[PDF] Top 20 Cosmological perturbations from full quantum gravity

... effective cosmological dynamics in which not only a semiclassical large Friedmann universe is reproduced under generic conditions, but also the cosmological singularity is replaced by a quantum ... See full document

... curvature perturbations, with an almost perfectly scale-invariant power ...well-defined quantum field theory must possess a UV fixed point, signifying conformal invariance at high ...a quantum ... See full document

... Newtonian gravity and it increases at higher gravity as quan- tum-mechanical ...comes from black holes (where the matter is so squeezed that the quantum potential energy becomes comparable ... See full document

... Quantum mechanics of a cosmological bounce. — For homogeneous, isotropic cosmologies, one can choose a Weyl gauge in which the metric is static and the scalars ð ϕ; ~ χ Þ encode all of the dynamics. While ... See full document

... One of the actual problems for modern cosmology is the theoretical description of quintessence field—one type of dark energy. Its observable properties are the scale ho- mogeneity and the absence of clustering [22]. ... See full document

... shear from the surrounding ...The full dynamical equations then reduce to a set of nine second-order ordinary differential equations, which reproduce the linear regime behaviour but can be evolved past ... See full document

... the quantum scalar field on the given background metric (cosmological homogeneous, but anisotropic, ...the quantum problem requires knowing the boundary conditions, while the latter can be imposed ... See full document

... effective cosmological models from theories of quan- tum gravity is to view the former as a mean-field (hydrodynamic) description of the latter, which describes a universe formed by a ‘condensate’ of ... See full document

... Since all the observational evidence for CDM is through its gravitational interactions, it has been tempt- ing to explore a modification of Einstein gravity as a substitute (e.g. [5–8]). However, given the range ... See full document

... the quantum state of the universe as a whole can be written as a superposition of different states with def- inite values of the modes in that basis—“branches”—which do not interfere with one ...of ... See full document

... super-dense quantum”, whose disintegration gave birth to all the current components of the universe [1] ...Using quantum mechanics, he proposes to explain the origins of the world from the point of ... See full document

... of quantum gravity, so it seems reasonable to start from the hypothesis that at presently accessible scales the influence of these higher order contributions is ...familiar from classical ... See full document

... of quantum gravity, so it seems reasonable to start from the hypothesis that at presently accessible scales the influence of these higher order contributions is ...familiar from classical ... See full document

... to quantum gravity [3], itself a second quantized formulation of loop quantum gravity (LQG) [4, 5], with spin network vertices or elementary simplices as ‘ quanta ’ of the GFT fi eld, or ‘ ... See full document

... massive gravity, etc., so that the gravity itself has additional scalar ...it from low energy GR ...modified gravity theory but without the scalar gravitation mode so that the usual scalar ... See full document

... contemporary quantum field theory, a ghost field, or gauge ghost is an unphysical state in a gauge ...in quantum electrodynamics, in order to maintain manif- est Lorentz invariance, one uses a ... See full document

... Our proposal can easily be extended to include both closed and open systems by realizing the matter Hilbert space as a tensor product of a matter-system and a matter-environment Hilbert space: In some given closed ... See full document

... and quantum vacuum allows one’s to simulate many phenomena in high energy physics and Cosmology, including axial anomaly, baryon-production and magneto-genesis, event horizon and Hawking radiation, rotating ... See full document

... McTaggart is well known for his argument supporting the unreality of time, but McTaggart’s positive views about the nature of timeless reality are not a focus of contemporary philosophical discussion. This is prima facie ... See full document

... The algebra generated by the relative observables is subsequently quantized with the use of the BV formalism. For the purposes of perturbation theory we replace the diffeomorphism group by the Lie algebra of vector ... See full document