Results 11 to 20 of about 257,618 (243)

Ab initio studies on the lattice thermal conductivity of silicon clathrate frameworks II and VIII [PDF]

Phys. Rev. B 93, 024307 (2016), 2015
The lattice thermal conductivities of silicon clathrate frameworks II and VIII are investigated by using ab initio lattice dynamics and iterative solution of the linearized Boltzmann transport equation(BTE) for phonons. Within the temperature range 100-350 K, the clathrate structures II and VIII were found to have lower lattice thermal conductivity ...
arxiv   +1 more source

Galaxy cluster photons alter the ionisation state of the nearby warm-hot intergalactic medium [PDF]

, 2022
The physical properties of the faint and extremely tenuous plasma in the far outskirts of galaxy clusters, the circumgalactic media of normal galaxies, and filaments of the cosmic web, remain one of the biggest unknowns in our story of large-scale structure evolution. Modelling the spectral features due to emission and absorption from this very diffuse
arxiv   +1 more source

Nonequilibrium Response and Frenesy [PDF]

Journal of Physics: Conference Series 638, 012001 (2015), 2015
We present examples of how time-symmetric kinetic factors contribute to the response either in nonlinear order around equilibrium or in linear order around nonequilibrium. The phenomenology we associate to that so called frenetic contribution are negative differential conductivity, changes in the Einstein relation between friction and noise, and ...
arxiv   +1 more source

Scale Factor Dualities in Anisotropic Cosmologies [PDF]

Class.Quant.Grav. 15 (1998) 257-272, 1998
The concept of scale factor duality is considered within the context of the spatially homogeneous, vacuum Brans-Dicke cosmologies. In the Bianchi class A, it is found that duality symmetries exist for the types I, II, VI_0, VII_0, but not for types VIII and IX.
arxiv   +1 more source

Modeling of geocoronal solar wind charge exchange events detected with Suzaku [PDF]

, 2022
A model of geocoronal solar wind charge exchange (SWCX) emission was built and compared to five Suzaku detections of bright geocoronal SWCX events. An exospheric neutral hydrogen distribution model, charge exchange cross sections, solar wind ion data taken with the ACE and WIND satellites, and magnetic field models of the Earth's magnetosphere are all ...
arxiv   +1 more source

Where Are the Baryons? III: Non-Equilibrium Effects and Observables [PDF]

Astrophys.J.650:573-591,2006, 2005
Numerical simulations of the intergalactic medium have shown that at the present epoch a significant fraction (40-50%) of the baryonic component should be found in the (T~10^6K) Warm-Hot Intergalactic Medium (WHIM) - with several recent observational lines of evidence indicating the validity of the prediction.
arxiv   +1 more source

Self-ionizing galactic winds [PDF]

, 2022
We present hydrodynamical simulations of galactic winds from star-forming galaxies including non-equilibrium ionization and frequency-dependent radiative transfer, processes that have remained largely unaccounted for in galactic wind studies. We consider radiation from massive stars, the metagalactic UV/X-ray background, and the self-radiation of the ...
arxiv   +1 more source

Highly Ionized Collimated Outflow from HE 0238 - 1904 [PDF]

, 2012
We present a detailed analysis of a highly ionized, multiphased and collimated outflowing gas detected through O V, O VI, Ne VIII and Mg X absorption associated with the QSO HE 0238 - 1904 (z_em ~ 0.629). Based on the similarities in the absorption line profiles and estimated covering fractions, we find that the O VI and Ne VIII absorption trace the ...
arxiv   +1 more source

Scale-factor duality in string Bianchi cosmologies [PDF]

Int.J.Mod.Phys. D8 (1999) 349-361, 1999
We apply the scale factor duality transformations introduced in the context of the effective string theory to the anisotropic Bianchi-type models. We find dual models for all the Bianchi-types [except for types $VIII$ and $IX$] and construct for each of them its explicit form starting from the exact original solution of the field equations.
arxiv   +1 more source

Cosmic Origins Spectrograph Observations of Warm Intervening Gas Towards 3C263 [PDF]

, 2012
We present HST/COS high S/N observations of the z = 0.32566 multi-phase absorber towards 3C263. The COS data shows absorption from H I, O VI, C III, N III, Si III and C II. The Ne VIII in this absorber is detected in the FUSE spectrum. The low and intermediate ions are kinematically aligned with each other and H I and display narrow line widths of 6 km/
arxiv   +1 more source