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2008

Faculty Publications

Haverford College

Articles 1 - 28 of 28

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Dynamic Topology In Spatiotemporal Chaos, Nicholas T. Ouellette, Jerry P. Gollub Jan 2008

Dynamic Topology In Spatiotemporal Chaos, Nicholas T. Ouellette, Jerry P. Gollub

Faculty Publications

No abstract provided.


Transport Of Finite-Sized Particles In Chaotic Flow, Nicholas T. Ouellette, P. J. J. O'Malley, Jerry P. Gollub Jan 2008

Transport Of Finite-Sized Particles In Chaotic Flow, Nicholas T. Ouellette, P. J. J. O'Malley, Jerry P. Gollub

Faculty Publications

No abstract provided.


Thermally Assisted Adiabatic Quantum Computation, Mohammad H. S. Amin, Peter John Love, Colin Truncik Jan 2008

Thermally Assisted Adiabatic Quantum Computation, Mohammad H. S. Amin, Peter John Love, Colin Truncik

Faculty Publications

No abstract provided.


Realizable Hamiltonians For Universal Adiabatic Quantum Computers, Jacob D. Biamonte, Peter John Love Jan 2008

Realizable Hamiltonians For Universal Adiabatic Quantum Computers, Jacob D. Biamonte, Peter John Love

Faculty Publications

No abstract provided.


Physics Of The Human Body [Book Review], Suzanne Amador Kane Jan 2008

Physics Of The Human Body [Book Review], Suzanne Amador Kane

Faculty Publications

No abstract provided.


Combined Analysis Of The Integrated Sachs-Wolfe Effect And Cosmological Implications, Tommaso Giannantonio, Ryan Scranton, Robert G. Crittenden, Stephen P. Boughn Jan 2008

Combined Analysis Of The Integrated Sachs-Wolfe Effect And Cosmological Implications, Tommaso Giannantonio, Ryan Scranton, Robert G. Crittenden, Stephen P. Boughn

Faculty Publications

No abstract provided.


Bootes Ii Rebooted: An Mmt/Megacam Study Of An Ultra-Faint Milky Way Satellite, S. M. Walsh, Beth Willman, D. Sand, J. Harris Jan 2008

Bootes Ii Rebooted: An Mmt/Megacam Study Of An Ultra-Faint Milky Way Satellite, S. M. Walsh, Beth Willman, D. Sand, J. Harris

Faculty Publications

No abstract provided.


Chern-Simons Modified Gravity As A Torsion Theory And Its Interaction With Fermions, Stephon Alexander, Nicolas Yunes Jan 2008

Chern-Simons Modified Gravity As A Torsion Theory And Its Interaction With Fermions, Stephon Alexander, Nicolas Yunes

Faculty Publications

No abstract provided.


The Star Formation Rate-Dense Gas Relation In The Nuclei Of Nearby Galaxies, Desika Narayanan Jan 2008

The Star Formation Rate-Dense Gas Relation In The Nuclei Of Nearby Galaxies, Desika Narayanan

Faculty Publications

We investigate the relationship between the star formation rate (SFR) and dense molecular gas mass in the nuclei of galaxies. To do this, we utilize the observed 850 μm luminosity as a proxy for the infrared luminosity (LIR) and SFR, and we correlate this with the observed CO(J = 3–2) luminosity. We find tentative evidence that the LIR-CO(J = 3–2) index is similar to the Kennicutt-Schmidt (KS) index (N ≈ 1.5) in the central ~1.7 kpc of galaxies, and it flattens to a roughly linear index when including emission from the entire galaxy. This …


The Star Formation Rate-Dense Gas Relation As Measured By Hcn (J=3-2) Emission, Robert S. Bussman, Desika Narayanan Jan 2008

The Star Formation Rate-Dense Gas Relation As Measured By Hcn (J=3-2) Emission, Robert S. Bussman, Desika Narayanan

Faculty Publications

We present observations made with the 10 m Heinrich Hertz Submillimeter Telescope of HCN(3-2) emission from a sample of 30 nearby galaxies ranging in infrared luminosity from 1010 to 1012.5 L☉ and HCN(3-2) luminosity from 106 to 109 K km s−1 pc2. We examine the correlation between the infrared luminosity and HCN(3-2) luminosity and find that the best-fit linear regression has a slope (in log-log space) of 0.74 ± 0.12. Including recently published data from Graciá-Carpio et al. tightens the constraints on the best-fit slope to 0.79 ± 0.09. This slope below unity suggests that the HCN(3-2) molecular line …


The Formation Of Polar Disk Galaxies, Chris B. Brook, Fabio Governato, Thomas Quinn, Beth Willman Jan 2008

The Formation Of Polar Disk Galaxies, Chris B. Brook, Fabio Governato, Thomas Quinn, Beth Willman

Faculty Publications

No abstract provided.


