Jansson, Ronnie, Farrar, Glennys R., Waelkens, Andre H., Ensslin, Torsten A.
We introduce a method to quantify the quality-of-fit between data and observables depending on the large scale Galactic magnetic field. We combine WMAP5 polarized synchrotron data and Rotation...
Correlations between Ultrahigh Energy Cosmic Rays and Infrared-Luminous Galaxies (2009)
Farrar, Glennys R., Berlind, Andreas A., Zaw, Ingyin
We confirm the UHECR horizon established by the Pierre Auger Observatory using the heterogeneous Veron-Cetty Veron (VCV) catalog of AGNs, by performing a redshift-angle-IR luminosity scan using PSCz...
Correlations between Ultrahigh Energy Cosmic Rays and AGNs (2009)
Farrar, Glennys R., Zaw, Ingyin, Berlind, Andreas A.
We investigate several aspects of the correlations reported by the Pierre Auger Observatory between the highest energy cosmic rays (UHECRs) and galaxies in the Veron-Cetty Veron (VCV) catalog of...
Generalized Maximum Likelihood Method for Ultrahigh Energy Cosmic Rays (2008)
The Maximum Likelihood Method is generalized to include effects important for UHECR applications. The new approach can incorporate source distance constraints implied by the observed CR energy and...
Connection between a possible fifth force and the direct detection of Dark Matter (2008)
If there is a fifth force in the dark sector and dark sector particles interact non-gravitationally with ordinary matter, quantum corrections generically lead to a fifth force in the visible sector....
Galaxies Correlating with Ultra-high Energy Cosmic Rays (2008)
Zaw, Ingyin, Farrar, Glennys R., Greene, Jenny E.
The Pierre Auger Observatory reports that 20 of the 27 highest energy cosmic rays have arrival directions within 3.2 deg of a nearby galaxy in the Veron-Cetty & Veron Catalog of Quasars and Active...
Giant AGN Flares and Cosmic Ray Bursts (2008)
Farrar, Glennys R., Gruzinov, Andrei
We predict a new class of very intense, short-duration AGN flares capable of accelerating the highest energy cosmic rays, resulting from the tidal disruption of a star or from a disk instability. The...
Where do "red and dead" early-type void galaxies come from? (2008)
Croton, Darren J., Farrar, Glennys R.
Void regions of the Universe offer a special environment for studying cosmology and galaxy formation, which may expose weaknesses in our understanding of these phenomena. Although galaxies in voids...
Where do 'red and dead' early-type void galaxies come from? (2008)
Croton, Darren J., Farrar, Glennys R.
Void regions of the Universe offer a special environment for studying cosmology and galaxy formation, which may expose weaknesses in our understanding of these phenomena. Although galaxies in voids...
Strong CP Problem with 10^{32} Standard Model Copies (2007)
Dvali, Gia, Farrar, Glennys R.
We show that a recently proposed solution to the Hierarchy Problem simultaneously solves the Strong CP Problem, without requiring an axion or any further new physics. Consistency of black hole...
Maximum Likelihood Method for Cross Correlations with Astrophysical Sources (2007)
Jansson, Ronnie, Farrar, Glennys R.
We generalize the Maximum Likelihood-type method used to study cross correlations between a catalog of candidate astrophysical sources and Ultrahigh Energy Cosmic Rays (UHECRs), to allow for...
Large-Angular-Scale Clustering as a Clue to the Source of UHECRs (2007)
Berlind, Andreas A., Farrar, Glennys R.
We show that future Ultra-High Energy Cosmic Ray samples should be able to distinguish whether the sources of UHECRs are hosted by galaxy clusters or ordinary galaxies, or whether the sources are...
Jansson, Ronnie, Farrar, Glennys R.
We extend the Maximum Likelihood method used by HiRes to study cross correlations between a catalog of candidate astrophysical sources and Ultrahigh Energy Cosmic Rays (UHECRs), to allow for...
Large scale magnetic field of the Milky Way from WMAP3 data (2007)
Jansson, Ronnie, Farrar, Glennys R., Waelkens, Andre, Ensslin, Torsten A.
We report on initial results from a project to constrain the large-scale and turbulent magnetic fields of the Milky Way galaxy, which eventually will incorporate all of the relevant observational...
Evidence that a cluster of UHECRs was produced by a burst or flare (2007)
The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the combined published AGASA-HiRes data has a probability of ~ 2 10^-3 of occurring by chance. A first analysis of the...
