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Pulsar timing array information


A pulsar timing array (PTA) is a set of galactic pulsars that is monitored and analysed to search for correlated signatures in the pulse arrival times on Earth. As such, they are galactic-sized detectors. Although there are many applications for pulsar timing arrays, the best known is the use of an array of millisecond pulsars to detect and analyse long-wavelength (i.e., low-frequency) gravitational wave background. Such a detection would entail a detailed measurement of a gravitational wave (GW) signature, like the GW-induced quadrupolar correlation[clarify] between arrival times of pulses emitted by different millisecond pulsar pairings that depends only on the pairings' angular separations in the sky. Larger arrays may be better for GW detection because the quadrupolar spatial correlations induced by GWs can be better sampled by many more pulsar pairings. With such a GW detection, millisecond pulsar timing arrays would open a new low-frequency window in gravitational-wave astronomy to peer into potential ancient astrophysical sources and early Universe processes, inaccessible by any other means.[1][2]

  1. ^ Lommen, Andrea N (13 November 2015). "Pulsar timing arrays: the promise of gravitational wave detection". Reports on Progress in Physics. 78 (12): 124901. Bibcode:2015RPPh...78l4901L. doi:10.1088/0034-4885/78/12/124901. PMID 26564968. S2CID 42813343.
  2. ^ O'Callaghan, Jonathan (4 August 2023). "A Background 'Hum' Pervades the Universe. Scientists Are Racing to Find Its Source - Astronomers are now seeking to pinpoint the origins of an exciting new form of gravitational waves that was announced earlier this year". Scientific American. Archived from the original on 4 August 2023. Retrieved 5 August 2023. Astronomers are now seeking to pinpoint the origins of an exciting new form of gravitational waves that was announced earlier this year.

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Pulsar timing array

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A pulsar timing array (PTA) is a set of galactic pulsars that is monitored and analysed to search for correlated signatures in the pulse arrival times...

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International Pulsar Timing Array

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International Pulsar Timing Array (IPTA) is a multi-institutional, multi-telescope collaboration comprising the European Pulsar Timing Array (EPTA), the...

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European Pulsar Timing Array

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European Pulsar Timing Array (EPTA) is a European collaboration to combine five 100-m class radio-telescopes to observe an array of pulsars with the specific...

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Parkes Observatory

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frequency waves are detected using pulsar timing arrays. Astronomers monitor the timing of approximately 100 pulsars spread widely across our galaxy over...

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North American Nanohertz Observatory for Gravitational Waves

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Australia, the European Pulsar Timing Array, and the Indian Pulsar Timing Array as part of the International Pulsar Timing Array. Gravitational waves are...

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Millisecond pulsar

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and the discoveries of many new millisecond pulsars advanced the sensitivity of the pulsar timing array to gravitational waves in the early stages of...

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Gravitational wave background

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Universe, which is detectable by gravitational-wave experiments, like pulsar timing arrays. The signal may be intrinsically random, like from stochastic processes...

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Neutron star

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object depending on interpretation. For pulsars, such pulsar planets can be detected with the pulsar timing method, which allows for high precision and...

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Steven Detweiler

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of physics at the University of Florida best known for proposing pulsar timing arrays as a means to detect gravitational waves, an idea that led to the...

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The Karl G. Jansky Very Large Array (VLA) is a centimeter-wavelength radio astronomy observatory in the southwestern United States. It lies in central...

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Kramer, M.; Lam, M. T.; et al. (2020). "A pulsar-based time-scale from the International Pulsar Timing Array". Monthly Notices of the Royal Astronomical...

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Speed of light

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less than one nanosecond, the speed of light can be directly measured by timing the delay of a light pulse from a laser or an LED reflected from a mirror...

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LIGO

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Their existence was indirectly confirmed when observations of the binary pulsar PSR 1913+16 in 1974 showed an orbital decay which matched Einstein's predictions...

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which are relatively far away from the pulsar. There are two main drawbacks to the pulsar timing method: pulsars are relatively rare, and special circumstances...

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Pink noise

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frequencies affects pulsar timing arrays, the European Pulsar Timing Array (EPTA) and the future International Pulsar Timing Array (IPTA); at low frequencies...

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Supernova

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at first, a puzzle. Some considered rotational energy from the central pulsar as a source. Although the energy that initially powers each type of supernovae...

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Laser Interferometer Space Antenna

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April 2014. Stairs, Ingrid H. (2003). "Testing General Relativity with Pulsar Timing". Living Reviews in Relativity. 6 (1): 5. arXiv:astro-ph/0307536. Bibcode:2003LRR...

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General relativity

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Burke-Spolaor, S.; et al. (2010), "The international pulsar timing array project: using pulsars as a gravitational wave detector", Classical and Quantum...

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Tests of general relativity

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Search for extraterrestrial intelligence

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an Earth-based radio telescope array with 1,500 dishes known as "Project Cyclops". The price tag for the Cyclops array was US$10 billion. Cyclops was...

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Allen Telescope Array

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the gravitational wave background from massive black holes through pulsar timing. Measure molecular cloud and star formation properties using new molecular...

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Radio astronomy

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well as entirely new classes of objects, such as radio galaxies, quasars, pulsars, and masers. The discovery of the cosmic microwave background radiation...

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Redshift

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detection Laser interferometers Resonant mass detectors Proposed: Atom interferometers Indirect detection B-modes of CMB Pulsar timing array Binary pulsar...

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First observation of gravitational waves

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waves had been inferred only indirectly, via their effect on the timing of pulsars in binary star systems. The waveform, detected by both LIGO observatories...

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