Feng, Jonathan L., Kaplinghat, Manoj, Yu, Hai-Bo
Dark matter with Sommerfeld-enhanced annihilation has been proposed to explain observed cosmic ray positron excesses in the 10 GeV to TeV energy range. We show that the required enhancement implies...
Accurate masses for dispersion-supported galaxies (2009)
Wolf, Joe, Martinez, Gregory D., Bullock, James S., Kaplinghat, Manoj, Geha, Marla, Munoz, Ricardo R., ...
We derive an accurate mass estimator for dispersion-supported stellar systems and demonstrate its validity by analyzing resolved line-of-sight velocity data for globular clusters, dwarf galaxies, and...
The Dark Disk of the Milky Way (2009)
Purcell, Chris W., Bullock, James S., Kaplinghat, Manoj
Massive satellite accretions onto early galactic disks can lead to the deposition of dark matter in disk-like configurations that co-rotate with the galaxy. This phenomenon has potentially dramatic...
Hidden Charged Dark Matter (2009)
Feng, Jonathan L., Kaplinghat, Manoj, Tu, Huitzu, Yu, Hai-Bo
Can dark matter be stabilized by charge conservation, just as the electron is in the standard model? We examine the possibility that dark matter is hidden, that is, neutral under all standard model...
Pulsars as the Source of the WMAP Haze (2009)
Kaplinghat, Manoj, Phalen, Daniel J., Zurek, Kathryn M.
The WMAP haze is an excess in the 22 to 93 GHz frequency bands of WMAP extending about 10 degrees from the galactic center. We show that synchrotron emission from electron-positron pairs injected...
Observing the Evolution of the Universe (2009)
Aguirre, James, Amblard, Alexandre, Ashoorioon, Amjad, Baccigalupi, Carlo, Balbi, Amedeo, Bartlett, James, ...
How did the universe evolve? The fine angular scale (l>1000) temperature and polarization anisotropies in the CMB are a Rosetta stone for understanding the evolution of the universe. Through detailed...
Martinez, Gregory D., Bullock, James S., Kaplinghat, Manoj, Strigari, Louis E., Trotta, Roberto
We present a general methodology for determining the gamma-ray flux from annihilation of dark matter particles in Milky Way satellite galaxies, focusing on two promising satellites as examples: Segue...
Bullock, James S., Kaplinghat, Manoj, Fruchter, Andrew, Geha, Marla, Simon, Joshua D., Strigari, Louis E., ...
Over the past five years, searches in Sloan Digital Sky Survey data have more than doubled the number of known dwarf satellite galaxies of the Milky Way, and have revealed a population of ultra-faint...
Strong gravitational lensing probes of the particle nature of dark matter (2009)
Moustakas, Leonidas A., Abazajian, Kevork, Benson, Andrew, Bolton, Adam S., Bullock, James S., Chen, Jacqueline, ...
There is a vast menagerie of plausible candidates for the constituents of dark matter, both within and beyond extensions of the Standard Model of particle physics. Each of these candidates may have...
The Role of Dwarf Galaxies in Building Large Stellar Halos (2009)
Kirby, Evan N., Guhathakurta, Puragra, Bullock, James S., Frebel, Anna, Geha, Marla, Gilbert, Karoline M., ...
The hierarchical theory of galaxy formation rests on the idea that smaller galactic structures merge to form the galaxies that we see today. The past decade has provided remarkable observational...
Temperature and Polarization Spectra (2008)
Ω De, Wayne Hu, Dragan Huterer, Manoj Kaplinghat, Michael Mortonson, Yong-seon Song, ...
reionization TE gravitational waves 10 100 1000 l (multipole) EE BB gravitational lensing Lensing of CMB Fields Gravitational Lensing • Lensing is a surface brightness conserving remapping of...
CMBPol Mission Concept Study: Gravitational Lensing (2008)
Smith, Kendrick M., Cooray, Asantha, Das, Sudeep, Doré, Olivier, Hanson, Duncan, Hirata, Chris, ...
Gravitational lensing of the cosmic microwave background by large-scale structure in the late universe is both a source of cosmological information and a potential contaminant of primordial gravity...
A common mass scale for satellite galaxies of the Milky Way (2008)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Simon, Joshua D., Geha, Marla, Willman, Beth, ...
The Milky Way has at least twenty-three known satellite galaxies that shine with luminosities ranging from about a thousand to a billion times that of the Sun. Half of these galaxies were discovered...
Strigari, Louis E., Koushiappas, Savvas M., Bullock, James S., Kaplinghat, Manoj, Simon, Joshua D., Geha, Marla, ...
We use kinematic data from three new nearby, extremely low luminosity Milky Way dwarf galaxies (Ursa Major II, Willman 1, and Coma Berenices) to constrain the properties of their dark matter halos,...
