Results 121 to 130 of about 2,706,843 (321)

Scalarization of compact stars in the scalar-Gauss-Bonnet gravity

Journal of High Energy Physics, 2019
We study scalarization of horizonless neutral compact reflecting stars. In our model, the scalar hair can be induced by the coupling of static scalar fields to the Gauss-Bonnet invariant.
Yan Peng
doaj   +1 more source

Ghost-free infinite derivative gravity

Journal of High Energy Physics, 2018
We present the construction of a gravitational action including an infinite series of higher derivative terms. The outcome is a classically consistent completion of a well-studied quadratic curvature theory.
Brage Gording, Angnis Schmidt-May
doaj   +1 more source

Relational Particle Models as Toy Models for Quantum Gravity and Quantum Cosmology [PDF]

AIP Conference Proceedings, 2006
It is argued that substantial portions of both Newtonian particle mechanics and general relativity can be viewed as relational (rather than absolute) theories. I furthermore use the relational particle models as toy models to investigate the problem of time in closed-universe canonical quantum general relativity.
openaire   +3 more sources

Boon and Bane of Local Solid State Chemistry on the Performance of LSM‐Based Solid Oxide Electrolysis Cells

Advanced Energy Materials, EarlyView.
Cation diffusion causes an increase in the catalytically active MIEC region in solid oxide cells. Simultaneously, it leads to the additional formation and growth of secondary structures in the electrolyte, which reduces the oxygen diffusion. Abstract High‐temperature solid oxide cells are highly efficient energy converters.
Hanna Türk, Xuan Quy Tran, Patricia König, Adnan Hammud, Vaibhav Vibhu, Franz‐Philipp Schmidt, Dirk Berger, Sören Selve, Vladimir Roddatis, Daniel Abou‐Ras, Frank Girgsdies, Yu‐Te Chan, Thomas Götsch, Hebatallah Ali, Izaak C. Vinke, L.G.J (Bert) de Haart, Michael Lehmann, Axel Knop‐Gericke, Karsten Reuter, Rüdiger‐A. Eichel, Christoph Scheurer, Thomas Lunkenbein   +21 more
wiley   +1 more source

Gravitational wavefunctions in JT supergravity

Journal of High Energy Physics
We determine explicit expressions for the continuous two-sided gravitational wavefunctions in supersymmetric versions of JT gravity, focusing mainly on N $$ \mathcal{N} $$ = 2 JT supergravity.
Andreas Belaey, Francesca Mariani, Thomas G. Mertens   +2 more
doaj   +1 more source

Memory, Penrose limits and the geometry of gravitational shockwaves and gyratons

Journal of High Energy Physics, 2018
The geometric description of gravitational memory for strong gravitational waves is developed, with particular focus on shockwaves and their spinning analogues, gyratons.
Graham M. Shore
doaj   +1 more source

NEW SPIN FOAM MODELS OF QUANTUM GRAVITY [PDF]

Modern Physics Letters A, 2005
We give a brief and a critical review of the Barret-Crane spin foam models of quantum gravity. Then we describe two new spin foam models which are obtained by direct quantization of General Relativity and do not have some of the drawbacks of the Barret-Crane models.
openaire   +4 more sources

Photocatalytic and Electrochemical Synthesis of Biofuel via Efficient Valorization of Biomass

Advanced Energy Materials, EarlyView.
This review highlights biomass and biofuel traits, exploring photocatalysis and electrocatalysis mechanisms and their synergistic technologies in biofuel production. It analyzes environmental and economic impacts of green catalytic processes, assesses current challenges, and outlines future research directions, condensing complex topics into a focused ...
Dalin Sun, Yan Zhang, Yuyue Zhou, Yingxia Nie, Lin Ban, Deyu Wu, Song Yang, Heng Zhang, Cheng Li, Kai Zhang   +9 more
wiley   +1 more source

Branes in JT (super)gravity from group theory

Journal of High Energy Physics
In this work, we revisit the end-of-the-world (EOW) brane amplitudes in JT gravity from a BF gauge theoretic perspective. Observing and identifying the correct group theoretic ingredient for a closed EOW brane as a discrete series character, we use the ...
Andreas Belaey, Francesca Mariani, Thomas G. Mertens   +2 more
doaj   +1 more source

Local phase space and edge modes for diffeomorphism-invariant theories

Journal of High Energy Physics, 2018
We discuss an approach to characterizing local degrees of freedom of a subregion in diffeomorphism-invariant theories using the extended phase space of Donnelly and Freidel [36].
Antony J. Speranza
doaj   +1 more source