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 Gravitational effects (5)
 Gravity waves (5)
 Relativity (3)
 Polarization (3)
 General Relativity (3)

 Gravitation (2)
 Intelligent systems (2)
 Molecules (2)
 Topological Insulators (2)
 Density fluctuation (2)
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 Astrophysics (1)
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Articles 1  24 of 24
FullText Articles in Physical Sciences and Mathematics
Author Correction: Femtosecond Laser Mass Spectrometry And High Harmonic Spectroscopy Of Xylene Isomers (Scientific Reports (2018) Doi: 10.1038/S41598018220559), Abdullah Alharbi, Andrewy E. Boguslavskiy, Dane Austin, Nicolas Thire, D. Wood, P. Hawkins, Felicity Mcgrath, A. S. Johnson, I. LopezQuintas, Bruno Schmidt, Francois Legare, J. P. Marangos, AnhThu Le, Ravi Bhardwaj
Author Correction: Femtosecond Laser Mass Spectrometry And High Harmonic Spectroscopy Of Xylene Isomers (Scientific Reports (2018) Doi: 10.1038/S41598018220559), Abdullah Alharbi, Andrewy E. Boguslavskiy, Dane Austin, Nicolas Thire, D. Wood, P. Hawkins, Felicity Mcgrath, A. S. Johnson, I. LopezQuintas, Bruno Schmidt, Francois Legare, J. P. Marangos, AnhThu Le, Ravi Bhardwaj
Physics Faculty Research & Creative Works
The original version of this Article contained a typographical error in the spelling of the author Nicolas Thiré, which was incorrectly given as Nicholas Thiré. Nicolas Thiré was also incorrectly affiliated with 'Instituto de Química Física Rocasolano, IQFRCSIC, Serrano 119, 28006, Madrid, Spain'. The correct affiliation is listed below.
INRSEMT, Advanced Laser Light Source, 1650 LionelBoulet Bvd, Varennes, J3X1S2, Canada.
This has now been corrected in the PDF and HTML versions of the Article and in the accompanying Supplementary Information file.
Prospects For Observing And Localizing GravitationalWave Transients With Advanced Ligo, Advanced Virgo And Kagra, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Prospects For Observing And Localizing GravitationalWave Transients With Advanced Ligo, Advanced Virgo And Kagra, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present possible observing scenarios for the Advanced LIGO, Advanced Virgo and KAGRA gravitationalwave detectors over the next decade, with the intention of providing information to the astronomy community to facilitate planning for multimessenger astronomy with gravitational waves. We estimate the sensitivity of the network to transient gravitationalwave signals, and study the capability of the network to determine the sky location of the source. We report our findings for gravitationalwave transients, with particular focus on gravitationalwave signals from the inspiral of binary neutron star systems, which are the most promising targets for multimessenger astronomy. The ability to localize the sources ...
Search For SubsolarMass Ultracompact Binaries In Advanced Ligo's First Observing Run, B. P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For SubsolarMass Ultracompact Binaries In Advanced Ligo's First Observing Run, B. P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the first Advanced LIGO and Advanced Virgo search for ultracompact binary systems with component masses between 0.2 M_{⊙}1.0 M_{⊙} using data taken between September 12, 2015 and January 19, 2016. We find no viable gravitational wave candidates. Our null result constrains the coalescence rate of monochromatic (delta function) distributions of nonspinning (0.2 M_{⊙}, 0.2 M_{⊙}) ultracompact binaries to be less than 1.0 x 10^{6} Gpc^{3} yr^{1} and the coalescence rate of a similar distribution of (1.0 M_{⊙}, 1.0 M_{⊙}) ultracompact binaries to be less than 1.9 ...
