Tue·Feb 16, 2016Tuesday·February 16, 2016

1. 01*

   Models of LHC Diphoton Excesses Valid up to the Planck scale

   Yuta Hamada🇯🇵 · Hikaru Kawai🇯🇵 · Kiyoharu Kawana🇯🇵 · Koji Tsumura🇯🇵

   We discuss a possibility to explain the LHC diphoton excesses at $750$GeV by the new scalar $X$ that couples to the gauge bosons through the loop of new massive particles with Standard Model charges. We assume that the new particles decay into the Standard Model particles at the tree level. We systematically examine the models that preserve the vacuum stability and the perturbativity up to the Planck scale. When we take scalars for the new particles, we find that only a few diquark and dilepton models can explain the observed diphoton cross section without conflicting the experimental mass bounds. When we take vector-like fermions for the new particles, we find rather different situations depending on whether their couplings to $X$ are scalar or pseudoscalar type. In the former case, a few models are allowed if we introduce only one species of fermions. The more fermions we introduce, the more models are allowed. In the later case, the most of the models are allowed because of the large coupling between $X$ and photon. It is interesting that the allowed mass regions of the scalar particles might be reached by the next lepton colliders.

   hep-phPRD(2016)·42 citations
2. 02*

   Factorization theorem, gluon poles and new contributions in semi-inclusive processes

   I.V. Anikin🇷🇺 · O.V. Teryaev🇷🇺

   We discuss the role of gluon poles and the gauge invariance for the hadron tensors of Drell-Yan and direct photon production processes with the transversely polarized hadron.

   hep-phEPJ Web Conf.(2016)·0 citations
3. 03*

   Probing the Scale of New Physics by Advanced LIGO/VIRGO

   P. S. Bhupal Dev🇩🇪 · A. Mazumdar🇬🇧

   We show that if the new physics beyond the Standard Model is associated with a first-order phase transition around $10^7-10^8$ GeV, the energy density stored in the resulting stochastic gravitational waves and the corresponding peak frequency are within the projected final sensitivity of the advanced LIGO/VIRGO detectors. We discuss some possible new physics scenarios that could arise at such energies, and in particular, the consequences for Peccei-Quinn and supersymmetry breaking scales.

   hep-phastro-ph.COgr-qcPRD(2016)·131 citations
4. 04*

   Implications of the 750 GeV Diphoton Excess in Gaugino Mediation

   Chengcheng Han🇯🇵 · Tsutomu T. Yanagida🇯🇵 · Norimi Yokozaki🇮🇹

   The 750 GeV diphoton excess reported by ATLAS and CMS indicates the presence of several pairs of the vector-like matter multiplets around TeV scale. If that is the case, radiative corrections from the $SU(3)$ gauge interaction significantly change from those of MSSM, and the infrared-free nature of the gauge interaction leads to characteristic SUSY mass spectra: a ratio of a squark mass to the gluino mass, and scalar trilinear couplings are enhanced at the low-energy scale. Consequently, even in gaugino mediation models, the Higgs boson mass of 125 GeV is explained with the fairly light gluino of 2-3 TeV, which can be accessible at the LHC.

   hep-phhep-exPRD(2016)·31 citations
5. 05*

   Flavor and CP symmetries for leptogenesis and 0nubb decay

   Claudia Hagedorn🇩🇰 · Emiliano Molinaro🇩🇰

   We perform a comprehensive analysis of the phenomenology of leptonic low and high energy CP phases in a scenario with three heavy right-handed neutrinos in which a flavor and a CP symmetry are non-trivially broken. All CP phases as well as lepton mixing angles are determined by the properties of the flavor and CP symmetry and one free real parameter. We focus on the generation of the baryon asymmetry Y_B of the Universe via unflavored leptogenesis and the predictions of m_ee, the quantity measurable in neutrinoless double beta decay. We show that the sign of Y_B can be fixed and the allowed parameter range of m_ee can be strongly constrained. We argue on general grounds that the CP asymmetries epsilon_i are dominated by the contribution associated with one Majorana phase and that in cases in which only the Dirac phase is non-trivial the sign of Y_B depends on further parameters. In addition, we comment on the case of flavored leptogenesis where in general the knowledge of the CP phases and light neutrino mass spectrum is also not sufficient in order to fix the sign of the CP asymmetries. As examples we discuss the series of flavor groups Delta (3 n^2) and Delta (6 n^2), n >= 2 integer, and several classes of CP transformations.

