Publications (58)
The tip of the iceberg: the frequency content of the Delta Sct star HD 50844 from CoRoT space photometry
E. Poretti, L. Mantegazza, M. Rainer +19
It has been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impossibl…
Installation status of the electron beam profiler for the Fermilab Main Injector
R. Thurman-Keup, M. Alvarez, J. Fitzgerald +5
The planned neutrino program at Fermilab requires large proton beam intensities in excess of 2 MW. Measuring the transverse profiles of these high intensity beams is challenging an…
Asterosesimology of the Delta Scuti Star V650 Tauri
L. Fox-Machado, R. Michel, M. Alvarez +2
The preliminary results of a multisite photometric campaign on the Pleiades Delta Scuti variable V650 Tauri are reported. The star was observed photometrically for 14 days during 2…
The Early Data Release of the Dark Energy Spectroscopic Instrument
DESI Collaboration, A. G. Adame, J. Aguilar +266
The Dark Energy Spectroscopic Instrument (DESI) completed its five-month Survey Validation in May 2021. Spectra of stellar and extragalactic targets from Survey Validation constitu…
Vassiliev Invariants for Links from Chern-Simons Perturbation Theory
M. Alvarez, J. M. F. Labastida, E. Perez
The general structure of the perturbative expansion of the vacuum expectation value of a product of Wilson-loop operators is analyzed in the context of Chern-Simons gauge theory. W…
Multi-site photometric campaign on the high amplitude δ Scuti star KIC 6382916
C. Ulusoy, B. UlaÅ, T. Gülmez +15
We present results of a multi-site photometric campaign on the high-amplitude \,Scuti star KIC\,6382916 in the {\it Kepler} field. The star was observed over a 85-d interval at…
A study of the photometric variability of the peculiar magnetic white dwarf WD1953-011
G. Valyavin, K. Antonyuk, S. Plachinda +14
We present and interpret simultaneous new photometric and spectroscopic observations of the peculiar magnetic white dwarf WD1953-011. The flux in the V-band filter and intensity of…
PIP-II Injector Test's Low Energy Beam Transport: Commissioning and Selected Measurements
A. Shemyakin, M. Alvarez, R. Andrews +7
The PIP2IT test accelerator is under construction at Fermilab. Its ion source and Low Energy Beam Transport (LEBT) in its initial (straight) configuration have been commissioned to…
New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
J. Chluba, M. H. Abitbol, N. Aghanim +27
Voyage 2050 White Paper highlighting the unique science opportunities using spectral distortions of the cosmic microwave background (CMB). CMB spectral distortions probe many proce…
Physical parameters determination of the RR Lyrae Star a CM, SW, SZ and UY in Bootes
J. H. Pena, A. Arellano, L. Fox Machado +3
In this preliminary work, the determination of physical parameters for the RR Lyrae stars CM, SW, SZ, and UY in Bootes from Stromgren uvby-βphotometry is presented.
Time-dependent quantum scattering in 2+1 dimensional gravity
M. Alvarez, F. M. de Carvalho Filho, L. Griguolo
The propagation of a localized wave packet in the conical space-time created by a pointlike massive source in 2+1 dimensional gravity is analyzed. The scattering amplitude is deter…
CCD Photometry of Delta Scuti stars 7 Aql and 8 Aql
L. Fox Machado, R. Michel, M. Alvarez +3
As a continuation of the study of the Delta Scuti stars 7 Aql and 8 Aql; new CCD photometric data were acquired in 2007. We present a period analysis on these data that confirm the…
Analysis of Observables in Chern-Simons Perturbation Theory
M. Alvarez, J. M. F. Labastida
Chern-Simons Theory with gauge group is analyzed from a perturbation theory point of view. The vacuum expectation value of the unknot is computed up to order and it i…
DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
DESI Collaboration, A. G. Adame, J. Aguilar +196
We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman- (Ly) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectro…
Status of the warm front end of PXIE
A. Shemyakin, M. Alvarez, R. Andrews +10
A CW-compatible, pulsed H- superconducting linac is envisaged as a possible path for upgrading Fermilab's injection complex. To validate the concept of the front- end of such a mac…
Stromgren Photometry of the Delta Scuti Stars 7 Aql and 8 Aql
L. Fox Machado, M. Alvarez, L. Parrao +1
The preliminary results of new photometric observations of the Scuti stars 7 Aql and 8 Aql are reported. 51 hr of photoelectric photometric data were obtained over t…
New multisite observations of Delta Scuti stars V624 Tauri and HD 23194
L. Fox Machado, E. Michel, M. Chevreton +10
The preliminary results of STEPHI 2006 campaign are reported.
DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
DESI Collaboration, A. G. Adame, J. Aguilar +200
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman- forest tracers from the first year of observations from…
Primitive Vassiliev Invariants and Factorization in Chern-Simons Perturbation Theory
M. Alvarez, J. M. F. Labastida
The general structure of the perturbative expansion of the vacuum expectation value of a Wilson line operator in Chern-Simons gauge field theory is analyzed. The expansion is organ…
Topological Matter in Four Dimensions
M. Alvarez, J. M. F. Labastida
Topological models involving matter couplings to Donaldson-Witten theory are presented. The construction is carried using both, the topological algebra and its central extension, w…
PICO: Probe of Inflation and Cosmic Origins
S. Hanany, M. Alvarez, E. Artis +79
The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting of an imaging polarimeter operating in frequency bands between 20 and 800 GHz. W…
Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument
DESI Collaboration, A. G. Adame, J. Aguilar +261
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg over five years to constrain the cosmic expansion history through precise m…
Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismology
J. -N. Fu, G. Vauclair, J. Su +15
An increasing number of white dwarf stars show atmospheric chemical composition polluted by heavy elements accreted from debris disk material. The existence of such debris disks st…
Multi-site observations of Delta Scuti stars 7 Aql and 8 Aql (a new Delta Scuti variable): The twelfth STEPHI campaign in 2003
L. Fox Machado, E. Michel, F. Perez Hernandez +12
We present an analysis of the pulsation behaviour of the Delta Scuti stars 7 Aql (HD 174532) and 8 Aql (HD 174589) -- a new variable star -- observed in the framework of STEPHI XII…
Pulsational frequencies of the eclipsing delta-Scuti star HD 172189
J. E. S. Costa, E. Michel, J. Pena +12
The eclipsing delta-Scuti star HD 172189 is a probable member of the open cluster IC 4756 and a promising candidate target for the CoRoT mission. The detection of pulsation modes i…
GAW - An Imaging Atmospheric Cherenkov Telescope with Large Field of View
G. Cusumano, G. Agnetta, A. Alberdi +47
GAW, acronym for Gamma Air Watch, is a Research and Development experiment in the TeV range, whose main goal is to explore the feasibility of large field of view Imaging Atmospheri…
DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
DESI Collaboration, A. G. Adame, J. Aguilar +210
We present cosmological results from the measurement of clustering of galaxy, quasar and Lyman- forest tracers from the first year of observations with the Dark Energy Spectros…
uvby-beta photoelectric photometry of Cepheid stars
J. H. Peña, A. Arellano Ferro, R. Peña-Miller +9
We present time-series uvby-beta photometry of 41 classical Cepheid stars. A brief discussion of the comparison between the presented data and previous photometric data has been do…
Third generation residual gas ionization profile monitors at Fermilab
J. R. Zagel, M. Alvarez, B. Fellenz +6
The latest generation of IPMs installed in the Fermilab Main Injector and Recycler incorporate a 1 kG permanent magnet, a newly designed high-gain, rad-tolerant preamp, and a contr…
CCD Photometry of the Pleiades Delta Scuti Star V650 Tauri
L. Fox Machado, R. Michel, M. Alvarez +2
The preliminary results of a three-site CCD photometric campaign are reported. The Scuti variable V650 Tauri belonging to the Pleiades cluster was observed photometrically for…
Strömgren photometry and spectroscopy of the Delta Scuti stars 7 Aql and 8 Aql
L. Fox-Machado, M. Alvarez, R. Michel +4
Photometric ) and spectroscopic observations of the Scuti variables \astrobj{7 Aql} and \astrobj{8 Aql} are described. The Strömgren standard indices and physical p…
