The study of astrophysical phenomena using different types of signals, such as gravitational waves, electromagnetic radiation, and neutrinos.
General relativity: The theory of gravity that predicts the existence of gravitational waves.
Electromagnetic radiation: The spectrum of light that we can observe, from radio waves to gamma rays.
Neutrino astrophysics: The study of neutrinos, subatomic particles that can provide information about astrophysical events.
Cosmic rays: High-energy particles that can be detected on Earth and may originate from astrophysical sources.
Particle physics: The study of the fundamental particles and forces of nature, including those involved in high-energy astrophysical events.
Astrophysical sources of gravitational waves: Including mergers of black holes, neutron stars, and other compact objects.
Compact binary systems: Systems of two closely orbiting compact objects such as black holes or neutron stars that are expected to be strong sources of gravitational waves.
Detector technology: Including ground-based detectors such as LIGO and VIRGO, as well as future space-based detectors such as LISA.
Data analysis techniques: Methods for processing and analyzing the data collected by gravitational wave detectors to extract information about astrophysical events.
Multi-messenger astronomy: The use of multiple types of observatories (such as gravitational wave detectors, telescopes, and neutrino detectors) to study astrophysical events from multiple angles.
Gravitational Wave Astronomy: Detects gravitational waves emitted by massive objects in space and allows astronomers to monitor the universe in a new way.
Neutrino Astronomy: Detects neutrinos, which are tiny, nearly massless particles that pass straight through almost everything.
Gamma-Ray Astronomy: Detects gamma rays, which are very high-energy electromagnetic radiation emitted from extreme astrophysical sources.
Optical Astronomy: Observes light in the visible and infrared parts of the electromagnetic spectrum, providing information about the formation, evolution, and death of stars.
Radio Astronomy: Observes radio emissions from celestial objects, providing information about the cosmic microwave background and distant galaxies.
X-ray Astronomy: Observes X-rays emitted by hot gas in the universe, providing information about black holes, neutron stars, and other high-energy phenomena.
Cosmic-Ray Astronomy: Studies the high-energy particles that bombard the Earth from outer space and helps astronomers understand the sources of these particles.
Gravitational lensing: Measures how the path of light is bent by gravity, allowing astronomers to study the distribution of dark matter in the universe.
Cosmic microwave background astronomy: Detects the faint radiation leftover from the Big Bang, providing a picture of the early universe.
Cosmic ray tomography: Uses cosmic rays to image the interior of volcanoes, archaeological structures, and other hidden features on Earth.