   hep-phNPB(2017)·61 citations
6. 06*

   Cannibal Dark Matter

   Duccio Pappadopulo🇺🇸 · Joshua T. Ruderman🇺🇸 · Gabriele Trevisan🇺🇸

   A thermally decoupled hidden sector of particles, with a mass gap, generically enters a phase of cannibalism in the early Universe. The Standard Model sector becomes exponentially colder than the hidden sector. We propose the Cannibal Dark Matter framework, where dark matter resides in a cannibalizing sector with a relic density set by 2-to-2 annihilations. Observable signals of Cannibal Dark Matter include a boosted rate for indirect detection, new relativistic degrees of freedom, and warm dark matter.

   hep-phastro-ph.COPRD(2016)·179 citations
7. 07*

   Beyond the Standard Model

   Csaba Csáki🇺🇸 · Philip Tanedo🇺🇸

   We introduce aspects of physics beyond the Standard Model focusing on supersymmetry, extra dimensions, and a composite Higgs as solutions to the Hierarchy problem. Lectures at the European School of High Energy Physics, Parádfürdő, Hungary, 5-18 June 2013.

   hep-ph2013 European School of High-Energy Physi…·97 citations
8. 08*

   Perturbative unification of gauge couplings in supersymmetric $E_6$ models

   Gi-Chol Cho🇯🇵 · Nobuhito Maru🇯🇵 · Kaho Yotsutani🇯🇵

   We study gauge coupling unification in supersymmetric $E_6$ models where an additional $\mathrm{U}(1{)}^{\prime }$ gauge symmetry is broken near the TeV scale and a number of exotic matter fields from the $27$ representations have $O(\mathrm{TeV})$ mass. Solving the 2-loop renormalization group equations of gauge couplings and a kinetic mixing coupling between the $\mathrm{U}(1{)}^{\prime }$ and $\mathrm{U}(1{)}_Y$ gauge fields, we find that the gauge couplings fall into the non-perturbative regime below the GUT scale. We examine threshold corrections on the running of gauge couplings from both light and heavy ($\sim$ GUT scale) particles and show constraints on the size of corrections to achieve the perturbative unification of gauge couplings.

   hep-phMod.Phys.Lett.A(2016)·5 citations
9. 09*

   Schwinger-Dyson Equation in Minkowski Space beyond the IE Approximation

   Shuji Sasagawa🇯🇵 · Hidekazu Tanaka🇯🇵

   We investigate the properties of fermion mass functions in quantum electrodynamics calculated by the Schwinger-Dyson equation in the strong coupling region, in which the loop integration is performed in Minkowski space. The calculated results without the instantaneous exchange approximation are compared with those obtained by integration in Euclidean space.

   hep-phPTEP(2017)·4 citations
10. 10*

    Radiative Decays of the $X(3872)$ in the Charmonium-Molecule Hybrid Picture

    Sachiko Takeuchi🇯🇵 · Makoto Takizawa🇯🇵 · Kiyotaka Shimizu🇯🇵

    The X(3872) radiative decay is discussed by employing a two-meson multichannel model with the charmonium components, which explains many of the other observed features of X(3872). We have found that the ratio of the branching fractions of the X(3872) radiative decays, $R_{\gamma }=\text{Br}(X(3872)\to \psi (2S)\gamma )$ / Br$(X(3872)\to J/\psi \gamma )$, is 1.1 $\sim$ 3.4 if one assumes that the decay occurs only from the charmonium components. The invariant mass spectra of $c{c}^{bar}$($2P$)$\to J/\psi \gamma$ and $c{c}^{bar}$($2P$)$\to \psi (2S)\gamma$ are also investigated. It is found that an enhancement appears at around $E\sim 3960$ MeV in the $\psi (2S)\gamma$ spectrum but not in the $J/\psi \gamma$ spectrum. This corresponds to the missing $c{c}^{bar}$($2P$) pole which was predicted by the quark models but has not been observed due to the coupling to the $D{D}^{bar}$ states. We argue that the fluctuation seen in the experimental $\psi (2S)\gamma$ spectrum reported by LHCb may correspond to this $c{c}^{bar}$($2P$) pole.

