Zobrazeno 1 - 10
of 1 562
pro vyhledávání: '"A, Brax"'
Autor:
Smith, Adam, Mylova, Maria, Brax, Philippe, van de Bruck, Carsten, Burgess, C. P., Davis, Anne-Christine
Axio-dilaton models are among the simplest scalar-tensor theories that contain the two-derivative interactions that naturally compete at low energies with the two-derivative inter-actions of General Relativity. Such models are well-motivated as the l
Externí odkaz:
http://arxiv.org/abs/2408.10820
Scalar field theories with a shift symmetry come equipped with the $K$-mouflage (or kinetic screening) mechanism that suppresses the scalar interaction between massive objects below a certain distance, the screening radius. In this work, we study the
Externí odkaz:
http://arxiv.org/abs/2407.08627
Autor:
Brax, P., Vanhove, P.
We consider the single-parameter $\mathcal{R}+ c\mathcal{R}^2$ gravitational action and use constraints from astrophysics and the laboratory to derive a natural relation between the coefficient $c$ and the value of the cosmological constant. We find
Externí odkaz:
http://arxiv.org/abs/2405.08145
Autor:
Brax, Philippe, Brun, Pierre
We study the effects of an oscillating axion field on the pressure between two metallic plates. We consider the situation where a magnetic field parallel to the plates is present and show that the electric field induced by the coupling of the axion t
Externí odkaz:
http://arxiv.org/abs/2404.18710
We consider the phase shift in the gravitational wave signal induced by fast oscillations of scalar dark matter surrounding binary systems, which could be probed by the future experiments LISA and DECIGO. This effect depends on the local matter densi
Externí odkaz:
http://arxiv.org/abs/2402.04819
Autor:
Brax, Philippe, Fichet, Sylvain
Publikováno v:
Physics 2024, 6(2), 544-567
We investigate the quantum forces occurring between the defects and/or boundaries of a conformal field theory (CFT). We propose to model imperfect defects and boundaries as localized relevant double-trace operators that deform the CFT. Our focus is o
Externí odkaz:
http://arxiv.org/abs/2312.02281
We present the first direct constraints on a Degenerate Higher Order Scalar Tensor (DHOST) inflation model using the Planck 2018 Cosmic Microwave Background (CMB) results on non-Gaussianities. We identify that the bispectrum consists of a fixed contr
Externí odkaz:
http://arxiv.org/abs/2311.13819
Scalar-tensor theories with the shift symmetries required by light scalars are well-explored modifications to GR. For these, two-derivative scalar self-interactions usually dominate at low energies and interestingly compete with the two-derivative me
Externí odkaz:
http://arxiv.org/abs/2310.02092
Autor:
Brax, Philippe, Vanhove, Pierre
We consider a scenario where the scalaron of $f({\cal R})$ models is related to the volume modulus of string compactifications leaving only one scalar degree of freedom at low energy. The coefficient of the leading curvature squared contribution to t
Externí odkaz:
http://arxiv.org/abs/2309.12087
We describe a simple technique for generating solutions to the classical field equations for an arbitrary nonlinear sigma-model minimally coupled to gravity. The technique promotes an arbitrary solution to the coupled Einstein/Klein-Gordon field equa
Externí odkaz:
http://arxiv.org/abs/2308.12004