Spacetime and orbits of bumpy black holes (2009)
Vigeland, Sarah J., Hughes, Scott A.
Our universe contains a great number of extremely compact and massive objects which are generally accepted to be black holes. Precise observations of orbital motion near candidate black holes have...
Confusion background from compact binaries (2009)
Regimbau, T., Hughes, Scott A.
Double neutron stars are one of the most promizing sources for terrestrial gravitational wave interferometers. For actual interferometers and their planned upgrades, the probability of having a...
Modeling Extreme Mass Ratio Inspirals within the Effective-One-Body Approach (2009)
Yunes, Nicolas, Buonanno, Alessandra, Hughes, Scott A., Miller, M. Coleman, Pan, Yi
We present the first models of extreme-mass-ratio inspirals within the effective-one-body (EOB) formalism, focusing on quasi-circular orbits into non-rotating black holes. We show that the phase...
Massive black-hole binary inspirals: results from the LISA parameter estimation taskforce (2009)
Arun, K. G., Babak, Stas, Berti, Emanuele, Cornish, Neil, Cutler, Curt, Gair, Jonathan, ...
The LISA Parameter Estimation Taskforce was formed in September 2007 to provide the LISA Project with vetted codes, source distribution models and results related to parameter estimation. The...
Exploring short gamma-ray bursts as gravitational-wave standard sirens (2009)
Nissanke, Samaya, Hughes, Scott A., Holz, Daniel E., Dalal, Neal, Sievers, Jonathan L.
Recent observations support the hypothesis that a large fraction of "short-hard" gamma-ray bursts (SHBs) are associated with compact binary inspiral. Since gravitational-wave (GW) measurements of...
Gravitational waves from merging compact binaries (2009)
Largely motivated by the development of highly sensitive gravitational-wave detectors, our understanding of merging compact binaries and the gravitational waves they generate has improved...
Will Einstein Have the Last Word on Gravity? (2009)
Schutz, Bernard F., Centrella, Joan, Cutler, Curt, Hughes, Scott A.
This is a whitepaper submitted to the 2010 Astronomy Decadal Review process, addressing the potential tests of gravity theory that could be made by observations of gravitational waves in the...
Bloom, Joshua S., Holz, Daniel E., Hughes, Scott A., Menou, Kristen, Adams, Allan, Anderson, Scott F., ...
It is widely expected that the coming decade will witness the first direct detection of gravitational waves (GWs). The ground-based LIGO and Virgo GW observatories are being upgraded to advanced...
Regimbau, Tania, Hughes, Scott A.
Increasing the sensitivity of a gravitational-wave (GW) detector improves our ability to measure the characteristics of detected sources. It also increases the number of weak signals that contribute...
Massive Black Hole Binary Inspirals: Results from the LISA Parameter Estimation Taskforce (2008)
Arun, K. G., Babak, Stas, Berti, Emanuele, Cornish, Neil, Cutler, Curt, Gair, Jonathan, ...
The LISA Parameter Estimation (LISAPE) Taskforce was formed in September 2007 to provide the LISA Project with vetted codes, source distribution models, and results related to parameter estimation....
Advanced localization of massive black hole coalescences with LISA (2008)
Lang, Ryan N., Hughes, Scott A.
The coalescence of massive black holes is one of the primary sources of gravitational waves (GWs) for LISA. Measurements of the GWs can localize the source on the sky to an ellipse with a major axis...
Sundarajan, Pranesh A., Khanna, Gaurav, Hughes, Scott A., Drasco, Steve
This is the second in a series of papers whose aim is to generate adiabatic gravitational waveforms from the inspiral of stellar-mass compact objects into massive black holes. In earlier work, we...
The Self-Gravity of Pressure in Neutron Stars (2008)
Schwab, Josiah, Hughes, Scott A., Rappaport, Saul
Following an earlier analysis which examined the effect of the self-gravity of pressure on big-bang nucleosynthesis (BBN), we explore the effect of pressure's self-gravity on the structure of neutron...