    hep-phJPS Conf.Proc.(2017)·7 citations
11. 11*

    Exotic Higgs decays in U(1) extensions of the MSSM

    P. Athron🇦🇺 · M. Muhlleitner🇩🇪 · R. Nevzorov🇦🇺 · A.G. Williams🇦🇺

    We study the decays of the lightest CP-even Higgs boson into a pair of pseudoscalar Higgs states within U(1)_N extensions of the MSSM.

    hep-ph13 citations
12. 12*

    Jet tomography in heavy-ion collisions -- Challenges, Results, and Open Problems

    Barbara Betz🇩🇪

    Over the past 30 years, jet observables have proven to provide important information about the quark-gluon plasma created in heavy-ion collisions. I review the challenges, results, and open problems of jet physics in heavy-ion collisions, discussing the main ideas as well as some most recent results focussing on two major jet observables, the nuclear modification factor and the high-pT elliptic flow.

    hep-phnucl-exnucl-th0 citations
13. 13*

    Beta-Decay Correlations in the LHC Era

    Kazimierz Bodek🇵🇱

    Neutron and nuclear beta decay correlation coefficients are linearly sensitive to the exotic scalar and tensor interactions that are not included in the Standard Model. The proposed experiment will measure simultaneously 11 neutron correlation coefficients ($a$, $A$, $B$, $D$, $H$, $L$, $N$, $R$, $S$, $U$, $V$) where 5 of them ($H$, $L$, $S$, $U$, $V$) were never addressed before. Silicon pixel detectors are considered as promising alternative to multi-wire gas chambers devoted for electron tracking in the original setup. The expected sensitivity limits for ${ϵ}_S$ and ${ϵ}_T$ -- EFT parameters describing the scalar and tensor contributions to be extracted from the transverse electron polarization related coefficients $H$, $L$, $N$, $R$, $S$, $U$, $V$ are discussed.

    hep-phActa Phys.Polon.B(2016)·8 citations
14. 14*

    Nonlocal Nambu-Jona-Lasinio model and chiral chemical potential

    Marco Frasca🇮🇹

    We derive the critical temperature in a nonlocal Nambu-Jona-Lasinio model with the presence of a chiral chemical potential. The model we consider uses a form factor derived from recent studies of the gluon propagator in Yang-Mills theory and has the property to fit in excellent way the form factor arising from the instanton liquid picture for the vacuum of the theory. Nambu-Jona-Lasinio model is derived form quantum chromodynamics providing all the constants of the theory without any need for fits. We show that the critical temperature in this case always exists and increases as the square of the chiral chemical potential. The expression we obtain for the critical temperature depends on the mass gap that naturally arises from Yang-Mills theory at low-energy as also confirmed by lattice computations.

    hep-phhep-latEPJC(2018)·18 citations
15. 15*

    Exploring the Anomalous Top-Higgs FCNC Couplings at the electron proton colliders

    Hao Sun · Xuan Luo · Jing Li

    We perform an updated analysis on the searches for the anomalous FCNC Yukawa interactions between the top quark, the Higgs boson, and either an up or charm quark ($\mathrm{tqh},\mathrm{q}=\mathrm{u},\mathrm{c}$). We probe the observability of the FCNC top-Higgs couplings through the processes ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\bar{\mathrm{t}}\to {\nu }_{\mathrm{e}}\mathrm{h}\bar{\mathrm{q}}$ (signal.I) and ${\mathrm{e}}^{-}\mathrm{p}\to {\nu }_{\mathrm{e}}\mathrm{hb}$ (singal.II) at the proposed electron proton (ep) colliders, where the Higgs boson decays to a $\mathrm{b}\bar{\mathrm{b}}$ pair. We find that at the high luminosity (1 $\mathrm{a}{\mathrm{b}}^{-1}$) ep colliders where the electrons have a polarisation of $80\%$ and electron energy is typical 60 GeV, the 2$\sigma$ upper limit on $\mathrm{Br}(\mathrm{t}\to \mathrm{uh})$ are $0.15\times 10^{-2}$($2.9\times 10^{-4}$) at the 7TeV@LHeC(50TeV@FCC-eh) for signal.I and $0.15\times 10^{-2}$($2.2\times 10^{-4}$) for signal.II. We also give an estimate on how the sensitivity (take signal.I as examples) would change when we reduce the electron beam energy from 60 GeV to 50 GeV or even 40 GeV due to the cost reason. The conclusion is that the discovery potential reduce $8.7\%$($29.4\%$) if the electron beam change from 60GeV to 50(40) GeV at the 7TeV LHeC, and $16.8\%$($19.8\%$) at the 50 TeV FCC-eh.