Gw170817: Measurements Of Neutron Star Radii And Equation Of State, B. P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Gw170817: Measurements Of Neutron Star Radii And Equation Of State, B. P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitationalwave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the extreme conditions found in the interior of these stars. The initial, minimalassumption analysis of the LIGO and Virgo data placed constraints on the tidal effects of the coalescing bodies, which were then translated to constraints on neutron star radii. Here, we expand upon previous analyses by working under the hypothesis that both bodies were ...
RealTime Observation Of Molecular Spinning With Angular HighHarmonic Spectroscopy, Lixin He, Pengfei Lan, AnhThu Le, Baoning Wang, Bincheng Wang, Xiaosong Zhu, Peixiang Lu, C. D. Lin
RealTime Observation Of Molecular Spinning With Angular HighHarmonic Spectroscopy, Lixin He, Pengfei Lan, AnhThu Le, Baoning Wang, Bincheng Wang, Xiaosong Zhu, Peixiang Lu, C. D. Lin
Physics Faculty Research & Creative Works
We demonstrate an angular highharmonic spectroscopy method to probe the spinning dynamics of a molecular rotation wave packet in real time. With the excitation of two timedelayed, polarizationskewed pump pulses, the molecular ensemble is impulsively kicked to rotate unidirectionally, which is subsequently irradiated by another delayed probe pulse for highorder harmonic generation (HHG). The spatiotemporal evolution of the molecular rotation wave packet is visualized from the timedependent angular distributions of the HHG yields and frequency shift measured at various polarization directions and time delays of the probe pulse. The observed frequency shift in HHG is demonstrated to arise from the ...
Electronic Fingerprints Of Cr And V Dopants In The Topological Insulator Sb₂Te₃, Wenhan Zhang, Damien West, Seng Huat Lee, Yunsheng Qiu, CuiZu Chang, Jagadeesh S. Moodera, Yew San Hor, Shengbai Zhang, Weida Wu
Electronic Fingerprints Of Cr And V Dopants In The Topological Insulator Sb₂Te₃, Wenhan Zhang, Damien West, Seng Huat Lee, Yunsheng Qiu, CuiZu Chang, Jagadeesh S. Moodera, Yew San Hor, Shengbai Zhang, Weida Wu
Physics Faculty Research & Creative Works
By combining scanning tunneling microscopy/spectroscopy and firstprinciples calculations, we systematically study the local electronic states of magnetic dopants V and Cr in the topological insulator (TI) Sb_{2}Te_{3}. Spectroscopic imaging shows diverse local defect states between Cr and V, which agree with our firstprinciple calculations. The unique spectroscopic features of V and Cr dopants provide electronic fingerprints for the codoped magnetic TI samples with the enhanced quantum anomalous Hall effect. Our results also facilitate the exploration of the underlying mechanism of the enhanced quantum anomalous Hall temperature in Cr/V codoped TIs.
Gravitational Effects In G Factor Measurements And HighPrecision Spectroscopy: Limits Of Einstein's Equivalence Principle, Ulrich D. Jentschura
Gravitational Effects In G Factor Measurements And HighPrecision Spectroscopy: Limits Of Einstein's Equivalence Principle, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
We study the interplay of general relativity, the equivalence principle, and highprecision experiments involving atomic transitions and gfactor measurements. In particular, we derive a generalized Dirac Hamiltonian, which describes both the gravitational coupling for weak fields and the electromagnetic coupling, e.g., to a central Coulomb field. An approximate form of this Hamiltonian is used to derive the leading gravitational corrections to transition frequencies and g factors. The position dependence of atomic transitions is shown to be compatible with the equivalence principle, up to a very good approximation. The compatibility of gfactor measurements requires a deeper subtle analysis in order ...
