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Recent documents in Physicsen-usSat, 09 Nov 2013 01:46:42 PST3600Prompt Atmospheric Neutrinos and Muons: NLO versus LO QCD Predictions
http://digitalcommons.lmu.edu/phys_fac/10
http://digitalcommons.lmu.edu/phys_fac/10Thu, 07 Nov 2013 18:25:24 PSTGabriele U. VarieschiConformal Cosmology and the Pioneer Anomaly
http://digitalcommons.lmu.edu/phys_fac/9
http://digitalcommons.lmu.edu/phys_fac/9Thu, 07 Nov 2013 18:20:38 PSTGabriele U. VarieschiKinematical Conformal Cosmology: Fundamental Parameters from Astrophysical Observations
http://digitalcommons.lmu.edu/phys_fac/8
http://digitalcommons.lmu.edu/phys_fac/8Thu, 07 Nov 2013 18:20:35 PSTGabriele U. VarieschiPrompt Atmospheric Neutrinos and Muons: Dependence on the Gluon Distribution Function
http://digitalcommons.lmu.edu/phys_fac/7
http://digitalcommons.lmu.edu/phys_fac/7Thu, 07 Nov 2013 18:16:15 PSTGabriele U. VarieschiMeasuring the Prompt Atmospheric Neutrino Flux with Down-Going Muons in Neutrino Telescopes
http://digitalcommons.lmu.edu/phys_fac/6
http://digitalcommons.lmu.edu/phys_fac/6Thu, 07 Nov 2013 18:16:01 PSTGabriele U. VarieschiBounds on Relic Neutrino Masses in the Z-burst Model
http://digitalcommons.lmu.edu/phys_fac/5
http://digitalcommons.lmu.edu/phys_fac/5Thu, 07 Nov 2013 18:15:45 PSTGabriele U. VarieschiMeasurement of the Gluon Parton Distribution Function at Small x with Neutrino Telescopes
http://digitalcommons.lmu.edu/phys_fac/4
http://digitalcommons.lmu.edu/phys_fac/4Thu, 07 Nov 2013 18:15:32 PST
We analyze the possibility that neutrino telescopes may provide an experimental determination of the slope λ of the gluon distribution in the proton at momentum fractions x smaller than the accelerator reach. The method is based on a linear relation between λ and the spectral index ~slope! of the down-going atmospheric muon flux above 100 TeV, for which there is no background. Considering the uncertainties in the charm production cross section and in the cosmic ray composition, we estimate the error on the measurement of l through this method, excluding the experimental error of the telescopes, to be ±0.2.
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Gabriele U. VarieschiA Kinematical Approach to Conformal Cosmology
http://digitalcommons.lmu.edu/phys_fac/3
http://digitalcommons.lmu.edu/phys_fac/3Thu, 07 Nov 2013 18:15:25 PST
We present an alternative cosmology based on conformal gravity, as originally introduced by H. Weyl and recently revisited by P. Mannheim and D. Kazanas. Unlike past similar attempts our approach is a purely kinematical application of the conformal symmetry to the Universe, through a critical reanalysis of fundamental astrophysical observations, such as the cosmological redshift and others. As a result of this novel approach we obtain a closed-form expression for the cosmic scale factor R(t) and a revised interpretation of the space-time coordinates usually employed in cosmology. New fundamental cosmological parameters are introduced and evaluated. This emerging new cosmology does not seem to possess any of the controversial features of the current standard model, such as the presence of dark matter, dark energy or of a cosmological constant, the existence of the horizon problem or of an inﬂationary phase. Comparing our results with current conformal cosmologies in the literature, we note that our kinematic cosmology is equivalent to conformal gravity with a cosmological constant at late (or early) cosmological times. The cosmic scale factor and the evolution of the Universe are described in terms of several dimensionless quantities, among which a new cosmological variable δ emerges as a natural cosmic time. The mathematical connections between all these quantities are described in details and a relationship is established with the original kinematic cosmology by L. Infeld and A. Schild. The mathematical foundations of our kinematical conformal cosmology will need to be checked against current astrophysical experimental data, before this new model can become a viable alternative to the standard theory.
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Gabriele U. VarieschiEight Minutes and a Half
http://digitalcommons.lmu.edu/phys_fac/2
http://digitalcommons.lmu.edu/phys_fac/2Thu, 07 Nov 2013 18:15:21 PSTGabriele U. VarieschiThe Projectile Inside the Loop
http://digitalcommons.lmu.edu/phys_fac/1
http://digitalcommons.lmu.edu/phys_fac/1Thu, 07 Nov 2013 18:15:14 PSTGabriele U. Varieschi