Proper Motion of Milky Way Dwarf Spheroidals from Line-of-Sight Velocities (2008)
Kaplinghat, Manoj, Strigari, Louis E.
Proper motions for several Milky Way dwarf spheroidal (dSph) galaxies have been determined using both ground and space-based imaging. These measurements require long baselines and repeat observations...
Alex Amblard, Beichman, Charles, Bock, James, Caldwell, Robert, Carlstrom, John, Church, Sarah, ...
When we began our study we sought to answer five fundamental implementation questions: 1) can foregrounds be measured and subtracted to a sufficiently low level?; 2) can systematic errors be...
Effects of galaxy-halo alignment and adiabatic contraction on gravitational lens statistics (2007)
Minor, Quinn E., Kaplinghat, Manoj
We study the strong gravitational lens statistics of triaxial cold dark matter (CDM) halos occupied by central early-type galaxies. We calculate the image separation distribution for double, cusp and...
Strigari, Louis E., Koushiappas, Savvas M., Bullock, James S., Kaplinghat, Manoj, Simon, Joshua D., Geha, Marla, ...
We use kinematic data from three new, nearby, extremely low-luminosity Milky Way dwarf galaxies (Ursa Major II, Willman 1, and Coma Berenices) to constrain the properties of their dark matter halos,...
MeV Dark Matter and Small Scale Structure (2007)
Hooper, Dan, Kaplinghat, Manoj, Strigari, Louis E., Zurek, Kathryn M.
WIMPs with electroweak scale masses (neutralinos, etc.) remain in kinetic equilibrium with other particle species until temperatures approximately in the range of 10 MeV to 1 GeV, leading to the...
Redefining the Missing Satellites Problem (2007)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Diemand, Juerg, Kuhlen, Michael, Madau, Piero
Numerical simulations of Milky-Way size Cold Dark Matter (CDM) halos predict a steeply rising mass function of small dark matter subhalos and a substructure count that greatly outnumbers the observed...
Determining the Nature of Dark Matter with Astrometry (2007)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj
We show that measurements of stellar proper motions in dwarf spheroidal galaxies provide a powerful probe of the nature of dark matter. Allowing for general dark matter density profiles and stellar...
Redefining the missing satellites problem (2007)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Diemand, Juerg, Kuhlen, Michael, Madau, Piero
Strigari, Louis E., Koushiappas, Savvas M., Bullock, James S., Kaplinghat, Manoj
We examine the prospects for detecting gamma-rays from dark matter annihilation in the six most promising dwarf spheroidal (dSph) satellite galaxies of the Milky Way. We use recently-measured...
Amblard, Alexandre, Cooray, Asantha, Kaplinghat, Manoj
B-modes of Cosmic Microwave Background (CMB) polarization can be created by a primordial gravitational wave background. If this background was created by Inflation, then the amplitude of the...
Cosmological Information from Lensed CMB Power Spectra (2006)
Smith, Kendrick M., Hu, Wayne, Kaplinghat, Manoj
Gravitational lensing distorts the cosmic microwave background (CMB) temperature and polarization fields and encodes valuable information on distances and growth rates at intermediate redshifts into...
Dark Matter Halos with Cores from Hierarchical Structure Formation (2006)
Strigari, Louis E., Kaplinghat, Manoj, Bullock, James S.
We show that dark matter emerging from late decays (z < 1000) produces a linear power spectrum identical to that of Cold Dark Matter (CDM) on all observationally relavant scales (> 0.1 Mpc), and...
Big Bang Nucleosynthesis with Bound States of Long-lived Charged Particles (2006)
Kaplinghat, Manoj, Rajaraman, Arvind
Charged particles (X) decaying after primordial nucleosynthesis are constrained by the requirement that their decay products should not change the light element abundances drastically. If the...
A Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy? (2006)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Kravtsov, Andrey V., Gnedin, Oleg Y., Abazajian, Kevork, ...
We use measurements of the stellar velocity dispersion profile of the Fornax dwarf spheroidal galaxy to derive constraints on its dark matter distribution. Though the data are unable to distinguish...
Stable Models of superacceleration (2006)
Kaplinghat, Manoj, Rajaraman, Arvind
We discuss an instability in a large class of models where dark energy is coupled to matter. In these models the mass of the scalar field is much larger than the expansion rate of the Universe. We...
Dark Matter from Early Decays (2005)
Two leading dark matter candidates from supersymmetry and other theories of physics beyond the standard model are WIMPs and weak scale gravitinos. If the lightest stable particle is a gravitino, then...
APS Neutrino Study: Report of the Neutrino Astrophysics and Cosmology Working Group (2004)
Barwick, Steve W., Beacom, John F., Cianciolo, Vince, Dodelson, Scott, Feng, Jonathan L., Fuller, George M., ...
