Results 61 to 70 of about 536,719 (375)
The problem of singularities and chaos in cosmology [PDF]
, 2010 We consider different aspects of the problem of cosmological singularity such as the BKL oscillatory approach to the singularity, the new features of the cosmological dynamics in the neighbourhood of the singularity in multidimensional and superstring ...
Kamenshchik, A. Yu.
core +1 more source
Cosmological imprint of an energy component with general equation of state [PDF]
, 1997 We examine the possibility that a significant component of the energy density of the Universe has an equation of state different from that of matter, radiation, or cosmological constant ({Lambda} ).
R. Caldwell, R. Dave, P. Steinhardt
semanticscholar +1 more source
On Dynamics of Brans--Dicke Theory of Gravitation
, 2010 We study longstanding problem of cosmological clock in the context of Brans-Dicke theory of gravitation. We present the Hamiltonian formulation of the theory for a class of spatially homogenous cosmological models.
Farajollahi, Hossein +2 more
core +1 more source
Cosmological Quantum String Vacua and String-String Duality [PDF]
, 1996 Implications of string-string dualities to cosmological string vacua are discussed. Cosmological vacua of classical string theories comprise of disjoint classses mapped one another by scale-factor T-duality.
Antoniadis +23 more
core +2 more sources
Cosmological parameters from the BOSS galaxy power spectrum [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 We present cosmological parameter measurements from the publicly available Baryon Oscillation Spectroscopic Survey (BOSS) data on anisotropic galaxy clustering in Fourier space.
M. Ivanov, M. Simonovi'c, M. Zaldarriaga
semanticscholar +1 more source
Zeitschrift für Naturforschung A, 2022 AbstractWe give an introduction into quantum cosmology with emphasis on its conceptual parts. After a general motivation, we review the formalism of canonical quantum gravity on which discussions of quantum cosmology are usually based. We then present the minisuperspace Wheeler–DeWitt equation and elaborate on the problem of time, the imposition of ...
Kiefer, Claus, Sandhoefer, Barbara
openaire +2 more sources
The FAST Project - A Next Generation UHECR Observatory
EPJ Web of Conferences, 2017 We present a concept for large-area, low-cost detection of ultrahigh-energy cosmic rays (UHECRs) with a Fluorescence detector Array of Single-pixel Telescopes (FAST)b, addressing the requirements for the next generation of UHECR experiments.
Fujii Toshihiro +15 more
doaj +1 more source
Lemaître Class Dark Energy Model for Relaxing Cosmological Constant
Universe, 2017 Cosmological constant corresponds to the maximally symmetric cosmological term with the equation of state p = − ρ . Introducing a cosmological term with the reduced symmetry, p r = − ρ in the spherically symmetric case, makes ...
Irina Dymnikova +2 more
doaj +1 more source
Strong Constraints on Cosmological Gravity from GW170817 and GRB 170817A. [PDF]
Physical Review Letters, 2017 The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational-wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity.
T. Baker +5 more
semanticscholar +1 more source
Transient Antiskyrmion‐Mediated Topological Transitions in Isotropic Magnets
Advanced Science, EarlyView.A transient antiskyrmion‐mediated pathway that drives repeated stripe‐to‐skyrmion transitions is revealed, producing a net increase in topological charge in isotropic Dzyaloshinskii–Moriya interaction films. Experiments and simulations identify the antiskyrmion as a metastable excitation, enabling stochastic bitstream generation for probabilistic ...
Bingqian Dai +18 more
wiley +1 more source