Results 51 to 60 of about 8,712 (220)

Casimir wormholes in modified symmetric teleparallel gravity

European Physical Journal C: Particles and Fields, 2022
In recent years there has been a growing interest in the field of Casimir wormhole. In classical general relativity (GR), it is known that the null energy condition (NEC) has to be violated to have a wormhole to be stable.
Zinnat Hassan, Sayantan Ghosh, P. K. Sahoo, Kazuharu Bamba   +3 more
doaj   +1 more source

Now, Again and Again: The Metaphysics of Many Presents

Pacific Philosophical Quarterly, EarlyView.
ABSTRACT This paper discusses whether there can be multiple present moments. After presenting some reasons for thinking that the question is worthwhile, I challenge several objections to its possibility: worries about the exclusivity of tense; the nature of change, tense logic and semantics; and the apparent tension between multiple presents and an ...
Nikk Effingham
wiley   +1 more source

Deflection Angle of Photons through Dark Matter by Black Holes and Wormholes Using Gauss–Bonnet Theorem

Universe, 2019
In this research, we used the Gibbons–Werner method (Gauss–Bonnet theorem) on the optical geometry of a black hole and wormhole, extending the calculation of weak gravitational lensing within the Maxwell’s fish eye-like profile and dark-
Ali Övgün
doaj   +1 more source

A Critical Analysis of Optimization Algorithms for Cultural Heritage Conservation and Management

Engineering Reports, Volume 8, Issue 10, October 2026.
Methodological framework and decision‐support roadmap for optimization algorithms in cultural heritage conservation and management. ABSTRACT Heritage buildings symbolize cultural identity, architectural character, and historical epitome of communities.
Eslam Mohammed Abdelkader, Abobakr Al‐Sakkaf, Moaaz Elkabalawy, Kyrillos Ebrahim, Haytham Elmousalami, Mohammed Algamati, Ghasan Alfalah   +6 more
wiley   +1 more source

WORMHOLES AND CHILD UNIVERSES [PDF]

International Journal of Modern Physics D, 2010
Evidence to the case that classical gravitation provides the clue to make sense out of quantum gravity is presented. The key observation is the existence in classical gravitation of child universe solutions or "almost" solutions, "almost" because of some singularity problems.
openaire   +3 more sources

Superradiant Scattering by Wormholes in Bopp–Podolsky Electrodynamics

Universe
Superradiance is a scattering process in which incident waves are amplified by a scatterer, such as a black hole, leading to the extraction of energy from the system. In this work, we study superradiant scattering within Bopp–Podolsky electrodynamics, an
Diego Augusto Frizo, Cássius Anderson Miquele de Melo, Maurício Richartz   +2 more
doaj   +1 more source

From Core to Field: Pattern Selection in Dissolving Fractures

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract Chemical erosion governs the evolution of fractures across Earth systems, which manifests in three distinct dissolution patterns. However, how the boundaries between these regimes depend on system scale remains an open question, and no predictive theory has successfully linked laboratory observations to field‐scale behaviors. Here we integrate
Kai Li, Ran Hu, Tomasz Szawełło, Zhibing Yang, Yi‐Feng Chen, Piotr Szymczak, Chuang‐Bing Zhou   +6 more
wiley   +1 more source

A review of preferential flow and transport through root channels

Vadose Zone Journal, Volume 25, Issue 5, September/October 2026.
Abstract Preferential flow can contribute up to 80%–90% of the flow and transport in the vadose zone. The root channels are the most prevalent form of preferential pathways. They create an evolving network of preferential pathways and are biogeochemical hotspots due to preferential transport of nutrients and other organics, colonization of bacteria ...
Ishank Agarwal, Richa Ojha, Saumyen Guha
wiley   +1 more source

A method of computation for worst-case delay analysis on SpaceWire networks [PDF]

, 2009
SpaceWire is a standard for on-board satellite networks chosen by the ESA as the basis for future data-handling architectures. However, network designers need tools to ensure that the network is able to deliver critical messages on time. Current research
Frances, Fabrice, Fraboul, Christian, Ferrandiz, Thomas, Fabrice Frances, Thomas Ferrandiz, Christian Fraboul   +5 more
core   +1 more source

Rotation effects on the graphene wormhole energy levels

Nuclear Physics B
In this work, we are interested in how spinning effects influence the electronic properties of the graphene wormhole. For this purpose, we have described the graphene by wormhole background based on the model developed by González and his co-workers.
G.Q. Garcia, P.J. Porfírio, C. Furtado, D.C. Moreira   +3 more
doaj   +1 more source