Archive for October, 2017

Going Doolally

Posted in Biographical, History with tags , , on October 14, 2017 by telescoper

Yesterday evening, after my seminar and discussions I went with members of the cosmology group at the Tata Institute for Fundamental Research to a place called the Doolally Tap Room which is not far from TIFR. Thundery clouds had gathered and rain was in the air so we took a taxi there and back.

It’s a nice, modern-looking bar with a range of craft beers and food. The Belgian Witbier and Abbey Tripel went down well, but I wasn’t tempted to try Mango Cider. It was a very pleasant evening, but I was dog tired after it and crashed out as soon as I got back to the TIFR guesthouse.

The name Doolally Tap Room is a very clever name for a bar. The word Doolally (or sometimes Dolally), as it is used in English especially in `going Doolally’ etc, generally means `deranged’ or `crazy’ (often as a result of being confined somewhere involuntarily, rather like cabin fever), is thought to derive from Deolali a place in Maharashtra (the state which contains both Mumbai and Pune). Deolali was used as a transit camp for British Army soldiers waiting to be deployed, many of whom became extremely bored stuck there in the heat.

Interestingly though the original phrase describing the madness induced by such boredom was `Deolali Tap’ (the latter word from a Hindhi word meaning `fever’). Doolally Tap Room therefore works rather well as a play on words.

There are of course many words in contemporary English that have their origins in Indian languages: here are 50 of them, which may or may not surprise you: atoll, avatar, bandana, bangle, bazaar, Blighty, bungalow, cashmere, catamaran, char, cheroot, cheetah, chintz, chit, chokey, chutney, cot, cummerbund, curry, dinghy, doolally, dungarees, guru, gymkhana, hullabaloo, jodhpur, jungle, juggernaut, jute, khaki, kedgeree, loot, nirvana, pariah, pashmina, polo, pukka, pundit, purdah, pyjamas, sari, shampoo, shawl, swastika, teak, thug, toddy, typhoon, verandah, and yoga.

Reminded by the above old British Army connection with doolally I can’t resist mentioning the phrase `When I was in Poona…‘. One doesn’t hear it much these days but aficianados of older humorous novels and radio comedy will recognize it as a kind of catchphrase introducing a boring old ex-soldier. It appears thus in Eric Patridge’s Dictionary of Catch Phrases (2003):

The legacy of Pune’s past as a large British Army base is still apparent: a large area in the centre is still called `Camp’ and there is still a tendency among some to refer to non-vegetarian restaurants as `Military’ (though I’m told this is more the case in Southern India, where the traditional local food is entirely vegetarian). In Maharashtra the diet is very mixed, but I’ve eaten relatively little meat since I came here.

All of which rambling might suggest that I’ve gone Doolally, or indeed that I’m turning into an old bore, but I’m actually enjoying this trip very much indeed. It’s fascinating not only to see what has changed in India in the 23 years since I was last here, but also what has remained the same. Moreover, everyone I have met here has been so friendly and hospitable that it’s been an absolute pleasure all round.

Gravitational Waves Flash!

Posted in The Universe and Stuff with tags , , , , on October 13, 2017 by telescoper

I got up early this morning to hitch a ride in a car to Mumbai so that I can give a talk this afternoon. We left Pune about 6am and got here about 8.30 so the trip was a quite a bit quicker than coming here! I’ll post about that and include some pictures when I get a moment, but first I’ll post a quick announcement.

There will be an announcement on Monday 16th October at 10am EDT (3pm BST; 7.30pm in Pune) by `the National Science Foundation (NSF) as it brings together scientists from the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo collaborations, as well as representatives for some 70 observatories’. Further details can be found here. The European Southern Observatory has also announced that it will be holding a press conference on Monday about an `unprecedented discovery’.

The fact that it involves LIGO, Virgo and representatives of other observatories strongly suggests that this announcement will address the subject of the rumours that were flying around in August. In other words, it’s likely that on Monday we will hear about the first detecting of a coalescing binary neutron star system with an optical counterpart. Exciting times!

I’ll be back in Pune by Monday and will probably be able to watch the announcement and will update if and when I can.