The Role Of Multiple Electron Processes For Fast Ion H₂O Collisions, N. Bachi, G. S. Otero, S. Otranto, Ronald E. Olson
The Role Of Multiple Electron Processes For Fast Ion H₂O Collisions, N. Bachi, G. S. Otero, S. Otranto, Ronald E. Olson
Physics Faculty Research & Creative Works
In this work, collision processes between C^{6+}, O^{8+} and Si^{13+} ions and H_{2}O molecules that lead to target ionization are studied by means of the classical trajectory Monte Carlo method. We employ an 8electron model in which the H_{2}O electron densities and energies dynamically adapt during ionization processes to those corresponding to the H_{2}O^{q+} ions by assuming vertical transitions between the different molecular ionic states. Net total ionization cross sections and single differential cross sections in energy and angle are shown for 4 MeV/u projectiles and compared to available ...
Extinction Transitions In Correlated External Noise, Alexander H. O. Wada, Matthew Small, Thomas Vojta
Extinction Transitions In Correlated External Noise, Alexander H. O. Wada, Matthew Small, Thomas Vojta
Physics Faculty Research & Creative Works
We analyze the influence of longrange correlated (colored) external noise on extinction phase transitions in growth and spreading processes. Uncorrelated environmental noise (i.e., temporal disorder) was recently shown to give rise to an unusual infinitenoise critical point [Europhys. Lett. 112, 30002 (2015)EULEEJ0295507510.1209/02955075/112/30002]. It is characterized by enormous density fluctuations that increase without limit at criticality. As a result, a typical population decays much faster than the ensemble average, which is dominated by rare events. Using the logistic evolution equation as an example, we show here that positively correlated (red) environmental noise further enhances these ...
Scanning Tunneling Spectroscopy Investigations Of SuperconductingDoped Topological Insulators: Experimental Pitfalls And Results, Stefan Wilfert, Paolo Sessi, Zhiwei Wang, Henrik Schmidt, M. Carmen MartínezVelarte, Seng Huat Lee, Yew San Hor, Alexander F. Otte, Yoichi Ando, Weida Wu, Matthias Bode
Scanning Tunneling Spectroscopy Investigations Of SuperconductingDoped Topological Insulators: Experimental Pitfalls And Results, Stefan Wilfert, Paolo Sessi, Zhiwei Wang, Henrik Schmidt, M. Carmen MartínezVelarte, Seng Huat Lee, Yew San Hor, Alexander F. Otte, Yoichi Ando, Weida Wu, Matthias Bode
Physics Faculty Research & Creative Works
Recently, the doping of topological insulators has attracted significant interest as a potential route towards topological superconductivity. Because many experimental techniques lack sufficient surface sensitivity, however, definite proof of the coexistence of topological surface states and surface superconductivity is still outstanding. Here we report on highly surface sensitive scanning tunneling microscopy and spectroscopy experiments performed on Tldoped Bi_{2}Te_{3}, a threedimensional topological insulator which becomes superconducting in the bulk at T_{C}=2.3 K. Landau level spectroscopy as well as quasiparticle interference mapping clearly demonstrated the presence of a topological surface state with a Dirac point energy ...
Quantum Critical Behavior Of A ThreeDimensional SuperfluidMott Glass Transition, Jack Crewse, Cameron Lerch, Thomas Vojta
Quantum Critical Behavior Of A ThreeDimensional SuperfluidMott Glass Transition, Jack Crewse, Cameron Lerch, Thomas Vojta
Physics Faculty Research & Creative Works
The superfluid to insulator quantum phase transition of a threedimensional particlehole symmetric system of disordered bosons is studied. To this end, a sitediluted quantum rotor Hamiltonian is mapped onto a classical (3+1)dimensional XY model with columnar disorder and analyzed by means of largescale Monte Carlo simulations. The superfluidMott insulator transition of the clean, undiluted system is in the fourdimensional XY universality class and shows meanfield critical behavior with logarithmic corrections. The clean correlation length exponent ν=1/2 violates the Harris criterion, indicating that disorder must be a relevant perturbation. For nonzero dilutions below the lattice percolation threshold ...