A New Force in the Dark Sector? (2006)
Farrar, Glennys R., Rosen, Rachel A.
We study the kinematics of dark matter using the massive cluster of galaxies 1E0657-56. The velocity of the "bullet" subcluster has been measured by X-ray emission from the shock front, and the...
Dark Matter and the Baryon Asymmetry (2005)
Farrar, Glennys R., Zaharijas, Gabrijela
We present a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryon number created in the Big Bang. If dark matter particles carry baryon number $B_X$, and...
Flavor-singlet hybrid baryons may already have been discovered (2005)
Kittel, Olaf, Farrar, Glennys R.
The splittings between the spin 1/2 and spin 3/2 iso-singlet baryons Lambda_s(1405) and Lambda_s(1520), and their charmed counterparts Lambda_c(2593) and Lambda_c(2625), have been a theoretical...
Foreground and Source of a Cluster of Ultra-high Energy Cosmic Rays (2005)
Farrar, Glennys R., Berlind, Andreas A., Hogg, David W.
We investigate the origin of a nearly pointlike cluster of 5 ultrahigh energy cosmic rays at RA ~169.2deg and dec ~56.8deg, using Sloan Digital Sky Survey and other data. No particular source...
Late Arriving Particles in Cosmic Ray Air Showers and AGASA's Determination of UHECR Energies (2005)
Drescher, Hans-Joachim, Farrar, Glennys R.
We give the first detailed study of the arrival time distribution of nucleons in UHECR air showers. We analyze in detail the influence of late arriving particles on the energy determination of the...
A Cluster of Ultrahigh Energy Cosmic Rays (2005)
Five ultrahigh energy cosmic rays in the combined AGASA and HiRes stereo data are analyzed to test whether they come from a single source. The quad above 37 EeV in the 94-event high energy dataset...
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type (2005)
Croton, Darren J., Farrar, Glennys R., Norberg, Peder, Colless, Matthew, Peacock, John A., Baldry, I. K., ...
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type (2005)
Croton, Darren J., Farrar, Glennys R., Norberg, Peder, Colless, Matthew, Peacock, John A., Baldry, Ivan K., ...
We use the 2dF Galaxy Redshift Survey to measure the dependence of the bJ-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8 h−1 Mpc ,...
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type (2005)
Croton, Darren J., Farrar, Glennys R., Norberg, Peder, Colless, Matthew, Peacock, John A., Baldry, Ivan K., ...
We use the 2dF Galaxy Redshift Survey to measure the dependence of the bJ-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8 h−1 Mpc...
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type (2005)
Croton, Darren J., Farrar, Glennys R., Norberg, Peder, Colless, Matthew, Peacock, John A., Baldry, Ivan K., ...
We use the 2dF Galaxy Redshift Survey to measure the dependence of the bJ-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8 h−1 Mpc ,...
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type (2004)
Croton, Darren J., Farrar, Glennys R., Norberg, Peder, Colless, Matthew, Peacock, John A., Baldry, I. K., ...
We use the 2dF Galaxy Redshift Survey to measure the dependence of the bJ-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8h-1Mpc, and on...
A Window in the Dark Matter Exclusion Limits (2004)
Zaharijas, Gabrijela, Farrar, Glennys R.
We consider the cross section limits for light dark matter candidates ($m=0.4$ to 10 GeV). We calculate the interaction of dark matter in the crust above underground dark matter detectors and find...
Dark Matter and the Baryon Asymmetry of the Universe (2004)
Farrar, Glennys R., Zaharijas, Gabrijela
We present a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryon number created in the Big Bang. If dark matter particles carry baryon number $B_X$, and...
Nuclear and nucleon transitions of the H di-baryon (2003)
Farrar, Glennys R., Zaharijas, Gabrijela
We consider 3 types of processes pertinent to the phenomenology of an H di-baryon: conversion of two $\Lambda$'s in a doubly-strange hypernucleus to an H, decay of the H to two baryons, and -- if the...
Interacting Dark Matter and Dark Energy (2003)
Farrar, Glennys R., Peebles, P. J. E.
We discuss models for the cosmological dark sector in which the energy density of a scalar field approximates Einstein's cosmological constant and the scalar field value determines the dark matter...
