scispace - formally typeset
Search or ask a question
Author

Michael Levi

Other affiliations: University of California, Berkeley, CERN, Stanford University  ...read more
Bio: Michael Levi is an academic researcher from Lawrence Berkeley National Laboratory. The author has contributed to research in topics: Dark energy & Telescope. The author has an hindex of 39, co-authored 173 publications receiving 11660 citations. Previous affiliations of Michael Levi include University of California, Berkeley & CERN.


Papers
More filters
Posted Content
René J. Laureijs, Jérôme Amiaux, S. Arduini1, J.-L. Auguères  +217 moreInstitutions (14)
TL;DR: Euclid as mentioned in this paper is a space-based survey mission from the European Space Agency designed to understand the origin of the universe's accelerating expansion, using cosmological probes to investigate the nature of dark energy, dark matter and gravity by tracking their observational signatures.
Abstract: Euclid is a space-based survey mission from the European Space Agency designed to understand the origin of the Universe's accelerating expansion. It will use cosmological probes to investigate the nature of dark energy, dark matter and gravity by tracking their observational signatures on the geometry of the universe and on the cosmic history of structure formation. The mission is optimised for two independent primary cosmological probes: Weak gravitational Lensing (WL) and Baryonic Acoustic Oscillations (BAO). The Euclid payload consists of a 1.2 m Korsch telescope designed to provide a large field of view. It carries two instruments with a common field-of-view of ~0.54 deg2: the visual imager (VIS) and the near infrared instrument (NISP) which contains a slitless spectrometer and a three bands photometer. The Euclid wide survey will cover 15,000 deg2 of the extragalactic sky and is complemented by two 20 deg2 deep fields. For WL, Euclid measures the shapes of 30-40 resolved galaxies per arcmin2 in one broad visible R+I+Z band (550-920 nm). The photometric redshifts for these galaxies reach a precision of dz/(1+z) \lt 0.05. They are derived from three additional Euclid NIR bands (Y, J, H in the range 0.92-2.0 micron), complemented by ground based photometry in visible bands derived from public data or through engaged collaborations. The BAO are determined from a spectroscopic survey with a redshift accuracy dz/(1+z) =0.001. The slitless spectrometer, with spectral resolution ~250, predominantly detects Ha emission line galaxies. Euclid is a Medium Class mission of the ESA Cosmic Vision 2015-2025 programme, with a foreseen launch date in 2019. This report (also known as the Euclid Red Book) describes the outcome of the Phase A study.

1,213 citations

René J. Laureijs, Jérôme Amiaux, S. Arduini1, J.-L. Auguères  +217 moreInstitutions (14)
14 Oct 2011
TL;DR: Euclid as discussed by the authors is a space-based survey mission from the European Space Agency designed to understand the origin of the universe's accelerating expansion, using cosmological probes to investigate the nature of dark energy, dark matter and gravity by tracking their observational signatures.
Abstract: Euclid is a space-based survey mission from the European Space Agency designed to understand the origin of the Universe's accelerating expansion. It will use cosmological probes to investigate the nature of dark energy, dark matter and gravity by tracking their observational signatures on the geometry of the universe and on the cosmic history of structure formation. The mission is optimised for two independent primary cosmological probes: Weak gravitational Lensing (WL) and Baryonic Acoustic Oscillations (BAO). The Euclid payload consists of a 1.2 m Korsch telescope designed to provide a large field of view. It carries two instruments with a common field-of-view of ~0.54 deg2: the visual imager (VIS) and the near infrared instrument (NISP) which contains a slitless spectrometer and a three bands photometer. The Euclid wide survey will cover 15,000 deg2 of the extragalactic sky and is complemented by two 20 deg2 deep fields. For WL, Euclid measures the shapes of 30-40 resolved galaxies per arcmin2 in one broad visible R+I+Z band (550-920 nm). The photometric redshifts for these galaxies reach a precision of dz/(1+z) < 0.05. They are derived from three additional Euclid NIR bands (Y, J, H in the range 0.92-2.0 micron), complemented by ground based photometry in visible bands derived from public data or through engaged collaborations. The BAO are determined from a spectroscopic survey with a redshift accuracy dz/(1+z) =0.001. The slitless spectrometer, with spectral resolution ~250, predominantly detects Ha emission line galaxies. Euclid is a Medium Class mission of the ESA Cosmic Vision 2015-2025 programme, with a foreseen launch date in 2019. This report (also known as the Euclid Red Book) describes the outcome of the Phase A study.

