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 Impact Ionization (5)
 Quantum Theory (5)
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 Largescale structure of universe (4)
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Articles 1  30 of 50
FullText Articles in Physical Sciences and Mathematics
First AllSky Search For Continuous Gravitational Waves From Unknown Sources In Binary Systems, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
First AllSky Search For Continuous Gravitational Waves From Unknown Sources In Binary Systems, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughout the history of the Universe that is unavailable through standard electromagnetic observations, making its study of fundamental importance to understanding the evolution of the Universe. We carry out a search for the stochastic background with the latest data from the LIGO and Virgo detectors. Consistent with predictions from most stochastic gravitationalwave background models, the data display no evidence of a stochastic gravitationalwave signal. Assuming a gravitationalwave spectrum of Ω_{GW}(f) = Ω_{α}(f ...
Improved Upper Limits On The Stochastic GravitationalWave Background From 20092010 Ligo And Virgo Data, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Improved Upper Limits On The Stochastic GravitationalWave Background From 20092010 Ligo And Virgo Data, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughout the history of the Universe that is unavailable through standard electromagnetic observations, making its study of fundamental importance to understanding the evolution of the Universe. We carry out a search for the stochastic background with the latest data from the LIGO and Virgo detectors. Consistent with predictions from most stochastic gravitationalwave background models, the data display no evidence of a stochastic gravitationalwave signal. Assuming a gravitationalwave spectrum of ΩGW(f)=Ωα±(f/fref)α ...
XRay Emission Produced In ChargeExchange Collisions Between Highly Charged Ions And Argon: Role Of The Multiple Electron Capture, Sebastian Otranto, N. D. Cariatore, Ronald E. Olson
XRay Emission Produced In ChargeExchange Collisions Between Highly Charged Ions And Argon: Role Of The Multiple Electron Capture, Sebastian Otranto, N. D. Cariatore, Ronald E. Olson
Physics Faculty Research & Creative Works
In this work we use the classical trajectory Monte Carlo method within an eightelectron scheme to theoretically study photonic spectra that follow chargeexchange processes between highly charged ions of charge states 10+, 17+, 18+, and 36+ with neutral argon. The energy range considered is 18 eV/amu to 4 keV/amu, covering typical electron beam ion traps and solar wind energies. The role played by multiple electron capture processes for the different collision systems under consideration is explicitly analyzed and its contribution separated as arising from radiative decay and autoionizing multiple capture. For the present collision systems we find that ...
Theoretical And Experimental (E, 2e) Study Of ElectronImpact Ionization Of LaserAligned Mg Atoms, Sadek Amami, Andrew J. Murray, Al Stauffer, Kate Nixon, Gregory Armstrong, James Colgan, Don H. Madison
Theoretical And Experimental (E, 2e) Study Of ElectronImpact Ionization Of LaserAligned Mg Atoms, Sadek Amami, Andrew J. Murray, Al Stauffer, Kate Nixon, Gregory Armstrong, James Colgan, Don H. Madison
Physics Faculty Research & Creative Works
We have performed calculations of the fully differential cross sections for electronimpact ionization of magnesium atoms. Three theoretical approximations, the timedependent close coupling, the threebody distorted wave, and the distorted wave Born approximation, are compared with experiment in this article. Results will be shown for ionization of the 3s ground state of Mg for both asymmetric and symmetric coplanar geometries. Results will also be shown for ionization of the 3p state which has been excited by a linearly polarized laser which produces a charge cloud aligned perpendicular to the laser beam direction and parallel to the linear polarization. Theoretical and ...
Understanding HigherOrder Nonlocal Halo Bias At Large Scales By Combining The Power Spectrum With The Bispectrum, Shun Saito, Tobias Baldauf, For Full List Of Authors, See Publisher's Website.
