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Browsing Research and Publications - Department of Physics & Astronomy by Title

Now showing items 381-400 of 853

The Lack of Very Ultraluminous X-Ray Sources in Early-Type Galaxies

Irwin, Jimmy A.; Bregman, Joel N.; Athey, Alex E. (2004-02-01)
Lagrangian and Hamiltonian Descriptions of Yang-Mills Particles

Balachandran, A. P.; Borchardt, S.; Stern, A. (American Physical Society, 1978-06-15)

A new Lagrangian L is proposed for the description of a particle with a non-Abelian charge in interaction with a Yang-Mills field. The canonical quantization of L is discussed. At the quantum level L leads to both irreducible ...
Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event

Lin, Dacheng; Godet, Olivier; Ho, Luis C.; Barret, Didier; Webb, Natalie A.; Irwin, Jimmy A. (2017-02-24)

The X-ray source 2XMM J123103.2+110648 was previously found to show pure thermal X-ray spectra and an ∼3.8 h periodicity in three XMM–Newton X-ray observations in 2003– 2005, and the optical spectrum of the host galaxy ...
A Large HST Program: Effective Temperatures of Cataclysmic Variable White Dwarfs

Pala, A. F.; Gänsicke, B. T.; Beuermann, K.; Bildsten, L.; Martino, D. De; Godon, P.; Henden, A. A.; Hubeny, I.; Knigge, C.; Long, K. S.; Marsh, T. R.; Patterson, J.; Schreiber, M. R.; Sion, E. M.; Szkody, P.; Townsley, Dean M.; Zorotovic, M. (2011)
Lateral Distribution of Muons in IceCube Cosmic Ray Events

Santander, Marcos (American Physical Society, 2013-01-07)

In cosmic ray air showers, the muon lateral separation from the center of the shower is a measure of the transverse momentum that the muon parent acquired in the cosmic ray interaction. IceCube has observed cosmic ray ...
Lateral Standing Spin Waves in Permalloy Antidot Arrays

Mankey, Gary (AIP Publishing, 2004-05-25)

Spin wave modes in permalloy antidot arrays have been investigated with ferromagnetic resonance at 9.7 GHz. In contrast to a quadratic dispersion expected for exchange standing spin waves, nearly linear relationship exists ...
Laterally Propagating Detonations in Thin Helium Layers on Accreting White Dwarfs

Townsley, Dean M.; Moore, Kevin; Bildsten, Lars (2012-08-10)
Lattice Symmetry and Magnetization Reversal in Micron-size Antidot Arrays in Permalloy Film

Mankey, Gary (2002-05-13)

The magnetization reversal in four arrays of micron-size circular holes (antidots) in a Permalloy film has been studied by means of quantitative magneto-optic Kerr vector magnetometry and magnetic force microscopy. The ...
The Leading Arm, Ringed Spiral Galaxy NGC 4622 – A Diagnostic Case of a Retrograde Tidal Encounter

Buta, Ronald J.; Crocker, D. A.; Byrd, G. G. (1992-05)

Some of the basic morphologic and photometric properties of the southern galaxy NGC 4622, the only galaxy known to have at least one leading spiral arm, are described. BVI surface photometry is used to establish that the ...
Lepton Flavor Violating Processes and Muon g−2 in the Minimal Supersymmetric SO(10) Model

Okada, Nobuchika (2003-08-26)

In the recently proposed minimal supersymmetric SO(10) model, the neutrino Dirac Yukawa coupling matrix, together with all the other fermion mass matrices, is completely determined once free parameters in the model are ...
Leptonic CP Violation and Leptogenesis in Minimal Supersymmetric SU(4)⌄c × SU(2)⌄L × SU(2)⌄R

Okada, Nobuchika (2018-07-30)

We consider a supersymmetric SU(4)⌄c × SU(2)⌄L × SU(2)⌄R model with a minimal number of Higgs multiplets and Dirac and Majorana CP-violating phases in the neutrino flavor mixing matrix. The model incorporates the charged ...
The Light Variations of Nonradial Pulsators: Theory and Application to the Line Profile Variable 53 Persei

Buta, Ronald; M. Smith (1979-08)

The nonradial pulsator 53 Persei (B4.5 V) has been observed during 13 nights in late 1977 to determine whether its photometric variations are reminiscent of its spectral line profile changes. Inspection of the resulting ...
Light W-ino Dark Matter in Brane World Cosmology

Okada, Nobuchika (American Physical Society, 2006-03-17)

The thermal relic density of W-ino-like neutralino dark matter in brane world cosmology is studied. The expansion law at a high energy regime in brane world cosmology is modified from the one in standard cosmology, and the ...
A Likely Decade-Long Sustained Tidal Disruption Event

Lin, Dacheng; Guillochon, James; Komossa, S.; Ramirez-Ruiz, Enrico; Irwin, Jimmy A.; Maksym, W. Peter; Grupe, Dirk; Godet, Olivier; Webb, Natalie A.; Barret, Didier; Zauderer, B. Ashley; Duc, Pierre-Alain; Carrasco, Eleazar R.; Gwyn, Stephen D. J. (2017-02-02)

Multiwavelength flares from tidal disruption and accretion of stars can be used to find and study otherwise dormant massive black holes in galactic nuclei 1 . Previous well-monitored candidate flares were short-lived, with ...
Limit on the Diffuse Flux of Ultrahigh Energy Tau Neutrinos with the Surface Detector of the Pierre Auger Observatory

Santander, Marcos (2009-05-01)

Data collected at the Pierre Auger Observatory are used to establish an upper limit on the diffuse flux of tau neutrinos in the cosmic radiation. Earth-skimming ντ may interact in the Earth’s crust and produce a τ lepton ...
Limits on Neutrino Emission from Gamma-Ray Bursts with the 40 String IceCube Detector

Santander, Marcos (2011-04-07)

IceCube has become the first neutrino telescope with a sensitivity below the TeV neutrino flux predicted from gamma-ray bursts if gamma-ray bursts are responsible for the observed cosmic-ray flux above 10¹⁸ eV. Two separate ...
Local Manipulation and Reversal of the Exchange Bias Field by Ion Irradiation in FeNi/FeMn Double layers

Mougin, A.; Mewes, T.; Jung, M.; Engel, D.; Ehresmann, A.; Schmoranzer, H.; Fassbender, J.; Hillebrands, B. (2001)

Both the direction and the strength of the exchange bias field Heb of an FeNi/FeMn double layer are manipulated locally by He ion irradiation in an applied magnetic field. The magnitude of Heb is enhanced over its initial ...
Locating the Accretion Footprint on a Herbig Ae Star: MWC 480

Silverstone, Murray (American Astronomical Society, 2010-08-20)

Accretion is a fundamental process which establishes the dynamics of the protoplanetary disk and the final properties of the forming star. In solar-type stars, the star–disk coupling is determined by the magnetic field ...
Location and Direction Dependent Effects in Collider Physics from Noncommutativity

Okada, Nobuchika (2010-07-28)

We examine the leading order noncommutative corrections to the differential and total cross sections for e⁺e⁻ → qq̅. After averaging over the Earth’s rotation, the results depend on the latitude for the collider, as well ...
Location and Direction Dependent Effects in Collider Physics from Noncommutativity

Haghighat, Mansour; Okada, Nobuchika; Stern, Allen (2010-06-28)

We examine the leading order noncommutative corrections to the differential and total cross sections for e+ e− → qq‾. After averaging over the Earth’s rotation, the results depend on the latitude for the collider, as well ...

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Browsing Research and Publications - Department of Physics & Astronomy by Title

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