In 2002, Ray Davis and Masatoshi Koshiba were awarded the Nobel Prize in Physics ``for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos.'' However, while...
Weak Lensing of the CMB: Sampling Errors on B-Modes (2004)
Smith, Kendrick M., Hu, Wayne, Kaplinghat, Manoj
The B modes generated by the lensing of CMB polarization are a primary target for the upcoming generation of experiments and can potentially constrain quantities such as the neutrino mass and dark...
Wayne Hu, Christopher Gordon, Matt Hedman, Gil Holder, Manoj Kaplinghat, Kendrick Smith, ...
gravitational waves 10 100 1000 l (multipole)
Testing for a Super-Acceleration Phase of the Universe (2003)
Kaplinghat, Manoj, Bridle, Sarah
We propose a method to probe the phenomenological nature of dark energy which makes no assumptions about the evolution of its energy density. We exemplify this method with a test for a...
The Supernova Relic Neutrino Backgrounds at KamLAND and Super-Kamiokande (2003)
Strigari, Louis E., Kaplinghat, Manoj, Steigman, Gary, Walker, Terry P.
We calculate the Supernova Relic Neutrino (SRN) background flux for the KamLAND and Super-Kamiokande (SK) detectors, motivated by the reduction in background at SK and new results for the star...
Applications of High Resolution High Sensitivity Observations of the CMB (2003)
With WMAP putting the phenomenological standard model of cosmology on a strong footing, one can look forward to mining the cosmic microwave background (CMB) for fundamental physics with higher...
Primeval Corrections to the CMB Anisotropies (2003)
Kaloper, Nemanja, Kaplinghat, Manoj
We show that deviations of the quantum state of the inflaton from the thermal vacuum of inflation may leave an imprint in the CMB anisotropies. The quantum dynamics of the inflaton in such a state...
Determining Neutrino Mass from the CMB Alone (2003)
Kaplinghat, Manoj, Knox, Lloyd, Song, Yong-Seon
Distortions of Cosmic Microwave Background (CMB) temperature and polarization maps caused by gravitational lensing, observable with high angular resolution and high sensitivity, can be used to...
Holder, Gilbert, Haiman, Zoltan, Kaplinghat, Manoj, Knox, Lloyd
In light of the recent inference of a high optical depth to Thomson scattering, tau, from the WMAP data we investigate the effects of extended periods of partial ionization and ask if the value of...
Normal Parameters for an Analytic Description of the CMB Cosmological Parameter Likelihood (2002)
Chu, Mike, Kaplinghat, Manoj, Knox, Lloyd
The normal parameters are a non--linear transformation of the cosmological parameters whose likelihood function is very well--approximated by a normal distribution. This transformation serves as an...
Rapid Calculation of Theoretical CMB Angular Power Spectra (2002)
Kaplinghat, Manoj, Knox, Lloyd, Skordis, Constantinos
We have developed a fast method for predicting the angular power spectrum, C_l, of the cosmic microwave background given cosmological parameters and a primordial power spectrum of perturbations....
Testing The Friedmann Equation: The Expansion of the Universe During Big-Bang Nucleosynthesis (2001)
Carroll, Sean M., Kaplinghat, Manoj
In conventional general relativity, the expansion rate H of a Robertson-Walker universe is related to the energy density by the Friedmann equation. Aside from the present day, the only epoch at which...
How Cold Dark Matter Theory Explains Milgrom's Law (2001)
Kaplinghat, Manoj, Turner, Michael S.
Milgrom noticed the remarkable fact that the gravitational effect of dark matter in galaxies only becomes important where accelerations are less than about 10^{-8} cm s^{-2} ~ cH_0. This forms the...
Solving the Coincidence Problem: Tracking Oscillating Energy (2000)
Dodelson, Scott, Kaplinghat, Manoj, Stewart, Ewan
Recent cosmological observations strongly suggest that the universe is dominated by an unknown form of energy with negative pressure. Why is this dark energy density of order the critical density...
Kaplinghat, Manoj, Lopez, Robert E., Dodelson, Scott, Scherrer, Robert J.
A massive neutrino which decays after recombination (t > 10^{13} sec) into relativistic decay products produces an enhanced integrated Sachs-Wolfe effect, allowing constraints to be placed on such...
Constraining Variations in the Fine-Structure Constant with the Cosmic Microwave Background (1998)
Kaplinghat, Manoj, Scherrer, Robert J., Turner, Michael S.
Any time variation in the fine-structure constant alters the ionization history of the universe and therefore changes the pattern of cosmic microwave background fluctuations. We calculate the changes...
The Colloquial Landscape (1000)
Wayne Hu, Christopher Gordon, Matt Hedman, Gil Holder, Manoj Kaplinghat, Kendrick Smith, ...
gravitational waves