Results 131 to 140 of about 79,313 (303)
Irreversible Geometrothermodynamics of Open Systems in Modified Gravity. [PDF]
Entropy (Basel), 2023 Pinto MAS, Harko T, Lobo FSN.
europepmc +1 more source
Stellar oscillations in modified gravity [PDF]
Physical Review D, 2013 Starting from the equations of modified gravity hydrodynamics, we derive the equ tions of motion governing linear, adiabatic, radial perturbations of stars in scalar-tensor theories. There are two new features: first, the eigenvalue equation for the period of stellar oscillations is modified such that the eigenfrequencies are always larger than ...
openaire +2 more sources
Advanced Materials, EarlyView.Mechanically origami‐coded 3D kirigami photovoltaics convert a single extension–release cycle into deterministic self‐folding, reconfiguring planar solar cells into programmable 3D modules. Distinct coding strategies enable either ultrahigh stretchability (500% system strain) or ultrahigh initial effective areal coverage (225%).
Seok Joon Hwang +15 more
wiley +1 more source
Renormalization group flow of f(R)-gravity
, 2008 We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$.
Afd Theoretical Physics (ITF) +4 more
core
A Comprehensive Analysis of Hyperbolical Fluids in Modified Gravity. [PDF]
Entropy (Basel), 2022 Yousaf Z, Bhatti MZ, Khlopov M, Asad H.
europepmc +1 more source
COSMIC ACCELERATION AND MODIFIED GRAVITY
International Journal of Modern Physics D, 2007 I briefly discuss some attempts to construct a consistent modification to general relativity (GR) that might explain the observed late-time acceleration of the Universe and provide an alternative to dark energy. I describe the issues facing extensions to GR, illustrate these with a specific example, and discuss the resulting observational and ...
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Advanced Materials, EarlyView.We address the inherently weak particle adhesion of conventional air filters by coating a dynamically crosslinked adhesive layer that delivers capillarity‐driven strong adhesion and particle absorption mediated by dynamic bond exchange. The resulting enhancement in particle adhesion enables efficient ultrafast (up to 20 m s−1) and omnidirectional ...
Junyong Park +11 more
wiley +1 more source
Routes towards Emergent Gravity [PDF]
, 2010 We discuss a toy model for an emergent non-relativistic gravitational theory. Within a certain class of Bose-Einstein condensates, it is possible to show that, in a suitable regime, a modified version of non-relativistic Newtonian gravity does ...
Girelli F +10 more
core +1 more source
Nuclear Physics BThis study explores wormhole solutions within two distinct modified gravity theories, namely f(R,T) gravity and f(Q,T) gravity, incorporating Bose-Einstein condensate (BEC) dark matter to analyze their geometric properties.
Chaitra Chooda Chalavadi +2 more
doaj +1 more source
Wave propagation in modified gravity
Physical Review D, 2016 We investigate the propagation of scalar waves induced by matter sources in the context of scalar-tensor theories of gravity which include screening mechanisms for the scalar degree of freedom. The usual approach when studying these theories in the non-linear regime of cosmological perturbations is based on the assumption that scalar waves travel at ...
Lindroos, Jan Ø. +2 more
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