Chairperson : B.S. Sathyaprakash

Einstein Telescope is a third generation gravitational wave antenna which is hoped to be a factor 10 better in sensitivity than advanced detectors with a possible wide band sensitivity from 1 to 5 Hz all the way up to 10 kHz. This is a frequency window in which we can expect a wide variety of sources and the sensitivity will be deep enough to address a range of problems in fundamental physics, cosmology and astrophysics. The goal of ET design study is to identify potentially interesting problems and study them in greater depth in the context of instrument design. The GWIC Roadmap will serve as a reference for our study with the goal to make in-depth exploration of what science goals can be met the Einstein Telescope.

WP4 targets

The goal of WP4 is to address ET science and data analysis. The above frequency range and sensitivity pose some serious and unprecedented technological challenges. The design goal is to get the best possible sensitivity in the range [1, 104] Hz but compromises might have to be made based on the level of technical challenge, the cost to meet those challenges, site selection, etc. The ultimate design should be based on the scientific merit of the different trade-offs.

WP4 will set forth key science requirements to be met by a third generation detector the examples of which include:

  • Studying cores of compact objects and general relativistic instabilities.
  • Solving the enigma of gamma-ray bursts and resolving their different classes.
  • Understanding the mass-spectrum of compact stars and their populations (neutron stars, strange stars, etc.).
  • Meausring the cosmological parameters with GW standard sirens.

We need to be able to evaluate the science potential of ET for different geometrical and optical configurations, choice of materials and site, etc., each corresponding to a different sensitivity curve.
A detector with such a sensitivity window and span will pose new data analysis challenges. There will be many classes of sources all visible at the same time requiring a paradigm shift in the way data is currently analyzed. Moreover, some of the souces that are considered to be transient will not be so in ET requiring greater computational costs as well as the development of new search algorithms. A careful and comprehensive study of the data analysis challenges and solutions should be carried out along side the science goals. In the light of this it is evisaged that the participating groups will have two primary responsibilities:

  • Address the science that ET can do which a second generation detector can’t. Group the science into one of fundamental physics, cosmology and astrophysics and prioritize the science potentials.
  • Develop tools that can be used to evaluate the performance of different detector configurations in the context of science goals and develop a metric based figure-of-merit to pick an optimal choice for the design of ET.
  • Evaluate the data analysis requirements and study if computational cost is a limiting factor in meeting the science goals.

Sub-group of WP4

The activities of WP4 will be carried out under the following subgoups:

  • Compact binary coalescences
  • Binary neutron stars

Additional information