Testing gravity on kiloparsec scales with strong gravitational lenses (2009)
Modifications to general relativity generically predict time and scale-dependent effects which may be probed by observations of strong lensing by galaxies. Measurements of the stellar velocity...
Inflationary gravitational-wave background and measurements of the scalar spectral index (2008)
Smith, Tristan L., Kamionkowski, Marc, Cooray, Asantha
Inflation predicts a stochastic background of gravitational waves over a broad range of frequencies, from those accessible with cosmic microwave background (CMB) measurements, to those accessible...
Axion constraints in nonstandard thermal histories (2008)
Grin, Daniel, Smith, Tristan L., Kamionkowski, Marc
It is usually assumed that dark matter is produced during the radiation-dominated era. There is, however, no direct evidence for radiation domination prior to big-bang nucleosynthesis. Two...
The inflationary gravitational-wave background and measurements of the scalar spectral index (2008)
Smith, Tristan L., Kamionkowski, Marc, Cooray, Asantha
Inflation predicts a stochastic background of gravitational waves over a broad range of frequencies, from those accessible with cosmic microwave background (CMB) measurements, to those accessible...
Effects of Chern-Simons gravity on bodies orbiting the Earth (2008)
Smith, Tristan L., Erickcek, Adrienne L., Caldwell, Robert R., Kamionkowski, Marc
One of the possible low-energy consequences of string theory is the addition of a Chern-Simons term to the standard Einstein-Hilbert action of general relativity. It can be argued that the...
Axion constraints in non-standard thermal histories (2007)
Grin, Daniel, Smith, Tristan L., Kamionkowski, Marc
It is usually assumed that dark matter is produced during the radiation dominated era. There is, however, no direct evidence for radiation domination prior to big-bang nucleosynthesis. Two...
The effects of Chern-Simons gravity on bodies orbiting the Earth (2007)
Smith, Tristan L., Erickcek, Adrienne L., Caldwell, Robert R., Kamionkowski, Marc
One of the possible low-energy consequences of string theory is the addition of a Chern-Simons term to the standard Einstein-Hilbert action of general relativity. It can be argued that the...
Solar System constraints to general f(R) gravity (2007)
Chiba, Takeshi, Smith, Tristan L., Erickcek, Adrienne L.
It has been proposed that cosmic acceleration or inflation can be driven by replacing the Einstein-Hilbert action of general relativity with a function f(R) of the Ricci scalar R. Such f(R) gravity...
Non-Gaussian covariance of CMB B modes of polarization and parameter degradation (2007)
Li, Chao, Smith, Tristan L., Cooray, Asantha
The B-mode polarization lensing signal is a useful probe of the neutrino mass and to a lesser extent the dark energy equation of state as the signal depends on the integrated mass power spectrum...
Solar system tests do rule out 1/R gravity (2006)
Erickcek, Adrienne L., Smith, Tristan L., Kamionkowski, Marc
Shortly after the addition of a 1/R term to the Einstein-Hilbert action was proposed as a solution to the cosmic-acceleration puzzle, Chiba showed that such a theory violates Solar System tests of...
Solar System constraints to general f(R) gravity (2006)
Chiba, Takeshi, Smith, Tristan L., Erickcek, Adrienne L.
It has been proposed that cosmic acceleration or inflation can be driven by replacing the Einstein-Hilbert action of general relativity with a function f(R) of the Ricci scalar R. Such f(R) gravity...
Solar System tests DO rule out 1/R gravity (2006)
Erickcek, Adrienne L., Smith, Tristan L., Kamionkowski, Marc
Shortly after the addition of a 1/R term to the Einstein-Hilbert action was proposed as a solution to the cosmic-acceleration puzzle, Chiba showed that such a theory violates Solar System tests of...
Non-Gaussian Covariance of CMB B-modes of Polarization and Parameter Degradation (2006)
Li, Chao, Smith, Tristan L., Cooray, Asantha
The B-mode polarization lensing signal is a useful probe of the neutrino mass and to a lesser extent the dark energy equation of state as the signal depends on the integrated mass power spectrum...
New Cosmic Microwave Background Constraint to Primordial Gravitational Waves (2006)
Smith, Tristan L., Pierpaoli, Elena, Kamionkowski, Marc
Primordial gravitational waves (GWs) with frequencies >~10^-15 Hz contribute to the radiation density of the Universe at the time of decoupling of the cosmic microwave background (CMB). This affects...
Smith, Tristan L., Peiris, Hiranya V., Cooray, Asantha
A detection of the primordial gravitational wave background is considered to be the "smoking-gun" evidence for inflation. While superhorizon waves are probed with cosmic microwave background (CMB)...
A new cosmic microwave background constraint to primordial gravitational waves (2006)
Smith, Tristan L., Pierpaoli, Elena, Kamionkowski, Marc
Primordial gravitational waves (GWs) with frequencies > 10^{-15} Hz contribute to the radiation density of the Universe at the time of decoupling of the cosmic microwave background (CMB). The effects...
Smith, Tristan L., Peiris, Hiranya V., Cooray, Asantha
A detection of the primordial gravitational wave background is considered to be the ``smoking-gun '' evidence for inflation. While super-horizon waves are probed with cosmic microwave background...
Direct detection of the inflationary gravitational-wave background (2006)
Smith, Tristan L., Kamionkowski, Marc, Cooray, Asantha
Inflation generically predicts a stochastic background of gravitational waves over a broad range of frequencies, from those accessible with cosmic microwave background (CMB) measurements, to those...
Direct detection of the inflationary gravitational wave background (2005)
Smith, Tristan L., Kamionkowski, Marc, Cooray, Asantha
Inflation generically predicts a stochastic background of gravitational waves over a broad range of frequencies, from those accessible with cosmic microwave background (CMB) measurements, to those...