Post-Planck Cosmology: Day 4

Posted in Talks and Reviews, The Universe and Stuff with tags , on October 12, 2017 by telescoper

So here we are at the end of the meeting, after a fourth and final day of wide-ranging cosmology talks. I did the first presentation at 9am. I won’t summarize my own lecture because you can find the slides here:

Here are two pictures of me in action:

me_2

me_1

After that we had, amongst others, invited talks by Subhabrata Majumdar on the eROSITA all-sky X-ray survey and Somak Raychaudhury (Director of IUCAA) on large-scale structures in the local universe, Kandu Subramanian on primordial magnetic fields and Anvar Shukurov on Probabilistic Topology and Morphology (a change to the advertised title). There were also a number of shorter talks of diverse nature mainly on the subject of large-scale structure and galaxy formation.

I have known Kandu Subramanian since I was a student at Sussex and he was a postdoc there. At that time he was working mainly on gravitational lensing. I haven’t seen him for quite a long time and was surprised to see that now his hair has gone completely white. That’s what happens to you if you work on primordial magnetic fields.

The afternoon session overran and I had an appointment for Skype call so I had to leave before the closing remarks, so let me take this opportunity to thank the conference organisers for putting together such an interesting meeting and especially for inviting me back to Pune after all this time. It has been very enjoyable.

Many of the conference guests have already left and some are leaving tomorrow. I am staying in India for a few more days, however. Tomorrow morning I’m going to Mumbai to give a talk at the Tata Institute for Fundamental Research. I have to get up early tomorrow for that trip so I think I’ll take an early night.

Post-Planck Cosmology: Day 3

Posted in The Universe and Stuff with tags , , , , on October 11, 2017 by telescoper

Before carrying on with my daily updates from this meeting on Post-Planck Cosmology I’ll just remark that this is a great venue: it has all the facilities necessary to keep a group of cosmologists happy…


At the tea break this morning I managed to find a shot that included all four of the statues in the main quadrangle too:

This morning kicked off with Roy Maartens discussing the cosmological potential of the Square Kilometre Array and other future galaxy surveys, one of his main points being the benefit of using multiple tracers to beat down some of the problems with single surveys.  The first phase of this project, SKA1,  will deliver 10 million redshifts with z<0.6. With SKA2 that will go up to 1 billion galaxies out to z<2, but many things can be done without redshifts using intensity mapping. SKA1 is some way off, but the precursor `Meerkat' consisting of 64 × 13.5 metre dishes will be hopefully starting next year in South Africa.

We then had a series of talks about reionization and the formation of the first stars, an epoch usually referred to as `Cosmic Dawn' or `First Light', taking us into lunch.

In the afternoon we had talks loosely grouped around the theme of `classical cosmology' – using geometric or other probes to study the expansion history of the Universe. This session included a talk by Chris Messenger of the LIGO collaboration about the beginnings of gravitational wave cosmology, though as the current generation of detectors is only sensitive to relatively nearby sources for the time being the main effort will be devoted to distance scale measurements, attempting to measure the Hubble constant directly without the need for the traditional distance ladder.

The last part of the day was devoted to a panel discussion, chaired by Francois Bouchet that was interesting and wide-ranging but largely motivated by responses to Paul Steinhardt's talk last night.

Now, no conference dinner to tear me away tonight – but I do have to finish my talk, which is at 9am tomorrow – so that will have to do for now. Toodle-pip!

Memories of Mumbai

Posted in Biographical with tags , , on October 11, 2017 by telescoper

My first trip to India was in early 1994 and I passed through Bombay (as it was then called) on my way to and from Poona (Pune). My flight from London to Bombay arrived at about three o’clock in the morning and I was greeted outside the immigration area by a young man holding a sign with my name on it who had my train tickets for the next leg of the journey. The train didn’t leave until 6.30am so he asked me what I wanted to do until then. I said I thought I would just go to the station if it was open and wait there. He looked surprised, but said that, yes, the station was open all night. He then kindly offered me a lift in his car as he was heading home and would be going roughly in that direction.

When we got to Bombay Victoria I realised why he had been surprised. I had assumed the station would be fairly empty and I might be able to sleep on a bench or something. When I walked into the concourse it was jam-packed with people sleeping all over the floor. I wandered in sheepishly, the only westerner to be seen, and started to look for what platform my train would be leaving from. Immediately I was surrounded by beggars – women with small babies, cripples, people with gruesome scabs and sores – all pushing me around and pleading for money. Then a teenage boy tried to lift my walkman from my pocket and I started to feel not just uncomfortable but scared.

