Results 81 to 90 of about 60,199 (278)
Cosmological perturbations from five-dimensional inflation
Journal of High Energy PhysicsIt was recently proposed that five-dimensional inflation can relate the causal size of the observable universe to the present weakness of gravitational interactions by blowing up an extra compact dimension from the microscopic fundamental length of ...
Ignatios Antoniadis +2 more
doaj +1 more source
The Energy-Momentum Tensor for Cosmological Perturbations [PDF]
, 1997 We study the effective energy-momentum tensor (EMT) for cosmological perturbations and formulate the gravitational back-reaction problem in a gauge invariant manner.
A. A. Starobinsky +31 more
core +2 more sources
On cosmological perturbations of quasidilaton [PDF]
Classical and Quantum Gravity, 2013 A theory of the quasidilaton is an extension of massive gravity by a scalar field, nonlinearly realizing a certain new global symmetry of the Lagrangian. It has been shown that unlike pure massive gravity, this theory does admit homogeneous and isotropic spatially flat solutions.
D'Amico, Guido +3 more
openaire +3 more sources
Boreas, EarlyView.Glacial erosion during the Last Glacial Maximum (LGM) has removed much evidence of earlier glaciations and interglacials in the European Alps. At Gröbminger Mitterberg (GM), beneath a blanket of LGM till, a distinctive sediment archive preserves deposits predating the LGM.
Gerit E. U. Griesmeier +7 more
wiley +1 more source
Quantum coherence of cosmological perturbations
, 2017 The degrees of quantum coherence of cosmological perturbations of different spins are computed in the large-scale limit and compared with the standard results holding for a single mode of the electromagnetic field in an optical cavity.
Giovannini, Massimo
core +1 more source
Cosmological perturbations in teleparallel Loop Quantum Cosmology [PDF]
, 2013 Cosmological perturbations in Loop Quantum Cosmology (LQC) are usually studied incorporating either holonomy corrections, where the Ashtekar connection is replaced by a suitable sinus function in order to have a well-defined quantum analogue, or inverse ...
Haro, Jaime
core +1 more source
Small but mighty: Impact hazards from iron Near‐Earth Objects
Meteoritics &Planetary Science, EarlyView.Abstract Small asteroids can impact Earth unexpectedly, as demonstrated by the Chelyabinsk event in 2013. The warning times are likely to be short, and the first tools for fast hazard predictions have been developed in the last years for encounters with rocky or cometary objects, which quickly fragment in the atmosphere and cause airbursts. However, in
Robert Luther +5 more
wiley +1 more source
European Physical Journal C: Particles and Fields, 2021 We consider a cosmological scenario endowed with an interaction between the universe’s dark components – dark matter and dark energy. Specifically, we assume the dark matter component to be a pressure-less fluid, while the dark energy component is a ...
Andronikos Paliathanasis +4 more
doaj +1 more source
Effect of the Cubic Torus Topology on Cosmological Perturbations [PDF]
, 2021 Maxim Eingorn +4 more
openalex +1 more source
Rotational Perturbations of Friedmann-Robertson-Walker Type Brane-World Cosmological Models [PDF]
, 2002 First order rotational perturbations of the Friedmann-Robertson-Walker metric are considered in the framework of the brane-world cosmological models.
Chen, Chiang-Mei +3 more
core +2 more sources