Results 71 to 80 of about 113,880 (205)
The Effect of Mars Impact Crater Topography on Seismic Signals
Journal of Geophysical Research: Planets, Volume 130, Issue 8, August 2025.Abstract Meteorite impacts on Mars result in seismic recordings with relatively small surface wave amplitudes compared to body wave amplitudes, unlike what is generally observed in earthquakes. Here, we test with numerical modeling whether Mars' topography could be responsible for the preferential attenuation of surface waves. We use a spectral element
J. Charoensawan +5 more
wiley +1 more source
Dynamical coherent states and physical solutions of quantum cosmological bounces
, 2007 A new model is studied which describes the quantum behavior of transitions through an isotropic quantum cosmological bounce in loop quantum cosmology sourced by a free and massless scalar field.
A. Ashtekar +7 more
core +1 more source
A QUANTUM APPROACH TO COSMOLOGY [PDF]
, 2006 We present a theory based upon the treatment of the gravitational field as a sea of gravity quanta, as defined elsewhere. The resultant model for the Universe is a static one, like Einstein first saw, with a new feature: a local shrinking quantum world that completely explains the Hubble red shift under a new point of view.
openaire +3 more sources
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
Quantum Potential Approach to Quantum Cosmology [PDF]
, 1995 In this paper we discuss the quantum potential approach of Bohm in the context of quantum cosmological model. This approach makes it possible to convert the wavefunction of the universe to a set of equations describing the time evolution of the universe.
Blaut, Arkadiusz +1 more
core +1 more source
, 2012 I review two cosmological paradigms which are alternative to the current inflationary scenario. The first alternative is the "matter bounce", a non-singular bouncing cosmology with a matter-dominated phase of contraction.
A. Ashtekar +136 more
core +1 more source
Quantum Cosmology in the Light of Quantum Mechanics [PDF]
Galaxies, 2019 There is a formal analogy between the evolution of the universe, when this is seen as a trajectory in the minisuperspace, and the worldline followed by a test particle in a curved spacetime. The analogy can be extended to the quantum realm, where the trajectories are transformed into wave packets that give us the probability of finding the universe or ...
openaire +5 more sources
Steady State Cosmology and Quantum Electrodynamics [PDF]
, 1970 Gerhard Börner
openalex +1 more source
TCP, quantum gravity, the cosmological constant and all that... [PDF]
, 1985 Tom Banks
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