Results 71 to 80 of about 1,372,703 (368)
FEBS Open Bio, EarlyView.The contrast transfer function (CTF) is an imaging aberration that is a major resolution‐limiting factor in cryo‐electron microscopy (cryo‐EM). Precise CTF estimation is key to overcoming this limitation, but is particularly challenging in cryo‐electron tomography (cryo‐ET) data. Here, we present an approach for using geometric information to assist in
Sagar Khavnekar, William Wan
wiley +1 more source
Symmetries of String Effective Action and Space-Time Geometry [PDF]
, 1992 Two dimensional charged black hole solution is obtained by implementing an $O(2,2)$ transformation on the three dimensional black string solution. Two different monopole backgrounds in five dimensions are related through an $O(2,2)$ transformation.
Khastgir, S. Pratik, Maharana, Jnanadeva
core +2 more sources
MHV amplitudes and BCFW recursion for Yang-Mills theory in the de Sitter static patch
Journal of High Energy Physics, 2021 We study the scattering problem in the static patch of de Sitter space, i.e. the problem of field evolution between the past and future horizons of a de Sitter observer. We formulate the problem in terms of off-shell fields in Poincare coordinates.
Emil Albrychiewicz +2 more
doaj +1 more source
, 2004 Bearing in mind BV quantization of gauge gravitation theory, we extend general covariant transformations to the BRST ones.
Bashkirov, D., Sardanashvily, G.
openaire +2 more sources
Incorporation of space–time symmetries in Einstein’s field equations [PDF]
, 1997 In the search for exact solutions to Einstein’s field equations the main simplification tool is the introduction of space–time symmetries. Motivated by this fact, we develop a method to write the field equations for general matter in a form that fully ...
E. Zafiris
semanticscholar +1 more source
Multi‐institutional study on image quality for a novel CBCT solution on O‐ring linac
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Introduction This work presents a multi‐institutional study on image quality provided by a novel cone beam computed tomography (CBCT). The main goal is to investigate the consistency of imaging performance across multiple institutions.
Luis Agulles‐Pedrós +11 more
wiley +1 more source
New Superstring Isometries and Hidden Dimensions
, 2007 We explore the hierarchy of hidden space-time symmetries of noncritical strings in RNS formalism, realized nonlinearly. Under these symmetry transformations the variation of the matter part of the RNS action is cancelled by that of the ghost part.
Polyakov, Dimitri
core +2 more sources
The Information Metric on the moduli space of instantons with global symmetries [PDF]
, 2015 In this note we revisit Hitchin's prescription \cite{Hitchin} of the Fisher metric as a natural measure on the moduli space of instantons that encodes the space-time symmetries of a classical field theory.
Malek, Emanuel +2 more
core +3 more sources
Non-expanding horizons: multipoles and the symmetry group
Journal of High Energy Physics, 2022 It is well-known that blackhole and cosmological horizons in equilibrium situations are well-modeled by non expanding horizons (NEHs) [1–3]. In the first part of the paper we introduce multipole moments to characterize their geometry, removing the ...
Abhay Ashtekar +3 more
doaj +1 more source
SPACE-TIME SYMMETRIES AND SEMICLASSICAL AMPLITUDES [PDF]
, 1993 We examine the space-time symmetries of forward 2→2 scattering. These symmetries have non-trivial consequences for any class of configurations which might dominate the amplitude in the semiclassical approximation.
Thomas M. Gould, S. Hsu
semanticscholar +1 more source