118 research outputs found
The Advanced LIGO photon calibrators
The two interferometers of the Laser Interferometry Gravitational-wave Observatory (LIGO) recently detected gravitational waves from the mergers of binary black hole systems. Accurate calibration of the output of these detectors was crucial for the observation of these events and the extraction of parameters of the sources. The principal tools used to calibrate the responses of the second-generation (Advanced) LIGO detectors to gravitational waves are systems based on radiation pressure and referred to as photon calibrators. These systems, which were completely redesigned for Advanced LIGO, include several significant upgrades that enable them to meet the calibration requirements of second-generation gravitational wave detectors in the new era of gravitational-wave astronomy. We report on the design, implementation, and operation of these Advanced LIGO photon calibrators that are currently providing fiducial displacements on the order of 10−18m/Hz⎯⎯⎯⎯⎯√ with accuracy and precision of better than 1%
Search for gravitational wave ringdowns from perturbed intermediate mass black holes in LIGO-Virgo data from 2005–2010
We report results from a search for gravitational waves produced by perturbed intermediate mass black holes (IMBH) in data collected by LIGO and Virgo between 2005 and 2010. The search was sensitive to astrophysical sources that produced damped sinusoid gravitational wave signals, also known as ringdowns, with frequency 50 ≤ f0=Hz ≤ 2000 and decay timescale 0.0001 ≲ τ=s ≲ 0.1 characteristic of those produced in mergers of IMBH pairs. No significant gravitational wave candidate was detected. We report upper limits on the astrophysical coalescence rates of IMBHs with total binary mass 50 ≤ M=M⊙ ≤ 450 and component mass ratios of either 1:1 or 4:1. For systems with total mass 100 ≤ M=M⊙ ≤ 150, we report a 90% confidence upper limit on the rate of binary IMBH mergers with nonspinning and equal mass components of 6.9 × 10−8 Mpc−3 yr−1. We also report a rate upper limit for ringdown waveforms from perturbed IMBHs, radiating 1% of their mass as gravitational waves in the fundamental, l ¼ m ¼ 2, oscillation mode, that is nearly three orders of magnitude more stringent than previous results
Constraints on Cosmic Strings from the LIGO-Virgo Gravitational-Wave Detectors
Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising observational signature. In this Letter we present a search for GWs from cosmic string cusps in data collected by the LIGO and Virgo gravitational wave detectors between 2005 and 2010, with over 625 days of live time. We find no evidence of GW signals from cosmic strings. From this result, we derive new constraints on cosmic string parameters, which complement and improve existing limits from previous searches for a stochastic background of GWs from cosmic microwave background measurements and pulsar timing data. In particular, if the size of loops is given by the gravitational backreaction scale, we place upper limits on the string tension Gμ below 10−8 in some regions of the cosmic string parameter space
Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO 600, LIGO, and Virgo detectors
In this paper we report on a search for short-duration gravitational wave bursts in the frequency range 64 Hz–1792 Hz associated with gamma-ray bursts (GRBs), using data from GEO 600 and one of the LIGO or Virgo detectors. We introduce the method of a linear search grid to analyze GRB events with large sky localization uncertainties, for example the localizations provided by the Fermi Gamma-ray Burst Monitor (GBM). Coherent searches for gravitational waves (GWs) can be computationally intensive when the GRB sky position is not well localized, due to the corrections required for the difference in arrival time between detectors. Using a linear search grid we are able to reduce the computational cost of the analysis by a factor of Oð10Þ for GBM events. Furthermore, we demonstrate that our analysis pipeline can improve upon the sky localization of GRBs detected by the GBM, if a high-frequency GW signal is observed in coincidence. We use the method of the linear grid in a search for GWs associated with 129 GRBs observed satellitebased gamma-ray experiments between 2006 and 2011. The GRBs in our sample had not been previously analyzed for GW counterparts. A fraction of our GRB events are analyzed using data from GEO 600 while the detector was using squeezed-light states to improve its sensitivity; this is the first search for GWs using data from a squeezed-light interferometric observatory. We find no evidence for GW signals, either with any individual GRB in this sample or with the population as a whole. For each GRB we place lower bounds on the distance to the progenitor, under an assumption of a fixed GWemission energy of 10−2M⊙c2, with a median exclusion distance of 0.8 Mpc for emission at 500 Hz and 0.3 Mpc at 1 kHz. The reduced computational cost associated with a linear search grid will enable rapid searches for GWs associated with Fermi GBM events once the advanced LIGO and Virgo detectors begin operation
