Results 41 to 50 of about 634,467 (244)

Cyclic, ekpyrotic and little rip universe in modified gravity

, 2012
We propose the reconstruction of $F(R)$ gravity in such a way that corresponding theory admits cyclic and ekpyrotic universe solutions. The number of explicit examples of such $F(R)$ model is found.
Nojiri, Shin'ichi, Odintsov, Sergei D., Saez-Gomez, Diego   +2 more
core   +1 more source

Swelling‐Programmed Topographical Guidance for Dynamic Spheroid Self‐Assembly via a Mechanochemical Hydrogel Niche

Advanced Functional Materials, EarlyView.
A swelling‐programmed micropatterned hydrogel guides adherent cells through a controlled transition from cell–matrix anchoring to cadherin‐mediated cell–cell compaction, enabling rapid assembly of high‐viability spheroids with defined size and morphology.
Han Gyeol Nam, Seon Yeong Chae, Young Woo Kwon, Hye Jin Heo, Hye Rin Lee, Ji Hyeok Lee, Dong‐Wook Han, Yun Hak Kim, Suck Won Hong   +8 more
wiley   +1 more source

Viability of Noether symmetry of F(R) theory of gravity

, 2014
Canonization of F(R) theory of gravity to explore Noether symmetry is performed treating R - 6(\frac{\ddot a}{a} + \frac{\dot a^2}{a^2} + \frac{k}{a^2}) = 0 as a constraint of the theory in Robertson-Walker space-time, which implies that R is taken as an
A. Bonanno, A. Lue, A.D. Dolgov, A.H. Chamseddine, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.K. Sanyal, A.W. Brookfield, Abhik Kumar Sanyal, B. Li, B. Li, B. Vakili, B. Vakili, D.N. Vollick, F. M-Hoissen, G. Allemandi, G. Allemandi, G. Cognola, G.T. Horowitz, J.P. Gregory, K. Bamba, Kaushik Sarkar, L. Amendola, M. Borunda, M. Demianski, M. Demianski, M.B. Green, M.D. Pollock, N.J. Poplawski, Nayem Sk, P. Candelas, P. Horava, R. Dick, R. Ritis de, R. Ritis de, R.C. Souza de, R.R. Metsaev, S. Basilakos, S. Capozziellio, S. Capozziellio, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Capozziello, S. Cecotti, S. Deser, S. Fay, S. Kamilya, S. Kamilya, S. Kanno, S. Lee, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Tsujikawa, S.M. Carroll, S.V. Ketov, Subhra Debnath, T. Koivisto, T.P. Sotiriou, X. Meng, X. Meng, Y. Zhang, Y.-S. Song   +83 more
core   +1 more source

Multi‐Scale Interface Engineering of MXenes for Multifunctional Sensory Systems

Advanced Functional Materials, EarlyView.
MXenes, as two‐dimensional transition metal carbides and nitrides, demonstrate remarkable capabilities for multifunctional sensing applications. This review systematically examines multi‐scale interface engineering approaches that enhance sensing performance, enable diverse detection functionalities, and improve system‐level compatibility in MXene ...
Jiaying Liao, Sin‐Yi Pang, Jianhua Hao
wiley   +1 more source

Stellar equilibrium configurations of white dwarfs in the f(R, T) gravity

European Physical Journal C: Particles and Fields, 2017
In this work we investigate the equilibrium configurations of white dwarfs in a modified gravity theory, namely, f(R, T) gravity, for which R and T stand for the Ricci scalar and trace of the energy-momentum tensor, respectively.
G. A. Carvalho, R. V. Lobato, P. H. R. S. Moraes, José D. V. Arbañil, E. Otoniel, R. M. Marinho, M. Malheiro   +6 more
doaj   +1 more source

Constraint propagation equations of the 3+1 decomposition of f(R) gravity

, 2011
Theories of gravity other than general relativity (GR) can explain the observed cosmic acceleration without a cosmological constant. One such class of theories of gravity is f(R). Metric f(R) theories have been proven to be equivalent to Brans-Dicke (BD)
Amanullah R, Amendola L Enqvist K Koivisto T, Arnowitt R, Baumgarte T W, Buchdahl H A, Calabrese Gioel, Capozziello S, Carroll S M, Chandrasekhar S, Chawla S, De Felice A, Duez M D, Duez M D, Faber J A, Ferraro S Schmidt F Wayne H, Foucart F Duez M D Kidder L E Teukolsky S A, Hinder I, Hu W, Ignacy Sawicki, Kokkotas K D, Komatsu E, Kyutoku K Shibata M Taniguchi K, Lanahan-Tremblay N, Maartens R, Motl P M, Pannarale F Tonita A Rezzolla L, Paschalidis V Etienne Z Liu Y T Shapiro S L, Perlmutter S, Rantsiou E, Reid B A, Riess A G, Ruzmaikina T V, Saijo M, Salgado M, Seyyed M H Halataei, Shibata M, Shibata M, Stuart L Shapiro, Vasileios Paschalidis, Weinberg S, Will C M, Yoneda G, York J W, Zhao G-B Baojiu L Koyama K   +43 more
core   +1 more source

The Floor‐Ceiling‐Chip, or 2 × 2D = Pseudo‐3D—Approaching 3D Cell Morphology and Organization between Two Opposing 2D Substrates with Cell‐Adhesive Protein Micropatterns

Advanced Healthcare Materials, EarlyView.
Here, we present a novel 3D cell patterning and culture platform. The “Floor‐Ceiling‐Chip” (FC‐Chip) consists of two opposing track‐etched membranes, creating a pseudo‐3D microenvironment for the cells in between. By providing the membranes with micropatterned cell‐adhesive islands of varying geometries and sizes, the FC‐Chip enables control over cell ...
Urandelger Tuvshindorj, Francesca Giacomini, Esra Güben Kaçmaz, Tim ten Brink, Lorenzo Moroni, Zeinab Tahmasebi Birgani, Clemens van Blitterswijk, Pamela Habibović, Stefan Giselbrecht, Jan de Boer, Roman Truckenmüller   +10 more
wiley   +1 more source

Axially symmetric solutions in Ricci-inverse modified gravity

European Physical Journal C: Particles and Fields
We investigate a family of axial symmetry solution constructed in general relativity (GR) within the framework of Ricci-inverse (RI) gravity theory. In GR, these solutions admitted closed time-like curves at an instant of time from an initial spacelike ...
F. Ahmed, J. C. R. de Souza, A. F. Santos   +2 more
doaj   +1 more source

Emergence of running vacuum energy in f(R, T) gravity : Observational constraints

Physics Letters B
In this work, we present a new analysis for f(R, T) gravity by exploring the energy momentum tensor. We demonstrate that f(R, T) gravity with the form f(R,T)=R+2κ2λT−2Λ is equivalent to Running Vacuum Energy (RVE), which interacts with the components of ...
Ahmed Errahmani, Mounia Magrach, Safae Dahmani, Amine Bouali, Taoufik Ouali   +4 more
doaj   +1 more source

The phase space of k-Essence f(R) gravity theory

Nuclear Physics B, 2020
Among the remaining viable theories that can successfully describe the late-time era is the k-Essence theory and in this work we study in detail the phase space of k-Essence f(R) gravity in vacuum.
V.K. Oikonomou, N. Chatzarakis
doaj   +1 more source