Tuning A RandomField Mechanism In A Frustrated Magnet, Shashikant Singh Kunwar, Arnab Sen, Thomas Vojta, Rajesh Narayanan
Tuning A RandomField Mechanism In A Frustrated Magnet, Shashikant Singh Kunwar, Arnab Sen, Thomas Vojta, Rajesh Narayanan
Physics Faculty Research & Creative Works
We study the influence of spinless impurities on a frustrated magnet featuring a spindensity wave (stripe) phase by means of Monte Carlo simulations. We demonstrate that the interplay between the impurities and an order parameter that breaks a realspace symmetry triggers the emergence of a randomfield mechanism which destroys the stripeordered phase. Importantly, the strength of the emerging random fields can be tuned by the repulsion between the impurity atoms; they vanish for perfect anticorrelations between neighboring impurities. This provides a way of controlling the phase diagram of a manyparticle system. In addition, we also investigate the effects of the ...
Relativistic And Radiative Corrections To The Dynamic Stark Shift: Gauge Invariance And Transition Currents In The Velocity Gauge, Ulrich D. Jentschura, Chandra M. Adhikari
Relativistic And Radiative Corrections To The Dynamic Stark Shift: Gauge Invariance And Transition Currents In The Velocity Gauge, Ulrich D. Jentschura, Chandra M. Adhikari
Physics Faculty Research & Creative Works
We investigate the gauge invariance of the dynamic (ac) Stark shift under "hybrid" gauge transformations from the "length" (E·r ) to the "velocity" (A·p ) gauge. By a "hybrid" gauge transformation, we understand a transformation in which the scalar and vector potentials are modified, but the wave function remains unaltered. The gauge invariance of the leading term is well known, while we here show that gauge invariance under perturbations holds only if one takes into account an additional correction to the transition current, which persists only in the velocity gauge. We find a general expression for this current, and apply ...
Dynamic Effects In Electron Momentum Spectroscopy Of Sulfur Hexafluoride, Xing Wang, Shenyue Xu, Chuangang Ning, O. AlHagan, Pengfei Hu, Yongtao Zhao, Zhongfen Xu, Jingkang Deng, Enliang Wang, Xueguang Ren, Alexander Dorn, Don H. Madison
Dynamic Effects In Electron Momentum Spectroscopy Of Sulfur Hexafluoride, Xing Wang, Shenyue Xu, Chuangang Ning, O. AlHagan, Pengfei Hu, Yongtao Zhao, Zhongfen Xu, Jingkang Deng, Enliang Wang, Xueguang Ren, Alexander Dorn, Don H. Madison
Physics Faculty Research & Creative Works
Electron momentum spectroscopy (EMS) results are presented for the sulfur hexafluoride (SF6) molecule using a highresolution binary (e, 2e) spectrometer at incident energies (Ei) of 600, 1200, and 2400 eV plus the binding energy. The valence orbital momentum profiles were measured with a binding energy resolution of 0.68 eV and angular resolutions of Δθ = ±0.6⁰, ΔΦ = ±0.85⁰. Whereas the two higher incident energies are in the range where normally EMS measurements do not exhibit an impactenergy dependence, the current experimental data display a dynamic dependence on the impact energies. The measured momentum profiles are compared with predictions ...
Search For Tensor, Vector, And Scalar Polarizations In The Stochastic GravitationalWave Background, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Tensor, Vector, And Scalar Polarizations In The Stochastic GravitationalWave Background, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The detection of gravitational waves with Advanced LIGO and Advanced Virgo has enabled novel tests of general relativity, including direct study of the polarization of gravitational waves. While general relativity allows for only two tensor gravitationalwave polarizations, general metric theories can additionally predict two vector and two scalar polarizations. The polarization of gravitational waves is encoded in the spectral shape of the stochastic gravitationalwave background, formed by the superposition of cosmological and individually unresolved astrophysical sources. Using data recorded by Advanced LIGO during its first observing run, we search for a stochastic background of generically polarized gravitational waves. We find ...