Understanding HigherOrder Nonlocal Halo Bias At Large Scales By Combining The Power Spectrum With The Bispectrum, Shun Saito, Tobias Baldauf, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Understanding the relation between underlying matter distribution and biased tracers such as galaxies or dark matter halos is essential to extract cosmological information from ongoing or future galaxy redshift surveys. At sufficiently large scales such as the baryon acoustic oscillation (BAO) scale, a standard approach for the bias problem on the basis of the perturbation theory (PT) is to assume the "local bias" model in which the density field of biased tracers is deterministically expanded in terms of matter density field at the same position. The higherorder bias parameters are then determined by combining the power spectrum with higherorder statistics ...
Route To Optimal Generation Of Soft XRay High Harmonics With Synthesized TwoColor Laser Pulses, Cheng Jin, Guoli Wang, AnhThu Le, C. D. Lin
Route To Optimal Generation Of Soft XRay High Harmonics With Synthesized TwoColor Laser Pulses, Cheng Jin, Guoli Wang, AnhThu Le, C. D. Lin
Physics Faculty Research & Creative Works
High harmonics extending to Xrays have been generated from gases by intense lasers. To establish these coherent broadband radiations as an allpurpose tabletop light source for general applications in science and technology, new methods are needed to overcome the present low conversion efficiencies. Here we show that the conversion efficiency may be drastically increased with an optimized twocolor pulse. By employing an optimally synthesized 2µm midinfrared laser and a small amount of its third harmonic, we show that harmonic yields from sub to fewkeV energy can be increased typically by tenfold over the optimized singlecolor one. By combining with favorable ...
Fully Differential Study Of Interference Effects In The Ionization Of H₂ By Proton Impact, Sachin D. Sharma, T. P. Arthanayaka, Ahmad Hasan, B. R. Lamichhane, J. Remolina, Adolph P. Smith, Michael Schulz
Fully Differential Study Of Interference Effects In The Ionization Of H₂ By Proton Impact, Sachin D. Sharma, T. P. Arthanayaka, Ahmad Hasan, B. R. Lamichhane, J. Remolina, Adolph P. Smith, Michael Schulz
Physics Faculty Research & Creative Works
We have measured fully differential cross sections for ionization of H_{2} by 75keV proton impact. The coherence length of the projectile beam was varied by changing the distance between a collimating slit and the target. By comparing the cross sections measured for large and small coherence lengths pronounced interference effects could be identified in the data. A surprising result is that the phase angle in the interference term is primarily determined by the momentum transfer and only to a lesser extent by the recoilion momentum.
Multimessenger Search For Sources Of Gravitational Waves And HighEnergy Neutrinos: Initial Results For LigoVirgo And Icecube, M. G. Aartsen, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Multimessenger Search For Sources Of Gravitational Waves And HighEnergy Neutrinos: Initial Results For LigoVirgo And Icecube, M. G. Aartsen, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We report the results of a multimessenger search for coincident signals from the LIGO and Virgo gravitationalwave observatories and the partially completed IceCube highenergy neutrino detector, including periods of joint operation between 20072010. These include parts of the 20052007 run and the 20092010 run for LIGOVirgo, and IceCube's observation periods with 22, 59 and 79 strings. We find no significant coincident events, and use the search results to derive upper limits on the rate of joint sources for a range of source emission parameters. For the optimistic assumption of gravitationalwave emission energy of 10^{2}M⊙c^{2} at ...
Light Localization Induced By A Random Imaginary Refractive Index, A. Basiri, Yaron Bromberg, Alexey Yamilov, Tsampikos Kottos
Light Localization Induced By A Random Imaginary Refractive Index, A. Basiri, Yaron Bromberg, Alexey Yamilov, Tsampikos Kottos
Physics Faculty Research & Creative Works
We show the emergence of light localization in arrays of coupled optical waveguides with randomness only in the imaginary part of their refractive index and develop a oneparameter scaling theory for the normalized participation number of FloquetBloch modes. This localization introduces a different length scale in the decay of the autocorrelation function of a paraxial beam propagation. Our results are relevant to a vast family of systems with randomness in the dissipative part of their impedance spatial profile.
