Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Wesley, Daniel H."'
Publikováno v:
J. High Energ. Phys. 91 (2020)
Perhaps the greatest challenge for fundamental theories based on compactification from extra dimensions is accommodating a period of accelerated cosmological expansion. Previous studies have identified constraints imposed by the existence of dark ene
Externí odkaz:
http://arxiv.org/abs/2005.01143
Publikováno v:
Phys. Rev. D 87, 044025 (2013)
We compute the scalar gravitational radiation from a binary pulsar system in the simplest model that exhibits the Vainshtein mechanism. The mechanism is successful in screening the effect from scalar fields conformally coupled to matter, although gra
Externí odkaz:
http://arxiv.org/abs/1208.0580
Publikováno v:
JHEP 0809:052,2008
We present a systematic study of the cosmological billiard structures of Einstein-p-form systems in which all spatial directions are compactified on a manifold of nontrivial topology. This is achieved for all maximally oxidised theories associated wi
Externí odkaz:
http://arxiv.org/abs/0805.3793
Autor:
Mack, Katherine J., Wesley, Daniel H.
We consider the signatures of a population of primordial black holes (PBHs) in future observations of 21cm radiation from neutral hydrogen at high redshift. We focus on PBHs in the mass range $5 \times 10^{10} kg \lesssim M_{PBH} \lesssim 10^{14} kg$
Externí odkaz:
http://arxiv.org/abs/0805.1531
Autor:
Wesley, Daniel H.
Publikováno v:
JCAP 0901:041,2009
We give detailed proofs of several new no-go theorems for constructing flat four-dimensional accelerating universes from warped dimensional reduction. These new theorems improve upon previous ones by weakening the energy conditions, by including time
Externí odkaz:
http://arxiv.org/abs/0802.3214
Autor:
Wesley, Daniel H.
We describe new no-go theorems for producing four-dimensional accelerating universes from warped dimensional reduction. The new theorems improve upon previous results by including dynamical extra dimensions and by treating four-dimensional universes
Externí odkaz:
http://arxiv.org/abs/0802.2106
Publikováno v:
JCAP0802:001,2008
Large-scale coherent magnetic fields are observed in galaxies and clusters, but their ultimate origin remains a mystery. We reconsider the prospects for primordial magnetogenesis by a cosmic string network. We show that the magnetic flux produced by
Externí odkaz:
http://arxiv.org/abs/0708.2901
Autor:
Tolley, Andrew J., Wesley, Daniel H.
Publikováno v:
JCAP 0705:006,2007
We study cosmological perturbations produced by the most general two-derivative actions involving two scalar fields, coupled to Einstein gravity, with an arbitrary field space metric, that admit scaling solutions. For contracting universes, we show t
Externí odkaz:
http://arxiv.org/abs/hep-th/0703101
Publikováno v:
Phys.Rev.D76:123515,2007
We show that the existence of cosmic strings can be strongly constrained by the next generation of gravitational lensing surveys at radio frequencies. We focus on cosmic string loops, which simulations suggest would be far more numerous than long (ho
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702648
Autor:
Wesley, Daniel H.
Publikováno v:
Class.Quant.Grav.24:F7-F13,2007
Compactification can control chaotic Mixmaster behavior in gravitational systems with p-form matter: we consider this in light of the connection between supergravity models and Kac-Moody algebras. We show that different compactifications define "muta
Externí odkaz:
http://arxiv.org/abs/hep-th/0610322