Hundreds Of Milky Way Satellites? Luminosity Bias In The Satellite Luminosity Function, Erik J. Tollerud, James S. Bullock, Louis E. Strigari, Beth Willman Jan 2008

Hundreds Of Milky Way Satellites? Luminosity Bias In The Satellite Luminosity Function, Erik J. Tollerud, James S. Bullock, Louis E. Strigari, Beth Willman

Faculty Publications

No abstract provided.


Gravitational-Wave Probe Of Effective Quantum Gravity, Stephon Alexander, Lee Samuel Finn, Nicolas Yunes Jan 2008

Gravitational-Wave Probe Of Effective Quantum Gravity, Stephon Alexander, Lee Samuel Finn, Nicolas Yunes

Faculty Publications

No abstract provided.


The Most Dark Matter Dominated Galaxies: Predicted Gamma-Ray Signals From The Faintest Milky Way Dwarfs, Louis E. Strigari, Savvas M. Koushiappas, James S. Bullock, Beth Willman Jan 2008

The Most Dark Matter Dominated Galaxies: Predicted Gamma-Ray Signals From The Faintest Milky Way Dwarfs, Louis E. Strigari, Savvas M. Koushiappas, James S. Bullock, Beth Willman

Faculty Publications

No abstract provided.


Axion Constraints In Non-Standard Thermal Histories, Daniel Grin, Tristan L. Smith, Marc Kamionkowski Jan 2008

Axion Constraints In Non-Standard Thermal Histories, Daniel Grin, Tristan L. Smith, Marc Kamionkowski

Faculty Publications

No abstract provided.


Sustainable Energy From Deep Ocean Cold Seeps, Mark E. Nielsen, Clare E. Reimers, Helen K. White, Sonam Sharma Jan 2008

Sustainable Energy From Deep Ocean Cold Seeps, Mark E. Nielsen, Clare E. Reimers, Helen K. White, Sonam Sharma

Faculty Publications

No abstract provided.


Psr J1856+0245: Arecibo Discovery Of A Young, Energetic Pulsar Coincident With The Tev Gamma-Ray Source Hess J1857+026, J. W. T. Hessels, David J. Nice, B. M. Gaensler, V. M. Kaspi, Fronefield Crawford Jan 2008

Psr J1856+0245: Arecibo Discovery Of A Young, Energetic Pulsar Coincident With The Tev Gamma-Ray Source Hess J1857+026, J. W. T. Hessels, David J. Nice, B. M. Gaensler, V. M. Kaspi, Fronefield Crawford

Faculty Publications

We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81 ms, a characteristic age of 21 kyr, and a spin-down luminosity Ė = 4.6 × 1036 ergs s−1. It is positionally coincident with the TeV γ-ray source HESS J1857+026, which has no other known counterparts. Young, energetic pulsars create wind nebulae, and more than a dozen pulsar wind nebulae have been associated with very high energy (100 GeV-100 TeV) γ-ray sources discovered with the HESS telescope. The γ-ray emission seen from HESS J1857+026 is potentially produced by …


Radio Source Contributions To The Microwave Sky, Stephen P. Boughn, Bruce Partridge Jan 2008

Radio Source Contributions To The Microwave Sky, Stephen P. Boughn, Bruce Partridge

Faculty Publications

No abstract provided.


Teaching About Fluids, Jerry P. Gollub Jan 2008

Teaching About Fluids, Jerry P. Gollub

Faculty Publications

No abstract provided.


Lower Limit To The Scale Of An Effective Theory Of Gravitation, Robert R. Caldwell, Daniel Grin Jan 2008

Lower Limit To The Scale Of An Effective Theory Of Gravitation, Robert R. Caldwell, Daniel Grin

Faculty Publications

No abstract provided.