Pretty soon, though, an official from the State Railways saw my predicament and came to my rescue. Delivering numerous clips around ears he speedily liberated me from my oppressors, took me to into a small kiosk situated on the platform, and offered me a cup of tea. It had far too much sugar in it, but I drank it gratefully anyway. He asked me where I was going, and I told him. He was initially suspicious, I think, because the primary place westerners tended to visit in Pune those days was the Ashram run by Bhagwan Shree Rasjneesh where his disciplines were encouraged to participate in unrestricted sexual activities. When I told my friend from the railways that I actually going to visit IUCAA, which at that time was run by the famous Professor Narlikar, he beamed with relief. I think he wasn’t unique amongst Indians who thought that Rasjneesh was a fraud and his disciples gullible idiots.

It turned out that the train I was to take to Pune was actually already in the station but was being cleaned. Since they cleaned the first class compartments first, I was allowed to get on the train early, about 4.30, and immediately nodded off. I only woke up when the train pulled out of the station and started on its journey up towards the Deccan plateau.

I enjoyed the journey enormously, partly because the train was slow enough to allow me to take in all the sights, and partly because I was sharing a compartment with a very friendly Indian couple (a professor of engineering and his wife). They had done the customary thing when on a long railway journey in India, which is to consult the list of passenger names posted on the platform before the train left the station. When I woke up as the train left the station, they greeted me by name and introduced themselves. It was a refreshing change from the United Kingdom, where it is apparently forbidden to talk to strangers on a train.

I stayed about a month in Pune working with a colleague, Varun Sahni, on a lengthy article for Physics Reports. When that was over I had been invited to visit the Tata Institute for Fundamental Research in Bombay for a few days on my way home, so I got the train back to Victoria. Arriving on time, I left the train to be confronted by a crowd of small boys who tried to convince me that there were no taxis but that they would arrange one for me for a price of 200 rupees. That was way over the odds for a taxi (at the time) so I laughed and said no thanks.

Proceeding out of the station to the taxi rank, I realised that they had been telling the truth. All the taxis in Bombay were on strike that day. I started to panic. How am I going to get to TIFR? Then I remembered that I was to have asked the taxi driver for “Navy Nagar Bus Stop”, which is right next to the guest house I was supposed to stay in.

I thought that if there’s a bus stop there must be a bus, so I found a policeman and asked him where the buses went from. He gave me very clear directions and told me I needed the Number 11. I found the stop without much difficulty, but then there was a hitch. The buses themselves were red double-decker Routemaster types just like those you could find in London. Unfortunately, though, the numbers were written in Marathi script which I couldn’t read. Only when a bus went past did I see that the arabic numerals “11” were written on the back. A few minutes later I was joined at the bus stop by an Indian guy so I asked him if he could tell me the numbers of the buses as they came into view. He asked me where I was going, so I told him and it turned out he was going there too. Sorted.

On the bus I sat with my luggage around me and the front of the lower saloon facing backwards. All the locals peered at me like I was an exhibit in a museum, but most of them smiled. A couple of stops into the journey an old man got on wearing a scruffy coat. He looked rather poorly and had some sort of skin condition. He sat facing me and started scratching himself through his coat. I started to feel quite uncomfortable because this performance went on for some time. Then he started to unbutton his coat as if he was going to take it off. It was then that I realised the cause of his discomfort as a chicken poked its head out.

The bus was quite slow and the journey quite long so, when I finally got to the TIFR guest house, it was quite late. When I found the building, I was pleased to see my host, a physicist called TP Singh, in the lobby talking on the phone. He had his back towards me and was in the middle of a heated conversation, so I waited until he had finished before introducing myself. After a few minutes he put the phone down and turned around, so I offered my handshake and said hello.

He had a look of complete confusion on his face which gradually gave way to relief. “Peter!”, he shouted. “How did you get here?”