    hep-phEPJC(2018)·24 citations
16. 16*

    Towards Diffraction in Herwig

    Stefan Gieseke🇩🇪 · Frasher Loshaj🇩🇪 · Miroslav Myska🇨🇿

    We propose changes to the colour reconnection model in the Monte Carlo event generator Herwig in order to remove the quasi diffractive events from the soft multiple parton interactions. We then implement explicitly soft diffraction and show some preliminary results.

    hep-ph7 citations
17. 17*

    Photons, Photon Jets and Dark Photons at 750 GeV and Beyond

    Basudeb Dasgupta (TIFR Mumbai)🇮🇳 · Joachim Kopp (MITP Mainz)🇩🇪 · Pedro Schwaller (DESY Hamburg)🇩🇪

    In new physics searches involving photons at the LHC, one challenge is to distinguish scenarios with isolated photons from models leading to "photon jets". For instance, in the context of the 750 GeV diphoton excess, it was pointed out that a true diphoton resonance $S\to \gamma \gamma$ can be mimicked by a process of the form $pp\to S\to aa\to 4\gamma$, where $S$ is a new scalar with a mass of 750 GeV and $a$ is a light pseudoscalar decaying to two collinear photons. Photon jets can be distinguished from isolated photons by exploiting the fact that a large fraction of photons convert to an $e^{+}{e}^{-}$ pair inside the inner detector. In this note, we quantify this discrimination power, and we study how the sensitivity of future searches differs for photon jets compared to isolated photons. We also investigate how our results depend on the lifetime of the particle(s) decaying to the photon jet. Finally, we discuss the extension to $S\to A^{\prime }{A}^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-}$, where there are no photons at all but the dark photon $A^{\prime }$ decays to $e^{+}{e}^{-}$ pairs. Our results will be useful in future studies of the putative 750 GeV signal, but also more generally in any new physics search involving hard photons.

    hep-phhep-exEPJC(2016)·43 citations
18. 18*

    Masses of doubly charmed baryons in the extended on-mass-shell renormalization scheme

    Zhi-Feng Sun🇪🇸 · M. J. Vicente Vacas🇪🇸

    In this work, we investigate the mass corrections of the doubly charmed baryons up to $N^{2}LO$ in the extended-on-mass-shell (EOMS) renormalization scheme, comparing with the results of heavy baryon chiral perturbation theory. We find that the terms from the heavy baryon approach are a subset of those obtained in the EOMS scheme. By fitting the lattice data, we can determine the parameters $\tilde{m}$, $\alpha$, $c_1$ and $c_7$ from the Lagrangian, while in the heavy baryon approach no information on $c_1$ can be obtained from the baryons mass. Correspondingly, the masses of $m_{{\Xi }_{cc}}$ and $m_{{\Omega }_{cc}}$ are predicted, in the EOMS scheme, extrapolating the results from different values of the charm quark and the pion masses of the lattice QCD calculations.

    hep-phhep-latPRD(2016)·43 citations
19. 19*

    Updates on the Studies of $N^{\ast }$ Structure with CLAS and the Prospects with CLAS12

    V. I. Mokeev🇺🇸

    The recent results on ${\gamma }_{v}p{N}^{\ast }$ electrocouplings from analyses of the data on exclusive meson electroproduction off protons measured with the CLAS detector at Jefferson Lab are presented. The impact of these results on the exploration of the excited nucleon state structure and non-perturbative strong interaction dynamics behind its formation is outlined. The future extension of these studies in the experiments with the CLAS12 detector in the upgraded Hall-B at JLab will provide for the first time ${\gamma }_{v}p{N}^{\ast }$ electrocouplings of all prominent resonances at the still unexplored distance scales that correspond to extremely low (0.05 GeV${}^2<Q^2<$ 0.5 GeV${}^2$) and the highest photon virtualities (5.0 GeV${}^2<Q^2<$ 12.0 GeV${}^2$) ever achieved in the exclusive electroproduction measurements. The expected results will address the most important open problems of the Standard Model: on the nature of more than 98\% of hadron mass, quark-gluon confinement and emergence of the excited nucleon state structure from the QCD Lagrangian, as well as allowing a search for the new states of hadron matter predicted from the first principles of QCD, the so-called hybrid baryons.