HD 50844: the new look of Delta Sct stars from CoRoT space photometry
E. Poretti, E. Michel, R. Garrido +21
It has also been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impo…
DESI 2024 II: Sample Definitions, Characteristics, and Two-point Clustering Statistics
DESI Collaboration, A. G. Adame, J. Aguilar +200
We present the samples of galaxies and quasars used for DESI 2024 cosmological analyses, drawn from the DESI Data Release 1 (DR1). We describe the construction of large-scale struc…
Searching for short-period variable stars in the direction of Coma Berenices and Upgren 1 open clusters: Melotte 111 AV 1224 a new eclipsing binary star
L. Fox Machado, R. Michel, M. Alvarez +1
We report the results of CCD photometric observations in the direction of the Coma Berenices and Upgren 1 open clusters with the aim at searching for new short-period variable star…
Multi-site, multi-technique survey of Gamma Doradus candidates
P. Mathias, J. -M. Le Contel, E. Chapellier +14
We present the first results of a 2-year high-resolution spectroscopy campaign of 59 candidate Gamma Doradus stars which were mainly discovered from the HIPPARCOS astrometric missi…
The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign. II. Evidence of a binary - possibly triple - system
S. Fauvaud, J. -P. Sareyan, I. Ribas +45
Short-period high-amplitude pulsating stars of Population I ( Sct stars) and II (SX Phe variables) exist in the lower part of the classical (Cepheid) instability strip. Most of…
Breaking of Topological Symmetry
M. Alvarez, J. M. F. Labastida
The coupling of topological matter to topological Yang-Mills theory in four dimensions is considered and a model is presented. It is shown that, contrary to the two-dimensional cas…
Commissioning and first results of the Electron Beam Profiler in the Main Injector at Fermilab
R. Thurman-Keup, M. Alvarez, J. Fitzgerald +4
The planned neutrino program at Fermilab requires large proton beam intensities in excess of 2 MW. Measuring the transverse profiles of these high intensity beams is challenging an…
Status of the warm front end of PIP-II injector test
A. Shemyakin, M. Alvarez, R. Andrews +15
The Proton Improvement Plan II (PIP-II) at Fermilab is a program of upgrades to the injection complex. At its core is the design and construction of a CW compatible, pulsed H- SRF…
Science with the new generation high energy gamma- ray experiments
M. Alvarez, D. D'Armiento, G. Agnetta +197
This Conference is the fifth of a series of Workshops on High Energy Gamma- ray Experiments, following the Conferences held in Perugia 2003, Bari 2004, Cividale del Friuli 2005, El…
The Delta Scuti star FG Vir. V. The 2002 photometric multisite campaign
M. Breger, F. Rodler, M. L. Pretorius +15
A high-accuracy multisite campaign was carried out from 2002 January to May with a photometric coverage of 398 hours at five observatories. The concentration on a few selected site…
DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
DESI Collaboration, A. G. Adame, J. Aguilar +193
We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1<z<2.1. Divided…
Installation Progress At The PIP-II Injector Test At Fermilab
C. Baffes, M. Alvarez, R. Andrews +14
A CW-compatible, pulsed H- superconducting linac "PIP-II" is being planned to upgrade Fermilab's injection complex. To validate the front-end concept, a test accelerator (The PIP-I…
Physical parameters of seven field RR Lyrae Stars in Bootes
J. H. Peña, A. Arellano Ferro, R. Peña Miller +2
Strömgren uvby-beta photometry is reported for the RR Lyrae stars AE, RS, ST, TV, TW, UU, and XX in Bootes. The physical parameters M/Mo, log (L/Lo), M_V, log T_eff and [Fe/H], ha…
Characterizing the variability of Melotte 111 AV 1224: a new variable star in the Coma Berenices open cluster
