Types of gravitional waves

1. Welcome

2. Name – Shravani Somnath survase
Course – S.Y.B.Sc.B.Ed ( 4 semester)
Subject – Oscillations, Waves and
sound .
Topic name – Types of gravitational
waves.

3. What are Gravitational Waves?
 Gravitational waves are ‘ripples’ in space-
time caused by some of the most violent
and energetic processes in the Universe.
 Albert Einstein predicted the existence of
gravitational waves in 1916 in his general
theory of relativity

4.  LIGO scientists have defined four categories of
gravitational waves based on what generates
them:
1) Continuous
2) Compact Binary Inspiral
3) Stochastic
4) Burst.
 Each category of objects generates a unique or
characteristic set of signal that LIGO’s
interferometers can sense,

5. Continuous Gravitational Waves
Continuous gravitational waves are thoughtto beproducedby a
single spinning massive object like a neutron star.
Any bumpson or imperfections in the spherical shapeof this star
will generate gravitational waves as it spins.
If the spin-rate of the star stays constant,so too are the gravitational
waves it emits.
Thatis, the gravitational wave is continuouslythe same frequency
andamplitude (like a singer holding a single note).That’s why
these are called “ContinuousGravitational Waves”.

6. Continuous Gravitational Waves

8. Compact Binary Inspiral Gravitational
Waves
 The nextclass of gravitational wavesLIGOis hunting for is CompactBinary
Inspiral gravitational waves.So far, all of theobjects LIGO hasdetectedfall
into this category.Compactbinary inspiral gravitational wavesareproduced
by orbiting pairs of massive and dense(“compact”)objects like whitedwarf
stars, black holes, and neutron stars.There arethree subclassesof “compact
binary” systemsin this categoryof gravitational-wave generators:
 Binary NeutronStar (BNS)
 Binary Black Hole(BBH)
 NeutronStar-Black Hole Binary (NSBH)

9. Each binary pair creates a unique patternof gravitational waves,
butthe mechanism of wave-generationis the same across all three.
Itis called “inspiral”.
Inspiraloccurs over millions of yearsas pairs of dense compact
objects revolvearound each other.As they orbit, theyemit
gravitational waves thatcarryaway some of the system’s orbital
energy.


10. Thank you