Boyle, Latham A., Buonanno, Alessandra
We derive a general master equation relating the gravitational-wave observables r and Omega_gw(f). Here r is the tensor-to-scalar ratio, constrained by cosmic-microwave-background (CMB) experiments;...
Probing the early universe with inflationary gravitational waves (2005)
Boyle, Latham A., Steinhardt, Paul J.
Near comoving wavenumber k, the gravitational-wave background (GWB) from inflation carries information about the physical conditions near two moments in cosmic history: the moment when k ``left the...
Inflationary predictions for scalar and tensor fluctuations reconsidered (2005)
Boyle, Latham A., Steinhardt, Paul J., Turok, Neil
We reconsider the predictions of inflation for the spectral index of scalar (energy density) fluctuations (n_s) and the tensor/scalar ratio (r) using a discrete, model-independent measure of the...
Boyle, Latham A., Steinhardt, Paul J., Turok, Neil
For a 4-dimensional spatially-flat Friedmann-Robertson-Walker universe with a scalar field $\phi(x)$, potential $V(\phi)$ and constant equation of state $w=p/\rho$, we show that an expanding solution...
The cosmic gravitational wave background in a cyclic universe (2003)
Boyle, Latham A., Steinhardt, Paul J., Turok, Neil
Inflation predicts a primordial gravitational wave spectrum that is slightly ``red,'' i.e., nearly scale-invariant with slowly increasing power at longer wavelengths. In this paper, we compute both...
Spintessence! New Models for Dark Matter and Dark Energy (2001)
Boyle, Latham A., Caldwell, Robert R., Kamionkowski, Marc
We investigate a class of models for dark matter and/or negative-pressure, dynamical dark energy consisting of ``spintessence,'' a complex scalar field $\phi$ spinning in a U(1)-symmetric potential...