Transitions of two baryons to the H dibaryon in nuclei (2003)
Farrar, Glennys R., Zaharijas, Gabrijela
We calculate the suppression in the rate at which two baryons in a nucleus (viz., nucleons or $\Lambda$'s) convert to an H dibaryon, using an Isgur-Karl wavefunction for quarks in the baryons and H,...
Non-binding of Flavor-Singlet Hadrons to Nuclei (2003)
Farrar, Glennys R., Zaharijas, Gabrijela
Strongly attractive color forces in the flavor singlet channel may lead to a stable H dibaryon. Here we show that an H or other compact, flavor singlet hadron is unlikely to bind to nuclei, so that...
Air Shower Simulations in a Hybrid Approach using Cascade Equations (2002)
Drescher, Hans-Joachim, Farrar, Glennys R.
A new hybrid approach to air shower simulations is described. At highest energies, each particle is followed individually using the traditional Monte Carlo method; this initializes a system of...
Drescher, Hans-Joachim, Farrar, Glennys R.
In hadron induced air showers of highest energies (E> 1e18 eV), the lateral distribution functions of electrons and muons are a superposition of many separate electromagnetic sub-showers, initiated...
Deducing the Source of Ultrahigh Energy Cosmic Rays (2000)
Farrar, Glennys R., Piran, Tsvi
The apparent lack of suitable astrophysical sources for cosmic rays with E > 10^{19.7} eV (UHECRs) is the "GZK Paradox". We argue that whatever mechanism produces them must also account for events...
Masses of Flavor Singlet Hybrid Baryons (2000)
Kittel, Olaf, Farrar, Glennys R.
We study the possibility that four iso-singlet baryons $\Lambda_s(1405)$ $J^P=1/2^{-}$, $\Lambda_s(1520)$ $J^P=3/2^{-}$, $\Lambda_c(2593)$ $J^P=1/2^{-}$ and $\Lambda_c(2625)$ $J^P=3/2^{-}$ are...
Neutron Stars with a Stable, Light Supersymmetric Baryon (2000)
Balberg, Shmuel, Farrar, Glennys R., Piran, Tsvi
If a light gluino exists, the lightest gluino-containing baryon, the \OSO, is a possible candidate for self-interacting dark matter. In this scenario, the simplest explanation for the observed ratio...
Self-Interacting Dark Matter (2000)
Wandelt, Benjamin D., Dave, Romeel, Farrar, Glennys R., McGuire, Patrick C., Spergel, David N., Steinhardt, Paul J.
Spergel and Steinhardt have recently proposed the concept of dark matter with strong self-interactions as a means to address numerous discrepancies between observations of dark matter halos on...
GZK Violation - a Tempest in a (Magnetic) Teapot? (1999)
Farrar, Glennys R., Piran, Tsvi
The apparent lack of suitable astrophysical sources for the observed highest energy cosmic rays (UHECRs) within $\approx 20$ Mpc is the "GZK Paradox". We constrain representative models of the...
Soft Yukawa couplings in supersymmetric theories (1999)
Borzumati, Francesca, Farrar, Glennys R., Polonsky, Nir, Thomas, Scott
The possibility of radiatively generated fermion masses arising from chiral flavor violation in soft supersymmetry-breaking terms is explored. Vacuum stability constraints are considered in various...
Farrar, Glennys R., Biermann, Peter L.
We discuss the rationale for the energy cuts used in the previous study of directional correlation of the five highest energy cosmic ray events with compact, radio quasars. We check the consistency...
Correlation between Compact Radio Quasars and Ultra-High Energy Cosmic Rays (1998)
Farrar, Glennys R., Biermann, Peter L.
Some proposals to account for the highest energy cosmic rays predict that they should point to their sources. We study the five highest energy events (E>10^20 eV) and find they are all aligned with...
Exotic massive hadrons and ultra-high energy cosmic rays (1998)
Albuquerque, Ivone F. M., Farrar, Glennys R., Kolb, Edward W.
We investigate the proposal that primary cosmic rays of energy above the Greisen-Zatsepin-Kuzmin cutoff are exotic massive strongly interacting particles (uhecrons). We study the properties of air...
Can Ultra High Energy Cosmic Rays be Evidence for New Particle Physics? (1998)
Candidate astrophysical acceleration sites capable of producing the highest energy cosmic rays (E > 10^{19.5} eV) appear to be at far greater distances than is compatible with their being known...