1,189 citations

Posted Content
TL;DR: DESI as discussed by the authors is a ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey.
Abstract: DESI (Dark Energy Spectroscopic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey. To trace the underlying dark matter distribution, spectroscopic targets will be selected in four classes from imaging data. We will measure luminous red galaxies up to $z=1.0$. To probe the Universe out to even higher redshift, DESI will target bright [O II] emission line galaxies up to $z=1.7$. Quasars will be targeted both as direct tracers of the underlying dark matter distribution and, at higher redshifts ($ 2.1 < z < 3.5$), for the Ly-$\alpha$ forest absorption features in their spectra, which will be used to trace the distribution of neutral hydrogen. When moonlight prevents efficient observations of the faint targets of the baseline survey, DESI will conduct a magnitude-limited Bright Galaxy Survey comprising approximately 10 million galaxies with a median $z\approx 0.2$. In total, more than 30 million galaxy and quasar redshifts will be obtained to measure the BAO feature and determine the matter power spectrum, including redshift space distortions.

965 citations

Journal ArticleDOI
B. Flaugher1, H. T. Diehl1, K. Honscheid2, T. M. C. Abbott, O. Alvarez1, R. Angstadt1, J. Annis1, M. Antonik3, O. Ballester4, L. Beaufore2, Gary Bernstein5, R. A. Bernstein6, B. Bigelow7, Marco Bonati, D. Boprie7, David J. Brooks3, E. Buckley-Geer1, J. Campa, L. Cardiel-Sas4, Francisco J. Castander8, Javier Castilla, H. Cease1, J. M. Cela-Ruiz, S. Chappa1, Edward C. Chi1, C. Cooper7, L. N. da Costa, E. Dede7, G. Derylo1, Darren L. DePoy9, J. De Vicente, Peter Doel3, Alex Drlica-Wagner1, J. Eiting2, Ann Elliott2, J. Emes10, Juan Estrada1, A. Fausti Neto, D. A. Finley1, R. Flores1, Josh Frieman1, Josh Frieman11, D. W. Gerdes7, Michael D. Gladders11, B. Gregory, G. Gutierrez1, Jiangang Hao1, S.E. Holland10, Scott Holm1, D. Huffman1, Cheryl Jackson1, David J. James, M. Jonas1, Armin Karcher10, I. Karliner12, Steve Kent1, Richard Kessler11, Mark Kozlovsky1, Richard G. Kron11, Donna Kubik1, Kyler Kuehn13, S. E. Kuhlmann14, K. Kuk1, Ofer Lahav3, A. Lathrop1, J. Lee10, Michael Levi10, P. Lewis15, Tianjun Li9, I. Mandrichenko1, Jennifer L. Marshall9, G. Martinez, K. W. Merritt1, Ramon Miquel4, Ramon Miquel16, F. Munoz, Eric H. Neilsen1, Robert C. Nichol17, Brian Nord1, Ricardo L. C. Ogando, Jamieson Olsen1, N. Palaio9, K. Patton2, John Peoples1, A. A. Plazas18, A. A. Plazas19, J. Rauch1, Kevin Reil15, J.-P. Rheault9, Natalie A. Roe10, H. Rogers15, A. Roodman20, A. Roodman15, E. J. Sanchez, V. Scarpine1, Rafe Schindler15, Ricardo Schmidt, R. Schmitt1, Michael Schubnell7, Katherine Schultz1, P. Schurter, L. Scott1, S. Serrano8, Terri Shaw1, Robert Connon Smith, Marcelle Soares-Santos1, A. Stefanik1, W. Stuermer1, E. Suchyta2, A. Sypniewski7, G. Tarle7, Jon J Thaler12, R. Tighe, C. Tran10, Douglas L. Tucker1, Alistair R. Walker, G. Wang10, M. Watson1, Curtis Weaverdyck7, W. C. Wester1, Robert J. Woods1, Brian Yanny1 
TL;DR: The Dark Energy Camera as mentioned in this paper was designed and constructed by the Dark Energy Survey Collaboration, and meets or exceeds the stringent requirements designed for the wide-field and supernova surveys for which the collaboration uses it.
Abstract: The Dark Energy Camera is a new imager with a 2.2-degree diameter field of view mounted at the prime focus of the Victor M. Blanco 4-meter telescope on Cerro Tololo near La Serena, Chile. The camera was designed and constructed by the Dark Energy Survey Collaboration, and meets or exceeds the stringent requirements designed for the wide-field and supernova surveys for which the collaboration uses it. The camera consists of a five element optical corrector, seven filters, a shutter with a 60 cm aperture, and a CCD focal plane of 250 micron thick fully-depleted CCDs cooled inside a vacuum Dewar. The 570 Mpixel focal plane comprises 62 2kx4k CCDs for imaging and 12 2kx2k CCDs for guiding and focus. The CCDs have 15 microns x15 microns pixels with a plate scale of 0.263 arc sec per pixel. A hexapod system provides state-of-the-art focus and alignment capability. The camera is read out in 20 seconds with 6-9 electrons readout noise. This paper provides a technical description of the camera's engineering, construction, installation, and current status.

