Zobrazeno 1 - 10
of 10 211
pro vyhledávání: '"McDonald, J"'
Autor:
McDonald, J. I., Witte, S. J.
Ray tracing plays a vital role in black hole imaging, modeling the emission mechanisms of pulsars, and deriving signatures from physics beyond the Standard Model. In this work we focus on one specific application of ray tracing, namely, predicting ra
Externí odkaz:
http://arxiv.org/abs/2309.08655
Publikováno v:
JCAP12(2023)031
With axions now a primary candidate for dark matter, understanding their indirect astrophysical signatures is of paramount importance. Key to this is the production of photons from axions in magnetised astrophysical plasmas. While simple formulae for
Externí odkaz:
http://arxiv.org/abs/2307.11812
Autor:
McDonald, J.
Higgs Inflation via the unmodified metastable Standard Model Higgs Potential is possible if the effective Planck mass in the Jordan frame increases after inflation ends. Here we consider the predictions of this model independently of the dynamics res
Externí odkaz:
http://arxiv.org/abs/2305.16208
Autor:
Battye, R. A., Keith, M. J., McDonald, J. I., Srinivasan, S., Stappers, B. W., Weltevrede, P.
Axion dark matter can be converted into photons in the magnetospheres of neutron stars leading to a spectral line centred on the Compton wavelength of the axion. Due to the rotation of the star and the plasma effects in the magnetosphere the signal i
Externí odkaz:
http://arxiv.org/abs/2303.11792
We present the Versatile Grasp Quality Convolutional Neural Network (VGQ-CNN), a grasp quality prediction network for 6-DOF grasps. VGQ-CNN can be used when evaluating grasps for objects seen from a wide range of camera poses or mobile robots without
Externí odkaz:
http://arxiv.org/abs/2203.04874
Autor:
Lloyd-Stubbs, A. K., McDonald, J.
Publikováno v:
Phys.Rev.D 105 (2022), 103532
We demonstrate the existence of Q-balls in non-minimally coupled inflation models with a complex inflaton in the Palatini formulation of gravity. We show that there exist Q-ball solutions which are compatible with inflation and we derive a window in
Externí odkaz:
http://arxiv.org/abs/2112.09121
Autor:
McDonald, J. I.
The hunt for dark matter remains one of the principal objectives of modern physics and cosmology. Searches for dark matter in the form of axions are proposed or underway across a range of experimental collaborations. As we look to the next generation
Externí odkaz:
http://arxiv.org/abs/2108.13894
We apply novel, recently developed plasma ray-tracing techniques to model the propagation of radio photons produced by axion dark matter in neutron star magnetospheres and combine this with both archival and new data for the galactic centre magnetar
Externí odkaz:
http://arxiv.org/abs/2107.01225
Axions are well-motivated candidates for dark matter. Recently, much interest has focused on the detection of photons produced by the resonant conversion of axion dark matter in neutron star magnetospheres. Various groups have begun to obtain radio d
Externí odkaz:
http://arxiv.org/abs/2104.08290
Autor:
McDonald, J.
In the conventional metric formulation of gravity, the Higgs Inflation model violates unitarity in the electroweak vacuum in Higgs scattering at the energy scale $\Lambda \sim M_{Pl}/\xi$, where $\xi \sim 10^4$ is the non-minimal coupling of the Higg
Externí odkaz:
http://arxiv.org/abs/2007.04111