Molecular Star Formation Rate Indicators In Galaxies, Desika Narayanan Jan 2008

Molecular Star Formation Rate Indicators In Galaxies, Desika Narayanan

Faculty Publications

We derive a physical model for the observed relations between star formation rate (SFR) and molecular line (CO and HCN) emission in galaxies and show how these observed relations are reflective of the underlying star formation law. We do this by combining 3D non-LTE radiative transfer calculations with hydrodynamic simulations of isolated disk galaxies and galaxy mergers. We demonstrate that the observed SFR-molecular line relations are driven by the relationship between molecular line emission and gas density and anchored by the index of the underlying Schmidt law controlling the SFR in the galaxy. Lines with low critical densities (e.g., CO …


The Role Of Galactic Winds On Molecular Gas Emission From Galaxy Mergers, Desika Narayanan Jan 2008

The Role Of Galactic Winds On Molecular Gas Emission From Galaxy Mergers, Desika Narayanan

Faculty Publications

Galactic winds from starbursts and active galactic nuclei (AGNs) are thought to play an important role in driving galaxies along the starburst-AGN sequence. Here, we assess the impact of these winds on the CO emission from galaxy mergers and, in particular, search for signatures of starburst and AGN-feedback-driven winds in the simulated CO morphologies and emission-line profiles. We do so by combining a three-dimensional non-LTE molecular line radiative transfer code with smoothed particle hydrodynamic (SPH) simulations of galaxy mergers that include prescriptions for star formation, black hole growth, a multiphase interstellar medium (ISM), and the winds associated with star formation …


The Nature Of Co Emission From Z~6 Quasars, Desika Narayanan Jan 2008

The Nature Of Co Emission From Z~6 Quasars, Desika Narayanan

Faculty Publications

We investigate the nature of molecular gas emission from z ~ 6 quasars via the commonly observed tracer of H2, carbon monoxide (CO). We achieve this by combining non-LTE radiative transfer calculations with merger-driven models of z ~ 6 quasar formation that arise naturally in Λ cold dark matter structure formation simulations. Motivated by observational constraints, we consider four representative z ~ 6 quasars formed in the halo mass range ~1012-1013 M☉ from different merging histories. Our main results are as follows. We find that, owing to massive starbursts and funneling of dense gas into the nuclear regions of …


‘Fire Cannot Harm It’: Mediation, Temptation And The Charismatic Power Of The Qur'an, Travis Zadeh Jan 2008

‘Fire Cannot Harm It’: Mediation, Temptation And The Charismatic Power Of The Qur'an, Travis Zadeh

Faculty Publications

No abstract provided.


Cell Surface Expression Of The Vaccinia Virus Complement Control Protein Is Mediated By Interaction With The Viral A56 Protein And Protects Infected Cells From Complement Attack, N. M. Girgis, Brian Dehaven Jan 2008

Cell Surface Expression Of The Vaccinia Virus Complement Control Protein Is Mediated By Interaction With The Viral A56 Protein And Protects Infected Cells From Complement Attack, N. M. Girgis, Brian Dehaven

Faculty Publications

The vaccinia virus (VACV) complement control protein (VCP) is the major protein secreted from VACV-infected cells. It has been reported that VCP binds to the surfaces of uninfected cells by interacting with heparan sulfate proteoglycans (HSPGs). In this study, we show that VCP is also expressed on the surfaces of infected cells and demonstrate that surface localization occurs independently of HSPGs. Since VCP does not contain a transmembrane domain, we hypothesized that VCP interacts with a membrane protein that localizes to the infected-cell surface. We show that the VACV A56 membrane protein is necessary for the cell surface expression of …


Texts And Culture In Late Antiquity: Inheritance, Authority, And Change [Book Review], Bret Mulligan Jan 2008

Texts And Culture In Late Antiquity: Inheritance, Authority, And Change [Book Review], Bret Mulligan

Faculty Publications

Review of Texts and Culture in Late Antiquity: Inheritance, Authority, and Change by J.H.D. Scourfield.


Ancient Letters. Classical And Late Antique Epistolography [Book Review], Bret Mulligan Jan 2008

Ancient Letters. Classical And Late Antique Epistolography [Book Review], Bret Mulligan

Faculty Publications

Review of Ancient Letters. Classical and Late Antique Epistolography by Ruth Morello and A.D. Morrison.


The Ascent Of The Abundant: How Mutational Networks Constrain Evolution, Matthew C. Cowperthwaite, Evan P. Economo, William R. Harcombe, Eric L. Miller, Lauren Ancel Meyers Jan 2008

The Ascent Of The Abundant: How Mutational Networks Constrain Evolution, Matthew C. Cowperthwaite, Evan P. Economo, William R. Harcombe, Eric L. Miller, Lauren Ancel Meyers

Faculty Publications

No abstract provided.