Search for gravitational radiation from intermediate mass black hole binaries in data from the second LIGO-Virgo joint science run
This paper reports on an unmodeled, all-sky search for gravitational waves from merging intermediate mass black hole binaries (IMBHB). The search was performed on data from the second joint science run of the LIGO and Virgo detectors (July 2009–October 2010) and was sensitive to IMBHBs with a range up to ∼200 Mpc, averaged over the possible sky positions and inclinations of the binaries with respect to the line of sight. No significant candidate was found. Upper limits on the coalescence-rate density of nonspinning IMBHBs with total masses between 100 and 450 M⊙ and mass ratios between 0.25 and 1 were placed by combining this analysis with an analogous search performed on data from the first LIGO-Virgo joint science run (November 2005–October 2007). The most stringent limit was set for systems consisting of two 88 M⊙ black holes and is equal to 0.12 Mpc−3 Myr−1 at the 90% confidence level. This paper also presents the first estimate, for the case of an unmodeled analysis, of the impact on the search range of IMBHB spin configurations: the visible volume for IMBHBs with nonspinning components is roughly doubled for a population of IMBHBs with spins aligned with the binary’s orbital angular momentum and uniformly distributed in the dimensionless spin parameter up to 0.8, whereas an analogous population with antialigned spins decreases the visible volume by ∼20%
Application of a Hough search for continuous gravitational waves on data from the fifth LIGO science run
We report on an all-sky search for periodic gravitational waves in the frequency range 50–1000 Hz with the first derivative of frequency in the range −8.9 × 10−10 Hz s−1 to zero in two years of data collected during LIGO\u27s fifth science run. Our results employ a Hough transform technique, introducing a χ2 test and analysis of coincidences between the signal levels in years 1 and 2 of observations that offers a significant improvement in the product of strain sensitivity with compute cycles per data sample compared to previously published searches. Since our search yields no surviving candidates, we present results taking the form of frequency dependent, 95% confidence upper limits on the strain amplitude h0. The most stringent upper limit from year 1 is 1.0 × 10−24 in the 158.00–158.25 Hz band. In year 2, the most stringent upper limit is 8.9 × 10−25 in the 146.50–146.75 Hz band. This improved detection pipeline, which is computationally efficient by at least two orders of magnitude better than our flagship Einstein@Home search, will be important for \u27quick-look\u27 searches in the Advanced LIGO and Virgo detector era
6ta Feria Estudiantil de Ciencias
1. Consumo de tabaco y malignización de algunas lesiones en la cavidad bucal en estudiantes de la Facultad de Odontología de la Universidad Nacional de Córdoba / Peralta Jimena Soledad. Tutor: Bono Alejandra
2. Enfermedades periodontales en adolescentes de Jujuy, San Luis, Catamarca y Misiones / Pastrana, Mauro; Reyes, Rocío Tatiana; Rojas Periotti; Nicolas, Sotero; Maia Agostina Fridlmeier, María Celeste. Tutor: Bono Alejandra
3. Variedad de género en la carrera de Odontología en la UNC / Cabrera Aldana, Garcia Berger Ivan, Toledo Lourdes, Geronino Sabrina, Gigena Josefina, Catherine Alfaro. Tutor: Bono Alejandra.
4. Consecuencias de la pandemia en el ejercicio de la profesión odontológica en salta y Córdoba / Cruz Agustina, Falco Delfina, Gómez Soria Ana Camila, Juarez Nadia, Morales Paredes Rosario, Presti Marvanek Romina. Tutor: Bono, Alejandra
5. Miedo a los tratamientos odontológicos presentes en niños cordobeses de 5 a 10 años y su factor principal en el 2021 / Ainete Yazmin Micaela, Alvarez Melani, Mampaso Samanta Romina, Moyano Maria Fernanda, Solari Pilar, Torrez María Luz.Ttutor: Dra. Bono Alejandra
6. Posibles factores relacionados al abandono universitario en el primer año de la carrera de odontología de la UNC / Buceta Rinaudo A, Encina Piccinini Y, Sosa AC, Torres TM, Vassallo MF, Jara A. Docente coordinador a cargo: Prof. Pablo A. Fontanetti. Docente tutora: Prof. Victoria Unamuno.
