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blog physica interesting topics and resources in physics blog physica blog physica chladni plates wednesday oct 3 2007 fun puviyan nambi 3 10 am 4 responses supersymmetry on lattice an introduction wednesday jul 4 2007 mathematical physics and particle physics and quantum field theory and symmetry puviyan nambi 7 00 am last week i gave a presentation titled supersymmetry on lattice an introduction pdf as a part of a course on lattice field theory it was an attempt at outlining the broad issues that arise when one tries to put supersymmetry in lattice i have uploaded the presentation in the link above readers comments and criticisms are welcome leave a response feynman on the relation between physics and mathematics sunday jun 24 2007 fun and mathematical physics and online talks puviyan nambi 6 59 pm 2 responses an interesting experiment monday apr 2 2007 electromagnetism and fun and physics puviyan nambi 12 11 am via madhur 2 responses atmosphere of exoplanets sunday feb 25 2007 astronomy and astrophysics puviyan nambi 7 00 am from a nasa press release this week nasa s spitzer space telescope has captured for the first time enough light from planets outside our solar system known as exoplanets to identify molecules in their atmospheres spitzer a space based infrared telescope obtained the detailed data called spectra for two different gas exoplanets called hd 209458b and hd 189733b these so called hot jupiters are like jupiter made of gas but orbit much closer to their suns the data indicate the two planets are drier and cloudier than predicted theorists thought hot jupiters would have lots of water in their atmospheres but surprisingly none was found around hd 209458b and hd 189733b according to astronomers the water might be present but buried under a thick blanket of high waterless clouds those clouds might be filled with dust one of the planets hd 209458b showed hints of tiny sand grains called silicates in its atmosphere this could mean the planet s skies are filled with high dusty clouds unlike anything seen around planets in our own solar system the more info page on the press release links to two papers a spectrum of an extrasolar planet by l jeremy richardson et al and a spitzer spectrum of the exoplanet hd 189733b by c j grillmair et al apart from some podcasts and via ba blog we are reminded that twenty years ago astronomers witnessed one of the brightest stellar explosions in more than 400 years the titanic supernova called sn 1987a blazed with the power of 100 million suns for several months following its discovery on 23 feb 1987 of course the article doesn t quite spell it out that the neutrino detectors were telling us something interesting three hours before the explosion was seen see this link too via backreaction blog rings left by the supernova explosion 2 responses a question in geography sunday feb 18 2007 mathematical physics braininavat 11 19 pm a theorem in topology says for every continuous map there exists a pair of anitpodal points and in such that specializing to the case one might conclude that at any point of time there are two antipodal points on earth s surface which is homeomorphic to having same say pressure and temperature which together constitute of the theorem question isn t it that the presence of polar caps the arctic and the antarctica where the day night variation in temperature is quite low may then be looked upon as a kind of consequence of this theorem ofcourse the theorem doesn t say where is located but at almost all other regions on earth s surface the antipodal points are expected to have quite different temperatures due to day night variation ps1 one might worry about the validity of the assumption of continuity of and since there are wild local fluctuations but i feel once you coarse grain things out this is a reasonable assumption ps2 for proof of the theorem see http www mi ras ru scepin elem proof reduct pdf 5 responses latex at last illustrated with a gr calculation sunday feb 18 2007 general relativity and meta and physics blogs puviyan nambi 7 35 am after waiting for long blogphysica gets see the announcement at the wordpress com blog the basic syntax is latex latex equation you can find a list of symbols here pdf in particular if you find the formulae are too small try latex displaystyle latex equation it s great update 18 02 07 see this faq for some more options now to illustrate latex i ll take up a particular problem consider two equal masses falling towards each other as shown below starting from rest m o m the question is this how much power does this system lose as the two masses fall towards each other let be the distance from the centre of mass which i ve denoted by an o above and i choose it to be the origin take the common axis to be z axis hence the position of two masses are respectively and to the zeroth approximation newtonian mechanics tells you that we neglect the effect of gravitational wave on the masses the quadrupole moment of a mass distribution is defined by where the integral is done over the whole source is the mass density of the source it is basically negative of the traceless part of the moment of inertia the einstein formula for the power emitted by the source in the form of gravitational waves is where the symbol denotes a sum over assuming that the masses are small in size the components of quadrupole moment in this case are now to calculate the third time derivative we first use chain rule to get we can now employ newton s law to get this leads to all the other components are zero substituting this into the einstein s formula which i quoted above the total power radiated comes out to be which is terribly small in most cases 4 responses classical mechanics and differential