Tags » Mathematical Physics

Geometric dark energy traversable wormholes constrained by astrophysical observations [CL]


In this letter, we introduce the astrophysical observations into the wormhole research, which is not meant to general parameters constraints for the dark energy models, in order to understand more about in which stage of the universe evolutions wormholes may exist through the investigation of the evolution behavior of the cosmic equation of state parameter. 216 more words

Cosmology And Nongalactic Astrophysics

Concomitant Hamiltonian and topological structures of extended magnetohydrodynamics [CL]


The paper describes the unique geometric properties of ideal magnetohydrodynamics (MHD), and demonstrates how such features are inherited by extended MHD models, which incorporate two-fluid effects. 101 more words


Causal Nature and Dynamics of Trapping Horizons in Black Hole Collapse and Cosmology [CL]


In calculations of gravitational collapse to form black holes, trapping horizons (foliated by marginally trapped surfaces) make their first appearance either within the collapsing matter or where it joins on to a vacuum exterior. 268 more words

Cosmology And Nongalactic Astrophysics

Journal of Physics A: out and about

Conferences are a fantastic opportunity for our editors to engage with the community and hear about leading research first hand. We will be attending several conferences this year, confirmed so far are: 147 more words

Journal Of Physics A: Mathematical And Theoretical

On the astrodynamics applications of Weierstrass elliptic and related functions [EPA]


Weierstrass elliptic and related functions have been recently shown to enable analytical explicit solutions to classical problems in astrodynamics. These include the constant radial acceleration problem, the Stark problem and the two-fixed center (or Euler’s) problem. 77 more words

Earth And Planetary Astrophysics

Evolution and Dynamics of a Matter creation model [CL]


In the flat Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) geometry, we consider the expansion of the universe powered by the gravitationally induced `adiabatic’ matter creation. To demonstrate how matter creation works well with the expanding universe, we have considered a general creation rate and analyzed this rate in the framework of dynamical analysis. 211 more words

Cosmology And Nongalactic Astrophysics

deriving number from observation of the physical universe

there is a single ‘sum total of everything which exists’

any multiverses exist only as subdivisions of the sum total

so we will¬†call the single, sum total of everything which exists ‘Existence’, capitalised to indicate its status… 124 more words

Number Theory