Results 91 to 100 of about 1,549,437 (171)
The Space of Connections as the Arena for (Quantum) Gravity
Symmetry, Integrability and Geometry: Methods and Applications, 2011 We review some properties of the space of connections as the natural arena for canonical (quantum) gravity, and compare to the case of the superspace of 3-metrics.
Steffen Gielen
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Vestigial Plastids in Parasitic Plants: Evolutionary Remnants or Adaptive Innovations?
Plant, Cell &Environment, Volume 49, Issue 8, Page 5401-5420, August 2026.ABSTRACT Throughout the evolutionary history of plants, chloroplasts originating from a cyanobacterial endosymbiosis have undergone remarkable adaptation and specialization, giving rise to a multitude of plastid types. The evolution toward parasitism in plants represents a particularly extreme case of such specialization.
Laia Jené, Sergi Munné‐Bosch
wiley +1 more source
Structure and Activity of Class II Lanthipeptides From a Thermophilic Bacterium
ChemBioChem, Volume 27, Issue 13, 14 July 2026.Heterologous coexpression of the lanthipeptide synthetase TlaM from the thermophilic bacterium Thermoactinomyces sp. DSM 45891, with the precursor peptides TlaA1 and TlaA2 in Escherichia coli, resulted in the introduction of four thioether rings in both peptides.
Enleyona Weir +2 more
wiley +1 more source
Quantum-Wave Equation and Heisenberg Inequalities of Covariant Quantum Gravity
Entropy, 2017 Key aspects of the manifestly-covariant theory of quantum gravity (Cremaschini and Tessarotto 2015–2017) are investigated. These refer, first, to the establishment of the four-scalar, manifestly-covariant evolution quantum wave equation, denoted as ...
Claudio Cremaschini, Massimo Tessarotto
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Medical Physics, Volume 53, Issue 7, July 2026.Abstract Background Carbon ion radiotherapy (CIRT) in the upright posture is a treatment technique which delivers carbon ion beams from a fixed direction to patients who sit or stand on a rotating chair. Although various potential advantages of the upright positioning have been discussed, feasibility of upright CIRT for prostate cancer has not been ...
Yusuke Nomura +13 more
wiley +1 more source
, 2013 How should one understand the implications of general covariance for the role of time in classical theories of gravity? On one popular view, the essential lesson is that change is relational in a strong sense, such that all it is for a physical degree of
Thebault, Karim P Y, Gryb, Sean
core
Learning about Quantum Gravity with a Couple of Nodes
Symmetry, Integrability and Geometry: Methods and Applications, 2012 Loop Quantum Gravity provides a natural truncation of the infinite degrees of freedom of gravity, obtained by studying the theory on a given finite graph. We review this procedure and we present the construction of the canonical theory on a simple graph,
Enrique F. Borja +2 more
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Towards (3+1) gravity through Drinfel'd doubles with cosmological constant
Physics Letters B, 2015 We present the generalisation to (3+1) dimensions of a quantum deformation of the (2+1) (Anti)-de Sitter and Poincaré Lie algebras that is compatible with the conditions imposed by the Chern–Simons formulation of (2+1) gravity.
Angel Ballesteros +2 more
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A New Spin on the Hole Argument [PDF]
, 2004 This brief paper shows how an exact analogue of Einstein's original hole argument can be constructed in the loop representation of quantum gravity.
Rickles, Dean
core
A Lorentz-Covariant Connection for Canonical Gravity
Symmetry, Integrability and Geometry: Methods and Applications, 2011 We construct a Lorentz-covariant connection in the context of first order canonical gravity with non-vanishing Barbero-Immirzi parameter. To do so, we start with the phase space formulation derived from the canonical analysis of the Holst action in which
Marc Geiller +3 more
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