7. Nivel de conocimiento sobre cáncer bucal en adultos jóvenes / Julieta Rocío Fernández Godoy, Candela Camila Polti Pardo, Nahir Luciana Ubeid, Domínguez Joaquín, Ayelén Segovia Soto, Alina Soria. Tutores: Dr. Ramiro Tomasi. y Cisneros Mónica.
8. ¿qué sabe de cáncer bucal el alumno de primer año de la Facultad de Odontología? / Toranzo A, Colombo E, González F, Varas R, Calderón V, Copello G. Tutores: Fontanetti PA, Robledo G.
9. Conocimiento y participación en la política universitaria de estudiantes de la Facultad de Odontología / Acuña Karen; Ardiles Egle; Jais Salma; Silas Melisa; Palazesi Ana. Tutor: Graciela Robledo. Docente coordinador: Pablo Fontanetti
10. Nivel de conocimiento de los jóvenes adolescentes sobre los efectos del tabaco en su salud bucal / Molina MC, Araujo GV, Nolasco UB, Corigliani D, Vargas Lloveras MJ, Barchiesi Ulloa L. Tutores: Don JA y Fontanetti PA
11. Estudio preliminar del conocimiento de ansiedad y estrés en alumnos que inician el ciclo básico de odontología de la UNC en el año 2020 / Artetas C. Asef Carvajal M. Donaire DV. Garnero JM. Peñafort V. Zornitta AC. Tutores: Fontanetti PA. Gonzales Segura IN
12. Apreciación de los estudiantes sobre el cursado de 1°, 2° y 3° año de la Facultad de Odontología de la Universidad Nacional de Córdoba / Brollo, Anabella; Castro, Emanuele Maria Paula; Jara, Karen Thaís; Ortega, Paola Alejandra; Piquet Tomas.Tutor: Don, Julieta.
13. Un análisis de las secuelas post-COVID 19 / Agustin Turletti; Lucía Arneudo Vilches; Micaela Fernandez; Nahuel Pordomingo Arias; Paula Muñoz Macagno; Paulina Fiorini; Valentina Quinteros. Tutor: Pablo Fontanetti
14. Nivel de conocimiento sobre la salud bucal y hábitos alimentarios en jóvenes adultos argentinos / Aveldaño Cala Selena, Borile Chiara Donatella, Camacho María José, Serrano Melany, Torres Dianela.
Tutores: Ramiro Tomasi, Mónica Viviana Cisneros.
15. Síndrome visual informático en estudiantes de la UNC durante la virtualidad por la pandemia COVID 19 / Guevara Nabila, Ledesma Ailin Rosario, Lobo Ariadna María y Sanabria Paula Selene. Tutores: Fontanetti Pablo y Bolesina Nicolás
16. Motivación expresadas por ingresantes en la carrera de odontología UNC, luego del cursado del CINFO, ciclo lectivo 2021 / Chiong Ramos, Valeria Nicolle, Dávila Becerra, Tomás Agustin, Leiva, Andrés Ismael, Torres, Valentina Ailén, Torti, Virginia, Zachetti, Valentina.Tutor: Pablo Gigena
17. Miedo de los pacientes a las prácticas odontológicas / Abracaite Ignacio Emanuel, Alladio Maria Victoria,Ferpozzi Maria Florencia,Giovanni Alenajdro Giglio,Oviedo Diaz Maria Candelaria. Tutor: Pablo Gigena
18. Asistencia de alumnos del CINFO-UNC a la consulta odontológica durante el año 2020 / Asmuzi Van Cauwlaert Danisa Agustina, Bucci Maria Valentina, Maidana Guillermo Hernán, Perez Maria Sol, Rodriguez Rodriguez Álvaro. Tutor: Pablo Gigena
19. Percepciones de estudiantes del CINFO-UNC en relación a los exámenes finales en el año 2021 / Arancibia Pedro Lucas, Lo Celso Luz Maria,Martinez Rocio Sol,Tresguerres Camila,Urioste Dalla Lasta Florencia,Urrets Zavalia Paloma. Tutor: Pablo Gigena
20. Conocimientos sobre el cuidado de la salud bucal previos y posteriores al cursado del CINFO, en estudiantes de la UNC / Elizondo Brisa, Ferraris Abril, Meoni Virginia, Monteleone Martín, Latino Milena. Tutor: Pablo Gigena
21. Higiene bucal expresada por estudiantes de 3er año de las facultades de odontología y psicología de la universidad nacional de Córdoba / Deanquin Ramiro, Fleitas Matias Eloy, Gimenez Geremias, López Avalle Vera, Vera Aguirre Antonella. Tutor: Pablo Gigena
22. Actividad física y rendimiento académico en ingresantes de la Facultad de Odontología, Universidad Nacional de Córdoba, año 2021 / Machaca Agostina Ailin, Ochoa Rosario Edith, Zuttion Serena. Tutor: Pablo Gigena
