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- Universidad Nacional Autónoma de MéxicoMX165 papers
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16 papers · 1 filter
Direct Measurement of Kirkwood-Rihaczek distribution for spatial properties of coherent light beam
Viktor Bollen, Yong Meng Sua, Kim Fook Lee
We present direct measurement of Kirkwood-Rihaczek (KR) distribution for spatial properties of coherent light beam in terms of position and momentum (angle) coordinates. We employ…
Hardness as a Spectral Peak Estimator for Gamma-Ray Bursts
Amir Shahmoradi, Robert J. Nemiroff
Simple hardness ratios are found to be a good estimator for the spectral peak energy in Gamma-Ray Bursts (GRBs). Specifically, a high correlation strength is found between the $νF_…
Theoretical Study of Physisorption of Nucleobases on Boron Nitride Nanotubes: A New Class of Hybrid Nano-Bio Materials
Saikat Mukhopadhyay, S. Gowtham, Ralph H. Scheicher +2
We investigate the adsorption of the nucleic acid bases, adenine (A), guanine (G), cytosine (C), thymine (T) and uracil (U) on the outer wall of a high curvature semiconducting sin…
Cartan's spiral staircase in physics and, in particular, in the gauge theory of dislocations
Markus Lazar, Friedrich W. Hehl
In 1922, Cartan introduced in differential geometry, besides the Riemannian curvature, the new concept of torsion. He visualized a homogeneous and isotropic distribution of torsion…
Testing the Gamma-Ray Burst Pulse Start Conjecture
Jon Hakkila, Robert J. Nemiroff
We test the hypothesis that prompt gamma-ray burst pulse emission starts simultaneously at all energies (the Pulse Start Conjecture). Our analysis, using a sample of BATSE bursts o…
Frequency Limits on Naked-Eye Optical Transients Lasting from Minutes to Years
Lior Shamir, Robert J. Nemiroff
How often do bright optical transients occur on the sky but go unreported? To constrain the bright end of the astronomical transient function, a systematic search for transients th…