurations of supersymmetric descendant of the half-BPS and Konishi primary, respectively, and ${\mathcal{O}}^3$ is the energy-momentum tensor. The operators ${\mathcal{O}}^1$ and ${\mathcal{O}}^2$ are composed of non-protected dimension-three (classical) fermionic and scalar components belonging to SU($2|3$) closed sub-sector of $\mathcal{N}=4$ SYM. We analyse the mixing among the non-protected fermionic and scalar components of these operators up to three-loops in perturbation theory and consequently, compute the quantum corrections to the corresponding dilatation operators. The highest transcendental (HT) weight terms of the FFs of ${\mathcal{O}}^1$ are found to be independent of the external on-shell states and, moreover, those are equal to that of half-BPS, however, this does not hold true for the FFs of ${\mathcal{O}}^2$. FFs of the ${\mathcal{O}}^3$ exhibit identical behaviours to that of half-BPS, in concordance with the classical expectations. However, the three-point FFs of ${\mathcal{O}}^3$ violate the PMT while comparing with the corresponding quantity in the standard model, observed for the first time at the level of FF.

    ↳ hep-thhep-ph6 citations
19. 19*

    Analytic crystals of solitons in the four dimensional gauged non-linear sigma model

    Fabrizio Canfora🇨🇱 · Seung Hun Oh🇰🇷 · Aldo Vera🇨🇱

    The first analytic topologically non-trivial solutions in the (3+1)-dimensional gauged non-linear sigma model representing multi-solitons at finite volume with manifest ordered structures generating their own electromagnetic field are presented. The complete set of seven coupled non-linear field equations of the gauged non-linear sigma model together with the corresponding Maxwell equations are reduced in a self-consistent way to just one linear Schrodinger-like equation in two dimensions. The corresponding two dimensional periodic potential can be computed explicitly in terms of the solitons profile. The present construction keeps alive the topological charge of the gauged solitons. Both the energy density and the topological charge density are periodic and the positions of their peaks show a crystalline order. These solitons describe configurations in which (most of) the topological charge and total energy are concentrated within three-dimensional tube-shaped regions. The electric and magnetic fields vanish in the center of the tubes and take their maximum values on their surface while the electromagnetic current is contained within these tube-shaped regions. Electromagnetic perturbations of these families of gauged solitons are shortly discussed.

    ↳ hep-thhep-phnucl-thEPJC(2019)·37 citations
20. 20*

    Bounding the mass of graviton in a dynamic regime with binary pulsars

    Xueli Miao🇨🇳 · Lijing Shao🇨🇳 · Bo-Qiang Ma🇨🇳

    In Einstein's general relativity, gravity is mediated by a massless spin-2 metric field, and its extension to include a mass for the graviton has profound implication for gravitation and cosmology. In 2002, Finn and Sutton used the gravitational-wave (GW) back-reaction in binary pulsars, and provided the first bound on the mass of graviton. Here we provide an improved analysis using 9 well-timed binary pulsars with a phenomenological treatment. First, individual mass bounds from each pulsar are obtained in the frequentist approach with the help of an ordering principle. The best upper limit on the graviton mass, $m_g<3.5\times 10^{-20}\mathrm{eV}/c^2$ (90% C.L.), comes from the Hulse-Taylor pulsar PSR B1913+16. Then, we combine individual pulsars using the Bayesian theorem, and get $m_g<5.2\times 10^{-21}\mathrm{eV}/c^2$ (90% C.L.) with a uniform prior for $\ln m_g$. This limit improves the Finn-Sutton limit by a factor of more than 10. Though it is not as tight as those from GWs and the Solar System, it provides an independent and complementary bound from a dynamic regime.

    ↳ astro-ph.COastro-ph.HEgr-qchep-phPRD(2019)·25 citations
21. 21*

    Dependence of accessible dark matter annihilation cross-sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

    Nagisa Hiroshima🇯🇵 · Masaaki Hayashida🇯🇵 · Kazunori Kohri🇯🇵

    Dwarf spheroidal galaxies are excellent targets in gamma-ray searches for dark matter. We consider dark matter searches in dwarf spheroidal galaxies (dSphs) with the Cherenkov Telescope Array (CTA). The aim of this work is to reveal a quantitative and precise dependence of the accessible dark matter annihilation cross-sections on the dark matter density profiles of dSphs and on the distance to them. In most data analyses, researchers have assumed point-like signals from dSphs because it is difficult to resolve the expected emission profiles with current gamma-ray observatories. In future however, CTA will be able to resolve the peak emission profiles in dSphs. We take several variations of the dark matter density profile of Draco dSph as examples and analyze the simulated observations of with CTA. We derive the accessible region of the dark matter annihilation cross-section with each dark matter density profile. The accessible region of the annihilation cross-section can differ by a factor of 10 among plausible profiles. We also examine the dependence on the distance to the target dSphs by assuming the same profiles of dSphs at different distances. Closer targets are better due to the higher J-factor, while their spatial extension significantly degrades our reach to the annihilation cross-section compared to the value expected from a simple distance-scaling of the J-factor. Spatial extension of the source affects the probable parameter region in energy-dependent ways. In some gamma-ray energy ranges, this behaviour becomes moderately dependent on the properties of the observation facility.