Enhanced RareRegion Effects In The Contact Process With LongRange Correlated Disorder, Ahmed K. Ibrahim, Hatem Barghathi, Thomas Vojta
Enhanced RareRegion Effects In The Contact Process With LongRange Correlated Disorder, Ahmed K. Ibrahim, Hatem Barghathi, Thomas Vojta
Physics Faculty Research & Creative Works
We investigate the nonequilibrium phase transition in the disordered contact process in the presence of longrange spatial disorder correlations. These correlations greatly increase the probability for finding rare regions that are locally in the active phase while the bulk system is still in the inactive phase. Specifically, if the correlations decay as a power of the distance, the rareregion probability is a stretched exponential of the rareregion size rather than a simple exponential as is the case for uncorrelated disorder. As a result, the Griffiths singularities are enhanced and take a nonpowerlaw form. The critical point itself is of infiniterandomness ...
Phase Transitions On Random Lattices: How Random Is Topological Disorder?, Hatem Barghathi, Thomas Vojta
Phase Transitions On Random Lattices: How Random Is Topological Disorder?, Hatem Barghathi, Thomas Vojta
Physics Faculty Research & Creative Works
We study the effects of topological (connectivity) disorder on phase transitions. We identify a broad class of random lattices whose disorder fluctuations decay much faster with increasing length scale than those of generic random systems, yielding a wandering exponent of ω = (d−1)/(2d) in d dimensions. The stability of clean critical points is thus governed by the criterion (d+1)ν > 2 rather than the usual Harris criterion dν > 2, making topological disorder less relevant than generic randomness. The ImryMa criterion is also modified, allowing firstorder transitions to survive in all dimensions d > 1. These results explain a host ...
StrongDisorder Magnetic Quantum Phase Transitions: Status And New Developments, Thomas Vojta
StrongDisorder Magnetic Quantum Phase Transitions: Status And New Developments, Thomas Vojta
Physics Faculty Research & Creative Works
This article reviews the unconventional effects of random disorder on magnetic quantum phase transitions, focusing on a number of new experimental and theoretical developments during the last three years. On the theory side, we address smeared quantum phase transitions tuned by changing the chemical composition, for example in alloys of the type A_{1x}B_{x}. We also discuss how the interplay of order parameter conservation and overdamped dynamics leads to enhanced quantum Griffiths singularities in disordered metallic ferromagnets. Finally, we discuss a semiclassical theory of transport properties in quantum Griffiths phases. Experimental examples include the ruthenates Sr_{1x}Ca ...
FineStructure Constant For Gravitational And Scalar Interactions, Ulrich D. Jentschura
FineStructure Constant For Gravitational And Scalar Interactions, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
Starting from the coupling of a relativistic quantum particle to the curved Schwarzschild space time, we show that the DiracSchwarzschild problem has bound states and calculate their energies including relativistic corrections. Relativistic effects are shown to be suppressed by the gravitational finestructure constant α_{G}=Gm_{1}m_{2}/(ℏc), where G is Newton's gravitational constant, c is the speed of light, and m_{1} and m_{2} ≫ m_{1} are the masses of the two particles. The kinetic corrections due to spacetime curvature are shown to lift the familiar (n,j) degeneracy of the energy levels of the ...
Effect Of The CenterOfMass Approximation On The Scaling Of ElectronCapture Fully Differential Cross Sections, A. L. Harris, Don H. Madison
Effect Of The CenterOfMass Approximation On The Scaling Of ElectronCapture Fully Differential Cross Sections, A. L. Harris, Don H. Madison
Physics Faculty Research & Creative Works
We present results for p+He single electron capture and transfer with target excitation using the first Born approximation. The effect of approximating the center of mass of the helium atom and outgoing hydrogen atom at the respective nuclei is explored. Semianalytical results are compared for the calculations with and without the approximation, and it is shown that one must properly account for the center of mass of the atoms. It is also shown that this approximation is the result of the apparent v^{4} scaling that was previously observed with the fourbody transfer with target excitation model.
