We present latest results of searches for WIMP dark matter from the UKDMC experiments at Boulby mine. Included is analysis of anomalous events seen in bulk NaI detectors with relevance to results from the DAMA and CDMS experiments. We describe progress with liquid Xe and direction sensitive detectors currently under construction, including assessment of sensitivity to neutralino candidates and prospects for detecting the WIMP wind.
Authors:N.J.C. Spooner (for UKDMC)
Proposed speaker: N.J.C. Spooner
Contact person:Neil JC Spooner
(University of Sheffield),
n.spooner@sheffield.ac.uk
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers:
Notes:
The L3+C experiment takes advantage of the unique properties of the L3 muon spectrometer at LEP to get an accurate measurement of cosmic ray muons 30 m underground from 20 to 2000 GeV/c. During last year's six month's run 5x10**9 events have been recorded. Currently, a part of these events have been reconstructed. Preliminary results about the momentum dependence of the vertical muon flux and the muon charge ratio as well as the muon multiplicity will be presented.
Authors:L3 collaboration
Proposed speaker: Thomas Hebbeker
Contact person:Thomas Hebbeker
(Humboldt University Berlin),
hebbeker@physik.hu-berlin.de
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers:
Notes:
I review the present status of Affleck-Dine baryogenesis in the MSSM with gravity-mediated SUSY breaking, with special emphasis on the role of Q-balls of baryon number (B-balls) in explaining the baryon asymmetry and neutralino dark matter density in Universe at present.
Authors:John McDonald
Proposed speaker: John McDonald
Contact person:Kari Enqvist
(Helsinki University),
enqvist@rock.helsinki.fi
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: 1) Q-balls and baryogenesis in the MSSM (with K.Enqvist). Phys.Lett. B425 (1998) 309. 2) B-ball baryogenesis and the baryon to dark matter ratio (with K.Enqvist). Nucl.Phys. B538 (1999) 321. 3) MSSM dark matter constraints and decaying B-balls (with K.Enqvist). Phys.Lett. B440 (1998) 59. 4) Supersymmetric D-term inflation and B-ball baryogenesis (with K.Enqvist). Phys.Rev.Lett. 81 (1998) 3071. 5) Observable isocurvature fluctuations from the Affleck-Dine condensate (with K.Enqvist). Phys.Rev.Lett. 83 (1999) 2510. 6) The Dynamics of Affleck-Dine Condensate Collapse. (with K.Enqvist) Nucl. Phys. B570 (2000) 407. 7) Inflationary Affleck-Dine Scalar Dynamics and Isocurvature Perturbations, hep-ph/9912478. To be published in Phys.Rev.D.
Notes:
Annihilations of high-energy neutrinos on the background relic neutrinos, with masses in the range inferred from the Super-Kamiokande results, can explain the puzzle of ultra-high energy cosmic rays.
Authors:Alexander Kusenko
Proposed speaker: Alexander Kusenko
Contact person:Alexander Kusenko
(UCLA),
kusenko@ucla.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: 1) Gelmini and Kusenko, Phys.Rev.Lett.84:1378,2000 2) Gelmini and Kusenko, Phys.Rev.Lett.82:5202,1999
Notes: 5/16/00 Kubota/TY- Put this as second choice. Chose #338 as the first choice. (PA-08)
Current dark matter experiments (e.g. DAMA and CDMS) are now sensitive enough to probe neutralino-proton cross sections in the range (1-10)x10^(-6)pb. We investigate here what parts of the SUSY parameter space is being tested for a range of models: mSUGRA (universal soft breaking), nonuniversal SUGRA (in both the Higgs and third generations) and D-brane models (with nonuniversal gaugino masses). A full analysis is given, e.g. 2<tanb<50 including accelerator and cosmological constraints, quark/lepton mass loops, etc. Thus data now probes tanb>25 for mSUGRA, tanb>4 for nonuniversal SUGRA and tanb>15 for D-brane models, and expected SUSY particle masses, etc. for these ranges are discussed.
