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 20 of 34 for “"Graviton"”.
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The propagator for graviton modes in supergravity on ADS5 x S5
… propagator for k ≥ 0 Kaluza-Klein modes of the graviton in supergravity (SUGRA) on AdS5 X S5 is calculated in part. This propagator could be useful in calculations of four-leg scattering amplitudes as a further test of the proposed holographic duality between SUGRA on AdSd and the conformal …
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Recent Progress in Quantum Gravity: Karch-Randall Braneworld, Entanglement Islands and Graviton Mass
… in a deformed KR braneworld model where the graviton is massless. At the end, we provide a general proof of our conjecture for a broad class of spacetimes (with dimension $D \geq 2 + 1$), which include asymptotically Anti-de Sitter spacetimes, using Gauss’ law.
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Cosmological And Astrophysical Tests Of Modified Gravity
… the tensor perturbations. The signature of the graviton mass on the cmb polarization spectrum will be studied. A moderate graviton mass (comparable to the hubble rate during recombination) leads to interesting modifications on the b mode polarization power spectrum. A large graviton mass is …
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Perturbative Quantum Gravity and Yang-Mills Theories in de Sitter Spacetime
… the physical equivalence of covariant Wightman graviton two-point function with the physical graviton two-point function. The Feynman propagators of the Faddeev-Popov ghosts for Yang-Mills theories and perturbative quantum gravity in the covariant gauge are infrared (IR) divergent in de Sitter …
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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
… at 95% CL with a lower mass limit for an RS1 graviton of 936 GeV and 714 GeV for the Bulk RS graviton.
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Worldsheet methods for perturbative quantum field theory
… showing that, in the case of the four graviton amplitude, the ambitwistor amplitude gives the expected kinematical prefactor; matching this amplitude to the field theory expectation in a particular kinematical regime; solving the one loop scattering equations in this kinematical regime; …
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Classical and quantum aspects of infinite derivative field theories and infinite derivative gravity
… In order to avoid ghosts, one modifies the graviton propagator by employing entire functions so that no new poles are introduced apart from the pole corresponding to the massless graviton of General Relativity. Inspired by infinite derivative gravity, we consider an infinite derivative …
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Search for gravitons using merged jets from Z boson decays with the ATLAS experiment
… (expected) lower limit on the mass of an excited graviton decaying to ZZ is 870 (950) GeV at 95% confidence level. Limits are also set on a more recent version of the Randall-Sundrum model where Standard Model particles are allowed to propagate in the five dimensional bulk. An excited graviton in …
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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
… a bulk Randall-Sundrum model with a heavy spin-2 graviton (G∗). Neither of these searches found evidence of any resonance, and exclusion limits are set on σ(pp → V ′) and σ(pp → G∗). For the 2012 ATLAS data, searches are performed for the G∗ and the W′. The sample corresponds to an integrated …
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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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Giant Magnons and Giant Gravitons
… S^{2}$ attached to the maximal $Z=0$ giant graviton by mapping from the general solution to static sine-Gordon theory on the interval. We then compute the values of the anomalous dimension, $\Delta-J$, of the dual gauge theory operators at finite $J$, examining the behaviour of the leading …
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Open strings and analytic non-integrability
… string solution ending on a Y = 0, maximal giant graviton. The solution that is used is the Hofman-Maldacena giant magnon. The method is also tested for open strings ending on a D5 and D7 brane. Two variations are used for the metric of the D7 brane. These are the S 2 × S 2 and the nested S 4 …
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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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Suche nach Kontakt-Wechselwirkungen und Gravitoneffekten in der tief-inelastischen Streuung bei HERA
… is analysed in terms of contact interactions or graviton effects in combination with large extra dimensions. The total amount of analysed data corresponds to an integrated luminosity of L_int=115 pb-1. The comparison of all data sets to their corresponding standard model expectation shows no …
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On aspects of infinite derivatives field theories & infinite derivative gravity
… Such modification maintains the massless graviton as the only true physical degree of freedom and avoids ghosts. Moreover, this class of modified gravity can address classical singularities. In this thesis some essential aspects of an infinite derivative theory of gravity are studied. …
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A Search For New Physics Using tt(bar) Resonances in the Lepton Plus Jets Channel at √(s) = 8 TeV in 20 fb⁻¹ of pp Collision Data at the ATLAS Experiment
… gluon (gKK), the Randall-Sundrum Kaluza-Klein graviton (GKK) and a spin-0 scalar particle.
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The Phase of the Cosmological Wavefunction
… part of the thesis classifies all parity-even graviton bispectra from local interactions to all orders in derivatives. We identify a minimal set of operators contributing to tree-level bispectra and show how diffeomorphism invariance links contact and exchange terms. Despite the complexity of …
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The origin of inflation.
… quantum mechanical vacuum fluctuations of the graviton field in the state described by no boundary initial conditions. Unlike the usual approach to inflationary perturbations, the Euclidean path integral unambiguously specifies the graviton propagators with no additional assumptions. From our …
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Black Holes, Galaxy Clusters and Gravitational Waves
… predictions to the ones from a Massive Graviton theory. We can discriminate between the two theories and produce posterior probability distribution functions. We also devise a method to combine multiple observations that y increases the amount of information that is possible to extract …
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The Cosmological Implications of Unitarity
… power of this result by using it to derive the graviton four-point wavefunction coefficient. This requires some additional recent developments in the cosmological bootstrap program exploiting locality and the relationship to flat space amplitudes which are reviewed.
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