Dynamical (E,2e) Investigations Of Structurally Related Cyclic Ethers, J. D. BuilthWilliams, Luca Chiari, Penny A. Thorn, Susan M. Bellm, D. B. Jones, Hari Chaluvadi, Don H. Madison, Chuangang Ning, B. Lohmann, Oddur Ingólfsson, Michael J. Brunger
Dynamical (E,2e) Investigations Of Structurally Related Cyclic Ethers, J. D. BuilthWilliams, Luca Chiari, Penny A. Thorn, Susan M. Bellm, D. B. Jones, Hari Chaluvadi, Don H. Madison, Chuangang Ning, B. Lohmann, Oddur Ingólfsson, Michael J. Brunger
Physics Faculty Research & Creative Works
Experimental and theoretical cross sections are presented for electronimpact ionization of a series of cyclic ethers.
Rare Regions And Griffiths Singularities At A Clean Critical Point: The FiveDimensional Disordered Contact Process, Thomas Vojta, John Igo, José A. Hoyos
Rare Regions And Griffiths Singularities At A Clean Critical Point: The FiveDimensional Disordered Contact Process, Thomas Vojta, John Igo, José A. Hoyos
Physics Faculty Research & Creative Works
We investigate the nonequilibrium phase transition of the disordered contact process in five space dimensions by means of optimal fluctuation theory and Monte Carlo simulations. We find that the critical behavior is of meanfield type, i.e., identical to that of the clean fivedimensional contact process. It is accompanied by offcritical powerlaw Griffiths singularities whose dynamical exponent z' saturates at a finite value as the transition is approached. These findings resolve the apparent contradiction between the Harris criterion, which implies that weak disorder is renormalizationgroup irrelevant, and the rareregion classification, which predicts unconventional behavior. We confirm and illustrate our theory ...
Probing LongRange Intensity Correlations Inside Disordered Photonic Nanostructures, Raktim Sarma, Alexey Yamilov, Pauf Neupane, Boris Shapiro, Hui Cao
Probing LongRange Intensity Correlations Inside Disordered Photonic Nanostructures, Raktim Sarma, Alexey Yamilov, Pauf Neupane, Boris Shapiro, Hui Cao
Physics Faculty Research & Creative Works
We report the direct observation of the development of longrange spatial intensity correlation and the growth of intensity fluctuations inside random media. We fabricated quasitwodimensional disordered photonic structures and probed light transport from a third dimension. Good agreement between experiment and theory is obtained. We were able to manipulate the longrange intensity correlation and intensity fluctuations inside the disordered waveguides by simply varying the waveguide geometry.
Evidence For Magnetic Clusters In Ni₁₋ₓVₓ Close To The Quantum Critical Concentration, R. Wang, S. UbaidKassis, A. Schroeder, P. J. Baker, F. L. Pratt, S. J. Blundell, T. Lancaster, I. Franke, J. S. Möller, Thomas Vojta
Evidence For Magnetic Clusters In Ni₁₋ₓVₓ Close To The Quantum Critical Concentration, R. Wang, S. UbaidKassis, A. Schroeder, P. J. Baker, F. L. Pratt, S. J. Blundell, T. Lancaster, I. Franke, J. S. Möller, Thomas Vojta
Physics Faculty Research & Creative Works
The dmetal alloy Ni_{1x}V_{x} undergoes a quantum phase transition from a ferromagnetic ground state to a paramagnetic ground state as the vanadium concentration x is increased. We present magnetization, acsusceptibility and muonspin relaxation data at several vanadium concentrations near the critical concentration x_{c} ~ 11.6 % at which the onset of ferromagnetic order is suppressed to zero temperature. Below x_{c}, the muon data reveal a broad magnetic field distribution indicative of a longrange ordered ferromagnetic state with spatial disorder. We show evidence of magnetic clusters in the ferromagnetic phase and close to the phase boundary in ...