Authors:E. Accomando, R. Arnowitt, B. Dutta, and Y. Santoso
Proposed speaker: R. Arnowitt
Contact person:Richard L. Arnowitt
(Texas A&M University),
arnowitt@physics.tamu.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: E. Accomando, R. Arnowitt, B. Dutta and Y. Santoso, hep-ph/0001019
Notes:R. Arnowitt, B. Dutta and Y. Santoso, Dark matter and D-Branes, in prepration.
A large-scale experiment has been constructed and operated to search for axions constituting our galactic dark matter halo. The experiment is based on the resonant conversion of axions to photons in a microwave cavity permeated by a magnetic field [1]. This experiment has run for several years at >90% duty factor, and achieved sensitivity to realistic axion models for masses in the microelectronvolt range [2]. The experiment is now operating with a multiple-cavity array for higher frequencies. A major upgrade is planned, enabled by a breakthrough in making near-quantum limited gigahertz amplifiers based on SQUID technology [3-5].
Authors:MIT – LLNL – Univ. Florida – FNAL – Univ. Chicago – LBNL – U.C. Berkeley – INR
Proposed speaker: Karl van Bibber
Contact person:Karl A. van Bibber
(Lawrence Livermore National Laboratory),
vanbibber1@llnl.gov
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers: [1] P. Sikivie, Phys. Rev. Lett. 51, 1415 (1983) [2] C. Hagmann et al., Phys. Rev. Lett. 80, 2043 (1998) [3] M. Muck et al., Appl. Phys. Lett. 72, 2885 (1998) [4] M. Muck et al., Appl. Phys. Lett. 75, 698 (1999) [5] M. Muck et al., Appl. Phys. Lett. 75, 3545 (1999)
Notes:I am hopeful that Prof. Seishi Matsuki will submit a paper on the Kyoto Sikivie-type experiment, utilizing a Rydberg-atom single-quantum detector as the back end. If so, it may be interesting to put the two talks back-to-back in the schedule. Otherwise, a few transparencies could be added to this talk to summarize their very beautiful and powerful technique.
We discuss the effect of the CMBR on the Van-der-Waals interactions among molecules and of the relic neutrinos on the 2-neutrino-exchange forces among bulk matter. Also, we explore Bose-Einstein condensation effects on 2-scalar-exchange interactions among bodies sitting in relic light scalar dark matter. Below the critical temperature, the range of these forces become infinite while it is finite at temperatures above condensation.
Authors:F. FERRER AND J.A. GRIFOLS
Proposed speaker: J.A. GRIFOLS
Contact person:J.A. GRIFOLS
(Universitat Autonoma de Barcelona),
grifols@ifae.es
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: "Casimir-Polder forces in the presence of the photon cosmic heat bath", Phys. Lett.B460, 122(1999) "Long-range neutrino forces in the cosmic relic neutrino background", Phys. Rev.D61, 057304(2000) "Effects of Bose-Einstein condensation on forces among bodies sitting in a boson heat bath", hep-ph/0001185, to appear in PRL
Notes:
We report on new calculations of the relic density and detection rate of neutralino dark matter. The relic density can be reduced by 2 orders of magitude through co-annihilation with scalar top squarks; in particular, scenarios with very small neutralino-stop mass splitting are cosmologically disfavored for neutralino masses of current interest. We also compute (S)QCD corrections to spin-independent neutralino-nucleus couplings; these can change the cross section by a factor of three or more.
Authors:Celine Boehm, Abdelhak Djouadi and Manuel Drees
Proposed speaker: Manuel Drees
Contact person:Manuel Drees
(TU Munich),
Drees@physik.tu-muenchen.de
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: hep-ph/9911504, by C. Boehm, A. Djouadi and M. Drees; hep-ph/0004205, by A. Djouadi and M. Drees.
Notes:
The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 in a 51.7 degree orbit at altitudes between 320 and 390 km. A total of 2,860,000 He nuclei were observed in the rigidity range 1 to 140 GV. No antihelium nuclei were detected at any rigidity. An upper limit on the flux ratio of antihelium to helium less than 1.1 X 10-6 is obtained
Authors:AMS Collaboration
Proposed speaker: V. Choutko
Contact person:Yuri Galalktionov
(CERN),
yuri.galalktionov@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers: Phys. Lett. B461 ( 2 Sep 1999) 387-396
Notes:
The proton spectrum in the kinetic energy range 0.1 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS--91 at an altitude of 380 km. Above the geomagnetic cutoff the observed spectrum is parameterized by a power law. Below the geomagnetic cutoff a substantial second spectrum was observed concentrated at equatorial latitudes with a flux of 70 (m^2 sec sr )^-1. Most of these second spectrum protons follow a complicated trajectory and originate from a restricted geographic region.
