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Amsterdam-Zuidoost, Netherlands

Kuijer P.G.,National Institute for Subatomic Physics
Nuclear Physics B - Proceedings Supplements | Year: 2011

The ALICE experiment has been recording pp collisions since the start of the Large Hadron Collider in spring 2010. This contribution describes the current status of the detector and the first physics results obtained. © 2011 Elsevier B.V. Source

van den Broek T.,Radboud University Nijmegen | van den Broek T.,National Institute for Subatomic Physics | van Suijlekom W.D.,Radboud University Nijmegen
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

We derive supersymmetric quantum chromodynamics from a noncommutative spin manifold. We extend the model of Chamseddine and Connes that leads to the Einstein-Yang-Mills action and apply the spectral action principle to derive the Lagrangian of supersymmetric QCD, including soft supersymmetry breaking (negative sign) mass terms for the squarks. We find that these results are in good agreement with the physics literature. © 2011 Elsevier B.V. Source

van Leeuwen M.,National Institute for Subatomic Physics | van Leeuwen M.,University Utrecht
Nuclear and Particle Physics Proceedings | Year: 2016

A study of several observables characterising fragment distributions of medium-modified parton showers using the JEWEL and Q-PYTHIA models is presented, with emphasis on the relation between the different observables. © 2016 Elsevier B.V. Source

Del Pozzo W.,National Institute for Subatomic Physics
Journal of Physics: Conference Series | Year: 2014

Second-generation ground-based laser interferometers are expected to deliver a wealth of gravitational waves (GW) events from coalescing compact binaries up to a redshift of about 0.3. Being free of the systematics affecting electromagnetic measurements, GW offer the possibility of an independent measurement of H0. This paper presents a method based on Bayesian inference aimed at estimating the value of the cosmological parameters for any GW event. In contrast to earlier work, this framework does not require the precise identification of the putative optical counterpart, but it considers all the potential galaxy hosts consistent with the recovered sky position and distance posterior distributions. When applied to the upcoming network of second generation interferometers, 50 GW events will yield a measurement of H 0 with an uncertainty of a few per cents. © Published under licence by IOP Publishing Ltd. Source

Del Pozzo W.,National Institute for Subatomic Physics | Del Pozzo W.,University of Birmingham
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

The advanced worldwide network of gravitational waves (GW) observatories is scheduled to begin operations within the current decade. Thanks to their improved sensitivity, they promise to yield a number of detections and thus to open new observational windows for astronomy and astrophysics. Among the scientific goals that should be achieved, there is the independent measurement of the value of the cosmological parameters, hence an independent test of the current cosmological paradigm. Because of the importance of such a task, a number of studies have evaluated the capabilities of GW telescopes in this respect. However, since GW do not yield information about the source redshift, different groups have made different assumptions regarding the means through which the GW redshift can be obtained. These different assumptions imply also different methodologies to solve this inference problem. This work presents a formalism based on Bayesian inference developed to facilitate the inclusion of all assumptions and prior information about a GW source within a single data analysis framework. This approach guarantees the minimization of information loss and the possibility of including naturally event-specific knowledge (such as the sky position for a gamma ray burst-GW coincident observation) in the analysis. The workings of the method are applied to a specific example, loosely designed along the lines of the method proposed by Schutz in 1986, in which one uses information from wide-field galaxy surveys as prior information for the location of a GW source. I show that combining the results from few tens of observations from a network of advanced interferometers will constrain the Hubble constant H 0 to an accuracy of ∼4%-5% at 95% confidence. © 2012 American Physical Society. Source

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