Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David J. Mulryne"'
In this work we examine the small mass limit of black holes, with and without spin, in theories where a scalar field is non-minimally coupled to a Gauss-Bonnet term. First, we provide an analytical example for a theory where a static closed-form solu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8cd3a83f9ce0223c41452200d5690978
http://hdl.handle.net/10773/36555
http://hdl.handle.net/10773/36555
Publikováno v:
Fernandes, P G S, Carrilho, P, Clifton, T & Mulryne, D J 2022, ' The 4D Einstein-Gauss-Bonnet Theory of Gravity: A Review ', Classical and quantum gravity, vol. 39, no. 6, 063001, pp. 1-50 . https://doi.org/10.1088/1361-6382/ac500a
We review the topic of 4D Einstein-Gauss-Bonnet gravity, which has been the subject of considerable interest over the past two years. Our review begins with a general introduction to Lovelock's theorem, and the subject of Gauss-Bonnet terms in the ac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::633161eb54a0043d1e9deee4ab4cfcea
In this work we study static black holes in the regularized 4D Einstein-Gauss-Bonnet theory of gravity; a shift-symmetric scalar-tensor theory that belongs to the Horndeski class. This theory features a simple black hole solution that can be written
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f00e9b409e4aa6683f3807d8d090de69
http://arxiv.org/abs/2107.00046
http://arxiv.org/abs/2107.00046
Publikováno v:
Davies, M W, Carrilho, P & Mulryne, D J 2022, ' Non-Gaussianity in inflationary scenarios for primordial black holes ', Journal of Cosmology and Astroparticle Physics (JCAP), vol. 2022, no. 6, 019, pp. 1-21 . https://doi.org/10.1088/1475-7516/2022/06/019
Working in an idealised framework in which a series of phases of evolution defined by the second slow-roll parameter $\eta$ are matched together, we calculate the reduced bispectrum, $f_{\rm NL}$, for models of inflation with a large peak in their pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::569b77faea02262011a5e470470f6e50
https://doi.org/10.1088/1475-7516/2022/06/019
https://doi.org/10.1088/1475-7516/2022/06/019
We propose a regularization procedure for the novel Einstein-Gauss-Bonnet theory of gravity, which produces a set of field equations that can be written in closed form in four dimensions. Our method consists of introducing a counter term into the act
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c7fb867f11a142f1174a080d203fafa
http://arxiv.org/abs/2004.08362
http://arxiv.org/abs/2004.08362
In this paper we study the observational constraints that can be imposed on the coupling parameter, $\hat \alpha$, of the regularized version of the 4-dimensional Einstein-Gauss-Bonnet theory of gravity. We use the scalar-tensor field equations of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::511515616bfbffbad32b4cd7328ab47c
Publikováno v:
Physical Review D. 100
We consider the steepest rate at which the power spectrum from single field inflation can grow, with the aim of providing a simple explanation for the $k^4$ growth found recently. With this explanation in hand we show that a slightly steeper $k^5 (\l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::214481e755f828077312063268efd527
https://doi.org/10.1103/physrevd.100.103529
https://doi.org/10.1103/physrevd.100.103529
Publikováno v:
Physical Review D. 100
We study the contribution to the primordial curvature perturbation on observational scales generated by the reheating field in massless preheating. To do so we use lattice simulations and a recent extension to the $\delta N$ formalism. The work demon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3654d51987e592260b60fa0ab0350908
https://doi.org/10.1103/physrevd.100.043543
https://doi.org/10.1103/physrevd.100.043543
Publikováno v:
Physical Review D. 98
We revisit the question of how to calculate correlations of the curvature perturbation, $\ensuremath{\zeta}$, using the $\ensuremath{\delta}N$ formalism when one cannot employ a truncated Taylor expansion of $N$. This problem arises when one uses lat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a2bcacef4f8d6ce135eb5cb3891b26a
https://doi.org/10.1103/physrevd.98.043513
https://doi.org/10.1103/physrevd.98.043513
We study multifield inflation in scenarios where the fields are coupled non-minimally to gravity via $\xi_I(\phi^I)^n g^{\mu\nu}R_{\mu\nu}$, where $\xi_I$ are coupling constants, $\phi^I$ the fields driving inflation, $g_{\mu\nu}$ the space-time metr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32b6e90249f186ec6e5a2ca4ae620fc2