Authors:AMS Collaboration
Proposed speaker: V. Choutko
Contact person:Yuri Galalktionov
(CERN),
yuri.galalktionov@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers: Phys. Lett. B472 (26 Jan 2000) 215-226
Notes:
The lepton spectra in the kinetic energy ranges 0.2 to 40\,\GeV\ for e$^-$ and 0.2 to 3\,\GeV\ for e$^+$ were measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS--91 at altitudes near 380\,km. From the origin of the leptons two distinct spectra were observed: a higher energy spectrum and a substantial second spectrum with positrons much more abundant than electrons. Tracing leptons from the second spectra shows that most of these leptons travel for an extended period of time in the geomagnetic field and that the e$^+$ and e$^-$ originate from two complementary geographic regions.
Authors:AMS Collaboration
Proposed speaker: V. Choutko
Contact person:Yuri Galaktionov
(CERN),
Iouri.Galaktionov@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:
The helium spectrum over the kinetic energy range 0.1 to 100 GeV/nucleon was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS--91 at altitudes near 380 km. Above the geomagnetic cutoff the spectrum is parameterized by a power law. Below the geomagnetic cutoff a second helium spectrum was observed. Over the energy range 0.1 to 1.2 GeV/nucleon the flux was measured to be (6.9 +- 0.9) X 10^{-3}( m^2 sr sec )^-1 At the 90 % CL, over 0.9 of the helium was determined to be He-3.
Authors:AMS Collaboration
Proposed speaker: V. Choutko
Contact person:Yuri Galaktionov
(CERN),
Iouri.Galaktionov@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:
The production of fast neutrons(1 MeV- 1 GeV) in high energy muon-nucleon interactions is poorly understood. Yet it is fundamental to the understanding of the background in many underground experiments. The aim of the NA55 experiment is to measure the cross-section for fast neutron production by the interaction of 190 GeV/c muons on different targets. A preliminary analysis based on a graphite target leads to the cross-section and to the energy spectrum.
Authors:NA55 collaboration
Proposed speaker: V. CHAZAL
Contact person:Verene CHAZAL
(Institut de Physique de Neuchatel),
verene.chazal@iph.unine.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers:
Notes:
The international Pierre Auger Project will measure the cosmic ray energy spectrum and arrival direction distribution above 10^19eV as a function of the mass of the primaries. Current experiments have proved the existence of particles with such high energy, but due to the low event rate no satisfying explanation for the acceleration mechanism and the particle origin are known. The collaboration will solve this problems by a combination of water cerenkov and fluorescence detector stations spread over an area of 3000km^2 in Argentina. We present the design of the experiment with emphasis on the fluorescence detector electronics and readout system.
Authors:AUGER collaboration
Proposed speaker: Dr. Matthias Kleifges
Contact person:Matthias Kleifges
(Forschungszentrum Karlsruhe),
matthias.kleifges@bk.fzk.de
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16a Experimental Particle Astrophysics (High Energy Particles from the Universe)
Supporting papers:
Notes:Please provide 15-20 min for my talk, otherwise I will withdraw my talk.
The CELESTE experiment uses the heliostats of a former solar plant in the French Pyrenees to detect gamma ray air showers by the atmospheric Cerenkov technique in the energy range from 30 to 300 GeV. CELESTE has been operating since November 1999 with an array of 40 heliostats fully instrumented with 1GHz flash ADCs. Significant advances have been made in the understanding of the detector, in its simulation and in the data analysis techniques. Based on these, we report on results from recent observations of the Crab nebula and the blazar Markarian 421 above an energy threshold of 50 GeV.
