Results 1 to 10 of about 6,479 (312)
Pregeometry and spontaneous time-space asymmetry
Journal of High Energy Physics, 2022 In pregeometry a metric arises as a composite object at large distances. We investigate if its signature, which distinguishes between time and space, could be a result of the dynamics rather than being built in already in the formulation of a model.
C. Wetterich
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Strings, branes, and gravity duals of gauge theories [PDF]
, 2002 We study the correspondence between certain supersymmetric gauge theories and their dual supergravity descriptions. Using low-energy brane probes of the super-gravity geometries we find moduli spaces of vacua, as expected from considering the dual gauge ...
Lovis, Kenneth John
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Gauge Theories and Holisms [PDF]
, 2004 Those looking for holism in contemporary physics have focused their attention primarily on quantum entanglement. But some gauge theories arguably also manifest the related phenomenon of nonseparability.
Healey, Richard
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Nonlinear relativistic tidal response of neutron stars
Journal of High Energy PhysicsWe investigate the nonlinear tidal response of relativistic neutron stars by computing the fully relativistic, static, quadratic Love numbers. Using both the worldline effective field theory for extended gravitating bodies and second-order perturbations ...
Paolo Pani +4 more
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Are there Einsteinian gravities involving covariant derivatives of the Riemann tensor?
Journal of High Energy Physics, 2022 We study the particle content of higher derivative theories of gravity built with contractions of the Riemann tensor and its covariant derivatives. In the absence of the latter, there is a family of theories exhibiting an Einsteinian spectrum known as ...
José D. Edelstein +2 more
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Stable causality and microcausality for Drummond–Hathrell photons
Journal of High Energy PhysicsLocal superluminal photon propagation arises at O α / m e 2 $$ \mathcal{O}\left(\alpha /{m}_e^2\right) $$ in the Drummond Hathrell (DH) effective action obtained by integrating out the electron in QED coupled to gravity.
Madhukar Deb, Jay Desai, Diptimoy Ghosh
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The viability of modified gravity theories
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
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Quantum Gravity: A Primer for Philosophers. [PDF]
, 2008 ‘Quantum Gravity’ does not denote any existing theory: the field of quantum gravity is very much a ‘work in progress’. As you will see in this chapter, there are multiple lines of attack each with the same core goal: to find a theory that unifies, in ...
Rickles, Dean
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Symplectic reduction and the problem of time in nonrelativistic mechanics [PDF]
, 2010 Symplectic reduction is a formal process through which degeneracy within the mathematical representations of physical systems displaying gauge symmetry can be controlled via the construction of a reduced phase space. Typically such reduced spaces provide
Thebault, Karim P Y +2 more
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Three denials of time in the interpretation of canonical gravity [PDF]
, 2011 The analysis of the temporal structure of canonical general relativity and the connected interpretational questions with regard to the role of time within the theory both rest upon the need to respect the fundamentally dual role of the Hamiltonian ...
Thebault, Karim P Y, Karim P Y Thébault
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