Sundararajan, Pranesh A., Khanna, Gaurav, Hughes, Scott A., Drasco, Steve
This is the second in a series of papers whose aim is to generate ``adiabatic'' gravitational waveforms from the inspiral of stellar-mass compact objects into massive black holes. In earlier work, we...
Gravitational waves from extreme mass ratio inspirals: challenges in mapping the spacetime of massive, compact objects
Untangling the merger history of massive black holes with (2007)
Binary black hole coalescences emit gravitational waves that will be measurable by the space-based detector LISA to large redshifts. This suggests that LISA may be able to observe black holes grow...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2007)
Chris L. Fryer, Daniel E. Holz, Scott A. Hughes
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
Listening to theueIxU55 with (2007)
The LIGO (Laser Interferometer Gravitational-Wave Observatory) detectors have jue completed their first sciencerue following many years of planning, research, and development. LIGO is a member of...
The gravitational waves generated in the coalescence of massive binary black holes will be measurable by LISA to enormous distances. Redshifts z or larger (depending somewhat on the mass of the...
Gravitational Waves Chris, Chris L. Fryer, Daniel E. Holz, Scott A. Hughes, Michael S. Warren
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
The Astrophysical Journal, Scott A. Hughes, Roger D. Bl
Massive black holes appear to be present in the nuclei of almost all galaxies, but their genesis and evolution are not well understood. As astrophysical black holes are completely characterized by...
LISA sources and science (2007)
LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly (0.03 - 0.1) mHz < f < 0.1 Hz. This is expected to...
Localizing coalescing massive black hole binaries with gravitational waves (2007)
Lang, Ryan N., Hughes, Scott A.
Massive black hole binary coalescences are prime targets for space-based gravitational wave (GW) observatories such as {\it LISA}. GW measurements can localize the position of a coalescing binary on...
Circular and noncircular nearly horizon-skimming orbits in Kerr spacetimes (2007)
Barausse, Enrico, Hughes, Scott A., Rezzolla, Luciano
We have performed a detailed analysis of orbital motion in the vicinity of a nearly extremal Kerr black hole. For very rapidly rotating black holes (spin a=J/M>0.9524M) we have found a class of very...
Circular and non-circular nearly horizon-skimming orbits in Kerr spacetimes (2007)
Barausse, Enrico, Hughes, Scott A., Rezzolla, Luciano
We have performed a detailed analysis of orbital motion in the vicinity of a nearly extremal Kerr black hole. For very rapidly rotating black holes (spin a=J/M>0.9524M) we have found a class of very...
Sundararajan, Pranesh A., Khanna, Gaurav, Hughes, Scott A.
We revisit the problem of the emission of gravitational waves from a test mass orbiting and thus perturbing a Kerr black hole. The source term of the Teukolsky perturbation equation contains a Dirac...
“Kludge” gravitational waveforms for a test-body orbiting a Kerr black hole (2007)
Babak, Stanislav, Fang, Hua, Gair, Jonathan R., Glampedakis, Kostas, Hughes, Scott A.
One of the most exciting potential sources of gravitational waves for low-frequency, space-based gravitational wave (GW) detectors such as the proposed Laser Interferometer Space Antenna (LISA) is...
"Kludge" gravitational waveforms for a test-body orbiting a Kerr black hole (2007)
Babak, Stanislav, Fang, Hua, Gair, Jonathan R., Glampedakis, Kostas, Hughes, Scott A.
One of the most exciting potential sources of gravitational waves for low-frequency, space-based gravitational wave (GW) detectors such as the proposed Laser Interferometer Space Antenna (LISA) is...
Circular and non-circular nearly horizon-skimming orbits in Kerr spacetimes (2007)
Barausse, Enrico, Hughes, Scott A., Rezzolla, Luciano
We have performed a detailed analysis of orbital motion in the vicinity of a nearly extremal Kerr black hole. For very rapidly rotating black holes (spin a=J/M>0.9524M) we have found a class of very...