Authors:CELESTE collaboration
Proposed speaker: Philippe Bruel
Contact person:Philippe Bruel
(Ecole Polytechnique),
Philippe.Bruel@poly.in2p3.fr
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16a Experimental Particle Astrophysics (High Energy Particles from the Universe)
Supporting papers: in preparation
Notes:
The UK Dark Matter Collaboration is developing a series of liquid Xe detectors to search for the hypothetical weakly interacting massive particles (WIMPs) which may comprise a significant component of the Galactic dark matter. These detectors will be operated at a depth of 1100m in the Boulby salt mine. The current status will be discussed of the first of these detectors, ZEPLIN I, a 1.7 litre single phase liquid Xe scintillation detector which employs pulse shape discrimination to distinguish nuclear recoils due to WIMPs from electron recoils due to background gamma interactions.
Authors:UK Dark Matter Collaboration
Proposed speaker: Nigel J. T. Smith
Contact person:Nigel JT Smith
(Rutherford Appleton Laboratory),
n.j.t.smith@rl.ac.uk
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers:
Notes:
A new model is proposed to explain the main features of the cosmic ray spectrum in the energy range 10^15 eV- 10^18 eV. In this approach the so called "KneeI" and "KneeII" are due to the interaction of cosmic rays with massive neutrinos in the Galactic Halo. Limits on the mass and the dipole moment of the neutrinos are presented.
Authors:M.T.Dova, L. N.Epele and J.D. Swain
Proposed speaker: M.T.Dova
Contact person:Maria T. DOVA
(Universidad Nacional de La Plata),
dova@fisica.unlp.edu.ar
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:
The HEGRA collaboration is operating a system of five stereoscopic Imaging Atmopheric Cherenkov Telescopes on the Canary Island of La Palma since the end of 1996. The system allows the observation of cosmic TeV gamma-rays with an angular resolution of 0,1$^\circ$ and an energy resolution of 15\% (for single photons) above an energy threshold of 500 GeV. The effective detection area is $>$ 10$^5$~m$^2$. In this contribution we report on recent results of observations of Galactic and extragalactic sources, in particular the BL-Lac objects Mkn~421 and Mkn~501 and the supernova remnant Cas-A, and discuss the astrophysical implications of the results for the observed nonthermal systems. Multiwavelength campaign results with RXTE and Bepposax of the BL-Lac sources will be emphasized.
Authors:Antje Kohnle, on behalf of the HEGRA collaboration
Proposed speaker: Antje Kohnle
Contact person:Antje Kohnle
(MPI fuer Kernphysik),
Antje.Kohnle@mpi-hd.mpg.de
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16b Experimental Particle Astrophysics (Low Energy Particles from the Universe)
Supporting papers:
Notes:
The Soudan 2 tracking calorimeter has been used to observe the cosmic ray shadows of the sun and the moon for the 11-year interval January 1989 to December 1999. The time-independent lunar shadow indicates that the detector angular resolution is <0.3 degrees and the detector absolute pointing is <0.15 degrees. In contrast, the solar shadow is time-dependent. Its characteristics can be correlated with properties of both the solar and the interplanetary magnetic fields.
Authors:Soudan 2 Collaboration
Proposed speaker: M. L. Marshak
Contact person:Marvin L Marshak
(University of Minnesota),
marshak@umn.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16a Experimental Particle Astrophysics (High Energy Particles from the Universe)
Supporting papers:
Notes:
The GLAST mission is expected to offer enormous opportunities for unraveling the acceleration mechanism behind AGN jets, pulsars, gamma-ray bursts, solar flares, and yet unidentified high energy objects. It also has an outstanding capability in probing supersymmetric dark matter particles and density of IR photons emitted by star-formation in the early Universe. The Large Area Telescope, the main instrument in the mission, consists of 16 identical towers. One tower is devided into a silicon tracker section made of large-format single-sided silicon stip detectors and lead converters, and an imaging calorimeter section made of finely segmented CsI(Tl) crystals and photodiodes. The readout electronics includes low-noise VLSI with 200uW/ch power consumption.
