Open Access. Powered by Scholars. Published by Universities.®
Cosmology, Relativity, and Gravity Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Approximations (1)
- Astrophysics (1)
- Coherent production (1)
- Configuration (1)
- Cosmological models (1)
-
- Cosmology and nongalactic astrophysics (1)
- Differential equations (1)
- Energy density (1)
- Energy levels (1)
- Equations (1)
- Excited states (1)
- Field equations (1)
- Inflationary universe (1)
- Interactions (1)
- Klein-gordon equation (1)
- Lifetime (1)
- Mathematical models (1)
- Mathematical space (1)
- Minkowski space (1)
- Nonlinear problems (1)
- Partial differential equations (1)
- Particle interactions (1)
- Particle production (1)
- Physics of elementary particles and fields (1)
- Scalar fields (1)
- Space (1)
- Space-time calculation methods (1)
- Wave equations (1)
Articles 1 - 2 of 2
Full-Text Articles in Cosmology, Relativity, and Gravity
Correlation Of Inflation-Produced Magnetic Fields With Scalar Fluctuations, Robert R. Caldwell, Leonardo Motta, Marc Kamionkowski
Correlation Of Inflation-Produced Magnetic Fields With Scalar Fluctuations, Robert R. Caldwell, Leonardo Motta, Marc Kamionkowski
Dartmouth Scholarship
If the conformal invariance of electromagnetism is broken during inflation, then primordial magnetic fields may be produced. If this symmetry breaking is generated by the coupling between electromagnetism and a scalar field—e.g. the inflaton, curvaton, or Ricci scalar—then these magnetic fields may be correlated with primordial density perturbations, opening a new window to the study of non-Gaussianity in cosmology. In order to illustrate, we couple electromagnetism to an auxiliary scalar field in a de Sitter background. We calculate the power spectra for scalar-field perturbations and magnetic fields, showing how a scale-free magnetic-field spectrum with rms amplitude of ∼nG at Mpc …
Generation Of Coherent Structures After Cosmic Inflation, Marcelo Gleiser, Noah Graham, Nikitas Stamatopoulos
Generation Of Coherent Structures After Cosmic Inflation, Marcelo Gleiser, Noah Graham, Nikitas Stamatopoulos
Dartmouth Scholarship
We investigate the nonlinear dynamics of hybrid inflation models, which are characterized by two real scalar fields interacting quadratically. We start by solving numerically the coupled Klein-Gordon equations in static Minkowski spacetime, searching for possible coherent structures. We find long-lived, localized configurations, which we identify as a new kind of oscillon. We demonstrate that these two-field oscillons allow for “excited” states with much longer lifetimes than those found in previous studies of single-field oscillons. We then solve the coupled field equations in an expanding Friedmann-Robertson-Walker spacetime, finding that as the field responsible for inflating the Universe rolls down to oscillate …