Gravitino Warm Dark Matter with Entropy Production (2009)
Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale...
Determination of Dark Matter Properties at High-Energy Colliders (2009)
If the cosmic dark matter consists of weakly-interacting massive particles, these particles should be produced in reactions at the next generation of high-energy accelerators. Measurements at these...
Color Bimodality in M87 Globular Clusters (2008)
Waters, Christopher Z., Zepf, Stephen E., Lauer, Tod R., Baltz, Edward A.
We present an analysis of a 50 orbit HST ACS observation of the M87 globular cluster system. We use the extraordinary depth of this dataset to test whether the colors and magnitudes show evidence for...
Strategies for Determining the Nature of Dark Matter (2008)
In this review, we discuss the role of the various experimental programs taking part in the broader effort to identify the particle nature of dark matter. In particular, we focus on electroweak scale...
Analytic models of plausible gravitational lens potentials (2007)
Baltz, Edward A., Marshall, Phil, Oguri, Masamune
Gravitational lenses on galaxy scales are plausibly modelled as having ellipsoidal symmetry and a universal dark matter density profile, with a Sersic profile to describe the distribution of baryonic...
Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites? (2006)
Baltz, Edward A., Taylor, James E., Wai, Lawrence L.
The nature of the cosmic dark matter is unknown. The most compelling hypothesis is that dark matter consists of weakly interacting massive particles (WIMPs) in the 100 GeV mass range. Such particles...
Luminosity Function of Faint Globular Clusters in M87 (2006)
Waters, Christopher Z., Zepf, Stephen E., Lauer, Tod R., Baltz, Edward A., Silk, Joseph
We present the luminosity function to very faint magnitudes for the globular clusters in M87, based on a 30 orbit \textit{Hubble Space Telescope (HST)} WFPC2 imaging program. The very deep images and...
Determination of Dark Matter Properties at High-Energy Colliders (2006)
Baltz, Edward A., Battaglia, Marco, Peskin, Michael E., Wizansky, Tommer
If the cosmic dark matter consists of weakly-interacting massive particles, these particles should be produced in reactions at the next generation of high-energy accelerators. Measurements at these...
MACHOs in M31? Absence of evidence but not evidence of absence (2005)
Widrow, Lawrence M., Cseresnjes, Patrick, Kuijken, Konrad, Crotts, Arlin P. S., Bergier, Alexander, ...
We present results of a microlensing survey toward the Andromeda Galaxy (M31) carried out during four observing seasons at the Isaac Newton Telescope (INT). This survey is part of the larger...
HST Imaging of MEGA Microlensing Candidates in M31 (2005)
Cseresnjes, Patrick, Crotts, Arlin P. S., Bergier, Alex, Baltz, Edward A., Gyuk, Geza, ...
We investigate $HST$/ACS and WFPC2 images at the positions of five candidate microlensing events from a large survey of variability in M31 (MEGA). Three closely match unresolved sources, and two...
It is now widely accepted that most of mass--energy in the universe is unobserved except by its gravitational effects. Baryons make only about 4% of the total, with "dark matter" making up about 23%...
Kaluza-Klein Dark Matter, Electrons and Gamma Ray Telescopes (2004)
Kaluza-Klein dark matter particles can annihilate efficiently into electron-positron pairs, providing a discrete feature (a sharp edge) in the cosmic $e^+ e^-$ spectrum at an energy equal to the...
Microlensing Surveys of M31 in the Wide Field Imaging Era (2004)
The Andromeda Galaxy (M31) is the closest large galaxy to the Milky Way, thus it is an important laboratory for studying massive dark objects in galactic halos (MACHOs) by gravitational microlensing....
Baltz, Edward A., Gondolo, Paolo
We explore the full parameter space of Minimal Supergravity (mSUGRA), allowing all four continuous parameters (the scalar mass m_0, the gaugino mass m_1/2, the trilinear coupling A_0, and the ratio...
Evidence of Halo Microlensing in M31 (2004)
Uglesich, Robert R., Crotts, Arlin P. S., Baltz, Edward A., Boyle, Richard P., Corbally, Christopher J.
We report results from intensive monitoring of two fields on either side of M31,emphasizing microlensing involving stars and masses in M31. These results stem from the three-year VATT/Columbia survey...
An Erupting Classical Nova in a Globular Cluster of M87 (2004)
Shara, Michael M., Zurek, David R., Baltz, Edward A., Lauer, Tod R., Silk, Joseph
Only one certain classical nova eruption has ever been detected inside a globular cluster - nova 1860 A.D. (T Sco) in M80. During a survey of M87 we have detected an erupting star coincident (to...
Variable stars in M31 from the MEGA survey (2003)
Alves, David R., Baltz, Edward A., Crotts, Arlin, Bergier, Alex, Cseresnjes, Patrick, Gersch, Alan
This paper has been withdrawn.
MEGA: Microlensing Exploration of the Galaxy and Andromeda (2003)
Alves, David R., Baltz, Edward A., Crotts, Arlin, Bergier, Alex, Cseresnjes, Patrick, Gersch, Alan
This paper has been withdrawn.
Microlensing of gamma ray bursts by stars and MACHOs (2003)
The microlensing interpretation of the optical afterglow of GRB 000301C seems naively surprising, since a simple estimate of the stellar microlensing rate gives less than one in four hundred for a...
Microlensing Candidates in M87 and the Virgo Cluster with the Hubble Space Telescope (2003)
Baltz, Edward A., Lauer, Tod R., Zurek, David R., Gondolo, Paolo, Shara, Michael M., Silk, Joseph, ...
The position of the giant elliptical galaxy M87 at the center of the Virgo Cluster means that the inferred column density of dark matter associated with both the cluster halo and the galaxy halo is...