A brief survey of LISA sources and science (2006)
LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly $(0.03 - 0.1) {\rm mHz} \lesssim f \lesssim 0.1 {\rm...
(Sort of) Testing relativity with extreme mass ratio inspirals (2006)
The inspirals of ``small'' ($1 - 100 M_\odot$) compact bodies through highly relativistic orbits of massive (several $\times 10^5 M_\odot -$ several $\times 10^6 M_\odot$) black holes are among the...
Lang, Ryan N., Hughes, Scott A.
The coalescence of massive black holes generates gravitational waves (GWs) that will be measurable by space-based detectors such as LISA to large redshifts. The spins of a binary's black holes have...
"Kludge" gravitational waveforms for a test-body orbiting a Kerr black hole (2006)
Babak, Stanislav, Fang, Hua, Gair, Jonathan R., Glampedakis, Kostas, Hughes, Scott A.
One of the most exciting potential sources of gravitational waves for low-frequency, space-based gravitational wave (GW) detectors such as the proposed Laser Interferometer Space Antenna (LISA) is...
Short GRB and binary black hole standard sirens as a probe of dark energy (2006)
Dalal, Neal, Holz, Daniel E., Hughes, Scott A., Jain, Bhuvnesh
Observations of the gravitational radiation from well-localized, inspiraling compact object binaries can measure absolute source distances with high accuracy. When coupled with an independent...
Trust but verify: The case for astrophysical black holes (2005)
This article is based on a pair of lectures given at the 2005 SLAC Summer Institute. Our goal is to motivate why most physicists and astrophysicists accept the hypothesis that the most massive,...
Gravitational wave snapshots of generic extreme mass ratio inspirals (2005)
Drasco, Steve, Hughes, Scott A.
Using black hole perturbation theory, we calculate the gravitational waves produced by test particles moving on bound geodesic orbits about rotating black holes. The orbits we consider are generic -...
Computing inspirals in Kerr in the adiabatic regime. I. The scalar case (2005)
Drasco, Steve, Flanagan, Eanna E., Hughes, Scott A.
A key source for LISA will be the inspiral of compact objects into supermassive black holes. Recently Mino has shown that in the adiabatic limit, gravitational waveforms for these sources can be...
Using gravitational-wave standard sirens (2005)
Holz, Daniel E., Hughes, Scott A.
Gravitational waves (GWs) from supermassive binary black hole (BBH) inspirals are potentially powerful standard sirens (the GW analog to standard candles) (Schutz 1986, 2002). Because these systems...
Gravitational radiation reaction and inspiral waveforms in the adiabatic limit (2005)
Hughes, Scott A., Drasco, Steve, Flanagan, Eanna E., Franklin, Joel
We describe progress evolving an important limit of binary orbits in general relativity, that of a stellar mass compact object gradually spiraling into a much larger, massive black hole. These...
The basics of gravitational wave theory (2005)
Flanagan, Eanna E., Hughes, Scott A.
Einstein's special theory of relativity revolutionized physics by teaching us that space and time are not separate entities, but join as ``spacetime''. His general theory of relativity further taught...
Golden Binary Gravitational-Wave Sources: Robust Probes of Strong-Field Gravity (2004)
Hughes, Scott A., Menou, Kristen
Space-born gravitational-wave interferometers such as {\it LISA} will detect the gravitational wave (GW) signal from the inspiral, plunge and ringdown phases of massive black hole binary mergers at...
How black holes get their kicks: Radiation recoil in binary black hole mergers (2004)
Hughes, Scott A., Favata, Marc, Holz, Daniel E.
Gravitational waves from the coalescence of binary black holes carry linear momentum, causing center of mass recoil. This ``radiation rocket'' has important implications for systems with escape...
Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries (2004)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
The collapse of massive stars not only produces observable outbursts across the entire electromagnetic spectrum but, for Galactic (or near-Galactic) supernovae, detectable signals for ground-based...
Collins, Nathan A., Hughes, Scott A.
Observations have established that extremely compact, massive objects are common in the universe. It is generally accepted that these objects are black holes. As observations improve, it becomes...