    ↳ astro-ph.HEastro-ph.COhep-phPRD(2019)·13 citations
22. 22*

    A Test of Bolometric Properties of Tm-containing Crystals as a Perspective Detector for the Solar Axion Search

    E. Bertoldo🇩🇪 · A. V. Derbin🇷🇺 · I. S. Drachnev🇷🇺 · M. Laubenstein🇮🇹 · D. A. Lis🇷🇺 · M. Mancuso🇩🇪 · V. N. Muratova🇷🇺 · S. Nagorny🇨🇦 · S. Nisi🇮🇹 · F. Petricca🇩🇪 · V. V. Ryabchenkov🇷🇺 · S. E. Sarkisov🇷🇺 and 4 other authors

    The ${}^{169}$Tm nuclide has first nuclear level at 8.41 keV with magnetic type transition to the ground state and, therefore, can be used as a target nucleus for the search of resonant absorption of solar axions. We plan to use a Tm-containing crystal of a garnet family Tm${}_3$Al${}_5$O${}_{12}$ as a bolometric detector in order to search for the excitation of the first nuclear level of ${}^{169}$Tm via the resonant absorption of solar axions. With this perspective in mind, a sample of the Tm${}_3$Al${}_5$O${}_{12}$ crystal was grown and tested for its bolometric and optical properties. Measurements of chemical and/or radioactive contaminations were performed as well. In this paper we present the test results and estimate the requirements for a future low-background experimental setup.

    ↳ physics.ins-detastro-ph.COhep-exhep-phNucl.Instrum.Meth.A(2020)·5 citations
23. 23*

    Multi-band gravitational wave tests of general relativity

    Zack Carson🇺🇸 · Kent Yagi🇺🇸

    The violent collisions of black holes provide for excellent test-beds of Einstein's general relativity in the strong/dynamical gravity regime. We here demonstrate the resolving power one can gain upon the use of multi-band observations of gravitational waves from both ground- and space-based detectors. We find significant improvement in both generic parameterized tests of general relativity and consistency tests of inspiral-merger-ringdown parts of the waveform over single-band detections. Such multi-band observations are crucial for unprecedented probes of e.g. parity-violation in gravity.

    ↳ gr-qcastro-ph.HEhep-phhep-thClass.Quant.Grav.(2020)·65 citations
24. 24*

    Ultra-diffuse galaxies without dark matter

    Joseph Silk🇫🇷

    I develop a high velocity galaxy collision model to explain a rare but puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies with little dark matter. Predictions include simultaneous triggering of overpressured dense clouds to form luminous old globular clusters, a protogroup environment to generate high relative velocities of the initially gas-rich galaxies in the early universe, and spatially separated dark halos, possibly detectable via gravitational lensing and containing relic low metallicity stars with enhanced [alpha/Fe] at ultralow surface brightness.

    ↳ astro-ph.GAastro-ph.COhep-phMNRAS(2019)·39 citations
25. 25*

    Holographic entanglement entropy and generalized entanglement temperature

    Ashis Saha🇮🇳 · Sunandan Gangopadhyay🇮🇳 · Jyoti Prasad Saha🇮🇳

    In this work we study the flow of holographic entanglement entropy in dimensions $d\ge 3$ in the gauge/gravity duality set up. We observe that a generalized entanglement temperature $T_g$ can be defined which gives the Hawking temperature $T_H$ in the infrared region and leads to a generalized thermodynamics like law $E=\left(\frac{d-1}{d}\right)T_g{S}_{REE}$, which becomes an exact relation in the entire region of the subsystem size $l$, including both the infrared ($l\to \infty$) as well as the ultraviolet ($l\to 0$) regions. Furthermore, in the IR limit, $T_g$ produces the Hawking temperature $T_H$ along with some correction terms which bears the signature of short distance correlations along the entangling surface. Moreover, for $d\ge 3$, the IR limit of the renormalized holographic entanglement entropy gives the thermal entropy of the black hole as the leading term, however, does not have a logarithmic correction to the leading term unlike the BTZ black hole ($d=2$) case. The generalized entanglement temperature $T_g$ also firmly captures the quantum mechanical to thermal crossover in the dual field theory at a critical value $l_c$ of the subsystem size in the boundary which we graphically represent for $Ad{S}_{3+1}$ and $Ad{S}_{4+1}$ black holes. We observe that this critical value $l_c$ where the crossover takes place decreases with increase in the dimension of the spacetime.

    ↳ hep-thhep-phPRD(2019)·17 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.