Universality Of Returning Electron Wave Packet In HighOrder Harmonic Generation With Midinfrared Laser Pulses, AnhThu Le, Hui Wei, Cheng Jin, Vu Ngoc Tuoc, Toru Morishita, C. D. Lin
Universality Of Returning Electron Wave Packet In HighOrder Harmonic Generation With Midinfrared Laser Pulses, AnhThu Le, Hui Wei, Cheng Jin, Vu Ngoc Tuoc, Toru Morishita, C. D. Lin
Physics Faculty Research & Creative Works
We show that a returning electron wave packet in highorder harmonic generation (HHG) with midinfrared laser pulses converges to a universal limit for a laser wavelength above about 3µm. The results are consistent among the different methods: a numerical solution of the timedependent Schrödinger equation, the strongfield approximation, and the quantum orbits theory. We further analyze how the contribution from different electron "trajectories" survives the macroscopic propagation in the medium. Our result thus provides a new framework for investigating the wavelength scaling law for the HHG yields.
Theoretical And Experimental Investigation Of (E, 2e) Ionization Of Argon 3p In Asymmetric Kinematics At Intermediate Energy, Sadek Amami, Melike Ulu, Zehra Nur Ozer, Murat Yavuz, Suay Kazgoz, Mevlut Dogan, Oleg Zatsarinny, Klaus Bartschat, Don H. Madison
Theoretical And Experimental Investigation Of (E, 2e) Ionization Of Argon 3p In Asymmetric Kinematics At Intermediate Energy, Sadek Amami, Melike Ulu, Zehra Nur Ozer, Murat Yavuz, Suay Kazgoz, Mevlut Dogan, Oleg Zatsarinny, Klaus Bartschat, Don H. Madison
Physics Faculty Research & Creative Works
The field of electronimpact ionization of atoms, or (e, 2e), has provided significant detailed information about the physics of collisions. For ionization of hydrogen and helium, essentially exact numerical methods have been developed which can correctly predict what will happen. For larger atoms, we do not have theories of comparable accuracy. Considerable attention has been given to ionization of inert gases and, of the inert gases, argon seems to be the most difficult target for theory. There have been several studies comparing experiment and perturbative theoretical approaches over the last few decades, and generally qualitative but not quantitative agreement is ...
Control Of Light Diffusion In A Disordered Photonic Waveguide, Raktim Sarma, Timofey Golubev, Alexey Yamilov, Hui Cao
Control Of Light Diffusion In A Disordered Photonic Waveguide, Raktim Sarma, Timofey Golubev, Alexey Yamilov, Hui Cao
Physics Faculty Research & Creative Works
We control the diffusion of light in a disordered photonic waveguide by modulating the waveguide geometry. In a single waveguide of varying crosssection, the diffusion coefficient changes spatially in two dimensions due to localization effects. The intensity distribution inside the waveguide agrees with the prediction of the selfconsistent theory of localization. Our work shows that wave diffusion can be efficiently manipulated without modifying the structural disorder.
Methods And Results Of A Search For Gravitational Waves Associated With GammaRay Bursts Using The Geo 600, Ligo, And Virgo Detectors, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Methods And Results Of A Search For Gravitational Waves Associated With GammaRay Bursts Using The Geo 600, Ligo, And Virgo Detectors, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
In this paper we report on a search for shortduration gravitational wave bursts in the frequency range 64 Hz1792 Hz associated with gammaray bursts (GRBs), using data from GEO 600 and one of the LIGO or Virgo detectors. We introduce the method of a linear search grid to analyze GRB events with large sky localization uncertainties, for example the localizations provided by the Fermi Gammaray Burst Monitor (GBM). Coherent searches for gravitational waves (GWs) can be computationally intensive when the GRB sky position is not well localized, due to the corrections required for the difference in arrival time between detectors ...