I got the bus, was my answer. It turned out he had found out in the afternoon (when I had already left Pune) that there would be no taxis,  so he had sent the TIFR car and driver to meet me at the station. I hadn’t seen the driver amongst the crowds and wasn’t expecting to be met anyway. In those days I didn’t have a mobile phone so there was no way of warning me about it. After scouring the station, the driver had returned to TIFR and reported that I was missing. When I had arrived at the guest house, my host had actually been on the phone to the local police in order to report me lost.

It was during this short visit of three days or so before flying back to London that I behaved as a tourist although I was taken around by students and staff from TIFR which was nicer than the more usual guided tour. I visited the Gateway to India, had tea at the Cafe Leopold, and took a boat to Elephanta Island.

Mumbai (as it is now called) is an enormous, bustling city in which extreme wealth and abject poverty can be found in close proximity and where religious tensions are never far away. Riots are fairly commonplace and there are powerful grievances between the different social groups and claims of police corruption. The sheer scale of the place means that no casual visitor can hope to understand what it  is really like to live. But my visit there left me with an impression of a city full of energy and determination in which there is much kindness to be found not far below the surface.

 

 

Post-Planck Cosmology: Day 2

Posted in The Universe and Stuff with tags , , on October 10, 2017 by telescoper

Just finished the last session of the day and it’s only half an hour before the conference dinner begins, so I’ll just do a brief summary.

The weather in Pune continues to be `interesting’:

It’s pouring down at the moment, in fact. The session I chaired started late because we had to postpone the conference photograph because of inclement weather.

Anyway, this morning’s talks were primarily about the difficulties of measuring B-mode polarization in the cosmic microwave background. Carlo Baccigalupi gave a perspective on foregrounds from Planck and Zeeshan Ahmed updated us on Keck/BICEP progress. There are no new results from the latter – we’ll have to wait for data from the extra 220 GHz channel – but Zeeshan also spoke about a proposal for the next generation ground-based experiment, glamorously named CMB-S4 – details of which can be found here.

The afternoon was largely devoted to early universe physics, including inflation. We’re only two days in to the conference but already several speakers have showed this plot (from here), which shows the extent to which current cosmological data disfavours various inflationary models:

Some are disfavoured, but clearly there are still lots of viable models! Too many!

For the final session of the day we were joined by Paul Steinhardt via Skype from the USA. He gave a very cogent and stimulating talk arguing that the prevailing paradigm (i.e. inflation) was about to be overturned. I don’t have time to do a full summary of his contribution, but you can check out a previous post about some of the issues he raised, and here’s a picture of the last slide of his presentation:

Anyway, that will have to do. The conference dinner beckons.

Post-Planck Cosmology: Day 1

Posted in The Universe and Stuff with tags , , , on October 9, 2017 by telescoper

Well, I’m just back to my guest flat from a pleasant birthday party for one of the conference organizers, Tarun Souradeep, is now in the same decade as me! I don’t have time to write about all the talks today so apologies to anyone I don’t mention by name. I also got called away to have tea with an old friend so missed the final session and consequently missed the last session. I can’t do that again tomorrow as I’m chairing the last session tomorrow (including a presentation from Paul Steinhardt via Skype).

Also, I forgot to take my camera to today’s session so here are a couple of pics that I’ve stolen without permission from the Director of IUCAA, Somak Raychaudhury showing Francois Bouchet and Jacques Delabrouille who gave the first two talks.

Here are some brief notes.

Francois Bouchet delivered an expert summary on the state of cosmology up to and including the Planck mission. He started by saying out that before the discovery of the cosmic microwave background, cosmology was a `semi-crackpot subject’ and went on to show how much the field has moved on: there are no longer any semi-crackpots in cosmology. Three particularly interesting points he made on his grand tour were: (i) that the `inflationary prediction’ that the spectral index of primordial density fluctuations is not that n=1 (which was argued for before inflation by Harrison and Zeld’dovich) but n=0.96, and that the difference between these numbers is very significant; (ii) there aren’t enough independent modes in the (2D) CMB to improve current limits on non-Gaussianity by much so we will have to use (3D) galaxy clustering data; and (iii) the apparent `tension’ in measurements of the Hubble constant is not solely a problem with the CMB (he mentioned this paper in particular.

