Meerburg, P. Daniel, Van Der Schaar, Jan Pieter, Jackson, Mark G.
Deviations from the Bunch-Davies vacuum during an inflationary period can leave a testable imprint on the higher-order correlations of the CMB and large scale structures in the Universe. The effect...
Constraining Running Non-Gaussianity (2009)
Sefusatti, Emiliano, Liguori, Michele, Yadav, Amit P. S., Jackson, Mark G., Pajer, Enrico
The primordial non-Gaussian parameter fNL has been shown to be scale-dependent in several models of inflation with a variable speed of sound. Starting from a simple ansatz for a scale-dependent...
Gravitational Wave Bursts from Cosmic Superstring Reconnections (2009)
Jackson, Mark G., Siemens, Xavier
We compute the gravitational waveform produced by cosmic superstring reconnections. This is done by first constructing the superstring reconnection trajectory, which closely resembles that of...
Holographic Geometry and Noise in Matrix Theory (2008)
Hogan, Craig J., Jackson, Mark G.
Using Matrix Theory as a concrete example of a fundamental holographic theory, we show that the emergent macroscopic spacetime displays a new macroscopic quantum structure, holographic geometry, and...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G, Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
CMBPol Mission Concept Study: A Mission to Map our Origins (2008)
Baumann, Daniel, Cooray, Asantha, Dodelson, Scott, Dunkley, Joanna, Fraisse, Aurélien A., Jackson, Mark G., ...
Quantum mechanical metric fluctuations during an early inflationary phase of the universe leave a characteristic imprint in the polarization of the cosmic microwave background (CMB). The amplitude of...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G., Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
Spin-Statistics Violations in Superstring Theory (2008)
I describe how superstring theory may violate spin-statistics in an experimentally observable manner. Reviewing the basics of superstring interactions and how to utilize these to produce a...
Spin-Statistics Violations from Heterotic String Worldsheet Instantons (2008)
In this paper we consider the role that worldsheet instantons in the heterotic string could play in spin-statistics violations. Such violations are nonperturbative in the string tension and so would...
Interactions of Cosmic Superstrings (2007)
We develop methods by which cosmic superstring interactions can be studied in detail. These include the reconnection probability and emission of radiation such as gravitons or small string loops....
A New Spin on Quantum Gravity (2007)
Jackson, Mark G., Hogan, Craig J.
We suggest that the (small but nonvanishing) cosmological constant, and the holographic properties of gravitational entropy, may both reflect unconventional quantum spin-statistics at a fundamental...
A Note on Cosmic (p,q,r) Strings (2006)
The spectrum of $(p,q)$ bound states of F- and D-strings has a distinctive square-root tension formula that is hoped to be a hallmark of fundamental cosmic strings. We point out that the...
Cosmic Superstring Scattering in Backgrounds (2006)
We generalize the calculation of cosmic superstring reconnection probability to non-trivial backgrounds. This is done by modeling cosmic strings as wound tachyon modes in the 0B theory, and the...
Gravity from a Modified Commutator (2005)
We show that a suitably chosen position-momentum commutator can elegantly describe many features of gravity, including the IR/UV correspondence and dimensional reduction (`holography'). Using the...
String windings in the early universe (2004)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We study string dynamics in the early universe. Our motivation is the proposal of Brandenberger and Vafa, that string winding modes may play a key role in decompactifying three spatial dimensions. We...
Collisions of Cosmic F- and D-strings (2004)
Jackson, Mark G., Jones, Nicholas T., Polchinski, Joseph
Recent work suggests that fundamental and Dirichlet strings, and their (p,q) bound states, may be observed as cosmic strings. The evolution of cosmic string networks, and therefore their...
Brane gases in the early universe: thermodynamics and cosmology (2003)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We consider the thermodynamic and cosmological properties of brane gases in the early universe. Working in the low energy limit of M-theory we assume the universe is a homogeneous but anisotropic...
Brane gas cosmology in M-theory: late time behavior (2002)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We investigate the late-time behavior of a universe containing a supergravity gas and wrapped 2-branes in the context of M-theory compactified on T^10. The supergravity gas tends to drive uniform...
A Quantum Mechanical Model of Spherical Supermembranes (2002)
Conley, John, Geller, Ben, Jackson, Mark G., Pomerance, Laura, Shrivastava, Sharad
We present a quantum mechanical model of spherical supermembranes. Using superfields to represent the cartesian coordinates of the membrane, we are able to exactly determine its supersymmetric vacua....
Cosmological String Gas on Orbifolds (2002)
Easther, Richard, Greene, Brian R., Jackson, Mark G.
It has long been known that strings wound around incontractible cycles can play a vital role in cosmology. In particular, in a spacetime with toroidal spatial hypersurfaces, the dynamics of the...
The Stability of Noncommutative Scalar Solitons (2001)
We determine the stability conditions for a radially symmetric noncommutative scalar soliton at finite noncommutivity parameter $\theta$. We find an intriguing relationship between the stability and...
Two Black Hole Holography, Lensing and Intensity (2001)
We numerically verify the analysis of the "expanding horizon" theory of Susskind in relation to the 't Hooft holographic conjecture. By using a numerical simulation to work out the image formed by...