Friday, April 28, 2017

Lord of the Rings

The Cassini spacecraft dove through the rings of Saturn yesterday, and sent back its first pictures today. Here you are. These are raw images, and have not been prettified like the Juno pictures. That makes the cyclopean eye of the hurricane even more petrifying!

The other  pictures appear to be a close up of the hurricane, and perhaps a Saturnian cloud formation. Many more pictures are expected before Cassini plunges to its fiery death on 15 th  September. It is hoped that its fiery incineration will keep it from contaminating the Saturnian environment with earthly debris, and even worse, earthly bacteria. We plan to update this post  with  more Saturnian pictures, but hopefully, with no earthly bugs in sight.

This blog post is by Neelima Gupte and Sumathi Rao.

Sunday, April 2, 2017

Juno and Jupiter 2

Who is the best photographer in the universe? Juno, of course, helped by the magnificent  planetscape it is visiting, and some help from digital enhancement by human hands. The Juno spacecraft of NASA, on its fifth flyby by Jupiter, has sent back stunning pictures on Monday.  Here are two pictures from the flyby

followed by a composite image, composed over four months;

and, not the usual red spot, but a local storm.

Just for comparison, an old one from Voyager 1, also a composite picture ( a similar picture by New Horizons was posted on this blog earlier).

Finally, just for the heck of it, do you think Van Gogh did better?

This blog post by Neelima Gupte and Sumathi Rao.

Photos: NASA (Juno Images), Bhagyashree Gupte (Starry Night photo).

Sunday, March 5, 2017

Rahul Basu 04/03/1956-05/03/2011


Memory can tell us only what we were,
In company with those we loved;
It cannot help us find out what each of us,
Alone, must now become.
Yet, no person is really alone;
Those who live no more still echo
Within our thoughts and words,
And what they did has become
Woven into what we are. 

Richard Fife.

This blog post by Neelima Gupte and Sumathi Rao.

Wednesday, January 4, 2017

The IPA Rahul Basu Memorial Award Ceremony, 2016.

The  IPA Rahul Basu Memorial Award ceremony was held at the 22nd DAE  symposium in High Energy Physics  at the University of Delhi on December 16th, 2016. As mentioned in an earlier post, the award winners were Dr. Bhawna Gomber and Dr. Roji Pius, and Dr. Md. Rihan Haque and Dr. Kirtimaan Mohan had received honourable mention.

Dr. Bhawna Gomber gave a very clear and well argued talk on her thesis which primarily concerned the analysis of what could be construed as signatures of dark matter at the LHC, and also the comparison of the observed data with an alternate scenario, the  signatures of extra high dimensions via theoretical models. A major contribution of the thesis was the derivation of model independent bounds on the cross sections. It was especially delightful that Dr. Bhawna could present her talk in person, and receive her award from Prof. Probir Roy, a long standing leader of the HEP community.

Dr. Md. Rihan Haque, presented his talk via Skype. Dr. Haque presented his work on the STAR experiment, where he had analysed the beam energy dependence of the  physical properties light nucleii to understand their production mechanism. Since coalescence processes are important for light nucleii as well as for hadrons, this helps to understand hadronization
in high energy nuclear collisions.

Dr. Roji Pius had received the award for important technical contributions to the perturbative analysis of string theories. Dr. Roji's thesis  studied various aspects of the problem of mass renormalization in string theory including the computation of  the mass of a spinor in  heterotic string theory, and analysed its stability. He also developed the general algorithm for computing the renormalized mass
in string theory, which  goes  beyond the conventional approach. His video recorded talk did an admirable job of providing a flavour of these highly technical results in accessible terms. Unfortunately, this video could not be played due to system limitations. We hope to make this video accessible in a suitable forum.

Finally, Dr. Kirtimaan's thesis analysed various properties of the Higgs boson at the LHC. A special feature of his thesis has been the analysis of features of the Higgs Boson production that go beyond the conventional Standard Model. For this he has studied non standard decay modes, jet substructure properties and charge and colour breaking constraints.

The award ceremony went off well. It was particularly heart warming that it was held in Prof. Rahul Basu's alma mater, viz. the University of Delhi. This led to the presence of  supportive friends, collaborators and associates in the audience. The ceremony was preceded by talks on ongoing research problems by young HEP students. It is hoped that the talks of the awardees will have helped set the standards which will be reflected  in future nominations to this award.

Profs. Bedangdas Mohanty and Debajyoti Chowdhury, Chair and Member of the award committee were also present. Heartfelt thanks to them and other members of the committee for carrying out the herculean task of sifting through 30 nominations. Thanks are also due to the Indian Physics Association which administers the award. We hope the next round of the award will see equally enthusiastic participation from the HEP community of India.

This blog post by Neelima Gupte and Sumathi Rao.