Search For Gravitational Waves Associated With ΓRay Bursts Detected By The Interplanetary Network, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Waves Associated With ΓRay Bursts Detected By The Interplanetary Network, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results of a search for gravitational waves associated with 223 γray bursts (GRBs) detected by the InterPlanetary Network (IPN) in 20052010 during LIGO's fifth and sixth science runs and Virgo's first, second, and third science runs. The IPN satellites provide accurate times of the bursts and sky localizations that vary significantly from degree scale to hundreds of square degrees. We search for both a wellmodeled binary coalescence signal, the favored progenitor model for short GRBs, and for generic, unmodeled gravitational wave bursts. Both searches use the event time and sky localization to improve the gravitational ...
Theoretical TripleDifferential Cross Sections Of A Methane Molecule By A ProperAverage Method, Hari Chaluvadi, C. G. Ning, Don H. Madison
Theoretical TripleDifferential Cross Sections Of A Methane Molecule By A ProperAverage Method, Hari Chaluvadi, C. G. Ning, Don H. Madison
Physics Faculty Research & Creative Works
For the last few years, our group has calculated cross sections for electronimpact ionization of molecules using the molecular threebody distortedwave approximation coupled with the orientationaveraged molecular orbital (OAMO) approximation. This approximation was very successful for calculating ionization cross sections for hydrogen molecules and to a lesser extent nitrogen molecules. Recently we used the approximation to calculate single ionization cross sections for the 1t_{2} state of methane (CH_{4}) and we found major discrepancies with the experimental data. Here we investigate the validity of the OAMO approximation by calculating cross sections that have been properly averaged over all molecular ...
Fully Differential Cross Sections For ElectronImpact ExcitationIonization Of Aligned D₂, Esam Ali, A. L. Harris, J. Lower, E. Weigold, ChuangGang Ning, Don H. Madison
Fully Differential Cross Sections For ElectronImpact ExcitationIonization Of Aligned D₂, Esam Ali, A. L. Harris, J. Lower, E. Weigold, ChuangGang Ning, Don H. Madison
Physics Faculty Research & Creative Works
We examine fully differential cross sections for 176 eV electronimpact dissociative excitationionization of orientated D2 for transitions to final ion states 2sσ_{g}, 2pσ_{u}, and 2pπ_{u}. In previous work [Phys. Rev. A 88, 062705 (2013)PLRAAN1050294710.1103/PhysRevA.88.062705], we calculated these cross sections using the molecular fourbody distorted wave (M4DW) method with the groundstate D2 wave function being approximated by a product of two Dyson 1stype orbitals. The theoretical results were compared with experimental measurements for five different orientations of the target molecule (four in the scattering plane and one perpendicular to the scattering plane). For ...
The Structure Of D₂ONonane Nanodroplets, Harshad Pathak, Abdalla Obeidat, Gerald Wilemski, Barbara Wyslouzil
The Structure Of D₂ONonane Nanodroplets, Harshad Pathak, Abdalla Obeidat, Gerald Wilemski, Barbara Wyslouzil
Physics Faculty Research & Creative Works
We study the internal structure of nanometersized D_{2}Ononane aerosol droplets formed in supersonic nozzle expansions using a variety of experimental techniques including small angle Xray scattering (SAXS). By fitting the SAXS spectra to a wide range of droplet structure models, we find that the experimental results are inconsistent with mixed droplets that form aqueous coreorganic shell structures, but are quite consistent with spherically asymmetric lensonsphere structures. The structure that agrees best with the SAXS data and Fourier transform infrared spectroscopy measurements is that of a nonane lens on a sphere of D2O with a contact angle in the ...