    ↳ nucl-exhep-exhep-phFew Body Syst.(2016)·8 citations
20. 20*

    Evolution of the jet opening angle distribution in holographic plasma

    Krishna Rajagopal🇺🇸 · Andrey V. Sadofyev🇺🇸 · Wilke van der Schee🇺🇸

    We use holography to analyze the evolution of an ensemble of jets, with an initial probability distribution for their energy and opening angle as in proton-proton (pp) collisions, as they propagate through an expanding cooling droplet of strongly coupled plasma as in heavy ion collisions. We identify two competing effects: (i) each individual jet widens as it propagates; (ii) the opening angle distribution for jets emerging from the plasma within any specified range of energies has been pushed toward smaller angles, comparing to pp jets with the same energies. The second effect arises because small-angle jets suffer less energy loss and because jets with a higher initial energy are less probable in the ensemble. We illustrate both effects in a simple two-parameter model, and find that their consequence in sum is that the opening angle distribution for jets in any range of energies contains fewer narrow and wide jets. Either effect can dominate in the mean opening angle, for not unreasonable values of the parameters. So, the mean opening angle for jets with a given energy can easily shift toward smaller angles, as experimental data may indicate, even while every jet in the ensemble broadens.

    ↳ nucl-thhep-phhep-thnucl-exPRL(2016)·70 citations
21. 21*

    Tighter bounds on a hypothetical graviton screening mass from the gravitational wave observation GW150914 at LIGO

    Pedro Bicudo🇵🇹

    While quantum gravity is not solved yet, a screening mass for the graviton remains theoretically possible. If such a mass would screen gravity at distances of the order of the cluster galaxy radius, it could account for the universe expansion. The modified Newtonian dynamics model also could be related to a screening graviton mass at inter-galactic scales. Moreover, massive spin-2 theories constitute a very active theoretical topic. We briefly show how the very recent LIGO gravitational wave observation GW150914, emitted by a binary black hole merger distant $\sim 1.3\times 10^9$ ly from the Earth, tightens the phenomenological bound on a massive graviton or on the screening of gravity.

    ↳ gr-qchep-ph8 citations
22. 22*

    Mass hierarchy sensitivity of medium baseline reactor neutrino experiments with multiple detectors

    Hongxin Wang🇨🇳 · Liang Zhan🇨🇳 · Yu-Feng Li🇨🇳 · Guofu Cao🇨🇳 · Shenjian Chen🇨🇳

    We report the neutrino mass hierarchy (MH) sensitivity of medium baseline reactor neutrino experiments with multiple detectors. Sensitivity of determining the MH can be significantly improved by adding a near detector and combining both the near and far detectors. The size of the sensitivity improvement is related to accuracy of the individual mass-splitting measurements and requires strict control on the relative energy scale uncertainty of the near and far detectors. We study the impact of both baseline and target mass of the near detector on the combined sensitivity. A figure-of-merit is defined to optimize the baseline and target mass of the near detector and the optimal selections are $\sim$13~km and $\sim$4~kton respectively for a far detector with the 20~kton target mass and 52.5~km baseline. As typical examples of future medium baseline reactor neutrino experiments, the optimal location and target mass of the near detector are selected for JUNO and RENO-50. Finally, we discuss distinct effects of the neutrino spectrum uncertainty for setups of a single detector and double detectors, which indicate that the spectrum uncertainty can be well constrained in the presence of the near detector.