Constraints On Cosmic Strings Using Data From The First Advanced Ligo Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Constraints On Cosmic Strings Using Data From The First Advanced Ligo Observing Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Cosmic strings are topological defects which can be formed in grand unified theory scale phase transitions in the early universe. They are also predicted to form in the context of string theory. The main mechanism for a network of NambuGoto cosmic strings to lose energy is through the production of loops and the subsequent emission of gravitational waves, thus offering an experimental signature for the existence of cosmic strings. Here we report on the analysis conducted to specifically search for gravitationalwave bursts from cosmic string loops in the data of Advanced LIGO 20152016 observing run (O1). No evidence of such ...
Full Band AllSky Search For Periodic Gravitational Waves In The O1 Ligo Data, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Full Band AllSky Search For Periodic Gravitational Waves In The O1 Ligo Data, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We report on a new allsky search for periodic gravitational waves in the frequency band 4752000 Hz and with a frequency time derivative in the range of [1.0,+0.1] x 10^{8} Hz/s. Potential signals could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the data from Advanced LIGO's first observational run O1. No gravitationalwave signals were observed, and upper limits were placed on their strengths. For completeness, results from the separately published lowfrequency search 20475 Hz are included as well. Our lowest upper limit on ...
Following Coherent Multichannel Nuclear Wave Packets In PumpProbe Studies Of O₂ With Ultrashort Laser Pulses, S. Xue, H. Du, B. Hu, C. D. Lin, AnhThu Le
Following Coherent Multichannel Nuclear Wave Packets In PumpProbe Studies Of O₂ With Ultrashort Laser Pulses, S. Xue, H. Du, B. Hu, C. D. Lin, AnhThu Le
Physics Faculty Research & Creative Works
We reexamine the recent pumpprobe experiment with O₂ using short intense infrared laser pulses theoretically. Using parameters that closely mimic the experimental conditions and taking into account the angledependent population redistribution due to resonant coupling between the relevant states, we show that the observed kinetic energy release spectra, including the energydependent structure and the quantum beat frequencies, can be accurately reproduced. Our results reveal additional important channels that were missed earlier. In particular, the strong contributions from O₂+a^{4}Π_{u} and b^{4}Σ_{b} states lead to the possibility of observing the interchannel beating. We further demonstrate ...
AllOptical Atom Trap As A Target For MotrimsLike Collision Experiments, S. Sharma, B. P. Acharya, Daniel Fischer, For Full List Of Authors, See Publisher's Website.
AllOptical Atom Trap As A Target For MotrimsLike Collision Experiments, S. Sharma, B. P. Acharya, Daniel Fischer, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Momentumresolved scattering experiments with lasercooled atomic targets have been performed since almost two decades with magnetooptical trap recoil ion momentum spectroscopy (MOTRIMS) setups. Compared to experiments with gasjet targets, MOTRIMS features significantly lower target temperatures allowing for an excellent recoil ion momentum resolution. However, the coincident and momentumresolved detection of electrons was long rendered impossible due to incompatible magnetic field requirements. Here we report on an experimental approach which is based on an alloptical ^{6}Liatom trap thatin contrast to magnetooptical trapsdoes not require magnetic field gradients in the trapping region. Atom temperatures of about 2 mK and number densities ...
Atomic Physics Constraints On The X Boson, Ulrich D. Jentschura, Istvan Nandori
Atomic Physics Constraints On The X Boson, Ulrich D. Jentschura, Istvan Nandori
Physics Faculty Research & Creative Works
Recently, a peak in the light fermion pair spectrum at invariant q)^{2} ≈ (16.7MeV)^{2} has been observed in the bombardment of ^{7}Li by protons. This peak has been interpreted in terms of a protophobic interaction of fermions with a gauge boson (X boson) of invariant mass ≈16.7MeV which couples mainly to neutrons. Highprecision atomic physics experiments aimed at observing the protophobic interaction need to separate the X boson effect from the nuclearsize effect, which is a problem because of the short range of the interaction (11.8 fm), which is commensurate with a "nuclear halo." Here ...