23. Intereses estéticos dentales en jóvenes de Córdoba capital / Lara Nevenka Jurisic, María José Soquet, Magali Gistas, Martin Rodríguez, Ramiro Rodríguez, Lucrecia Peralta. Tutor: Pablo Gigena
24. Suficiencia académica del nivel secundario para el ingreso a la Facultad de Odontología 2021 / Baudaux Laura, Britos Coronel Luca, Deheza Mariano, Gómez Rocha María Luciana, Meik Ana Sofía, Tolaba Martinez Fernando. Tutor: Pablo Gigena
25. Insomnio como consecuencia de paso por el contexto de pandemia COVID19 / Muñoz Dana Valentina, Riveros Camila Itatí, Teja Sofia. Tutores: Pablo Gigena, Andrea Fernández
26. La repercusión del aspo en la realización de actividad física en los estudiantes de odontología que transitan el primer año / Agüero Martina, Altamirano Julieta Noelia, Britez Camilo, Miranda Zaragoza Emilia, Prosetto Clara, Zaccari Valentina. Tutor: Pablo Gigena
27. Estrés y rendimiento académico en estudiantes de la Facultad de Odontología de la Universidad Nacional de Córdoba, en tiempos de pandemia. / Bonzano María Sol, Buscarolo María Paula, Martínez María José, Cintas Aban Sofia Mercedes, Pérez Ledesma Lucila Candelaria. Tutor: Pablo Gigena y Mónica Franchisena.
28. Sentimientos percibidos por odontólogos/as durante la atención odontológica en tiempos de pandemia, de Córdoba capital. / Aranguez Agostina, Cuevas Zamira, Mayo Belen, Gimenez Catalina, Grandiller Constanza, Salcedo Catalina. Tutor: Pablo Gigena.
29. Relación entre actividad física y rendimiento académico en estudiantes de 1er año 2021, Facultad de Odontología Universidad Nacional de Córdoba / Vargas Castro Agustina, Rendon María Milagros. Tutor: Gigena, Pablo.
30. Relación de los alumnos universitario con la virtualidad / Diaz F, Martin S, Fiori S, Ríos M, Fernández S. Tutor: Laura Lagnarini
31. Consumo de alcohol en jóvenes durante la pandemia de COVID-19 en argentina / Casimiro B, González C; Monnier J; Silva A. Tutor: Laura Lagnarini
32. Cómo afecta la vida universitaria en los hábitos alimenticios de los estudiantes / Cammertoni V, Cuello A, Naretto V, Olivares M, Zavala J. Tutor: Lagnarini, Laura
33. Población vegetariana en la Universidad Nacional de Córdoba / Arenas Caballero MJ; Bórquez M; Etchepare S, Fierro L, Pereyra Patterer L. Tutor: Lagnarini Laura
34. Repercusión de la ansiedad en la salud bucal de estudiantes de la Facultad de Odontología durante el cursado de la carrera / Bequis C, Fichetti M, Gutiérrez Bernal A; Sudria L. Tutor: Lagnarini Laura
35. Nuevas tecnologías aplicadas en odontología en Córdoba capital / Rojos CA, Bartolé D, Campos Aguilar J, Alaniz A, de Dios SM. Tutor: Lagnarini Laura, Tomasi Ramiro
36. El uso de ortodoncia y el estado emocional del paciente / Zurita C, Scaltritti C, Hernanz M, Escanes Coral O. Tutores: Lagnarini Laura, Cisneros Mónica
37. Uso de blanqueadores dentales en adultos / Cavallone L, Diaz V, Casimiro F, Garro Ingano S. Tutor: Lagnarini Laura
38. Analizar el cambio en las rutinas alimentarias que dejó el cierre del comedor universitario / Pianelli, Victoria, Chervin, Mia, Diez Sierra, María Pilar Pasquier, Delfina, Langellotti, Valentina,
Tutor. Lagnarini, Laura
39. Determinar el conocimiento que tiene los docentes del nivel inicial y primario respecto al trastorno del habla producido en niños / Ciucci B; Rius J, Saretti V, Segovia K, Soler Cáceres K. Tutor: Lagnarini Laura
40. Determinar el conocimiento de cáncer bucal en estudiantes de carreras de ciencias de la salud de la Universidad Nacional de Córdoba / Benavides C, Miranda N; Rojas Flores C. Tutor: Lagnarini Laura
41. Determinar el conocimiento del trastorno de bipolaridad / Arabia Arce F, De la Mata A, Gaitan R, Rengífo D.Tutor: Lagnarini Laura
