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201“…Since secluded hidden sectors are of particular interest for dark matter models at the MeV scale or below, we pay special attention to the reach of pulsar timing arrays. Cosmological constraints on light degrees of freedom restrict the number of sub-MeV particles in a hidden sector, as well as the hidden sector temperature. …”
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202por Badurina, Leonardo, Buchmueller, Oliver, Ellis, John, Lewicki, Marek, McCabe, Christopher, Vaskonen, Ville“…We discuss the backgrounds from gravitational gradient noise in terrestrial detectors, and also binary pulsar and asteroid backgrounds in space-borne detectors. …”
Publicado 2021
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203por Ellis, John, Fairbairn, Malcolm, Hütsi, Gert, Raidal, Martti, Urrutia, Juan, Vaskonen, Ville, Veermäe, Hardi“…NANOGrav and other Pulsar Timing Arrays (PTAs) have discovered a common-spectrum process in the nHz range that may be due to gravitational waves (GWs): if so, they are likely to have been generated by black hole (BH) binaries with total masses > 109 M⊙. …”
Publicado 2023
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204por Kopp, Joachim“…In the second part of the talk, we illustrate how gravitational lensing and pulsar timing can constrain compact dark matter objects such as primordial black holes or axion mini-clusters. …”
Publicado 2019
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205“…The resulting spectrum is consistent with the tentative signal observed by the NANOGrav and Parkes pulsar timing collaborations for a string tension of G$_{μ}$ ∼ 10$^{-11…-7}$ and has ample discovery space for ground- and space-based detectors. …”
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206por Sesana, Alberto, Korsakova, Natalia, Sedda, Manuel Arca, Baibhav, Vishal, Barausse, Enrico, Barke, Simon, Berti, Emanuele, Bonetti, Matteo, Capelo, Pedro R., Caprini, Chiara, Garcia-Bellido, Juan, Haiman, Zoltan, Jani, Karan, Jennrich, Oliver, Johansson, Peter H., Khan, Fazeel Mahmood, Korol, Valeriya, Lamberts, Astrid, Lupi, Alessandro, Mangiagli, Alberto, Mayer, Lucio, Nardini, Germano, Pacucci, Fabio, Petiteau, Antoine, Raccanelli, Alvise, Rajendran, Surjeet, Regan, John, Shao, Lijing, Spallicci, Alessandro, Tamanini, Nicola, Volonteri, Marta, Warburton, Niels, Wong, Kaze, Zumalacarregui, Miguel“…By the 2040s, the μ-Hz frequency band, bracketed in between the Laser Interferometer Space Antenna (LISA) and pulsar timing arrays, will constitute the largest gap in the coverage of the astrophysically relevant GW spectrum. …”
Publicado 2019
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207por Giovannini, Massimo“…If there are instead multiple postinflationary stages evolving at different rates, then the spectral energy density always undershoots the signals potentially attributed to relic gravitons by the pulsar timing arrays at intermediate frequencies but ultimately develops a local maximum. …”
Publicado 2022
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208“…Fundamental astrophysical phenomena, such as charged particle acceleration and magnetic field generation, are presented along with spectacular phenomena, such as stellar winds (including ultra-relativistic pulsar wind), supernova explosions and evolution of its remnants, and solar flares.…”
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209por Perapechka, Ilya“…Power output of jet is calculated; it appears to change between those of black hole jet and pulsar one. Images of membrane surrounded by several types of accretion disks are produced; nonzero reflection coefficient of membrane leads to appearance of new features observable inside the black hole shadow.…”
Publicado 2018
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210por Will, Clifford M“…Completely revised and updated, this new edition features coverage of new alternative theories of gravity, a unified treatment of gravitational radiation, and the implications of the latest binary pulsar observations. It spans the earliest tests involving the Solar System to the latest tests using gravitational waves detected from merging black holes and neutron stars. …”
Publicado 2018
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211por Beischer, Bastian“…The fluxes of several $\gamma$-ray producing sources, including Vela, Geminga and the Crab pulsar are shown. The Geminga pulsar is studied in detail, revealing its pulsed emission of $\gamma$-rays in the AMS-02 data, which allows to measure its frequency of rotation and to estimate its magnetic field strength and age. …”
Publicado 2020
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212“…Evolving after inflation, the domain walls may leave their imprint in stochastic gravitational waves background, in the frequency range accessible for the pulsar timing array measurements. We derive the characteristic strain power spectrum produced by the distribution of the closed domain walls and relate it with the recently reported NANOGrav signal excess. …”
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213“…GH was measured with poly- and monoclonal antibodies; 24hGH-profile pattern analysed by PULSAR. The NS-children were randomly assigned to Norditropin(®) 33 or 66 μg/kg/day, and TS-girls were consecutively treated with Genotropin(®) 33 or 66 μg/kg/day. …”
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214por Giovannini, Massimo“…Throughout the conventional stages of the inflationary and post-inflationary evolution, the microwave background anisotropies measurements, the pulsar timing limits and the big-bang nucleosythesis constraints set stringent bounds on the refractive index and on its rate of variation. …”
Publicado 2015
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215por Giovannini, Massimo“…While the temperature and polarization anisotropies of the microwave background radiation probe the low-frequency tail of the graviton spectra, during the next score year the pulsar timing arrays and the wide-band interferometers (both terrestrial and hopefully space-borne) will explore a much larger frequency window encompassing the nHz domain and the audio band. …”
Publicado 2019
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216por Schwaller, Pedro“…We summarise the basic conditions for a strong first order phase transition for SU(N) dark sectors with n_f flavours, calculate the gravitational wave spectrum and show that, depending on the dark confinement scale, it can be detected at eLISA or in pulsar timing array experiments. The gravitational wave signal provides a unique test of the gravitational interactions of a dark sector, and we discuss the complementarity with conventional searches for new dark sectors. …”
Publicado 2015
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217“…The six chapters explore three physical regions of a neutron star: the space around it, where accretion and pulsar companions allow testing of general relativity its surface, where millisecond pulsation and X-ray bursts provide clues about general relativistic effects and the equation of state of neutron matter its interior, of course, inaccessible to direct observations, can nevertheless, be probed with all observational parameters related to neutron star variability.…”
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218“…We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension $G \mu \sim 10^{-12} - 10^{-11}$ and a string intercommutation probability $p \sim 10^{-3} - 10^{-1}$. …”
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219“…Gravitational Waves (GW) sourced by second-order primordial curvature fluctuations are among the favoured models fitting the recent Pulsar Timing Array (PTA) measurement of a Stochastic GW Background (SGWB). …”
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220“…This simple model, which can explain a wide range of phenomena, including neutrino oscillations, baryogenesis, the pulsar velocities, and the early reionization, allows for the dark-matter sterile neutrinos to have masses as small as 0.5 keV. …”
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