    ↳ physics.ins-dethep-exhep-phNPB(2017)·13 citations
23. 23*

    Combined analysis of the ${\pi }^{-}p\to K^0\Lambda$, $\eta n$ reactions in a chiral quark model

    Li-Ye Xiao · Fan Ouyang · Xian-Hui Zhong

    A combined analysis of the reactions ${\pi }^{-}p\to K^0\Lambda$ and $\eta n$ is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to $W\simeq 1.8$ GeV are reasonably described. For ${\pi }^{-}p\to K^0\Lambda$, it is found that $N(1535)S_{11}$ and $N(1650)S_{11}$ paly crucial roles near threshold. The $N(1650)S_{11}$ resonance contributes to the reaction through configuration mixing with $N(1535)S_{11}$. The constructive interference between $N(1535)S_{11}$ and $N(1650)S_{11}$ is responsible for the peak structure around threshold in the total cross section. The $n$-pole, $u$- and $t$-channel backgrounds provide significant contributions to the reaction as well. While, for the ${\pi }^{-}p\to \eta n$ process, the "first peak" in the total cross section is dominant by $N(1535)S_{11}$, which has a sizeable destructive interference with $N(1650)S_{11}$. Around $P_{\pi }\simeq$ 1.0 GeV/c ($W\simeq 1.7$ GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the $u$-channel and $N(1650)S_{11}$. The $N(1520)D_{13}$ resonance notably affects the angle distributions of the cross sections, although less effects are seen in the total cross section. The role of $P$-wave state $N(1720)P_{13}$ should be further confirmed by future experiments. If $N(1720)P_{13}$ has a narrow width of $\Gamma \simeq 120$ MeV as found in our previous work by a study of the ${\pi }^0$ photoproduction processes, obvious evidence should be seen in the ${\pi }^{-}p\to K^0\Lambda$ and $\eta n$ processes as well.

    ↳ nucl-thhep-phnucl-exPRC(2016)·8 citations
24. 24*

    Avoiding unrealistic priors: the case of dark energy constraints from the time variation of the fine-structure constant

    P. P. Avelino🇵🇹

    We critically assess recent claims suggesting that upper limits on the time variation of the fine-structure constant tightly constrain the coupling of a dark energy scalar field to the electromagnetic sector, and, indirectly, the violation of the weak equivalence principle. We show that such constraints depend crucially on the assumed priors, even if the dark energy was described by a dynamical scalar field with a constant equation of state parameter $w$ linearly coupled to the electromagnetic sector through a dimensionless coupling $\zeta$. We find that, although local atomic clock tests, as well as other terrestrial, astrophysical and cosmological data, put stringent bounds on $|\zeta |\sqrt{|w+1|}$, the time variation of the fine-structure constant cannot be used to set or to improve upper limits on $|\zeta |$ or $|w+1|$ without specifying priors, consistent but not favoured by current data, which strongly disfavour low values of $|w+1|$ or $|\zeta |$, respectively. We briefly discuss how this might change with a new generation of high-resolution ultra-stable spectrographs, such as ESPRESSO and ELT-HIRES, in combination with forthcoming missions to map the geometry of the Universe, such as Euclid, or to test the equivalence principle, such as MICROSCOPE or STEP.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2016)·0 citations
25. 25*

    Two-Field Born-Infeld with Diverse Dualities

    S. Ferrara🇨🇭 · A. Sagnotti🇮🇹 · A. Yeranyan🇮🇹

    We elaborate on how to build, in a systematic fashion, two-field Abelian extensions of the Born-Infeld Lagrangian. These models realize the non-trivial duality groups that are allowed in this case, namely U(2), SU(2) and U(1)xU(1). For each class, we also construct an explicit example. They all involve an overall square root and reduce to the Born-Infeld model if the two fields are identified, but differ in quartic and higher interactions. The U(1)xU(1) and SU(2) examples recover some recent results obtained with different techniques, and we show that the U(1)xU(1) model admits an N=1 supersymmetric completion. The U(2) example includes some unusual terms that are not analytic at the origin of field space.