Authors:GLAST Large Area Telescope Collaboration
Proposed speaker: Tuneyoshi KAMAE
Contact person:Tuneyoshi Kamae
(Stanford Linear Accelerator Center),
kamae@slac.stanford.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:
Observations by the CAT Cherenkov imaging telescope of the Very High Energy (VHE) emission (above 250 GeV) from the blazar Markarian 421 since December 1996 are presented. The source variability, light curve, and differential spectra have been studied. CAT observations indicate a simple power-law spectrum at TeV energies, with a differential spectral index of 2.96 +/- 0.13. These results from Mkn 421 are compared with those from the BL Lac Mkn 501. We also discuss a correlated variability between VHE gamma-ray and X-ray emissions.
Authors:CAT collaboration
Proposed speaker: J.P. Tavernet
Contact person:Jean-Paul Tavernet
( LPNHE Paris VI-VII
),
tavernet@in2p3.fr
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-16a Experimental Particle Astrophysics (High Energy Particles from the Universe)
Supporting papers:
Notes:
We examine the hypothesis that at least some of the highest energy cosmic rays may be nuclei heavier than iron. While such nuclei have long been assumed insignificant, we argue that this assumption is not justified, and that present data already offer hints that this is the case. We discuss possible sources and acceleration mechanisms, as well as experimental prospects for definitive tests.
Authors:L.A. Anchordoqui, M.T. Dova, T.P. McCauley, S. Reucroft, J.D. Swain
Proposed speaker:
Contact person:John D Swain
(Northeastern University),
john.swain@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers: UNMASKING THE TAIL OF THE COSMIC RAY SPECTRUM, astro-ph/9912081 More work is in papers in preparation.
Notes:
Grand unified theories (GUTs) are an attempt to unify the fundamental forces of nature. One of the important predictions of these theories is proton or bound neutron instability. By incorporating the recent evidence for neutrino mass, recent supersymmetric (SUSY) theories predict a nucleon lifetime within the observable range of Super-Kamiokande. We will present the results of searches for various nucleon decay modes using the most recent data sample of the Super-Kamiokande water Cherenkov detector.
Authors:Super-Kamiokande
Proposed speaker: Matthew Earl
Contact person:Matthew A Earl
(Boston University),
earl@budoe.bu.du
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
Non-abelian discrete gauge symmetries can provide the inflaton with a flat potential even when one takes into account gravitational strength effects. The discreteness of the symmetries also provide special field values where inflation can end via a hybrid type mechanism. An interesting feature of this method is that it can naturally lead to extremely flat potentials and so, in principle, to inflation at unusually low energy scales. Two examples of effective field theories with this mechanism are given, one with a hybrid exit and one with a mutated hybrid exit. They include an explicit example in which the single field consistency condition is violated.
Authors:E. D. Stewart and J. D. Cohn
Proposed speaker: E. D. Stewart
Contact person:Ewan D Stewart
(KAIST),
ewan@kaist.ac.kr
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:
A finite cosmological constant as reported by recent cosmological data suffers from two problems: why it has become important just now ("why now" problem), and why it is comparble to both matter and radiation energy densities (triple coincidence problem). We propose a solution to the triple coincidence problem assuming that the cosmological constant is tied to the electroweak symmetry breaking. We then find that the triple coincidence is inevitable, which is split only by a factor of alpha^-2 which causes a brief period of matter domination. This in term gives a significant insight to the "why now" problem as well.
Authors:Nima Arkani-Hamed, Christopher Kolda, Lawrence Hall, Hitoshi Murayama
Proposed speaker: Hitoshi Murayama
Contact person:Hitoshi Murayama
(University of California),
murayama@lbl.gov
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:
Since 1993, the balloon-borne BESS spectrometer has been launched from Lynn Lake, Canada, to collect cosmic-ray data at the top of the atmosphere. The recent results from BESS are presented. (1) The most sensitive search for cosmic-ray anti-helium nuclei. (2) The absolute energy spectrum of cosmic-ray antiprotons based on more than 800 antiprotons accumulated during balloon flights from 1993 to 1998. (3) The cosmic-ray proton and helium spectra in the energy range 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively. (4) The absolute flux of sea level atmospheric muons and the muon charge ratio at different geomagnetic locations.