How black holes get their kicks: Gravitational radiation recoil revisited (2004)
Favata, Marc, Hughes, Scott A., Holz, Daniel E.
Gravitational waves from the coalescence of binary black holes carry away linear momentum, causing center of mass recoil. This "radiation rocket" effect has important implications for systems with...
Consequences of gravitational radiation recoil (2004)
Merritt, David, Milosavljevic, Milos, Favata, Marc, Hughes, Scott A., Holz, Daniel E.
Coalescing binary black holes experience an impulsive kick due to anisotropic emission of gravitational waves. We discuss the dynamical consequences of the recoil accompanying massive black hole...
Rotating black hole orbit functionals in the frequency domain (2003)
Drasco, Steve, Hughes, Scott A.
In many astrophysical problems, it is important to understand the behavior of functions that come from rotating (Kerr) black hole orbits. It can be particularly useful to work with the frequency...
Cosmology with coalescing massive black holes (2002)
Hughes, Scott A., Holz, Daniel E.
The gravitational waves generated in the coalescence of massive binary black holes will be measurable by LISA to enormous distances. Redshifts z~10 or larger (depending somewhat on the mass of the...
Stellar collapse and gravitational waves (2002)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A., Warren, Michael S.
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
Listening to the Universe with Gravitational-Wave Astronomy (2002)
The LIGO (Laser Interferometer Gravitational-Wave Observatory) detectors have just completed their first science run, following many years of planning, research, and development. LIGO is a member of...
Approximating the inspiral of test bodies into Kerr black holes (2002)
Glampedakis, Kostas, Hughes, Scott A., Kennefick, Daniel
We present a new approximate method for constructing gravitational radiation driven inspirals of test bodies orbiting Kerr black holes. Such orbits can be fully described by a semilatus rectum p, an...
Tuning gravitational-wave detector networks to measure compact binary mergers (2002)
Gravitational waves generated by the final merger of compact binary systems depend on the structure of the binary's members. If the binary contains neutron stars, measuring such waves can teach us...
Black hole mass and spin coevolution by mergers (2002)
Hughes, Scott A., Blandford, Roger D.
Massive black holes appear to be present in the nuclei of almost all galaxies, but their genesis and evolution are not well understood. As astrophysical black holes are completely characterized by...
Approximating the inspiral of test bodies into Kerr black holes (2002)
Glampedakis, Kostas, Hughes, Scott A., Kennefick, Daniel
We present a new approximate method for constructing gravitational radiation driven inspirals of test-bodies orbiting Kerr black holes. Such orbits can be fully described by a semi-latus rectum $p$,...
New physics and astronomy with the new gravitational-wave observatories (2001)
Hughes, Scott A., Marka, Szabolcs, Bender, Peter L., Hogan, Craig J.
Gravitational-wave detectors with sensitivities sufficient to measure the radiation from astrophysical sources are rapidly coming into existence. By the end of this decade, there will exist several...
Untangling the merger history of massive black holes with LISA (2001)
Binary black hole coalescences emit gravitational waves that will be measurable by the space-based detector it LISA to large redshifts. This suggests that LISA may be able to observe black holes grow...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2001)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
The inspiral of a ``small'' ($\mu \sim 1-100 M_\odot$) compact body into a ``large'' ($M \sim 10^{5-7} M_\odot$) black hole is a key source of gravitational radiation for the space-based...
Nearly horizon skimming orbits of Kerr black holes (2001)
An unusual set of orbits about extreme Kerr black holes resides at the Boyer-Lindquist radius $r = M$, the coordinate of the hole's event horizon. These ``horizon skimming'' orbits have the property...
Comment on "Gravity Waves, Chaos, and Spinning Compact Binaries" (2001)
In this comment, I argue that chaotic effects in binary black hole inspiral will not strongly impact the detection of gravitational waves from such systems.