    ↳ hep-thhep-phmath-phmath.MPNPB(2016)·9 citations
26. 26*

    Traversable holographic dark energy wormholes constrained by astronomical observations

    Deng Wang🇨🇳 · Xin-he Meng🇨🇳

    In this letter, we investigate the traversable wormholes in the holographic dark energy (HDE) model constrained by the modern astronomical observations. First of all, we constrain the HDE model by adopting different data-sets, explore the cosmological background evolution of the HDE model, and find that the HDE model will be fitting better than the Ricci dark energy (RDE) model for the same SNe Ia data-sets by using the the so-called Akaike Information Criterions (AIC) and Bayesian Information Criterions (BIC) . Furthermore, we discover that if taking the SNe Ia data-sets, the wormholes will appear (open) when the redshift $z<0.027$. Subsequently, several specific traversable wormhole solutions are obtained, including the constant redshift function, traceless stress energy tensor, a special choice for the shape function as well as the case of isotropic pressure. Except for the first case, it is very necessary to theoretically construct the traversable wormholes by matching the exterior geometries to the interior geometries. Naturally, one can easily find that the dimensions of the wormholes for the left cases are substantially finite.

    ↳ gr-qcastro-ph.COastro-ph.HEhep-phEPJC(2016)·26 citations
27. 27*

    Electromagnetic Counterparts to Black Hole Mergers Detected by LIGO

    Abraham Loeb (Harvard)🇺🇸

    Mergers of stellar-mass black holes (BHs), such as GW150914 observed by LIGO, are not expected to have electromagnetic counterparts. However, the Fermi GBM detector identified of a gamma-ray transient 0.4 s after the gravitational wave (GW) signal GW150914 with consistent sky localization. I show that the two signals might be related if the BH binary detected by LIGO originated from two clumps in a dumbbell configuration that formed when the core of a rapidly rotating massive star collapsed. In that case, the BH binary merger was followed by a gamma-ray burst (GRB) from a jet that originated in the accretion flow around the remnant BH. A future detection of a GRB afterglow could be used to determine the redshift and precise localization of the source. A population of standard GW sirens with GRB redshifts would provide a new approach for precise measurements of cosmological distances as a function of redshift.

    ↳ astro-ph.HEastro-ph.COastro-ph.SRgr-qc+1ApJL(2016)·246 citations
28. 28*

    Applied Antineutrino Physics 2015 -- Conference Summary

    N. S. Bowden🇺🇸 · K. M. Heeger🇺🇸 · P. Huber🇺🇸 · C. Mariani🇺🇸 · R. B. Vogelaar🇺🇸

    This is a brief summary of the 11th Applied Antineutrino Physics 2015 workshop held at the Virginia Tech Arlington Research Facility from December 7-8, 2015.

    ↳ hep-exhep-phnucl-exphysics.ins-det8 citations
29. 29*

    Back reaction effects on the dynamics of heavy probes in heavy quark cloud

    Shankhadeep Chakrabortty🇳🇱 · Tanay K. Dey🇮🇳

    We holographically study the effect of back reaction on the hydrodynamical properties of $\mathcal{N}=4$ strongly coupled super Yang-Mills (SYM) thermal plasma. The back reaction we consider arises from the presence of static heavy quarks uniformly distributed over $\mathcal{N}=4$ SYM plasma. In order to study the hydrodynamical properties, we use heavy quark as well as heavy quark-antiquark bound state as probes and compute the jet quenching parameter, screening length and binding energy. We also consider the rotational dynamics of heavy probe quark in the back-reacted plasma and analyse associated energy loss. We observe that the presence of back reaction enhances the energy-loss in the thermal plasma. Finally, we show that there is no effect of angular drag on the rotational motion of quark-antiquark bound state probing the back reacted thermal plasma.

    ↳ hep-thhep-phJHEP(2016)·26 citations
30. 30*

    Comments on Graviton Propagation in Light of GW150914

    John Ellis🇬🇧 · Nick E. Mavromatos🇬🇧 · Dimitri V. Nanopoulos🇺🇸

    The observation of gravitational waves from the Laser Interferometer Gravitational-Wave Observatory (LIGO) event GW150914 may be used to constrain the possibility of Lorentz violation in graviton propagation, and the observation by the Fermi Gamma-Ray Burst Monitor of a transient source in apparent coincidence may be used to constrain the difference between the velocities of light and gravitational waves: $c_g-c_{\gamma }<10^{-17}$.

    ↳ gr-qcastro-ph.COastro-ph.HEhep-ph+1Mod.Phys.Lett.A(2016)·62 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.