Einstein's Equivalence Principle

Equivalence principle is one of the logical experiments of Einstein. It helps to foundation of General Covariance Principle which is very important in physics. According to equivalence principle, the physics in an elevator falling freely on Earth and being stable in space are not distinguishable. When the observers in elevators drop a ball, ball would be hanged on the same height in the elevator. So the observer in the elevator can not understand where he is and he would not feel any weight.

The second version of this experiment is that a stable elevator on Earth and an upward moving elevator having g acceleration in space. When the ball is being dropped as before experiment, the ball would fall down with g in both elevators.

Consequently, gravitational fields and massless fields are LOCALLY equivalent. Note that this equivalence is broken in the case of big distances.

The next post I will discuss this locality issue.

#physicstoday

I took a huge brake after my pregnancy and my baby's birth. Today my little doughter is nearly 16 months old and i would like to start my studies again. In this period, sharing some posts about physics will be helpful to get my motivation again. This posts will usually be concerned about basic physics theorems, paradoxes and striking features of nature. So if you are new at physics, you can understand via this blog.

The picture above is one of the most important one in physics world. There are  most famous pysicists in one pose; Einstein, Planck, Schrödinger, Marie Curie, Heisenberg, Bohr, Dirac, Pauli, Lorentz taken in a conference in Brussels  on 1927.

ok then. Let's start to do physics :)

When time flows

Hi again. I usually forget the existence of this blog. Time is running fast. I am a bit different situation now from in my last post, being a phd. Yes, my thesis finished and I am working on three project at the same time, one is nearly finished, second one is still in progress and the last one is in the beginning level. Even though I am a bit tired of trying to catch everything, I am happy with that.

I hope I could write here more frequently. Soon...

A New Beginning

Hello there, if anyone is there of course.

There had been a long time to give up posting although here is nearly empty. Anyway, the last post is very hopeless but everything is changed. Now I am very close to finish my PhD thesis and I am in different country now and I am studying a new topic different from my thesis with very professional people. So this is a new beginning for my future life, it will be full of physics, new topics and excitements.

Me in a few words :

-have physics bachelor degree

-master of science in mathematical physics, theoretical cosmology, in the topic of effect of cosmological constant to evolution of Bianchi type models

-phd in brane world models

and new interest in black hole + accretion disk systems.

Nowadays I am on research of this my new interest. Although I have a broad knowledge about them, I need to link my knowledge within plenty of information in all around the books, webs.. etc. I must get a complete schemetic view to the structure of the system.

When I prepare to learn a new topic, I usually use some steps which help me to compose and to put every different parts together. Here it is:

-Start the elementary level of information. Wikipedia is a good source for this. Make sure that you can illustrate the mechanism exactly in your head using these definitions.

-Then ask questions. It doesn't matter how stupid they are. Just ask and try to answer. But again make sure that every answers fit well in your picture. Go on until you find the best fit.

-Talk yourself loudly and think opposite situations of definitions. If this wasn't so, what would be happened? for example. Thinking opposite situations helps to understand the topic better and why it cannot be in that way.

-Increase the level in every steps. When a step is completely understood, the next level comes out spontaneously. And try to pass from definitions to equations.

-Take notes. Every points you understand must be written in your personal text. Make a schedule in your style, add your comments on it.

-And when the all information is finished, think about open questions. Why did they remain unsolved and can you do anything for it?

I will try to post these steps for my new topic. What I did and how I progressed. I hope it will be helpful for me and anyone else interested.

Photo credit.

Hopeless Days

I am trying to study my thesis. Mostly, it is hard to concentrate because I am disturbed some behaviours and speculations around me. I will never understand what the others want me. I did not anything to hurt them, I never talk behind them. I am a lonely, harmless girl. What do you want from me.

I already know the answer. I am very succesful every work what I have done. As a song lyrics says:

"The reward of victories is aloneness."

My god, please be aware of me...

ABOUT THIS BLOG

The blog owner is a physicst who likes to take photos. You can find here some different pictures taken by a pysicist's viewpoint. Trying to take more professional photos, this blog will verify a push and motivation to me.