Experimental and Cosmological Implications of Light Gauginos (1997)
Gauginos may be nearly massless at tree level, with loop corrections giving a gluino mass of order 100 MeV and a photino mass of order 1 GeV. Relic photinos can naturally account for the observed...
Status of Light Gaugino Scenarios (1997)
I summarize recent devlopments in supersymmetry scenarios which leave some or all gauginos light. The emphasis is on experimental and phenomenological progress in the past year.
Are Light Gluinos Dead? (1997)
Not yet. ALEPH's recent exclusion limit employs an aggressive determination of theoretical uncertainties using a simplified application of the Bayesian method. The validity of their analysis can be...
Are ultrahigh energy cosmic rays signals of supersymmetry? (1997)
Chung, Daniel J. H., Farrar, Glennys R., Kolb, Edward W.
We investigate the possibility that cosmic rays of energy larger than the Greisen-Zatsepin-Kuzmin cutoff are not nucleons, but a new stable, massive, hadron that appears in many extensions of the...
e+ e- Cross Section and Exclusion of Massless Electroweak Gauginos (1997)
Measurements of the total hadronic cross section in e+e- annihilation are shown to be capable of severely limiting the possibility that gauginos have negligible tree level masses. A combined analysis...
Dark Matter and Cosmic Rays from Light Gauginos (1997)
An attractive class of SUSY-breaking mechanisms predicts a photino mass of order 1 GeV. Relic photinos can naturally account for the observed dark matter. Detection of these light photinos is...
SUSY Breaking and Light Gauginos (1997)
Several supersymmetry breaking mechanisms do not produce dimension-3 operators. I show here that this scenario is consistent with present observations and has several significant virtues: i) When...
On the relic abundance of light photinos (1997)
Chung, Daniel J. H., Farrar, Glennys R., Kolb, Edward W.
We solve the coupled Boltzmann equation for the system of light photinos interacting with pions and $R^0$'s (the gluon-gluino bound state) to determine the relic abundance of light photinos in the...
Determining the Gluonic Content of Isoscalar Mesons (1996)
The gluonic widths of four leading glueball candidates are determined from their production in radiative quarkonium decays, allowing quantitative estimation of their glue content. Lattice predictions...
The tree-level-massless gaugino scenario predicts that the lighter chargino mass is less than m_W and that gluino and lightest neutralino masses are $\lsi 1$ GeV. In this case the dominant decay mode...
SUSY and the Electroweak Phase Transition (1996)
Farrar, Glennys R., Losada, Marta
We analyze the effective 3 dimensional theory previously constructed for the MSSM and multi-Higgs models to determine the regions of parameter space in which the electroweak phase transition is...
Determining the Gluonic Content of Isoscalar Mesons (1996)
Close, Frank E., Farrar, Glennys R., Li, Zhenping
We develop tools to determine the gluonic content of a resonance of known mass, width and $J^{PC}$ from its branching fraction in radiative quarkonium decays and production cross section in $\gamma...
Phenomenology of Charginos and Neutralinos in the Light Gaugino Scenario (1996)
The light gaugino scenario predicts that the lighter chargino mass is less than m_W, gluino and lightest neutralino masses are
Light Gluino Mass and Condensate from Properties of $\eta$ and $\eta'$ (1996)
Farrar, Glennys R., Gabadadze, G. T.
We investigate whether known properties of the $\eta'$ meson are consistent with its being the Goldstone boson of the spontaneously broken anomaly-free R symmetry required in the light gluino...
Detecting Gluino-Containing Hadrons (1996)
When SUSY breaking produces only dimension-2 operators, gluino and photino masses are of order 1 GeV or less. The gluon-gluino bound state has mass 1.3-2.2 GeV and lifetime > 10^{-5} - 10^{-10} s....
Signatures for Squarks in the Light Gaugino Scenario (1996)
When the gluino is light and long lived, missing energy is a poor signature for both squarks and gluinos. Instead, squark pair production leads to events with $\ge 4$ jets. If a chargino can decay to...
New Signatures of Squarks (1995)
When the gluino is light and long lived, missing energy is a poor signature for both squarks and gluinos. Instead, $S_q S_q^*$ production in $e^+ e^-$ and $p \bar{p}$ collisions characteristically...
Phenomenology of Light Gauginos: II. Experimental Signatures (1995)
When SUSY breaking produces only dimension-2 terms in the minimal supersymmetric standard model, the parameters of the theory can be rather well constrained. This paper deals with strategies for the...