Search For Gravitational Radiation From Intermediate Mass Black Hole Binaries In Data From The Second LigoVirgo Joint Science Run, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Radiation From Intermediate Mass Black Hole Binaries In Data From The Second LigoVirgo Joint Science Run, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
This paper reports on an unmodeled, allsky search for gravitational waves from merging intermediate mass black hole binaries (IMBHB). The search was performed on data from the second joint science run of the LIGO and Virgo detectors (July 2009October 2010) and was sensitive to IMBHBs with a range up to ∼200Mpc, averaged over the possible sky positions and inclinations of the binaries with respect to the line of sight. No significant candidate was found. Upper limits on the coalescencerate density of nonspinning IMBHBs with total masses between 100 and 450M_{⊙} and mass ratios between 0.25 and 1 were placed ...
The Clustering Of Galaxies In The SdssIii Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations In The Data Releases 10 And 11 Galaxy Samples, Lauren Anderson, Eric Aubourg, Shun Saito, For Full List Of Authors, See Publisher's Website.
The Clustering Of Galaxies In The SdssIii Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations In The Data Releases 10 And 11 Galaxy Samples, Lauren Anderson, Eric Aubourg, Shun Saito, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations (BAO) in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey, which is part of the Sloan Digital Sky Survey III. Our results come from the Data Release 11 (DR11) sample, containing nearly one million galaxies and covering approximately 8500 square degrees and the redshift range 0.2 < z < 0.7. We also compare these results with those from the publicly released DR9 and DR10 samples. Assuming a concordance Λ cold dark matter (ΛCDM) cosmological model, the DR11 sample covers a volume of 13 Gpc^{3} and is the largest region of the Universe ever surveyed at this density. We measure the correlation function and power spectrum, including densityfield reconstruction of the BAO feature. The acoustic ...
Waveforms For Optimal SubKev HighOrder Harmonics With Synthesized Two Or ThreeColour Laser Fields, Cheng Jin, Guoli Wang, Hui Wei, AnhThu Le, C. D. Lin
Waveforms For Optimal SubKev HighOrder Harmonics With Synthesized Two Or ThreeColour Laser Fields, Cheng Jin, Guoli Wang, Hui Wei, AnhThu Le, C. D. Lin
Physics Faculty Research & Creative Works
Highorder harmonics extending to the Xray region generated in a gas medium by intense lasers offer the potential for providing tabletop broadband light sources but so far are limited by their low conversion efficiency. Here we show that harmonics can be enhanced by one to two orders of magnitude without an increase in the total laser power if the laser's waveform is optimized by synthesizing two or threecolour fields. The harmonics thus generated are also favourably phasematched so that radiation is efficiently built up in the gas medium. Our results, combined with the emerging intense highrepetition MHz lasers, promise ...
Complete Momentum Balance In Ionization Of H₂ By 75KevProton Impact For Varying Projectile Coherence, Sachin D. Sharma, T. P. Arthanayaka, Ahmad Hasan, B. R. Lamichhane, J. Remolina, Adolph P. Smith, Michael Schulz
Complete Momentum Balance In Ionization Of H₂ By 75KevProton Impact For Varying Projectile Coherence, Sachin D. Sharma, T. P. Arthanayaka, Ahmad Hasan, B. R. Lamichhane, J. Remolina, Adolph P. Smith, Michael Schulz
Physics Faculty Research & Creative Works
We report on a kinematically complete experiment on ionization of H_{2} by proton impact. While a significant impact of the projectile coherence properties on the scatteringangle dependence of doubledifferential cross sections (DDCSs), reported earlier, is confirmed by the present data, only weak coherence effects are found in the electron and recoilion momentum dependence of the DDCSs. This suggests that the phase angle in the interference term is determined primarily by the projectile momentum transfer rather than by the recoilion momentum. We therefore cannot rule out the possibility that the interference observed in our data is not primarily due to ...