844 citations

Journal ArticleDOI
Bernard Aubert, A. Bazan, A. Boucham, D. Boutigny  +816 moreInstitutions (68)
TL;DR: BABAR as discussed by the authors is a detector for the SLAC PEP-II asymmetric e+e-B Factory operating at the upsilon 4S resonance, which allows comprehensive studies of CP-violation in B-meson decays.
Abstract: BABAR, the detector for the SLAC PEP-II asymmetric e+e- B Factory operating at the upsilon 4S resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagentic showers from electrons and photons are detected in an array of CsI crystals located just inside the solenoidal coil of a superconducting magnet. Muons and neutral hadrons are identified by arrays of resistive plate chambers inserted into gaps in the steel flux return of the magnet. Charged hadrons are identified by dE/dx measurements in the tracking detectors and in a ring-imaging Cherenkov detector surrounding the drift chamber. The trigger, data acquisition and data-monitoring systems, VME- and network-based, are controlled by custom-designed online software. Details of the layout and performance of the detector components and their associated electronics and software are presented.

789 citations


Cited by
More filters
Journal ArticleDOI
Claude Amsler1, Michael Doser2, Mario Antonelli, D. M. Asner3  +173 moreInstitutions (86)
TL;DR: This biennial Review summarizes much of particle physics, using data from previous editions.

12,798 citations

Journal ArticleDOI
TL;DR: The Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) at CERN as mentioned in this paper was designed to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10(34)cm(-2)s(-1)
Abstract: The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10(34)cm(-2)s(-1) (10(27)cm(-2)s(-1)). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4 pi solid angle. Forward sampling calorimeters extend the pseudo-rapidity coverage to high values (vertical bar eta vertical bar <= 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.

5,193 citations

Journal ArticleDOI
TL;DR: In this paper, a short introduction to N = 1 supersymmetry and supergravity and review the attempts to construct models in which the breakdown scale of the weak interactions is related to supersymmetric breaking is given.

3,056 citations

Journal ArticleDOI
TL;DR: A survey of methods by which supersymmetry could be observed in experiments at present and future accelerators can be found in this paper, with considerable emphasis on pedagogical completeness.

2,841 citations