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We study whether the approach of Deffayet et al. (DPSV) can be adopted for obtaining a derivative part of quadratic action for scalar perturbations in beyond Horndeski theories about homogeneous and isotropic backgrounds. We find that even…

High Energy Physics - Theory · Physics 2018-10-18 S. Mironov , V. Volkova

We compute the first order correction in $\hbar $ to the field dependent wave function in Statistical Field Theory. These corrections are evaluated by several usual methods. We limit ourselves to a one dimensional model in order to avoid…

Quantum Physics · Physics 2007-05-23 Pierre Gosselin , Herve Mohrbach , Alain Berard

A new approach of implementing initial and boundary conditions for the lattice Boltzmann method is presented. The new approach is based on an extended collision operator that uses the gradients of the fluid velocity. The numerical…

comp-gas · Physics 2009-10-22 P. A. Skordos

In this paper we introduce new characterizations of spectral fractional Laplacian to incorporate nonhomogeneous Dirichlet and Neumann boundary conditions. The classical cases with homogeneous boundary conditions arise as a special case. We…

Numerical Analysis · Mathematics 2017-09-12 Harbir Antil , Johannes Pfefferer , Sergejs Rogovs

Let $\phi(z)$ be a non-isotrivial rational function in one-variable with coefficients in $\overline{\mathbb{F}}_p(t)$ and assume that $\gamma\in\mathbb{P}^1(\overline{\mathbb{F}}_p(t))$ is not a post-critical point for $\phi$. Then we prove…

Number Theory · Mathematics 2022-09-20 Wade Hindes

Redshift-space distortions are generally considered in the plane parallel limit, where the angular separation between the two sources can be neglected. Given that galaxy catalogues now cover large fractions of the sky, it becomes necessary…

Cosmology and Nongalactic Astrophysics · Physics 2016-02-26 Paulo H. F. Reimberg , Francis Bernardeau , Cyril Pitrou

We derive relationships between the shape deformation of an impenetrable obstacle and boundary measurements of scattering fields on the perturbed shape itself. Our derivation is rigourous by using systematic way, based on layer potential…

Analysis of PDEs · Mathematics 2020-07-23 Habib Zribi

New error bounds for the linear complementarity problems are given respectively when the involved matrices are Nekrasov matrices and B-Nekrasov matrices. Numerical examples are given to show that new bounds are better respectively than…

Numerical Analysis · Mathematics 2016-07-20 Chaoqian Li , Pingfan Dai , Yaotang Li

The Stokes equations subject to non-homogeneous slip boundary conditions are considered in a smooth domain $\Omega \subset \mathbb R^N \, (N=2,3)$. We propose a finite element scheme based on the nonconforming P1/P0 approximation…

Numerical Analysis · Mathematics 2018-09-26 Takahito Kashiwabara , Issei Oikawa , Guanyu Zhou

We adapt Schaback's error doubling trick [R. Schaback. Improved error bounds for scattered data interpolation by radial basis functions. Math. Comp., 68(225):201--216, 1999.] to give error estimates for radial interpolation of functions…

Numerical Analysis · Mathematics 2007-12-02 R. A. Brownlee , E. H. Georgoulis , J. Levesley

Uniqueness and reconstruction in the three-dimensional Calder\'on inverse conductivity problem can be reduced to the study of the inverse boundary problem for Schr\"odinger operators $-\Delta +q $. We study the Born approximation of $q$ in…

Analysis of PDEs · Mathematics 2024-02-05 Juan A. Barceló , Carlos Castro , Fabricio Macià , Cristóbal J. Meroño

We propose a new way to implement Dirichlet boundary conditions for complex shapes using data from a single node only, in the context of the lattice Boltzmann method. The resulting novel method exhibits second-order convergence for the…

Computational Physics · Physics 2021-05-26 Francesco Marson , Yann Thorimbert , Jonas Latt , Bastien Chopard

When comparing experimental results with theoretical predictions of the Casimir force, the accuracy of the theory is as important as the precision of experiments. Here we evaluate the Casimir force when finite conductivity of the reflectors…

Quantum Physics · Physics 2009-11-07 Cyriaque Genet , Astrid Lambrecht , Serge Reynaud

For a second-order strongly elliptic differential operator on an exterior domain in R^n it is known from works of Birman and Solomiak that a change of the boundary condition from the Dirichlet condition to an elliptic Neumann or Robin…

Analysis of PDEs · Mathematics 2011-03-02 Gerd Grubb

This erratum aims to correct 1) the wrong expressions, 2) some typographical errors, 3) some erroneous points made in discussion of the disparity of heat flux ratios between our full RPA model and the local conductivity model, and 4) the…

Mesoscale and Nanoscale Physics · Physics 2021-03-31 Jia-Huei Jiang , Jian-Sheng Wang

We reconsider four-dimensional scalar field theory in presence of Robin boundary conditions on two parallel plates. These boundary conditions are directly imposed in the path integral definition of the theory via auxiliary fields living on…

High Energy Physics - Theory · Physics 2024-09-12 David Dudal , Aaron Gobeyn , Bruno W. Mintz , Thomas Oosthuyse , Sebbe Stouten

In this paper we introduce conformally covariant boundary operators for Poincar\'e-Einstein manifolds satisfying a mild spectral assumption. Using these boundary operators we set up higher order Dirichlet problems whose solutions are such…

Differential Geometry · Mathematics 2023-11-17 Joshua Flynn , Guozhen Lu , Qiaohua Yang

This study revisits the problem of identifying the unknown interior Robin boundary of a connected domain using Cauchy data from the exterior region of a harmonic function. It investigates two shape optimization reformulations employing…

Numerical Analysis · Mathematics 2024-04-09 Lekbir Afraites , Julius Fergy Tiongson Rabago

In this work, we test for gravitational parity violation in the PSR J1141-6545 system by analyzing the orbital plane inclination precession induced by the misalignment between the white dwarf's spin axis and the system's total angular…

General Relativity and Quantum Cosmology · Physics 2025-11-18 Jin Qiao , Qing-Guo Huang , Tao Zhu , Wen Zhao

This paper studies the third boundary problem of the Laplace equation with azimuthal symmetry.Many solutions of the boundary value problems in spherical coordinates are available in the form of infinite series of Legendre polynomials but…

Mathematical Physics · Physics 2015-10-23 Stephane Mottin
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