Next up, Jacques Delabrouille spoke about future CMB space missions. Unfortunately none of the three putative missions currently on the table (LiteBIRD, CORE and PIXIE) has been selected for Phase A by the relevant space agencies. Although not officially dead, any of these will need to find international partners to proceed, and none will be launched for at least a decade. The current generation of CMB scientists will therefore probably have to rely on ground-based data for the immediate future. However, he was ambitious in the science goals for future missions: `we want to measure it all!’

We then had a series of talks about various matters, including the resurgence of interest in spectral distortions of the CMB that I blogged about recently.

Anyway, that will do for this evening. I’ll try to post about Day 2 tomorrow, though it is the conference dinner in the evening so I may not be in a fit state!

Post-Planck Cosmology

Posted in The Universe and Stuff on October 9, 2017 by telescoper

I slept in a little this morning as my alarm didn’t go off. It turned out I’d set it to 7pm instead of 7am. Not a great start to the conference!

Anyway, we’ll soon be starting this meeting so I thought I’d post the conference poster.

I’ll try to post summaries of each day if I get the time in the evenings.

Now, time for breakfast!

Return to IUCAA

Posted in Biographical, The Universe and Stuff with tags , on October 8, 2017 by telescoper

This afternoon I roused myself from my slumbers and took a stroll around the campus of the Inter-University Centre for Astronomy and Astrophysics (IUCAA). You can read more about IUCAA here.

I was last here in 1994, at which time I was working with Varun Sahni on a long review article for Physics Reports. We didn’t quite get it all finished during the month or so I was here then, but it was submitted the following year.

Given that was over twenty years ago it shouldn’t really be a surprise that I don’t remember the place all that well, but in fact it has changed quite considerably with lots of new buildings. I’m not staying in the guest accommodation area I was in last time, but in a new part just round the corner. I’ve got a small apartment, actually,including a kitchen but I think I’ll be eating at the refectory most of the time.

Anyway, here are some snaps of parts of the IUCAA complex I did recognize:

There are four statues in the main quadrangle which is featured in the first three pictures. These are of:  Sir Isaac Newton (seated under the tree), Albert Einstein (standing with hands in pockets); Galileo Galilei (in the robe with arms akimbo); and Aryabhata the great Indian mathematician-astronomer. It’s quite hard to get all four into one picture, even from the roof!

Anyway, there’s dinner and drinks coming up at 7.30 so that’ll do for a first post. The meeting starts tomorrow morning and I’ll try to tweet/blog about interesting bits until it finishes at the end of the week. The meeting is called Post-Planck Cosmology: Enigma, Challenges and Visions, so I’ll try tweeting with #PPCIUCAA2017 as the hashtag and see if it catches on!

A Passage to India

Posted in Biographical, Uncategorized on October 7, 2017 by telescoper

So. Here I am at Gate A10 at Heathrow Terminal 5 waiting to board a flight to Mumbai whence I shall be travelling to Pune for a conference on cosmology at which I’ll be giving an invited talk.

I’ll be back online when I get to the other side, but for the time being there will be a short interruption…

..it’s 2.30am tomorrow local time, but still 10pm today UK time. The driver who is taking me from Mumbai to Pune has stopped the car and  is having a short break as we’ve still got another couple of hours to go.

Well, I finally made it to IUCAA about 4.30 in the morning local time (midnight UK time). After doing the paperwork I was led to my guest room and then crashed out. It’s now about 12.45 and I’ve only been up an hour! My body clock must still be on UK time!

Although the Boeing 767 that brought me to Mumbai was very full, the trip was relatively smooth and on schedule. I have to admit that my heart sank when I saw how crowded the immigration hall was. That’s not really what you want to see after a long hour flight, but to be fair I’ve seen worse at Heathrow. Anyway, it took about an hour to get through the passport check etc and was then met by the driver of the car that had been sent to meet me.

It’s still monsoon time in this part of India and it was raining off and on but it was still warm when I left the terminal building, about 28 degrees in fact. It’s quite sunny today in Pune.

The car journey wasn’t quite long though mainly on an `Express Way’. At some point the volume of traffic made it quite scary, as my car dodged between heavy lorries. Lane discipline isn’t really a thing around here! I was thinking I might doze in the car but it was a bit of a white knuckle ride so I remained awake the whole time. That probably accounts for why I was so tired on arrival. Either that or I’m just getting old.