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Showing 1 to 14 of 14 for “"Gravity theory"”.
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Constrained dynamics and higher derivative systems in modified gravity
… by the addition of constraints if the original theory’s phase space is reduced. We then generalize this formalism to the most general higher derivative gravity theory where the action is not only linearly dependent on the Ricci scalar but also the quadratic curvature invariants in …
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Modeling the Dark Matter of Galaxy Clusters Using the Tensor-Vector-Scalar Theory of Alternate Gravity
… correct. The work herein tests a prescription of gravity theory known as Tensor-Vector-Scalar and is based upon the work of Angus et al. (2007). We add upon this work by extending the sample of galaxy clusters to five and testing the accepted Navarro, Frenk & White (NFW) dark matter potential …
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Cosmological And Astrophysical Tests Of Modified Gravity
… relativity. The cosmological perturbation theory of this model is studied and the predictions on temperature fluctuations of the cmb are found. The second one is drgt massive gravity. In this theory a charged black hole solution is found and compared to those in gr, folloby constraints on …
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Infinite Derivative Gravity : a finite number of predictions
Ghost-free Infinite Derivative Gravity (IDG) is a modifed gravity theory which can avoid the singularities predicted by General Relativity. This thesis examines the effect of IDG on four areas of importance for theoretical cosmologists and experimentalists. First, the gravitational potential …
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A study of circuit Complexity for Coherent States
… is a popular quantity in quantum information theory. It has made huge strides in recent years in the study of black hole dynamics. A brief definition of complexity is the measure of how difficult it is to implement a task. For a quantum system, complexity evaluates the difficulty of preparing …
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Modified Gravity with Torsion
… focuses on applications of a particular modified gravity theory, the extended Weyl Gauge Theory (eWGT), that was recently developed by Prof. Lasenby and Prof. Hobson. The applications corresponds to subsets of the full theory that are applicable to different cosmological and astrophysical sectors. …
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Transport in a Strongly Coupled Charged Relativistic Quantum Fluid in the Presence of a Chiral Anomaly & a Strong Magnetic Field Via Hydrodynamics & Holography
… a 4-dimensional supersymmetric conformal field theory in the thermal state, carrying axial charge, and subject to a strong external magnetic field, $B$. This theory has a chiral anomaly, which conspires with the magnetic field and axial charges to give rise to a host of novel transport …
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Experimental gravity with electromagnetic and gravitational waves
… spectra depends on our understanding of the gravity theory that describes the geometry around these compact objects. For electromagnetic observations, we must also understand the complex astrophysics that produces the observed radiation. In this dissertation, we describe our efforts to …
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Topics in double field theory
… that the field theoretical approach of string theory should involve winding type coordinates as well as the usual space-time coordinates. Recently developed double field theory is motivated from this idea and it implements T-duality manifestly by doubling the coordinates. In this thesis we will …
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Aspects of holography in Lorentz-violating gravity
… deep insights into the nature of quantum gravity. In particular, it is almost universally accepted nowadays that 'quantum gravity is holographic', so that the maximum amount of information allowed in a given region of spacetime is proportional to the area of the boundary rather than the …
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Modified Gravity and Cosmology on the Largest Scales
… dark energy, cosmic acceleration, modified gravity, and cosmic variance. Following an overview of the current understanding of the standard cosmological model in chapter 1, three pertinent topics are discussed in detail. A common theme among all chapters is the desire to explain the …
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Cauchy Slice Holography and the Semiclassical Approximation
… of a Euclidean CFT, we define a holographic theory that lives on Cauchy slices of the Lorentzian bulk. (More generally, for an arbitrary Hamiltonian constraint equation that closes, we show how to obtain it by an irrelevant deformation from a CFT with suitable anomalies.) The partition …
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Θεωρία χορδών και φυσικές εφαρμογές αυτής σε προβλήματα βαρύτητας και θεωρίας βαθμίδας
Σε αυτή την διδακτορική διατριβή μελετήσαμε την ευστάθεια δέσμιων καταστάσεων κουάρκ και δυονίων εντός της αντιστοιχίας AdS/CFT. Το κίνητρο για την μελέτη μας ήταν το ότι τα δυναμικά των δέσμιων αυτών καταστάσεων όπως αυτά υπολογίζονται εντός της αντιστοιχίας έχουν μερικές φορές συμπεριφορές οι …