Results 161 to 170 of about 624,114 (277)
Extensive Secondary Cratering From the InSight Sol 1034a Impact Event
Journal of Geophysical Research: Planets, Volume 129, Issue 12, December 2024.Abstract Impact cratering is one of the fundamental processes throughout the history of the Solar System. The formation of new impact craters on planetary bodies has been observed with repeat images from orbiting satellites. However, the time gap between images is often large enough to preclude detailed analysis of smaller‐scale features such as ...
P. M. Grindrod +12 more
wiley +1 more source
Backreaction of fermionic perturbations in the Hamiltonian of hybrid loop quantum cosmology [PDF]
, 2018 We discuss the freedom available in hybrid loop quantum cosmology to define canonical variables for the matter content and investigate whether this can be used to derive a quantum field theory with good properties for the matter sector.
B. E. Navascu'es +2 more
semanticscholar +1 more source
Adiabatic and non-adiabatic perturbations for loop quantum cosmology
, 2011 We generalize the perturbations theory of loop quantum cosmology to a hydrodynamical form and define an effective curvature perturbation on an uniform density hypersurfaces $\zeta_e$. As in the classical cosmology, $\zeta_e$ should be gauge-invariant and
C. Rovell +6 more
core +1 more source
On the Hamiltonian Constraint of Loop Quantum Cosmology
, 2005 In this paper we construct the Hamiltonian constraint operator of loop quantum cosmology using holonomies defined for arbitrary irreducible SU(2) representations labeled by spin J.
A. Ashtekar +5 more
core +1 more source
Properties of Fluctuating States in Loop Quantum Cosmology
Mathematics, 2019 In loop quantum cosmology, the values of volume fluctuations and correlations determine whether the dynamics of an evolving state exhibits a bounce. Of particular interest are states that are supported only on either the positive or the negative part of ...
Martin Bojowald
doaj +1 more source
Towards inhomogeneous loop quantum cosmology: triangulating Bianchi IX with perturbations [PDF]
arXiv, 2010 This brief article sums up results obtained in arXiv:0911.2653, which develops a constrained SU(2) lattice gauge theory in the "dipole" approximation. This is a further step toward the issue of a (inhomogeneous) loop quantum cosmology and its merging into loop quantum gravity.
arxiv
Cosmological perturbations in teleparallel Loop Quantum Cosmology [PDF]
Journal of Cosmology and Astroparticle Physics, 2013 version accepted for publication in ...
openaire +4 more sources
Universe, 2018 The understanding of black holes in loop quantum gravity is becoming increasingly accurate. This review focuses on the possible experimental or observational consequences of the underlying spinfoam structure of space-time.
Aurélien Barrau +2 more
doaj +1 more source
Switching Internal Times and a New Perspective on the `Wave Function of the Universe’
Universe, 2019 Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with ...
Philipp A. Höhn
doaj +1 more source
Perturbations in loop quantum cosmology [PDF]
arXiv, 2012 The era of precision cosmology has allowed us to accurately determine many important cosmological parameters, in particular via the CMB. Confronting Loop Quantum Cosmology with these observations provides us with a powerful test of the theory. For this to be possible we need a detailed understanding of the generation and evolution of inhomogeneous ...
arxiv