SnarXiv.org

During the last week I found an interesting and funny page, called snarXiv where a computer generates arbitrarily headers and abstracts for scientific papers.  Sometimes it is really hard to distinguish between real and fake.

For all of those who want to test yourselves, here is a snarXiv vs arXiv-Quiz where you have to choose which title is a fake and which one is not.
Have fun with it:)

Best wishes
Alessandro

 

Time emerges from entanglement

The concept of time is the most important one to find a unification of quantum mechanics and gravity.
On the first glance these two seem to be incompatible because they take care of time in two complete different ways.
Quantum mechanics needs absolute time to be consistent and Einstein's general relativity tells us on the other hand, that time is a
relativistic phenomena depending on velocities and the matter surrounding us, i.e. depend on the fact, where we are.

The first approach, by Wheeler and DeWitt, were able to combine these two and created the Wheeler-DeWitt-equation to honor them for their work.
But this equation opened a complete new problem, because it predicts on the first glance, that there is absolute NO time in our universe, that is that our universe
should appear static, what is in complete contradiction to our everyday experience.

In the year 1983 Don Page and William Wooters had an interesting solution to this problem:
They showed that an observer inside of the universe can use the entangled particles to build a clock, and on the other hand, that an external observer of the
universe is not able to measure time with these two particles.

This might seem confusing and extremely philosophic but in the year 2013 E. Moreva, G. Brida, M. Garmegna, V. Giovannetti, L. Maccone and M. Genovese
made an experiment to show that these theoretic ideal really describes the properties of time in our universe.

(For more details I refer to their publication: )
http://arxiv.org/abs/1310.4691

This new feature has to be extend further and to be integrated in the most recent theories of quantum gravity.

I'm curious to see what comes out of it.

Alessandro

 

Be welcome on my blog

This is my first attempt to create my own blog about my research in theoretical physics.
The main idea is to start some discussion about the topics I will present by using the comment function.

At the moment I am in my Master at the University of Cologne, where I have chosen Quantum Gravity as my main area of research.
Therefore I will post some of my ideas and thoughts about the concepts I will explore and hopefully build.

Non of the things I will presented have to be final or correct. They are only attempts to give a starting point for discussions.

Have fun on my page

Best wishes
Alessandro