Nuclear and Particle Astrophysics at CIPANP 2003 (2003)
Baltz, Edward A., Stone, James
In the nuclear and particle astrophysics session of CIPANP 2003 we heard talks on a number of topics, focused for the most part into four broad areas. Here we outline the discussions of the standard...
First Microlensing Events From The MEGA Survey Of M31 (2003)
Kuijken, Konrad H., Crotts, Arlin P. S., Sackett, Penny D., Sutherland, Will J., Uglesich, Robert R., ...
We present the first M31 candidate microlensing events from the Microlensing Exploration of the Galaxy and Andromeda (MEGA) survey. MEGA uses several telescopes to detect microlensing towards the...
DarkSUSY - A numerical package for supersymmetric dark matter calculations (2002)
Gondolo, Paolo, Edsjo, Joakim, Ullio, Piero, Bergstrom, Lars, Schelke, Mia, Baltz, Edward A.
The question of the nature of dark matter in the Universe remains one of the most outstanding unsolved problems in basic science. One of the best motivated particle physics candidates is the lightest...
The positron excess and supersymmetric dark matter (2002)
Baltz, Edward A., Edsjo, Joakim, Freese, Katherine, Gondolo, Paolo
Using a new instrument, the HEAT collaboration has confirmed the excess of cosmic ray positrons that they first detected in 1994. We explore the possibility that this excess is due to the...
Improved constraints on supersymmetric dark matter from muon g-2 (2002)
The new measurement of the anomalous magnetic moment of the muon by the Brookhaven AGS experiment 821 again shows a discrepancy with the Standard Model value. We investigate the consequences of these...
Event rates and timescale distributions from realistic microlensing models of M31 (2002)
Baltz, Edward A., Gyuk, Geza, Crotts, Arlin
We provide a set of microlensing event rate maps for M31, the Andromeda Galaxy. Rates for M31 microlensing were calculated on the basis of a four component model of the lens and source populations:...
A novel antimatter detector based on X-ray deexcitation of exotic atoms (2001)
Mori, Kaya, Hailey, Charles J., Baltz, Edward A., Craig, William W., Kamionkowski, Marc, Serber, William T., ...
We propose a novel antiparticle detector. The gaseous antiparticle spectrometer (GAPS) effects particle identification through the characteristic X-rays emitted by antiparticles when they form exotic...
The cosmic ray positron excess and neutralino dark matter (2001)
Baltz, Edward A., Edsjo, Joakim, Freese, Katherine, Gondolo, Paolo
Using a new instrument, the HEAT collaboration has confirmed the excess of cosmic ray positrons that they first detected in 1994. We explore the possibility that this excess is due to the...
Gravitino Warm Dark Matter with Entropy Production (2001)
Baltz, Edward A., Murayama, Hitoshi
Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale...
DarkSUSY - A numerical package for dark matter calculations in the MSSM (2000)
Gondolo, Paolo, Edsjo, Joakim, Bergstrom, Lars, Ullio, Piero, Baltz, Edward A.
The question of the nature of the dark matter in the Universe remains one of the most outstanding unsolved problems in basic science. One of the best motivated particle physics candidates is the...
Searching for extragalactic planets (1999)
Baltz, Edward A., Gondolo, Paolo
Are there other planetary systems in our Universe? Indirect evidence has been found for planets orbiting other stars in our galaxy: the gravity of orbiting planets makes the star wobble, and the...
Binary events and extragalactic planets in pixel microlensing (1999)
Baltz, Edward A., Gondolo, Paolo
Pixel microlensing, i.e. gravitational microlensing of unresolved stars, can be used to explore distant stellar systems, and as a bonus may be able to detect extragalactic planets. In these studies,...
Event Rate and Einstein Time Evaluation in Pixel Microlensing (1999)
Baltz, Edward A., Silk, Joseph
It has been shown that a flux--weighted full width at half maximum timescale of a microlensing event can be used in an unbiased estimator of the optical depth. For the first time, this allows a...
Positron Propagation and Fluxes from Neutralino Annihilation in the Halo (1998)
Baltz, Edward A., Edsjo, Joakim
Supersymmetric neutralinos are one of the most promising candidates for the dark matter in the Universe. If they exist, they should make up some fraction of the Milky Way halo. We investigate the...
Limits on R-parity violation from cosmic ray antiprotons (1998)
Gondolo, Paolo, Baltz, Edward A.
We constrain the hadronic R-parity violating couplings in extensions to the minimal supersymmetric standard model. These interactions violate baryon and lepton number, and allow the lightest...
Neutralino decay rates with explicit R-parity violation (1998)
Gondolo, Paolo, Baltz, Edward A.
We compute the neutralino decay rate in the minimal supersymmetric standard model with the addition of explicit R-parity violation. We include the complete squark and slepton mixing matrices,...
Probing the structure of the cold dark matter halo with ancient mica (1997)
Baltz, Edward A., Westphal, Andrew J., Snowden-Ifft, Daniel P.
Mica can store (for >1 Gy) etchable tracks caused by atoms recoiling from WIMPs. Ancient mica is a directional detector despite the complex motions it makes with respect to the WIMP "wind". We can...
Spectral Features from the Reionization Epoch (1997)
Baltz, Edward A., Gnedin, Nickolay Y., Silk, Joseph
Emission lines in hydrogen can be used to measure the approximate redshift of the reionization of the universe. This is an important measurement given the lack of a convincing theoretical prediction...
Limits on R-parity violation from cosmic ray antiprotons (1997)
Baltz, Edward A., Gondolo, Paolo
We constrain the hadronic R-parity violating couplings in extensions to the minimal supersymmetric standard model. These interactions violate baryon and lepton number, and allow the lightest...
Adiabatic scattering in twisting tubes / (1995)
Baltz, Edward A. (Edward Anthony)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.