Authors:BESS Collaboration
Proposed speaker: Mitsuaki Nozaki
Contact person:Mitsuaki Nozaki
(Kobe Univ.),
nozaki@phys.sci.kobe-u.ac.jp
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:
Recent cosmological observations suggest the presence of small but nonzero cosmological constant \simeq (2 \times 10^{-3} eV)^4. It is an intriguing possibility that such a small cosmological constant is supplied by the potential energy density of an ultralight axion-like field called as quintessence axion. If this axion couples to the electroweak gauge fields, its potential may be generated by the electroweak instanton effects. We calculate the axion potential assuming the supersymmetric standard model and obtain a result that the induced energy density of the quintessence axion field is very close to the value suggested from the observations.
Authors:Yasunori Nomura, Taizan Watari, Tsutomu Yanagida
Proposed speaker: Yasunori Nomura
Contact person:Yasunori Nomura
(University of Tokyo),
yasunori@hep-th.phys.s.u-tokyo.ac.jp
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-10 Recent Progress in Field Theory
Supporting papers: Y.Nomura, T.Watari and T.Yanagida, hep-ph/0004182.
Notes:
We investigate the leptogenesis to generate the baryon asymmetry of the present universe in the framework of supersymmetry. We consider the the leptogenesis via decays of heavy Majorana neutrinos which are produced non-thermally in inflaton decays. We make a comprehensive study on the leptogenesis assuming various models for the primordial inflation. We find that it is successful to produce the lepton asymmetry enough to explain the baryon number in the present universe. The reheating temperature of the inflation can be taken as $T_R \lesssim 10^8$ GeV, and hence we can avoid the cosmological gravitino problem.
Authors:T. Asaka, K. Hamaguchi, M. Kawasaki, and T. Yanagida
Proposed speaker: Takehiko Asaka
Contact person:Takehiko Asaka
(University of Tokyo),
asaka@hep-th.phys.s.u-tokyo.ac.jp
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: Physical Review D61, 083512 (2000); Physics Letters B464, 12 (1999)
Notes:
We investigate the cosomological garavitino problem in gauge-mediated supersymmetry breaking models. We consider the case in which the lighter stau is the next-to-lightest supersymmetric particle and derive cosmological constraints on the decay of the stau from the big-bang nucleosynthesis. We obtain a lower bound on the mass of stau, which is more stringent than the current experimental limit 90 GeV for the gravitino mass region m_{3/2} > 5 GeV. This lower bound and the overclosure constraint on the stable gravitino give an upper bound on the reheating temperature T_R. We find that T_R can be as high as 10^9 - 10^10 GeV for m_{3/2} = 5 - 100 GeV.
Authors:T.Asaka, K.Hamaguchi and K.Suzuki
Proposed speaker: Koichi Hamaguchi
Contact person:Koichi Hamaguchi
(University of Tokyo),
hama@hep-th.phys.s.u-tokyo.ac.jp
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:
The Cryogenic Dark Matter Search (CDMS) employs Ge and Si detectors which are sensitive to WIMPS and but which are also able to identify and reject many backgrounds. Our current data does not confirm most of the allowed region reported by DAMA. Our projections for future sensitivity are discussed.
Authors:CDMS
Proposed speaker: Harry Nelson
Contact person:Harry N. Nelson
(UCSB),
hnn@hep.ucsb.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-09 Beyond the Standard Model
Supporting papers: http://arXiv.org/abs/astro-ph/0002471
Notes:
If the measure of integration in the action is allowed to be independent of the metric, one finds naturally models where the energy density of the ground state is zero. The requirement of scale invariance is consistent with realistic potentials for a dilaton field and the induced gravity model of Zee, which is a successful model for inflation can be obtained after ssb of scale invariance. Fermion masses and their relevance to the cosmic coincidences problem and the possibility of a transition from inflation to a slowly accelera- ted phase, as in the present universe, are discussed.
