Gravitational Waves
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Real-time search results for Gravitational Wavesen-usMon, 06 Jul 2015 16:01:01 GMTReal-Time Search Powered by FeedRank®http://www.rssmicro.com/images/rssmicro_logo3.gif
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1440Banks of templates for all-sky narrow-band searches of gravitational waves from spinning neutron stars
http://iopscience.iop.org/0264-9381/32/14/145014
<p><font color="Gray">Source: iopscience.iop.org --- Thursday, July 02, 2015</font><br />We construct efficient banks of templates suitable for all-sky narrow-band searches of almost monochromatic <b>Gravitational</b> <b>Waves</b> originating from spinning neutron stars in our Galaxy in data collected by interferometric detectors. We consider <b>Waves</b> with one spindown parameter included, and we assume that both the position of the <b>Gravitational</b>-wave source in the sky and the wave's frequency, together with spindown parameter, are unknown. In the construction we employ a simplified model of the signal with constant amplitude and phase which is a linear function of unknown parameters. Our template banks enable the usage of the fast Fourier transform algorithm in the computation of the maximum-likelihood ##IMG## [http://ej.iop.org/images/0264-9381/32/14/145014/cqg515469ieqn1.gif] {${\mathcal{F}}$} -statistic for nodes of the grids defining the bank, and fulfill an additional constraint needed to resample the data to barycentric time efficiently. All these template ... ...</p>http://iopscience.iop.org/0264-9381/32/14/145014Thu, 02 Jul 2015 12:00:00 GMTDetecting Quantum Gravitational Effects of Loop Quantum Cosmology in the Early Universe?
http://iopscience.iop.org/2041-8205/807/1/L17
<p><font color="Gray">Source: iopscience.iop.org --- Wednesday, July 01, 2015</font><br />We derive the primordial power spectra and spectral indexes of the density fluctuations and <b>Gravitational</b> <b>Waves</b> in the framework of loop quantum cosmology (LQC) with holonomy and inverse-volume corrections by using the uniform asymptotic approximation method to its third order, at which the upper error bounds are ##IMG## [http://ej.iop.org/images/2041-8205/807/1/L17/apjl516075ieqn1.gif] {$\lesssim 0.15\%$} and accurate enough for the current and forthcoming cosmological observations. Then, using the Planck, BAO, and supernova data, we obtain the tightest constraints on quantum <b>Gravitational</b> effects from LQC corrections and find that such effects could be well within the detection of the current and forthcoming cosmological observations. ...</p>http://iopscience.iop.org/2041-8205/807/1/L17Thu, 02 Jul 2015 03:44:00 GMT[arXiv:1507.00251] From Microscopic Gravitational Waves to the Quantum Indeterminism
http://front.math.ucdavis.edu/1507.00251
<p><font color="Gray">Source: front.math.ucdavis.edu --- Monday, June 29, 2015</font><br />Based on an extended space-time symmetry a new attempt to search for links between general relativity and quantum mechanics is proposed. A simplified cylindrical model of <b>Gravitational</b> geometrical dynamics leads to a microscopic geodesic description of strongly curved extradimensional space-time which implies a duality between an emission law of microscopic <b>Gravitational</b> <b>Waves</b> and the quantum mechanical equations of free elementary particles. Consequently, the Heisenberg indeterminism would originate from the time-space curvatures. ...</p>http://front.math.ucdavis.edu/1507.00251Tue, 30 Jun 2015 03:40:00 GMTGravitational Waves in a Shallow Compressible Liquid
http://authors.library.caltech.edu/id/eprint/58640
<p><font color="Gray">Source: authors.library.caltech.edu --- Saturday, June 27, 2015</font><br />This paper develops the theory of the propagation of <b>Waves</b> through a horizontally stratified compressible liquid under the influence of gravity, with two simplifying assumptions: (1) The wave amplitudes are small, so that a linear or first-order theory suffices; (2) the liquid is assumed to be shallow so that the lengths of all <b>Waves</b> are large in comparison with the liquid depth. ...</p>http://authors.library.caltech.edu/id/eprint/58640Sat, 27 Jun 2015 17:48:00 GMTImproved sensors help navigate gravity waves
http://www.deepstuff.org/improved-sensors-help-navigate-gravity-waves/