In its final year of inspiral, a stellar mass ($1 - 10 M_\odot$) body orbits a massive ($10^5 - 10^7 M_\odot$) compact object about $10^5$ times, spiralling from several Schwarzschild radii to the...
Gravitational waves from inspiral into massive black holes (2000)
Space-based gravitational-wave interferometers such as LISA will be sensitive to the inspiral of stellar mass compact objects into black holes with masses in the range of roughly 10^5 solar masses to...
Computing radiation from Kerr black holes: Generalization of the Sasaki-Nakamura equation (2000)
As shown by Teukolsky, the master equation governing the propagation of weak radiation in a black hole spacetime can be separated into four ordinary differential equations, one for each spacetime...
Gravitational waves from inspiral into massive black holes (1999)
Space-based gravitational-wave interferometers such as LISA will be sensitive to the inspiral of stellar mass compact objects into black holes with masses in the range of roughly 10^5 solar masses to...
A major focus of much current research in gravitation theory is on understanding how radiation reaction drives the evolution of a binary system, particularly in the extreme mass ratio limit. Such...
Evolving Einstein's Field Equations with Matter: The ``Hydro without Hydro'' Test (1999)
Baumgarte, Thomas W., Hughes, Scott A., Shapiro, Stuart L.
We include matter sources in Einstein's field equations and show that our recently proposed 3+1 evolution scheme can stably evolve strong-field solutions. We insert in our code known matter...
Seismic gravity-gradient noise in interferometric gravitational-wave detectors (1998)
Hughes, Scott A., Thorne, Kip S.
When ambient seismic waves pass near and under an interferometric gravitational-wave detector, they induce density perturbations in the Earth, which in turn produce fluctuating gravitational forces...
Seismic gravity-gradient noise in interferometric gravitational-wave detectors (1998)
Hughes, Scott A., Thorne, Kip S.
When ambient seismic waves pass near an interferometric gravitational-wave detector, they induce density perturbations in the earth which produce fluctuating gravitational forces on the...
Flanagan, Éanna É., Hughes, Scott A.
We discuss the extraction of information from detected binary black hole (BBH) coalescence gravitational waves by the ground-based interferometers LIGO and VIRGO, and by the space-based...
Flanagan, Éanna É., Hughes, Scott A.
We estimate the expected signal-to-noise ratios (SNRs) from the three phases (inspiral, merger, and ringdown) of coalescing binary black holes (BBHs) for initial and advanced ground-based...
Flanagan, Eanna E., Hughes, Scott A.
We discuss the extraction of information from detected binary black hole (BBH) coalescence gravitational waves, focusing on the merger phase that occurs after the gradual inspiral and before the...
Brady, Patrick R., Hughes, Scott A.
Recent numerical work by Wilson, Mathews, and Marronetti [J. R. Wilson, G. J. Mathews and P. Marronetti, Phys. Rev. D 54, 1317 (1996)] on the coalescence of massive binary neutron stars shows a...
Flanagan, Eanna E., Hughes, Scott A.
We estimate the expected signal-to-noise ratios (SNRs) from the three phases (inspiral,merger,ringdown) of coalescing binary black holes (BBHs) for initial and advanced ground-based interferometers...
Characterization of coronavirus MHV-A59 ORF1a polyprotein processing events (1996)
Mouse hepatitis virus A59 (MHV-A59), a coronavirus, employs a replication strategy that involves proteolytic processing of the nonstructural polyprotein encoded by gene 1. These studies have...
Transgenic mouse model for echovirus myocarditis and paralysis
Hughes, Scott A., Thaker, Harshwardhan M., Racaniello, Vincent R.
Echoviruses have been implicated in multiple human disease syndromes, including aseptic meningitis, paralysis, and heart disease, but no animal model is available for studying the pathogenesis of...
Transgenic mouse model for echovirus myocarditis and paralysis
Hughes, Scott A., Thaker, Harshwardhan M., Racaniello, Vincent R.
Echoviruses have been implicated in multiple human disease syndromes, including aseptic meningitis, paralysis, and heart disease, but no animal model is available for studying the pathogenesis of...