Authors:E.I.Guendelman
Proposed speaker: E.I.Guendelman
Contact person:Eduardo I. Guendelman
(Ben Gurion University of the Negev P.O.Box: 653),
guendel@bgumail.bgu.ac.il
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes:Some references are, E.I.Guendelman, gr-qc/0004011 (con- tribution to the Moriond conference "Energy densities in the Universe", January 2000); E.I.Guendelman, Mod. Phys. Lett. A14, 1397 (1999); A14, 1043 (1999); E.I.Guendelman, gr-qc/9901067; E.I.Guendelman, Class. Quantum Grav. 17, 261 (2000). (006)
We calculate the thermodynamic variables in the stellar media. We work in the stellar cores of hot highly dense rotating stars which generate the strong magnetic due to the gravitational effects. We try to find a self consistent magnetization condition for these type of media also.We show that if the degenerate electron gas is confined to its Landau ground state, its transverse pressure will vanish.
Authors:Samina S.Masood
Proposed speaker: Samina S. Masood
Contact person:Samina S names) Masood
(Quaid-i-Azam University, Islamabad, Pakistan (example: Osaka Univ.)),
saminamasood@hotmail.com
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:Visiting USA on leave of absence from the home institue. So please contact me by e-mail or by fax. (016)
We calculate the crossections of leptons in hot and dense background. We have investigated a quick method to evaluate these background effects for stellar objects and in the early universe. The effect of massive neutrino background has also been incorporated in these calculations. We mention the relevance of these calculations to astroparticle physics and cosmology also.
Authors:Samina S.Masood
Proposed speaker: Samina S. Masood
Contact person:Samina S names) Masood
(Quaid-i-Azam University, Islamabad, Pakistan. Osaka Univ.) Present Address:),
saminamasood@hotmail.com
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:I am on leave of absence from my home institute so kindly consider address in USA for further contact or my e-mail. thanks (020)
We present a treatment of the homogeneous and isotropic Friedmann minisuperspace model, with minimally coupled scalar fields, using Feynman's summation-over- histories approach. The result of explicit path integration and the application to similar models are discussed.
Authors:Christopher C. Bernido
Proposed speaker: Christopher C. Bernido
Contact person:Christopher C. Bernido
(Central Visayan Institute),
cbernido@mozcom.com
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers:
Notes: (034)
Scalar particles might be in the Universe as diffuse gas clouds of objects and might so even be present in the D-stars. The quantum field configurations in the early universe are very rich. Besides topologically or dynamically stable configurations, hybrid configurations may exist including D-star. D-stars are the compact objects with a solid deficit, which generalize Q-stars by including a complex scalar field (or fermion field), the Goldstone field and classical Einstein gravity.
Authors:Xin-zhou Li, Ji-zong Lu and Xiang-hua Zhai
Proposed speaker: Ji-zong Lu
Contact person:Ji-zong LU
(Shanghai Teachers University),
jzlu@shtu.edu.cn
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) / PL-17 Particle Physics and Cosmology
Supporting papers: 1. X.Z. Li and X.H. Zhai, Phys. Lett. B364 (1995)212; 2. J.M. Li and X.Z. Li, Chin. Phys. Lett. 15 (1998); 3. X.Z. Li et al., Astropart. Phys. 13 (2000) 245
Notes:Attached a copy of full abstract which was written in "latex" version for your reference. (113)
Authors:Andrew Jaffe
Proposed speaker:
Contact person:Andrew Jaffe
(),
jaffe@cfpa.Berkeley.EDU
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:6/14/00 TY-No abstract, but was in the program.
Authors:
Proposed speaker:
Contact person:Mamoru Kawasaki
(),
kawasaki@cc.gifu-u.ac.jp
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:6/14/00 TY-No abstract, but was in the program.
Authors:V. Choutko
Proposed speaker:
Contact person:V. Choutko
(),
vitaly.choutko@cern.ch
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:6/14/00 TY-No abstract, but was in the program.
Authors:K. Olive
Proposed speaker:
Contact person:Keith A. Olive
(),
olive@umn.edu
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:6/14/00 TY- No abstract, but was in the program.
Authors:J.F. Glicenstejn
Proposed speaker:
Contact person:J. F. Glicenstejn
(),
glicens@hep.saclay.cea.fr
Sessions: PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino ) /
Supporting papers:
Notes:6/14/00 TY-No abstract, but was in the program.
End of abstracts for PA-09 Particle Astrophysics and Cosmology ( excluding Neutrino )