Results 31 to 40 of about 50,863 (244)

Massless and partially massless limits in Quadratic Gravity

Journal of High Energy Physics, 2023
Abstract In the context of perturbative quantum field theory, the addition of quadratic-curvature invariants to the Einstein-Hilbert action makes it possible to achieve strict renormalizability in four dimensions. The additional terms R2 and CμνρσCμνρσ are multiplied by dimensionless coefficients that are related to the masses of ...
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Higher Derivative Gravity and Conformal Gravity from Bimetric and Partially Massless Bimetric Theory [PDF]

Universe, 2015
In this paper, we establish the correspondence between ghost-free bimetric theory and a class of higher derivative gravity actions, including conformal gravity and new massive gravity. We also characterize the relation between the respective equations of motion and classical solutions.
Hassan, S.Fawad, von Strauss, Mikael, Schmidt-May, Angnis   +2 more
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A new property of the electromagnetic/Yang–Mills-conformal gravity system in spherical symmetry

Nuclear Physics B, 2019
We find a new property in W2-conformal gravity in spherical symmetry. We demonstrate that the charge of the electromagnetic field varies with respect to the partial scaling symmetry (conformal transformations in subspaces of a spacetime) in the conformal
Hongsheng Zhang
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Quantization of Lorentzian 3D gravity by partial gauge fixing [PDF]

Classical and Quantum Gravity, 2012
D = 2+1 gravity with a cosmological constant has been shown by Bonzom and Livine to present a Barbero-Immirzi like ambiguity depending on a parameter. We make use of this fact to show that, for positive cosmological constant, the Lorentzian theory can be partially gauge fixed and reduced to an SU(2) Chern-Simons theory. We then review the already known
Barbosa, Rodrigo M. S., Constantinidis, Clisthenis P, Oporto, Zui, Piguet, Olivier   +3 more
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Frequency Domain Analysis of Partial-Tensor Rotating Accelerometer Gravity Gradiometer

Sensors, 2021
The output model of a rotating accelerometer gravity gradiometer (RAGG) established by the inertial dynamics method cannot reflect the change of signal frequency, and calibration sensitivity and self-gradient compensation effect for the RAGG is a very ...
Xuewu Qian, Liye Zhao, Weiming Liu, Jianqiang Sun   +3 more
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Nonlinear partially massless from massive gravity?

Physical Review D, 2013
We show that consistent nonlinear Partially Massless models cannot be obtained starting from "f-g" massive gravity, with "f" the embedding de Sitter space. The obstruction, which is also the source of f-g acausality, is the very same fifth constraint that removes the notorious sixth ghost excitation.
Deser, S., Sandora, M., Waldron, A.
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Uncovering Transcriptional Responses to Fractional Gravity in Arabidopsis Roots

Life, 2021
Although many reports characterize the transcriptional response of Arabidopsis seedlings to microgravity, few investigate the effect of partial or fractional gravity on gene expression.
James Sheppard, Eric S. Land, Tiffany Aurora Toennisson, Colleen J. Doherty, Imara Y. Perera   +4 more
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Evidence for and obstructions to nonlinear partially massless gravity

Physical Review D, 2013
Non-linear partially massless (PM) gravity, if it exists, is a theory of massive gravity in which the graviton has four propagating degrees of freedom. In PM gravity, a scalar gauge symmetry removes one of the five modes of the massive graviton. This symmetry ties the value of the cosmological constant to the mass of the graviton, which in turn can be ...
de Rham, Claudia, Hinterbichler, Kurt, Rosen, Rachel A., Tolley, Andrew J.   +3 more
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Study of micro‐elongated thermoelastic medium loaded with a piezoelectric layer under the influence of gravity using the dual‐phase‐lag model

International Journal of Mechanical System Dynamics, 2023
This paper aims to examine the influence of gravity on a thermoelastic micro‐elongated layer when a piezoelectric layer is above it, utilizing the theory of Lord–Shulman (L–S) and also the model of dual‐phase‐lag (DPL).
Mohamed I. A. Othman, Ebtesam E. M. Eraki, Mohamed F. Ismail   +2 more
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RNAseq Analysis of the Response of Arabidopsis thaliana to Fractional Gravity Under Blue-Light Stimulation During Spaceflight

Frontiers in Plant Science, 2019
Introduction: Traveling to nearby extraterrestrial objects having a reduced gravity level (partial gravity) compared to Earth’s gravity is becoming a realistic objective for space agencies. The use of plants as part of life support systems will require a
Raúl Herranz, Joshua P. Vandenbrink, Joshua P. Vandenbrink, Alicia Villacampa, Aránzazu Manzano, William L. Poehlman, Frank Alex Feltus, John Z. Kiss, Francisco Javier Medina   +8 more
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