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6) What is Hawking’s theory of dark matter? Discuss the recent findings and their significance. (250 words)

Topic: Science and Technology- developments and their applications.

6) What is Hawking’s theory of dark matter? Discuss the recent findings and their significance. (250 words)

The hindu

Why this question:

Recently a group of scientists have ruled out Stephen Hawking’s theory for mysterious dark matter. Dark matter remains one of the biggest mysteries in physics. Scientists know the mysterious substance makes up the majority of all matter in the universe, vastly outnumbering normal matter like stars, planets, and people. But no one is sure exactly what it is. Thus it is important for us to ponder a bit on such a theory.

Key demand of the question:

The answer must discuss in detail the theory proposed by Stephen Hawking and recent findings that justify the theory to some extent, one has to bring out the significance of such a finding in detail and what applications it bears in day to day life.


DiscussThis is an all-encompassing directive – you have to debate on paper by going through the details of the issues concerned by examining each one of them. You have to give reasons for both for and against arguments.

Structure of the answer:


Briefly discuss  the context of recent findings; the theory, its association with  black holes and Dark matter.


Discuss the following points :

  • What do the latest findings justify ? – researchers from the Kavli Institute for the Physics and Mathematics of the Universe (IPMU) in Japan has searched for the telltale sign of such minuscule black holes, and the result was pretty damning.
  • What did Stephen Hawking propose? – Stephen Hawking proposed a theory that primordial black holes are a source of dark matter. He computed that the mass of the primordial black holes could range from as low as one-hundredth of a milligram to as high as more than the mass of a thousand Suns.
  • What are primordial black holes? – Two Soviet physicists, Yakov Borisovich Zel’dovich and Igor Dmitriyevich Novikov, showed that at the initial instant of the big bang, the densities would have been very high at many points, resulting in the formation of small black holes. They were named `primordial black holes’.
  • What is dark matter?
  • Significance – applications such as Gravitational lensing etc.


Conclude with significance of such remarkable research.