Results 51 to 60 of about 50,468 (222)

Comparison of primordial tensor power spectra from the deformed algebra and dressed metric approaches in loop quantum cosmology

, 2015
Loop quantum cosmology tries to capture the main ideas of loop quantum gravity and to apply them to the Universe as a whole. Two main approaches within this framework have been considered to date for the study of cosmological perturbations: the dressed ...
Barrau, A., Bolliet, B., Grain, J., Linsefors, L., Stahl, C.   +4 more
core   +3 more sources

Non-chaotic dynamics in general-relativistic and scalar-tensor cosmology [PDF]

, 2006
In the context of scalar-tensor models of dark energy and inflation, the dynamics of vacuum scalar-tensor cosmology are analysed without specifying the coupling function or the scalar field potential.
Banerjee N, Biswas T Notari A, Brown M G Freese K Kinney W H, Buniy R V, Calzetta E, Catena R, Easther R, Esposito-Farése G, Fakir R, Fakir R, Fakir R, Fang W, Faraoni, Faraoni V, Faraoni V, Faraoni V, Foster S, Fujii Y, Fujii Y, Glendinning P, Guckenheimer J, Gunzig E, Gunzig E, Holden D J, Liddle A R, Liddle A R, Lu H Q, M N Jensen, Matarrese S Baccigalupi C Perrotta F, Nojiri S Odintsov S D, Page D N, Perrotta F Baccigalupi C, S A Theuerkauf, Toporensky A V, Toporensky A V, Tsujikawa S, V Faraoni, Wald R M, Weinberg S, Will C M   +39 more
core   +2 more sources

“Lock and Key”: Binding Behavior of Malachite Green and Functional Nucleic Acids and Their Multidimensional Applications

Small Structures, EarlyView.
The review comprehensively summarizes the binding behaviors and multidimensional applications of malachite green with diverse functional nucleic acids. By integrating structural mechanisms, comparative analysis, and application strategies across eight domains, it provides theoretical guidance and future perspectives for developing intelligent nucleic ...
Keren Chen, Yangzi Zhang, Qian Yang, Longjiao Zhu, Wentao Xu   +4 more
wiley   +1 more source

Aspects of Quantum Theory in General Relativity and Cosmology

, 2020
After a brief introduction to Cosmology some quantum aspects of General Relativity and cosmology are presented. The radial motion of a massive particles in the ergosphere of the Kerr Black Hole is considered. Screening of Hawking radiation and shielding of the Penrose process is examined in the context of the region of negative energy inside the ...
openaire   +2 more sources

The simplicity of physical laws

Noûs, EarlyView.
Abstract Physical laws are strikingly simple, yet there is no a priori reason for them to be so. I propose that nomic realists—Humeans and non‐Humeans—should recognize simplicity as a fundamental epistemic guide for discovering and evaluating candidate physical laws.
Eddy Keming Chen
wiley   +1 more source

Correlation Patterns of Muon Flux With Vertical Atmospheric Profiles: Insights From Monte Carlo Simulations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract The production, attenuation, and absorption of secondary cosmic rays (SCR) are influenced by atmospheric parameters such as air pressure and temperature. To reliably correlate SCR flux measurements with atmospheric ionization driven by energetic particle precipitation, these dependencies must be quantified.
A. Al‐Qaaod, V. Pierrard, A. Winant, U. Stolzenberg, I. Ambrozova, M. Sommer, J. Slegl, J. Solc, A. Gkikoudi, A. G. Georgakilas, A. Papayannis, F. S. Krasniqi   +11 more
wiley   +1 more source

Anomaly-induced effective action and Chern–Simons modification of general relativity

Physics Letters B, 2015
Recently it was shown that the quantum vacuum effects of massless chiral fermion field in curved space–time leads to the parity-violating Pontryagin density term, which appears in the trace anomaly with imaginary coefficient.
Sebastião Mauro, Ilya L. Shapiro
doaj   +1 more source

Bekenstein’s Entropy Bound-Particle Horizon Approach to Avoid the Cosmological Singularity

Entropy, 2020
The cosmological singularity of infinite density, temperature, and spacetime curvature is the classical limit of Friedmann’s general relativity solutions extrapolated to the origin of the standard model of cosmology.
James R. Powell, Rafael Lopez-Mobilia, Richard A. Matzner   +2 more
doaj   +1 more source

Probing time orientability of spacetime

European Physical Journal C: Particles and Fields, 2023
In general relativity, cosmology and quantum field theory, spacetime is assumed to be an orientable manifold endowed with a Lorentz metric that makes it spatially and temporally orientable.
N. A. Lemos, D. Müller, M. J. Rebouças
doaj   +1 more source

Singularity: Raychaudhuri Equation once again [PDF]

, 2007
I first recount Raychaudhuri's deep involvement with the singularity problem in general relativity. I then argue that precisely the same situation has arisen today in loop quantum cosmology as obtained when Raychaudhuri discovered his celebrated equation.
A. A. Penzias, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. K. Raychaudhuri, A. K. Raychaudhuri, A. K. Raychaudhuri, A. K. Raychaudhuri, A. K. Raychaudhuri, A. K. Raychaudhuri, E. Bianchi, E. Livine, E. Ruiz, J. M. M. Senovilla, J. M. M. Senovilla, M. Bojowald, N. Dadhich, N. Dadhich, N. Dadhich, Naresh Dadhich, S. Tsujikawa, S. W. Hawking, T. Padmanabhan   +22 more
core   +3 more sources