<p><font color="Gray">Source: www.deepstuff.org --- Friday, June 26, 2015</font><br /><img src="http://i1.wp.com/www.deepstuff.org/wp-content/uploads/2015/06/100c9dca03642d3643dbd8ed1039a858_L.jpg?resize=150%2C150" & width="150" & height="150" style="margin: 5pt 10px 0px 0px; float: left;" border="1" align="left" alt="" />Efforts to detect <b>Gravitational</b> <b>Waves</b>—which were first predicted by Albert Einstein nearly 100 years ago—are advancing with international researchers including UWA researchers boosting the sensitivity of wave detectors. <b>Gravitational</b> <b>Waves</b> are ripples in the fabric of space and time created by… The post Improved sensors help navigate gravity <b>Waves</b> appeared first on DeepStuff.org . ...</p>http://www.deepstuff.org/improved-sensors-help-navigate-gravity-waves/Fri, 26 Jun 2015 13:42:00 GMTOptical frequency standards for gravitational wave detection using satellite Doppler velocimetry
http://iopscience.iop.org/1367-2630/17/6/063030
<p><font color="Gray">Source: iopscience.iop.org --- Tuesday, June 23, 2015</font><br /><b>Gravitational</b> <b>Waves</b> (GWs) imprint apparent Doppler shifts on the frequency of photons propagating between an emitter and detector of light. This forms the basis of a method to detect GWs using Doppler velocimetry between pairs of satellites. Operating in the micro-hertz to milli-hertz <b>Gravitational</b> frequency band, this method could lead to the direct detection of GWs. The crucial component in such detectors is the frequency standard on board the emitting and receiving satellites. Recent developments in atomic frequency standards have led to devices that are approaching the sensitivity required to detect GWs from astrophysically interesting sources. The sensitivity of satellites equipped with optical frequency standards for Doppler velocimetry is examined, and a design for a robust, space-capable optical frequency standard is presented. ...</p>http://iopscience.iop.org/1367-2630/17/6/063030Tue, 23 Jun 2015 16:39:00 GMTUpgraded LIGO will begin hunt for gravitational waves soon
http://feedproxy.google.com/~r/PhysicsWorldNews/~3/jzCY4dxNHPs/upgraded-ligo-will-begin-hunt-for-gravitational-waves-soon
<p><font color="Gray">Source: physicsworld.com --- Monday, June 22, 2015</font><br />First data from Advanced Laser Interferometer <b>Gravitational</b>-wave Observatory expected in September ...</p>http://feedproxy.google.com/~r/PhysicsWorldNews/~3/jzCY4dxNHPs/upgraded-ligo-will-begin-hunt-for-gravitational-waves-soonMon, 22 Jun 2015 15:42:00 GMTUWA physicists celebrate advance in search for gravitational waves
http://www.news.uwa.edu.au/201506227722/international/uwa-physicists-celebrate-advance-search-gravitational-waves
<p><font color="Gray">Source: www.news.uwa.edu.au --- Monday, June 22, 2015</font><br />An international collaboration of scientists, including a team from The University of Western Australia, has upgraded United States <b>Gravitational</b> wave detectors to bring the instruments to sensitivities that are expected to directly detect and measure <b>Gravitational</b> <b>Waves</b> for the first time. read more ...</p>http://www.news.uwa.edu.au/201506227722/international/uwa-physicists-celebrate-advance-search-gravitational-wavesMon, 22 Jun 2015 07:00:00 GMTHow Scientists Are Looking For Ripples In Spacetime We are...
http://scientiflix.com/post/121946882111
<p><font color="Gray">Source: scientiflix.com --- Friday, June 19, 2015</font><br />How Scientists Are Looking For Ripples In Spacetime We are constantly searching for evidence of the Big Bang. One form of proof could be <b>Gravitational</b> <b>Waves</b>, but how do we go about finding them? Read More: Dialing In To Noise By: DNews . ...</p>http://scientiflix.com/post/121946882111Fri, 19 Jun 2015 21:13:00 GMTBig Picture Science – It’s All Relative: Beverly Berger / Gravitational Waves
http://radio.seti.org/blog/2015/06/big-picture-science-its-all-relative-beverly-berger-gravitational-waves/
<p><font color="Gray">Source: radio.seti.org --- Saturday, June 13, 2015</font><br />Beverly Berger / <b>Gravitational</b> <b>Waves</b> click to listen (trt 5:33) Part 4 of It’s All Relative , featuring Beverly Berger , theoretical physicist and the Secretary for the International Society on General Relativity and Gravitation, discussing the search for <b>Gravitational</b> <b>Waves</b> as predicted by Einstein’s theory of General Relativity. ...</p>http://radio.seti.org/blog/2015/06/big-picture-science-its-all-relative-beverly-berger-gravitational-waves/Sat, 13 Jun 2015 20:32:00 GMT