Phenomenology of Light Gauginos: I. Motivation, Masses, Lifetimes and Limits (1995)
I explore an economical variant on supersymmetric standard models which may be indicated on cosmological grounds and is shown to have no SUSY-CP problem. Demanding radiative electroweak symmetry...
LIGHT PHOTINOS AS DARK MATTER (1995)
Farrar, Glennys R., Kolb, Edward W.
There are good reasons to consider models of low-energy supersymmetry with very light photinos and gluinos. In a wide class of models the lightest $R$-odd, color-singlet state containing a gluino,...
Phenomenology of Light Gauginos (1995)
I advocate the virtues of a very economical version of the minimal supersymmetric standard model which avoids cosmological problems often encountered in dynamical SUSY-breaking and solves the SUSY-CP...
Scattering from a Domain Wall in a Spontaneously Broken Gauge Theory (1994)
Farrar, Glennys R., McIntosh, John W.
We study the interaction of particles with a domain wall at a symmetry-breaking phase transition by perturbing about the domain wall solution. We find the particulate excitations appropriate near the...
Radiative Gaugino Masses (1994)
Farrar, Glennys R., Masiero, Antonio
We investigate the possibility that gauginos are massless at tree level and that the U(1) R-invariance is broken spontaneously by Higgs vevs, like the chiral symmetry of quarks in the standard model,...
Gluino and lightest neutralino masses are naturally less than a few GeV if dimension-3 susy-breaking operators are absent from the low energy theory. In this case gaugino masses come from loops and...
Experiments to Find or Exclude a Long-Lived, Light Gluino (1994)
Gluinos in the mass range ~1 1/2 - 3 1/2 GeV are absolutely excluded. Lighter gluinos are allowed, except for certain ranges of lifetime. Only small parts of the mass-lifetime parameter space are...
Baryon Asymmetry of the Universe in the Minimal Standard Model (1993)
Farrar, Glennys R., Shaposhnikov, M. E.
We calculate the baryon asymmetry of the Universe which would arise during a first order electroweak phase transition due to minimal standard model processes. It agrees in sign and magnitude with the...
Baryon Asymmetry of the Universe in the Standard Model (1993)
Farrar, Glennys R., Shaposhnikov, M. E.
We study the interactions of quarks and antiquarks with the changing Higgs field during the electroweak phase transition, including quantum mechanical and some thermal effects, with the only source...
Farrar, Glennys R., Jackson, Darrell R.
We give the normalized leading asymptotic Q2 dependence of the pion form factor in quantum chromodynamics: Fπ(Q2)→Q2→±∞-2fπ2/bQ2ln|Q2|, where fπ is the pion decay constant and...
Constituent description of NN elastic scattering observables at large angles (1979)
Farrar, Glennys R., Gottlieb, Steven, Sivers, Dennis, Thomas, Gerald H.
We suggest that the constituent picture of nucleon-nucleon elastic scattering can be tested by the spin-correlation measurements All, Ass, Ann, and Asl. These measurements provide a means for...
Copious Direct Photon Production: A Possible Resolution of the Prompt-Lepton Puzzle (1975)
Farrar, Glennys R., Frautschi, Steven C.
We propose that all direct leptons not due to vector meson decay can be attributed to the decay of virtual photons. At p⊥≈3 GeV/c, we expect γ / π, the ratio of direct photons to pions, to be...
Scaling laws for large-momentum-transfer processes (1975)
Brodsky, Stanley J., Farrar, Glennys R.
Dimensional scaling laws are developed as an approach to understanding the energy dependence of high-energy scattering processes at fixed center-of-mass angle. Given a reasonable assumption on the...
Leakage of quark charge (1974)
Farrar, Glennys R., Rosner, Jonathan L.
A sequential model for the fragmentation of a quark into hadrons is constructed with the property that a net charge 2 "leaks" down the multiperipheral chain. Specifically, for a process initially...
Particle ratios in energetic hadron collisions (1974)
Bjorken, James D., Farrar, Glennys R.
We construct a simple statistical model in order to estimate, for very energetic collisions, the ratios of particles with various quantum numbers produced with center-of-mass momenta less than a few...
Scaling laws at large transverse momentum (1973)
Brodsky, Stanley J., Farrar, Glennys R.
The application of simple dimensional counting to bound states of pointlike particles enables us to derive scaling laws for the asymptotic energy dependence of electromagnetic and hadronic scattering...