Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Gravitons"”.
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Giant Magnons and Giant Gravitons
… of giant magnons with non-maximal $Y=0$ giant gravitons and calculate the leading contribution to the associated magnon scattering phase. Our method necessarily describes all integrable scatterings of giant magnons with giant gravitons.
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Propagation of gravitons in the shock wave geometry
In this thesis, I study propagation of gravitons in the shock wave geometry in the context of the AdS/CFT correspondence, with the goal to uncover some constraint on the supergravity action in the AdS space. In studying the shock wave geometry in an anti-deSitter (AdS) space, I find that the …
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Search for gravitons using merged jets from Z boson decays with the ATLAS experiment
A search is presented for anomalous production of a pair of gauge bosons (ZZ or WZ) from the decay of a narrow massive resonance. Data corresponding to 2.0 fb-1 of integrated luminosity collected by the ATLAS experiment from proton-proton collisions at 7 TeV. Events with two charged leptons and …
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Quantum properties of black hole
… analogue model of Bose Einstein condensate of gravitons. In my investigation with different approach I could reach similar conclusion for Schwarzschild radius which is derived for Bose Einstein condensate of N-gravitons . I could calculate the pressure inside the condensed black hole. It is …
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Search for Excited Randall-Sundrum Gravitons with Semi-Leptonic Diboson Final States in 4.7 fb-1 of Proton-Proton Collisions using the ATLAS Detector at the Large Hadron Collider
This dissertation describes a search for resonant WW and WZ production in the lvjj decay channel using 4.701 fb-1 of sqrt(s) = 7 TeV LHC collision data collected by the ATLAS detector. Events with a single charged lepton, at least two jets and missing transverse energy are analyzed and no …
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Effects of Massive Fields on the Early Universe
… regimes. In chapter five we study the impact of gravitons with non-vanishing masses on the polarisation of th CMB . We also focus on putative modifications to the speed of the gravitational waves. We find that a change of the graviton speed shifts the acoustic peaks of the B-mode polarization and …
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Topics in Gauge/Gravity Duality
… with extending Mikhailov’s construction of giant gravitons from holomorphic functions to include meromorphic functions, which lead to giants with non-trivial topologies in AdS5_S5. We explore what topological configurations giants, whose dynamics preserve a certain amount of supersymmetry, assume. …
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Measurement of the Top Quark-Antitop Quark Differential Cross Section, dsigma/dM(tt), in Proton-Antiproton Collisions at Center of Mass Energy = 1.96 TEV
… model by looking for Kaluza Klein gravitons which decay to top quarks. I find kappa/MPl > 0.16 at the 95% confidence level.
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Gravitational wave cosmology in general relativity and Einstein-scalar-Gauss-Bonnet gravity.
… In EsGB gravity both spin-0 and spin-2 gravitons exist. As a result, only the Lorenz and spatial gauges can be applied simultaneously. Assuming the speed cT of the spin-2 graviton is the same as that of photons, we find explicitly the stability conditions of the theory and then obtain …
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Causality and the initial value problem in Modified Gravity
… the thesis we study the Shapiro time delay for gravitons in spherically symmetric spacetimes in Einstein–Gauss–Bonnet gravity (a Lovelock theory). In Lovelock theories, gravitons can propagate faster or slower than light. We show that, thanks to this property, it is possible for them to …
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Beyond the standard model searches with b-jets and hadronically decaying τ-leptons with the ATLAS detector
… pair production excludes bulk Randall-Sundrum gravitons GKK in the mass range 325 GeV < mGKK < 885 GeV for k/MP L = 1. For the simplified hMSSM minimal supersymmetric model for tan β = 2, resonances are excluded in the mass range 305 GeV < mH < 402 GeV. Finally, a re-interpretation of the Higgs …
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An Exploration of AdS3 Gravity as a Holographic Theory
… this construction, the field theory of boundary gravitons is used to compute the spectrum of gravitational fluctuations and in principle the gravitational contribution to scattering processes in the wormhole.
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Aspects of amplitudes, gravity & complexity
… construct the scattering amplitudes of massive gravitons to probe the so-called van Dam-Veltman-Zakharov (vDVZ) discontinuity in a purely on-shell manner, which we again find to be in agreement with the usual result. Additionally, we provide a clear physical picture as to the source of the …
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The gravity of modern amplitudes: using on-shell scattering amplitudes to probe gravity
… massive gravitinos (the superpartner of massive gravitons) and show that in the massless limit of the gravitinos there is the same discontinuity as found in massive gravity. This method sheds light on intricacies of the discontinuity that is obscured when handled classically.
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Messung der Reaktion e+ e- ZZ q anti-q l+ l mit dem L3-Detektor bei LEP
… In this extra dimensions, new particles (the gravitons'') can propagate, coupling to the Standard Model fields and enhancing the cross-section of the Z boson pair production. From the measured cross-section, no evidence for such particles is found, and a limit at a 95% confidence level to the …
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Die Methode der nichtlokalen effektiven Wirkung in höherdimensionalen Raumzeitmodellen
… geometries can feature extremely light massive gravitons. If <br>astrophysical objects have quadrupole moments oscillating at high frequencies <br>they might therefore produce gravitational waves which are a superposition of <br>the massless and one or more massive modes. As the massive …
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Search for Diboson resonances in 8 tev and 13 tev proton-proton collisions at the large hadron collider with the atlas detector
This thesis documents two searches for Diboson Resonances which were performed using data collected in 2012, 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model …