Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Bloomfield, Jolyon K."'
Publikováno v:
Phys. Rev. D 100, 063512 (2019)
We analyze the onset of inflation for a simple single-field model when the system begins with significant inhomogeneities on length-scales shorter than the initial Hubble radius. We incorporate certain nonlinear interactions among the coupled degrees
Externí odkaz:
http://arxiv.org/abs/1906.08651
Chi-squared random fields arise naturally from the study of fluctuations in field theories with SO(n) symmetry. The extrema of chi-squared fields are of particular physical interest. In this paper, we undertake a statistical analysis of the stationar
Externí odkaz:
http://arxiv.org/abs/1810.02078
In 1963, Zel'dovich devised a method to define the mass of a closed Friedmann-Robertson-Walker (FRW) universe, showing that by this definition it is exactly zero. Rounding out this result, we show that the masses of flat and open universes are (unsur
Externí odkaz:
http://arxiv.org/abs/1801.02249
Highly oscillatory integrals, such as those involving Bessel functions, are best evaluated analytically as much as possible, as numerical errors can be difficult to control. We investigate indefinite integrals involving monomials in $x$ multiplying o
Externí odkaz:
http://arxiv.org/abs/1703.06428
Autor:
Bloomfield, Jolyon K., Face, Stephen H. P., Guth, Alan H., Kalia, Saarik, Lam, Casey, Moss, Zander
We investigate the statistics of stationary points in the sum of squares of $N$ Gaussian random fields, which we call a "chi-squared" field. The behavior of such a field at a point is investigated, with particular attention paid to the formation of t
Externí odkaz:
http://arxiv.org/abs/1612.03890
Publikováno v:
Phys. Rev. D 91, 083510 (2015)
Scalar field theories that possess a Vainshtein mechanism are able to dynamically suppress the associated fifth forces in the presence of massive sources through derivative non-linearities. The resulting equations of motion for the scalar are highly
Externí odkaz:
http://arxiv.org/abs/1408.4759
Publikováno v:
Phys. Rev. D 89, 124003 (2014)
Cosmic superstring loops within the galaxy microlens background point sources lying close to the observer-string line of sight. For suitable alignments, multiple paths coexist and the (achromatic) flux enhancement is a factor of two. We explore this
Externí odkaz:
http://arxiv.org/abs/1311.7132
We present a formalism for the numerical implementation of general theories of dark energy, combining the computational simplicity of the equation of state for perturbations approach with the generality of the effective field theory approach. An effe
Externí odkaz:
http://arxiv.org/abs/1310.6033
Publikováno v:
JCAP08(2013)010
We take an Effective Field Theory (EFT) approach to unifying existing proposals for the origin of cosmic acceleration and its connection to cosmological observations. Building on earlier work where EFT methods were used with observations to constrain
Externí odkaz:
http://arxiv.org/abs/1211.7054
Publikováno v:
JCAP 10 (2012) 039
We explore a class of effective field theory models of cosmic acceleration involving a metric and a single scalar field. These models can be obtained by starting with a set of ultralight pseudo-Nambu-Goldstone bosons whose couplings to matter satisfy
Externí odkaz:
http://arxiv.org/abs/1112.0303