Recent Posts - page 5

  • My graduate student days.

    My graduate student days were fun — most of the times.

    I had 3 different professors — in 3 different semesters, when I was their teaching assistant (TA).

    None of them was any acerbic to me ever, even when I would be at fault.

    Professor 1:
    Guy Indebetow was the very first one. A cheerful person and very friendly. He would say — in spirit, not necessarily all the wording, “I would not interfere in how you grade the students, but wisdom says you give them a little lose marking, if anyone comes with any grievance though, I would redirect them to you.”

    It so happened that the only students that would come banging on my doors are the ones who would often just seek some more marks, than “deserve it”. — I am not speaking from their POV though, I wasn’t taking theirs — you see.

    I remember two cases.

    Case-1
    A student who was originally from Pune. He would come looking for some marks.

    Me: I am sorry you don’t deserve more here.

  • Can a black-hole be created on earth by LHC?

    This post belongs to the eschaton theme. Which means a small and swift blog post just to do justice to something that can’t be made comprehensively large by any reason, at the moment. 

    Read the linked news article which giving excerpts from a book by the famed Martin Rees which I haven’t read, nonetheless which sound very tenuous on the scientific merit its purported to be based on, claims that particle physics experiments can create black-hole catastrophes on earth in the very unfortunate event that something goes wrong.

    Here is my initial reaction to the article. 

    “apocalypse mongering”

    Earth’s Schwarzschild radius is less than 1 cm. What that means is earth needs to be compressed into a sphere of that radius with its current given mass, for it to turn into a black-hole.

  • Falling Masses, the Big Picture.

    This lecture note will make your life ten-fold easier in the scope of the problems it addresses. Consider it a talisman. I discovered this a couple of weeks ago when I was solving these problems for my own conceptual understanding. So I waited till I can completely enunciate the big picture. When I confirmed that its valid for all the following problems I made this note and sharing with you.

  • There is nothing there.

    According to classical mechanics — from 400 year old knowledge of physics, space and time have been considered to be separate entities but not fundamental. Space and time were not considered fundamental quantities as these parameters did not have the mandate to change physical laws of nature. They were merely the tools of the mind or the more aptly the conscious mind. They help us visualize but not dictate what ought to happen.

  • Gravitational Anomaly

    Pencils could be balanced on each other in this fashion, only if we didn't have the kind of gravity that we have now.

    Gravitational Anomaly: (asked by a student for very simple explanation)

    Basically it means the new laws of physics known as Quantum Mechanics invalidates the sanctity of nature’s principles or laws (that is QM brings exceptions to the validity of the physical laws of nature itself)

    Let us discuss this in simpler ideas from the basics only.

    Remember the most basic physics, that of principle of conservation of energy and the principle of conservation of (linear) momentum.

    In the more rigorous formalism of physics these two principles emanate (that is derivable) from two ideas of symmetry. In-fact every conservation principle of physics are manifestations of a corresponding principle of symmetry and vice-a-versa (also every symmetry must correspond to a conservation law). This general idea of connection between conservation laws and symmetry is collectively known as Noether’s theorem and is a central underpinning in all of today’s conceptual physics.