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In this habilitation thesis we provide an introduction to gravitational models in two spacetime dimensions. Focus is put on exactly solvable models. We begin by introducing and motivating different possible gravitational actions, including those of generalized dilaton theories as well as of purely ...
The amount of distortion in spacetime depends on the mass of material that is involved and on how concentrated and compact it is. Terrestrial objects, such as the book you are reading, have far too little mass to introduce any significant distortion. Newton’s view of gravity is just fine f...
Fiorini, On Born–Infeld gravity in Weitzenbock spacetime. Phys. Rev. D 78, 124019 (2008) 49. G.R. Bengochea, R. Ferraro, Dark torsion as the cosmic speed-up. Phys. Rev. D 79, 124019 (2009) 50. E.V. Linder, Einstein's other gravity and the acceleration of the universe. Phys....
In the rest of this letter, we use the RS2 construction as a holographic framework to study the entanglement entropy of a general region in induced gravity, i.e., the 4D gravity theory on the brane. To do so, we assume two copies of AdS spacetime, cut each of them at some finite ...
The metric determines the casual structure of spacetime, but in quantum gravity it is also a dynamical field which must be quantized using this causal structure; this is the famous problem of time. A radical resolution of this paradox is proposed: remove the concept of space-like separation ...
Neutrino oscillations at the highest energies and longest baselines can be used to study the structure of spacetime and test the fundamental principles of quantum mechanics. If the metric of spacetime has a quantum mechanical description, its fluctuations at the Planck scale are expected to introduce...
G. Amelino-Camelia, Limits on the measurability of space-time distances in the semi-classical approximation of quantum gravity, Mod. Phys. Lett. A9 (1994) 3415-3422.Amelino-Camelia G. Limits on the measurability of space-time distances in the semi-classical approximation of quantum gravity....
actionswhicharelinearwithrespecttothesizeofthemanifold.Inadditionthe conceptofgeneralizeddeficitanglesappearinanaturalwayandisrelatedtohigher ordercurvatureterms.Theseanglesmaybeusedtointroducevariousaspectsof rigidityinsimplicialquantumgravity. Keywords:Simplicialgravity,integralinvariance,rigidityofspacetime PACSno:02....
thinner as the spacetime torsion gets stronger. for each model, the massless graviton is localized on the brane with the width of localization decreasing with the enhancement of the spacetime torsion, while the massive gravitons propagate in the bulk and contribute a correction term proportional to...