Femtosecond Laser Mass Spectrometry And High Harmonic Spectroscopy Of Xylene Isomers, Abdullah Alharbi, Andrewy E. Boguslavskiy, Dane Austin, Nicolas Thire, D. Wood, P. Hawkins, Felicity Mcgrath, A. S. Johnson, I. LopezQuintas, Bruno Schmidt, Francois Legare, J. P. Marangos, AnhThu Le, Ravi Bhardwaj
Femtosecond Laser Mass Spectrometry And High Harmonic Spectroscopy Of Xylene Isomers, Abdullah Alharbi, Andrewy E. Boguslavskiy, Dane Austin, Nicolas Thire, D. Wood, P. Hawkins, Felicity Mcgrath, A. S. Johnson, I. LopezQuintas, Bruno Schmidt, Francois Legare, J. P. Marangos, AnhThu Le, Ravi Bhardwaj
Physics Faculty Research & Creative Works
Structural isomers, molecules having the same chemical formula but with atoms bonded in different order, are hard to identify using conventional spectroscopy and mass spectrometry. They exhibit virtually indistinguishable mass spectra when ionized by electrons. Laser mass spectrometry based on photoionization of the isomers has emerged as a promising alternative but requires shaped ultrafast laser pulses. Here we use transform limited femtosecond pulses to distinguish the isomers using two methods. First, we probe doubly charged parent ions with circularly polarized light. We show that the yield of doubly charged orthoxylene decreases while paraxylene increases over a range of laser intensities ...
Gw170817: Implications For The Stochastic GravitationalWave Background From Compact Binary Coalescences, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Gw170817: Implications For The Stochastic GravitationalWave Background From Compact Binary Coalescences, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The LIGO Scientific and Virgo Collaborations have announced the event GW170817, the first detection of gravitational waves from the coalescence of two neutron stars. The merger rate of binary neutron stars estimated from this event suggests that distant, unresolvable binary neutron stars create a significant astrophysical stochastic gravitationalwave background. The binary neutron star component will add to the contribution from binary black holes, increasing the amplitude of the total astrophysical background relative to previous expectations. In the Advanced LIGOVirgo frequency band most sensitive to stochastic backgrounds (near 25 Hz), we predict a total astrophysical background with amplitude Ω_{GW}(f ...
Fractional Brownian Motion With A Reflecting Wall, Alexander H. O. Wada, Thomas Vojta
Fractional Brownian Motion With A Reflecting Wall, Alexander H. O. Wada, Thomas Vojta
Physics Faculty Research & Creative Works
Fractional Brownian motion, a stochastic process with longtime correlations between its increments, is a prototypical model for anomalous diffusion. We analyze fractional Brownian motion in the presence of a reflecting wall by means of Monte Carlo simulations. Whereas the meansquare displacement of the particle shows the expected anomalous diffusion behavior (x^{2}) ~ t^{α}, the interplay between the geometric confinement and the longtime memory leads to a highly nonGaussian probability density function with a powerlaw singularity at the barrier. In the superdiffusive case α > 1, the particles accumulate at the barrier leading to a divergence of the probability density. For ...
First Search For Nontensorial Gravitational Waves From Known Pulsars, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
First Search For Nontensorial Gravitational Waves From Known Pulsars, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present results from the first directed search for nontensorial gravitational waves. While general relativity allows for tensorial (plus and cross) modes only, a generic metric theory may, in principle, predict waves with up to six different polarizations. This analysis is sensitive to continuous signals of scalar, vector, or tensor polarizations, and does not rely on any specific theory of gravity. After searching data from the first observation run of the advanced LIGO detectors for signals at twice the rotational frequency of 200 known pulsars, we find no evidence of gravitational waves of any polarization. We report the first upper ...