Results 51 to 60 of about 246,583 (327)

Relativistic Constraints for a Naturalistic Metaphysics of Time [PDF]

, 2012
The traditional metaphysical debate between static and dynamic views in the philosophy of time is examined in light of considerations concerning the nature of time in physical theory.
Evans, Peter W.
core  

Energy and Momentum densities of cosmological models, with equation of state $\rho=\mu$, in general relativity and teleparallel gravity

, 2006
We calculated the energy and momentum densities of stiff fluid solutions, using Einstein, Bergmann-Thomson and Landau-Lifshitz energy-momentum complexes, in both general relativity and teleparallel gravity.
A. Chamorro, A. Chamorro, A. Havare, A. Papapetrou, C. Møller, C. Møller, C.C. Chang, C.W. Misner, E. Verdaguer, E.C. Vagenas, E.C. Vagenas, E.C. Vagenas, E.C. Vagenas, E.C. Vagenas, F.I. Cooperstock, F.I. Cooperstock, F.I. Cooperstock, F.I. Cooperstock, F.I. Cooperstock, H. Bondi, I. Radinschi, J. Wainwright, J.M. Aguirregabiria, K. Hayashi, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, K.S. Virbhadra, L.D. Landau, M. Salti, M. Salti, O. Aydogdu, P.G. Bergmann, R. Weitzenböck, R.C. Tolman, R.M. Gad, R.M. Gad, R.M. Gad, R.M. Gad, R.M. Gad, R.M. Gad, R.T. Hammond, Ragab M. Gad, S. Weinberg, S.S. Xulu, S.S. Xulu, S.S. Xulu, T. Bringley, T. Vargas, V.C. Andrade de, V.C. Andrade de   +54 more
core   +1 more source

Lectures on faster-than-light travel and time travel

SciPost Physics Lecture Notes, 2019
These lecture notes were prepared for a 25-hour course for advanced undergraduate students participating in Perimeter Institute's Undergraduate Summer Program.
Barak Shoshany
doaj   +1 more source

Why special relativity should not be a template for a fundamental reformulation of quantum mechanics [PDF]

, 2005
In a comparison of the principles of special relativity and of quantum mechanics, the former theory is marked by its relative economy and apparent explanatory simplicity. A number of theorists have thus been led to search for a small number of postulates
Brown, Harvey R., Timpson, Christopher G.   +1 more
core   +1 more source

The existence of superluminal particles is consistent with the kinematics of Einstein's special theory of relativity

, 2013
Within an axiomatic framework of kinematics, we prove that the existence of faster than light particles is logically independent of Einstein's special theory of relativity.
Andréka, Andréka, Andréka, Andréka, Andréka, Andréka, Arntzenius, Bilaniuk, Chang, Chashchina, Einstein, Enderton, Friedman, Fröman, Galilei, Gergely Székely, Geroch, Jentschura, Jentschura, Lossev, Madarász, Madarász, Madarász, Madarász, Matolcsi, Mittelstaedt, Mészáros, Mészáros, Nikolić, Recami, Recami, Recami, Recami, Recami, Selleri, Székely, Taylor, Tolman, Weinstein, Zamboni-Rached   +39 more
core   +1 more source

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

A física clássica de cabeça para baixo: como Einstein descobriu a teoria da relatividade especial

Revista Brasileira de Ensino de Física
Albert Einstein por duas vezes alterou de maneira profunda nossos conceitos de espaço e tempo com a sua teoria da relatividade: primeiro no âmbito da teoria especial de 1905 e depois com a teoria geral de 1915.
Jürgen Renn
doaj   +1 more source

Numerical Relativity as a New Tool for Fundamental Cosmology

Physics, 2022
Advances in our understanding of the origin, evolution, and structure of the universe have long been driven by cosmological perturbation theory, model building, and effective field theory.
Anna Ijjas
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source