L. Fox-Machado, R. Michel, M. Alvarez +1
A search for new pulsating stars in the Coma Berenices open cluster was carried out. As a result of this search the cluster member Melotte 111 AV 1224 presented clear indications o…
Spectroscopy of BL Cam - Observations
M. Alvarez, R. Michel, L. Fox-Machado +3
The star BL Camelopardalis (GD 428, GSC 04067-00471, V=12.92, B=13.1), is a SX Phoenicis pulsating variable showing a high amplitude variability (300-350 mmag), with a very clear p…
PlomBOX -- development of a low-cost CMOS device for environmental monitoring
A. Aguilar-Arevalo, E. Alba Posse, M. Alvarez +36
This paper reports on the development of a novel CMOS device employing lead-sensing bacteria to assay lead in drinking water. The objective of the PlomBOX project is to develop a l…
On the variability of HD 170699 - a possible COROT target
M. Alvarez, J. P. Sareyan, L. Parrao +9
We present the analysis of the variability of HD 170699, a COROT star showing the characteristics of a non evolutionary Delta Scuti star with high rotational velocity. There is a c…
Accelerator Vacuum Windows: A Review of Past Research and a Strategy for the Development of a New Design for Improved Safety and Longevity for Particle Accelerators
C. R. Ader, M. Alvarez, J. S. Batko +3
Vacuum window research continues at Fermilab and this paper will examine cost effective, consistent designs which can have a huge impact on accelerator laboratories in terms of saf…
Pulsation spectrum of Delta Sct stars: the binary HD 50870 as seen with CoRoT and HARPS
L. Mantegazza, E. Poretti, E. Michel +14
We present the results obtained with the CoRoT satellite for HD 50870, a Delta Sct star which was observed for 114.4 d. The 307,570 CoRoT datapoints were analysed with different te…
Preliminary results from the STEPHI2009 campaign on the open cluster NGC 1817
O. L. Creevey, J. N. Fu, L. Fox Machado +10
We present preliminary observational results of the multi-site STEPHI campaign on the cluster NGC 1817. The three observatories involved are San Pedro Martir (Mexico), Xing Long (C…
Pxie low energy beam transport commissioning
L. Prost, M. Alvarez, R. Andrews +6
The Proton Improvement Plan II (PIP-II) at Fermilab is a program of upgrades to the injection complex. At its core is the design and construction of a CW-compatible, pulsed H- supe…
Calculation of the Aharonov-Bohm wave function
M. Alvarez
A calculation of the Aharonov-Bohm wave function is presented. The result is a series of confluent hypergeometric functions which is finite at the forward direction.
Asteroseismology of the ZZ Ceti star HS 0507+0434B
J. -N. Fu, N. Dolez, G. Vauclair +14
The pulsating DA white dwarfs (ZZ Ceti stars) are -mode non-radial pulsators. Asteroseismology provides strong constraints on their global parameters and internal structure. Sin…
Numerical knot invariants of finite type from Chern-Simons perturbation theory
M. Alvarez, J. M. F. Labastida
Chern-Simons gauge theory for compact semisimple groups is analyzed from a perturbation theory point of view. The general form of the perturbative series expansion of a Wilson line…
On the nature of Delta Scuti star HD 115520
J. H. Pena, L. Fox Machado, B. Cervantes-Sodi +7
Observing Delta Scuti stars is most important as their multi-frequency spectrum of radial pulsations provide strong constraints on the physics of the stars interior; so any new det…
DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
A. G. Adame, J. Aguilar, S. Ahlen +195
We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range divi…
Vassiliev Invariants for Torus Knots
M. Alvarez, J. M. F. Labastida
Vassiliev invariants up to order six for arbitrary torus knots , with and coprime integers, are computed. These invariants are polynomials in and whose…