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The Leonard E Parker Center for Gravitation, Cosmology and Astrophysics is supported by NASA, the National Science Foundation, UW-Milwaukee College of Letters and Science, and UW-Milwaukee Graduate School. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of these organizations.
The results on the most significant Gravitational Wave event, GW150914, during LIGO’s first observation run using relativistic models of compact binary waveforms Read more
We characterize the properties of the source of the first gravitational wave directly detected in history and estimate the values of its parameters. Read more
Observing both gravitational and electromagnetic channels simultaneously! Read more
Searching for an elusive class of objects that have masses up to 100,000 times the mass of our Sun - intermediate mass black holes. Read more
Measurements of gravitational wave parameters, using the Advanced gravitational-waves detectors, can be used to constrain the neutron-star equation of state. Read more
The Advanced LIGO gravitational wave detectors will be capable of detecting violations of cherished beliefs about the nature of gravity. Read more
Next-generation telescopes will capture gravitational waveforms with sufficient accuracy to describe the departure from point-particle dynamics during the inward spiral of two objects. Constraints will be placed on the neutron star equation of state. Read more
The discovery of a gamma-ray counterpart to the 3.2-ms pulsar J1816+4510 is reported, along with strong evidence of an optical / ultraviolet companion. Read more
Much can be learned from the coincident observation of electromagnetic radiation and gravitational waves. For the first time, LIGO and Virgo performed a low-latency search for gravitational waves and provided alerts to ten partner telescopes. Read more
New simulations of black hole - neutron star mergers with high eccentricity show a wide range of outcomes, depending on the impact parameter. The observed variations may help explain the diverse characteristics in gamma-ray bursts. Read more
Many galaxies have recently been discovered at very high redshift (z>5). The properties of galaxy Q2343-BX418 at z=2.3 may shed light on the likely physical conditions in these higher redshift objects before they can be measured directly. Read more
The gravitational self-force experienced by a particle is essential to developing accurate gravitational waveforms. The calculation of the self-force was performed in the radiation gauge, assuming a circular orbit in a Schwarzschild spacetime. Read more
Einstein@Home harnesses the computing power of hundreds of thousands of home computers. For the first time, home computers enrolled in Einstein@Home discovered a new pulsar. Read more
Ground-based observations of a newly-discovered binary white dwarf system (NLTT 11748) were used to measure the relativistic beaming effect. This is the first such observation for a binary white dwarf system. Read more
After the universe expanded during inflation, models suggest a 'preheating' process occurred. Simulations of the inflaton interacting with multiple matter fields during preheating are used to predict the resulting gravitational-wave spectrum today. Read more
The Pierre Auger Observatory provides a laboratory for studying fundamental physics at energies far beyond those available at particle colliders. Cosmic neutrino observations will probe for new physics phenomena beyond the standard model. Read more
The violent collisions and mergers of neutron stars and black holes create distinct gravitational-wave signatures. For the first time, the LIGO and Virgo collaborations joined forces to search for gravitational waves from these cosmic events. Read more
Fantastic explosions known as gamma-ray bursts have been captured by several satellites. Some of these events may produce gravitational waves. LIGO and Virgo search for them just seconds before the satellite observations occurred. Read more
Gravitational waves emitted shortly after the Big Bang carry unaltered information about the physical processes that generated them. A major milestone was achieved when LIGO's search resulted in new constraints on early universe models. Read more
Origin of the highest-energy cosmic rays discovered? Read more