geometry friday feb 9 2007 classical mechanics and chaos and mathematical physics sujan 4 51 pm differential geometry and hamiltonian mechanics pdf after learning basic concepts of classical mechanics a wierd question arises about mathematical approach to this field the general approach goes like this differential manifold structure is associated with lagrangian and symplectic structure comes with hamiltonian we tried to learn this so i am attaching project report more like a formula sheet with topic differential geometric treatment to hamiltonian mechanics please go through this and post some views on this mathematical approach one response boulder school lecture notes thursday jan 18 2007 condensed matter physics and lecture notes review articles and quick links braininavat 11 38 pm i found a school website containing lecture notes on various topics in condensed matter so thought of posting here boulder school most of it look quite well organized for independent reading leave a response physics blogspeak part ii sunday jan 14 2007 astronomy and astrophysics and particle physics and physics and physics blogs and quick links puviyan nambi 6 45 am cosmos reveals the cosmos from cosmic variance by sean the internet works so that we don t have to this week is the big annual meeting of the american astronomical society in seattle so expect to see a series of astro news stories pop up all through the week the first one concerns a new result from the cosmological evolution survey cosmos they ve used weak lensing to reconstruct a three dimensional image of where the dark matter is aas report 3 things that go boom from bad astronomy blog it s a fact of life that some stars explode actually it s a good thing when stars explode they create and scatter the heavy elements that create us the iron in your blood and the calcium in your bones were created in a supernova so it s important to study these objects so we can better understand our origins but it s also fun stars explode bang cool today there were three press releases about supernovae all three were surprising to me and pretty interesting 1 kepler s supernova was a type ia ok so that title doesn t thrill you but that simple statement is actually the answer to a long standing mystery ready for this ok sit back the aas a nerd s eye view from galactic interactions i m in seattle at the moment i flew in yesterday it s cold windy and rainy in fact the rain was looking kinda slushy last night while my wife from minnesota might scoff at my calling this cold it was just below freezing in nashville it s been march like temperatures i m here for the 209th meeting of the american astronomical society i m going to try an experiment i ve never done the live blogging thing before and indeed it s entirely possible that i m not using the term properly it is my intention to post several posts this week inspired by things i see at the aas i can t tell you what they will be yet because they haven t happened i m hoping mostly to focus on interesting science and such but anything that inspires me to blather is fair game as far as i m concerned other posts in this series come on in the methane s fine from uncertain principles by chad orzel the times has an article announcing the discovery of methane lakes on titan cdf s new results w boson mass and top quark mass from quantum diaries 1 and the w mass is 2 a summary mw mt plot for christmas 2006 3 more thoughts on the w mass 4 a new precise top mass measurement with jets 5 the new number leave a response next page pages about books and reviews under construction classical mechanics condensed matter physics field theory mathematical physics quantum mechanics statistical mechanics faq first draft how to post in this blog physics resource letters meta create account log in entries feed comments feed wordpress com search for latest comments separate paragraph on does position operator generat jrmf on how to talk to a physicist gr johnny on latex at last illustrated w rajguru on an interesting experiment citesteasta on chladni plates top posts chladni plates supersymmetry on lattice an introduction feynman on the relation between physics and mathematics an interesting experiment atmosphere of exoplanets a question in geography latex at last illustrated with a gr calculation classical mechanics and differential geometry boulder school lecture notes physics blogspeak part ii recent posts chladni plates supersymmetry on lattice an introduction feynman on the relation between physics and mathematics an interesting experiment atmosphere of exoplanets archives october 2007 july 2007 june 2007 april 2007 february 2007 january 2007 december 2006 november 2006 october 2006 september 2006 july 2006 june 2006 may 2006 april 2006 march 2006 categories astronomy and astrophysics biophysics blogroll classical mechanics and chaos condensed matter physics electromagnetism fluid mechanics fun general relativity lecture notes review articles mathematical physics meta nuclear physics online talks particle physics physicists life physics physics blogs physics education and outreach physics journals quantum computation quantum field theory quantum mechanics quick links statistical physics symmetry administrators ajay bhujyo jeet nayagam tom ntveem ravishankar s shanth sujan tarun grover blogroll wordpress com wordpress org physics blogs cosmic variance mixed states physics journals ajp arxiv august 2026 s m t w t f s 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 oct blog at wordpress com subscribe subscribed blog physica sign me up already have a wordpress com account log in now privacy blog physica subscribe subscribed sign up log in report this content view site in reader manage subscriptions collapse this bar design a site like this with wordpress com get started