42. La virtualidad y las emociones de los estudiantes de la Universidad Nacional de Córdoba / Aguiar, Sofía. Bagnato; Serena. Daveloza; Micaela. Maffrand; Tomás. Monge; Luciana. Rotela, Marcela. Tutor: Murua, María Julia.
43. El estrés en el ámbito laboral odontológico / Castro Magali, Cragnolini Isabella, Lencinas María Paulina, Monjes Ana Sol, Solera Eliana, Vallejos Crespo Julieta. Tutor: Murúa Julia.
44. Impacto de la pandemia COVID -19 en la conducta de automedicación / Bruna, Micaela, Cardozo García, Andrea, De la Torre Lonzalles, Marcos Elías, Moya, Martina María, Reyes, Joaquín Alejandro, Verde, Martina Antonella. Tutores: Rourera, Ana María, Murúa María Julia
45. Impacto de la virtualidad en los estudiantes de las distintas facultades de la Universidad Nacional de Córdoba / Arias, Victoria Fernanda; Borgart, Sofía Agostina; Chiovini, Camila Belén; Ledesma, Camila Agustina; Manera, Serena y Mendoza, Camila Valentina. Tutor: Murúa, María Julia
46. Influencia de la estética dental en la autoestima de los adolescentes de la provincia de Córdoba / Fontanini Santiago Ariel, Ochoa María Julieta, Rodríguez Tissera Carla, Romera Maza María Eugenia, Saleme Manuel, Sánchez Correa Thomas Santiago. Tutores: Gotusso, Claudio Mario y Murua, María Julia
47. La influencia de la virtualidad en el rendimiento académico y laboral de jóvenes adultos” / Bestvater Juliana, Brondino Candelaria Del Valle, Buttner, Ana Agustina Cantera, Ana Julia Rode Catalina, Rodríguez Rocío. Tutor: Murúa, Ma. Julia
48. Discriminación y falta de perspectiva de género por parte de los profesionales de la salud dental, hacia los pacientes en los centros odontológicos / Berardo Julia, Marinsalda Victoria, Mirenda Kenny Sofia, Sánchez Denise Celeste, Sotomayor Aquilino Josefina, Torino Ramirez Abigail.Tutores: María Eva Vallejo Murúa, María Julia Murúa
49. Análisis del impacto de sustitutos salivales en la sintomatología de pacientes que padecen trastornos bucales frecuentes / Llonga, Josefina, Salinas Guzmán, Martín Secco, Sofía CelesteTheiler, Victoria tutor: Criscuolo, María Inés
50. Influencia de las redes sociales en el uso de productos caseros para el cuidado de la piel y blanqueamiento dental en adolescentes / Diaz Rivera Ana Victoria, Iannizzotto María Rosario, Pellegrino María Agostina, Romero Lara Azul, Suarez Abraham María Guadalupe. Tutor: María Julia Murua.Fil: Actis, Adriana Beatriz. Universidad Nacional de Córdoba. Facultad de Odontología. Secretaría de Ciencia y Técnica; Argentina.Trabajos presentados por alumnos que cursaron la asignatura metodología de la investigación en ciencias de la saludFil: Actis, Adriana Beatriz. Universidad Nacional de Córdoba. Facultad de Odontología. Secretaría de Ciencia y Técnica; Argentina
Observing gravitational-wave transient GW150914 with minimal assumptions
The gravitational-wave signal GW150914 was first identified on September 14, 2015, by searches for short-duration gravitational-wave transients. These searches identify time-correlated transients in multiple detectors with minimal assumptions about the signal morphology, allowing them to be sensitive to gravitational waves emitted by a wide range of sources including binary black hole mergers. Over the observational period from September 12 to October 20, 2015, these transient searches were sensitive to binary black hole mergers similar to GW150914 to an average distance of ∼600 Mpc. In this paper, we describe the analyses that first detected GW150914 as well as the parameter estimation and waveform reconstruction techniques that initially identified GW150914 as the merger of two black holes. We find that the reconstructed waveform is consistent with the signal from a binary black hole merger with a chirp mass of ∼30 M⊙ and a total mass before merger of ∼70 M⊙ in the detector frame
