PPT-Gravitational Lensing

Boot Camp Robert Nemiroff Michigan Tech Abstract What is gravitational lensing what has it told us about the universe and what more can it tell us about the universe Lenses such as black holes stars galaxies clusters of galaxies and the universe as a whole will be covered Concepts such as Einstein rings photon spheres image pair creation events and shear will be defined and briefly discussed The intersection of gravitational lensing with current research frontiers will be reviewed including how microlensing is being used to search for extrasolar planets how radio telescopes are being used to probe galaxycenter black holes and how weak lensing is being used to probe galaxy evolution in the early universe Possible lensing signals in continuing and upcoming missions such as Planck DES LSST Euclid and WFIRST will be reviewed Relevant parts of the lecturers own research will also be briefly mentioned . Millisecond . Pulsars:. Dan Stinebring. Oberlin College. CWRU – May 21, 2009. . George Greenstein. (Amherst College). Discovery of “Millisecond” Pulsars. 1982 – Arecibo Observatory – Don Backer, Sri Kulkarni, .... weak . lensing. science. Rachel . Mandelbaum. , CMU. Cosmology. A homogeneous . and isotropic. universe. Spatially flat . and . expanding (accelerating!). General Relativity:. 2. Function of the metric (defining space-time behavior). some history. (based on D. . Kennefick’s. work). Historical tidbits. 1776: Laplace suggests four mechanisms that could explain secular perturbations of Moon-Earth orbit. One the explanations was a non-instantaneous propagation of gravity, affecting the binary system (abandoned because its speed would be too large to be measurable to explain the effect). . (& Gravitons ?). -. Vishal. . Kasliwal. Classical Electromagnetism. Vacuum. Maxwell Field Equations. Light!!. Electromagnetic waves. Quantum Electromagnetism. Hamiltonian of Quantized. Field. where. Sarah Bridle. University College London. 3d vs 2d (tomography). Non-Gaussian -> higher order statistics. Low redshift -> dark energy. versus. Weak Lensing Tomography. In principle (perfect zs). Presentation for . 11. th. . Amaldi. Conference on Gravitational Waves. By. ASHOK TIWARI . June 25, 2015. Tribhuvan. University, Kathmandu, Nepal. 1. Outline. . Statement of the Problem. Introduction. Redshift. in Clusters of Galaxies. Marton Trencseni. Eotvos. University, Budapest. Gravitational . Redshift. Photon escapes from gravitational well. G. ains potential energy. Speed cannot decrease =). D.S. . Hajdukovic. GBAR Collaboration Meeting. 18. th. April 2012. Our best physics . The Standard Model of Particles and Fields. +. . General Relativity . is . considered. as insufficient to explain the observed phenomena in Astrophysics and Cosmology.. Antony Lewis. http://cosmologist.info/. Lewis . arXiv:1204.5018. see also . Creminelli. . et al . astro-ph. /0405428, . arXiv:1109.1822, . Bartolo. et al arXiv:1109.2043. Lewis . arXiv:1107.5431. Lewis. ICRR, U Tokyo. Weak lensing of CMB. from. . cosmic (super-)strings. 9/28/2011 JGRG21 @ Tohoku U. w. ith A. . Taruya. (U Tokyo, RESCEU), T. . Namikawa. (U Tokyo), . K. Takahashi (Kumamoto U), Y. . To help explain how two bodies that are not in contact can exert a force on one another (i.e. gravitational, magnetic or electrostatic) we use the concept of fields. .. Fields are spheres of influence. They are invisible and intangible; they simply demonstrate how strong a characteristic is at a certain distance.. Gravitational Waves. Prediction. General Relativity – 1915. Gravity is not the pulling force envisioned by Kepler or Newton. Space warps around massive objects. Accelerating massive objects could radiate distortions like the wake of a boat. in Globular Clusters. Margarita . Safonova. . Ancient Greeks knew that light travels in a straight line... Or you wouldn’t be able to cross the road!. Gravitational . Lensing. —. Astronomical Mirages. Towards the first detection using SPT polarisation. ASA 2016 meeting, . Sydney. 04. 07. 2016. Srinivasan. . Raghunathan. School of Physics. University of Melbourne. In a nutshell . …. . South Pole Telescope – Observes CMB (both T, and P)..