Results 91 to 100 of about 22,331 (301)
Conformal and Disformal Structure of 3D Circularly Symmetric Static Metric in f(R) Theory of Gravity
Mehran University Research Journal of Engineering and Technology, 2020 conformal vector fields are treated as generalization of homothetic vector fields while disformal vector fields are defined through disformal transformations which are generalization of conformal transformations, therefore it is important to study ...
Muhammad Ramzan +2 more
doaj +1 more source
Rotating Killing horizons in generic F(R) gravity theories [PDF]
General Relativity and Gravitation, 2016 v2, 14pp; added references, discussions and clarifications, improved presentation; accepted in ...
openaire +2 more sources
Understanding Operando Water Management in Hydroxide‐Exchange‐Membrane Fuel Cells
Advanced Materials Interfaces, EarlyView.Effective water management is vital for high‐performance hydroxide‐exchange‐membrane fuel cells. Using a custom water‐flux station, this study quantifies how membrane thickness, microporous layers, and operating conditions dictate internal water transport.
Catherine M. Weiss +4 more
wiley +1 more source
Constraining f(R) gravity in solar system, cosmology and binary pulsar systems
Physics Letters B, 2018 The f(R) gravity can be cast into the form of a scalar–tensor theory, and scalar degree of freedom can be suppressed in high-density regions by the chameleon mechanism.
Tan Liu, Xing Zhang, Wen Zhao
doaj +1 more source
Advanced Materials Technologies, EarlyView.Liquid metal direct writing is advanced from a technological and fundamental point. Utilizing a kinematic bed, printing on large surfaces with irregularities is enabled. Furthermore, a pressure‐driven flow during printing is discovered that affects the thickness of traces.
Maximilian Krack +15 more
wiley +1 more source
QCD-Scale f(R) Theories: Local and Cosmological Constraints
, 2014 In this Thesis we investigate the phenomenology of two QCD-scale modified gravity models. The first f(R) modified gravity model is the square-root modified model , which is motivated by q-theory. The second f(R) model which is investigated in this Thesis
Alavirad, Hamzeh
core +1 more source
3D Printed Omniphobic Slippery Liquid Infused Porous Surfaces for Low Surface Tension Repellency
Advanced Materials Technologies, EarlyView.A 3D printing strategy fabricates omniphobic slippery liquid‐infused porous structures with lubricant reservoirs and interconnected microchannels. A post‐printing surface treatment modifies the porous surface to ensure compatibility with the infused fluorinated lubricant.
Noa Trink, Shlomo Magdassi
wiley +1 more source
The viability of modified gravity theories
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core
Thermodynamics in f(R,RαβRαβ,ϕ) theory of gravity [PDF]
, 2016 First and second laws of black hole thermodynamics are examined at the apparent horizon of FRW spacetime in f(R,RαβRαβ,ϕ) gravity, where R, RαβRαβ and ϕ are the Ricci invariant, Ricci tensor and the scalar field respectively.
Zubair, M, Bahamonde, S, Kousar, F
core
Cosmology of Horava-Lifshitz f(R) Gravity
, 2011 We discuss the cosmology of recently proposed Hořava–Lifshitz f(R) gravity. In particular, we derive the modified Hubble equation that reduces to the standard HL gravity case in appropriate limit.
Dutta, K. +5 more
core +1 more source