THE RATE OF BINARY BLACK HOLE MERGERS INFERRED FROM ADVANCED LIGO OBSERVATIONS SURROUNDING GW150914
A transient gravitational-wave signal, GW150914, was identified in the
twin Advanced LIGO detectors on 2015 September 2015 at 09: 50: 45 UTC.
To assess the implications of this discovery, the detectors remained in
operation with unchanged configurations over a period of 39 days around
the time of the signal. At the detection statistic threshold
corresponding to that observed for GW150914, our search of the 16 days
of simultaneous two-detector observational data is estimated to have a
false-alarm rate (FAR) of <4.9 x 10(-6) yr(-1), yielding a p-value for
GW150914 of <2 x 10(-7). Parameter estimation follow-up on this trigger
identifies its source as a binary black hole (BBH) merger with component
masses (m(1), m(2)) = (36(-4)(+5), 29(-4)(+4))M-circle dot at redshift z
= 0.09(-0.04)(+0.03) (median and 90\% credible range). Here, we report
on the constraints these observations place on the rate of BBH
coalescences. Considering only GW150914, assuming that all BBHs in the
universe have the same masses and spins as this event, imposing a search
FAR threshold of 1 per 100 years, and assuming that the BBH merger rate
is constant in the comoving frame, we infer a 90\% credible range of
merger rates between 2-53 Gpc(-3) yr(-1)(comoving frame). Incorporating
all search triggers that pass a much lower threshold while accounting
for the uncertainty in the astrophysical origin of each trigger, we
estimate a higher rate, ranging from 13-600 Gpc(-3) yr(-1) depending on
assumptions about the BBH mass distribution. All together, our various
rate estimates fall in the conservative range 2-600 Gpc(-3) yr(-1)
Searching for stochastic gravitational waves using data from the two colocated LIGO Hanford detectors
Searches for a stochastic gravitational-wave background (SGWB) using terrestrial detectors typically involve cross-correlating data from pairs of detectors. The sensitivity of such cross-correlation analyses depends, among other things, on the separation between the two detectors: the smaller the separation, the better the sensitivity. Hence, a colocated detector pair is more sensitive to a gravitational-wave background than a noncolocated detector pair. However, colocated detectors are also expected to suffer from correlated noise from instrumental and environmental effects that could contaminate the measurement of the background. Hence, methods to identify and mitigate the effects of correlated noise are necessary to achieve the potential increase in sensitivity of colocated detectors. Here we report on the first SGWB analysis using the two LIGO Hanford detectors and address the complications arising from correlated environmental noise. We apply correlated noise identification and mitigation techniques to data taken by the two LIGO Hanford detectors, H1 and H2, during LIGO’s fifth science run. At low frequencies, 40–460 Hz, we are unable to sufficiently mitigate the correlated noise to a level where we may confidently measure or bound the stochastic gravitational-wave signal. However, at high frequencies, 460–1000 Hz, these techniques are sufficient to set a 95% confidence level upper limit on the gravitational-wave energy density of Ω(f)<7.7×10−4(f/900 Hz)3, which improves on the previous upper limit by a factor of ∼180. In doing so, we demonstrate techniques that will be useful for future searches using advanced detectors, where correlated noise (e.g., from global magnetic fields) may affect even widely separated detectors
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