Results 91 to 100 of about 24,685 (268)
The dynamics of cosmological scenarios inspired by quantum gravity
, 2006 PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core
Modified-gravity wormholes without exotic matter
, 2020 A fundamental ingredient in wormhole physics is the flaring-out condition at the throat which, in classical general relativity, entails the violation of the null energy condition.
Lobo F., Mak M., Harko T., Sushkov S.
core
Compact Stars Admitting Noether Symmetries in Energy-Momentum Squared Gravity
, 2021 This paper investigates the geometry of compact stellar objects through the Noether symmetry approach in the energy-momentum squared gravity. This newly developed theory overcomes the problems of big bang singularity and provides the viable cosmological ...
M. Zeeshan Gul, M. Sharif
core +1 more source
Advanced Materials, EarlyView.Stacked nanoflake assembly (SNA) membranes can oscillate autonomously, offering opportunities for soft actuation and energy harvesting. This work uncovers the physical mechanism behind the sustained oscillation of SNA membranes in gradient humidity and identifies three governing dimensionless parameters, enabling rational design for optimizing SNA ...
Zijing Zhang +5 more
wiley +1 more source
Scalar Mode Quadrupole Radiation from Astronomical Sources in $F(R)$ Modified Gravity
, 2023 We investigate the scalar mode quadrupole radiation of gravitational waves in $F(R)$ modified gravity. In $F(R)$ gravity a massive scalar mode appears in the gravitational waves.
Inagaki, Tomohiro, Taniguchi, Masahiko
core +1 more source
Kohler-Chao interior solutions for compact stellar objects in f(R, G) gravity
Nuclear Physics BIn this work, we investigate the internal structure and physical features of compact stars in the background of modified gravity, specifically within f(R, G) gravity, where R represents the Ricci scalar and G denotes the Gauss–Bonnet invariant.
Ahdab K. Althukair +2 more
doaj +1 more source
Advanced Materials, EarlyView.A titania‐supported Co1/Ru single‐atom alloy catalyst enables efficient polypropylene hydrogenolysis. Ru─Co─Ru motifs maintain Ru activity while suppressing excessive chain scission to gaseous products. Both virgin and waste plastics achieve high, environmentally and economically optimal C11+ liquid yields, supporting sustainable chemical recycling ...
Yuzhen Ge +6 more
wiley +1 more source
On the stability conditions for theories of modified gravity in the presence of matter fields
, 2017 International audienceWe present a thorough stability analysis of modified gravity theories in the presence of matter fields. We use the Effective Field Theory framework for Dark Energy and Modified Gravity to retain a general approach for the gravity ...
De Felice, A. +8 more
core +1 more source
FLRW Cosmological Models with Dynamic Cosmological Term in Modified Gravity
, 2021 Although the standard lambda cold dark matter cosmological model is quite successful in describing the universe, there are still several issues that are still not resolved.
Rishi Kumar Tiwari +2 more
core +1 more source
Advanced Materials, EarlyView.A hierarchical hydrogel evaporator with a thin, porous photothermal layer of fused core–shell carbon‐polymer nanospheres enables ultrafast interfacial solar evaporation with minimized heat loss and sufficient water supply. Directional advection‐dominated brine transport, coupled with Marangoni‐driven interfacial flow, drives salt away from the active ...
Haokun Shen +11 more
wiley +1 more source