Searching for leptoquarks at IceCube and the LHC

Dey, Ujjal Kumar; Kar, D.; Mitra, Manimala; Spannowsky, Michael; Vincent, Aaron C.

doi:10.1103/physrevd.98.035014

Cited by 56 publications

(29 citation statements)

References 84 publications

(81 reference statements)

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“…Among the 106 strong XRG candidates (taken here as bona-fide XRGs), 7 sources have no optical object in the SDSS at the location of the host galaxy expected from the symmetry consideration of the radio lobes. For another 11 XRGs not covered in SDSS, we have used the r-band images from the DECam Legacy Survey [DE-CaLS] (Dey et al 2018). Three XRGs are covered neither in SDSS nor in DeCaLS.…”

Section: Optical Versus Radio Structural Alignmentmentioning

confidence: 99%

X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure

Joshi

Krishna

Yang

et al. 2019

ApJ

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In order to find clues to the origin of the "winged" or X-shaped radio galaxies (XRGs) we investigate here the parent galaxies of a large sample of 106 XRGs for optical-radio axes alignment, interstellar medium, black hole mass, and large-scale environment. For 41 of the XRGs it was possible to determine the optical major axis and the primary radio axis and the strong tendency for the two axes to be fairly close is confirmed. However, several counter-examples were also found and these could challenge the widely discussed backflow diversion model for the origin of the radio wings. Comparison with a welldefined large sample of normal FR II radio galaxies has revealed that: (i) XRGs possess slightly less massive central black holes than the normal radio galaxies (average masses being logM BH ∼ 8.81 M ⊙ and 9.07 M ⊙ , respectively); (ii) a much higher fraction of XRGs (∼ 80%) exhibits red mid-IR colors (W 2 − W 3 > 1.5), indicating a population of young stars and/or an enhanced dust mass, probably due to relatively recent galaxy merger(s). A comparison of the large-scale environment (i.e., within ∼ 1 Mpc) shows that both XRGs and FRII radio galaxies inhabit similarly poor galaxy clustering environments (medium richness being 8.94 and 11.87, respectively). Overall, the origin of XRGs seems difficult to reconcile with a single dominant physical mechanism and competing mechanisms seem prevalent.

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Section: Optical Versus Radio Structural Alignmentmentioning

confidence: 99%

X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure

Joshi

Krishna

Yang

et al. 2019

ApJ

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“…Conditions of the existence of graviatoms [76] constrain the masses of captured particles by m > 10 9 GeV for E int = E GUT . This can be (i) heavy particles captured at the reheating stage after the first inflation and (ii) leptoquarks survived in galactic haloes [77,78].…”

Section: Summary and Discussionmentioning

confidence: 99%

Generic Features of Thermodynamics of Horizons in Regular Spherical Space-Times of the Kerr-Schild Class

Dymnikova

2018

Universe

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Abstract:We present a systematic review of thermodynamics of horizons in regular spherically symmetric spacetimes of the Kerr-Schild class, ds 2 = g(r)dt 2 − g −1 (r)dr 2 − r 2 dΩ 2 , both asymptotically flat and with a positive background cosmological constant λ. Regular solutions of this class have obligatory de Sitter center. A source term in the Einstein equations satisfies T t t = T r r and represents an anisotropic vacuum dark fluid (p r = −ρ), defined by the algebraic structure of its stress-energy tensor, which describes a time-evolving and spatially inhomogeneous, distributed or clustering, vacuum dark energy intrinsically related to space-time symmetry. In the case of two vacuum scales it connects smoothly two de Sitter vacua, 8πGTIn the range of the mass parameter M cr1 ≤ M ≤ M cr2 it describes a regular cosmological black hole directly related to a vacuum dark energy. Space-time has at most three horizons: a cosmological horizon r c , a black hole horizon r b < r c , and an internal horizon r a < r b , which is the cosmological horizon for an observer in the internal R-region asymptotically de Sitter as r → 0. Asymptotically flat regular black holes (λ = 0) can have at most two horizons, r b and r a . We present the basic generic features of thermodynamics of horizons revealed with using the Padmanabhan approach relevant for a multi-horizon space-time with a non-zero pressure. Quantum evaporation of a regular black hole involves a phase transition in which the specific heat capacity is broken and changes sign while a temperature achieves its maximal value, and leaves behind the thermodynamically stable double-horizon (r a = r b ) remnant with zero temperature and positive specific heat. The mass of objects with the de Sitter center is generically related to vacuum dark energy and to breaking of space-time symmetry. In the cosmological context space-time symmetry provides a mechanism for relaxing cosmological constant to a certain non-zero value. We discuss also observational applications of the presented results.

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“…Even without SUSY, similar resonance features in neutrino-nucleon interactions can also occur in models with TeV-scale leptoquarks[95][96][97][98][99][100][101][102][103]. However, there are subtle differences between scalar leptoquark and RPV SUSY models, e.g.…”

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confidence: 90%

Signatures of Supersymmetry in Neutrino Telescopes

Dev¹

2020

Probing Particle Physics With Neutrino Telescopes

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We review the prospects of probing R-parity violating Supersymmetry (RPV SUSY) at neutrino telescopes using some of the highest energy particles given to us by Nature. The presence of RPV interactions involving ultra-high energy neutrinos with Earth-matter can lead to resonant production of TeV-scale SUSY partners of the SM quarks and leptons (squarks and sleptons), thereby giving rise to potentially anomalous behavior in the event spectrum observed by largevolume neutrino detectors, such as IceCube, as well as balloon-borne cosmic ray experiments, such as ANITA. Using the ultra-high energy neutrino events observed recently at IceCube, with the fact that for a given power-law flux of astrophysical neutrinos, there is no statistically significant deviation in the current data from the Standard Model expectations, we derive robust upper limits on the RPV couplings as a function of the resonantly-produced squark mass, independent of the other unknown model parameters, as long as the squarks decay dominantly to two-body final states involving leptons and quarks through the RPV couplings. Also, we discuss RPV SUSY interpretations of the recent anomalous, upward-going EeV air showers observed at ANITA, in terms of long-lived charged or neutral next-to-lightest SUSY particles.

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Searching for leptoquarks at IceCube and the LHC

Cited by 56 publications

References 84 publications

X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure

X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure

Generic Features of Thermodynamics of Horizons in Regular Spherical Space-Times of the Kerr-Schild Class

Signatures of Supersymmetry in Neutrino Telescopes

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