Are the standards of studying/teaching methods same across different branches of theoretical physics like particle, astronomy and cosmology? For example we observe a lot of tours, events and conferences in institutes of astronomy and astrophysics, whereas particle and cosmologists are mostly...
Nowadays much of the community of astronomy and astrophysics is focused on simulations and data analysis. Thus people, who do not have access to grids and data, must resort to analytical analysis. What are the challenging areas of astronomy and astrophysics that rely on analytical workout rather...
Monocular vision gives only the quality of depth and it needs lots of variation in texture, shading and a strong perspective(not available ideally in photo, possible in painting) to construct a 3d scene. In contrast, binocular vision gives a precise estimate of depth. It only needs a minimum of...
I am a researcher and wish to learn astrophysics(research in dark matter). I have never studied astrophysics or astronomy. I am in search for a book that can guide me
(1)How do astronomers predict masses of stars, galaxies and planets, their positions and relative velocities?
Take a look into the derivation of transition probability in the case of the constant potential. The derivation shows that the time of the measurement is actually the time during which the interaction potential was switched on. It does not include the time after the potential was switched off...
As i studied Fermi golden rule. It involves transition probability of an initial state transiting to a final state in case of constant potential. As i understand the product of time of transition and the frequency of transition should be very much larger than one in order that the dirac delta...
In Superkamiokande, How does one differentiate between muon being produced by neutrinos coming from upward than the muon being produced by the neutrinos coming from downward.
Is it okay to classify the angular degree of freedom of a point on a circle as a gauge degree
(i). One can add 2Pi to angle without changing the position of point.
(ii). U(1) symmetry exp (i theta)
I have studied a measurement 2(+0.9 error(written in superscript) and -0.1 error(written in subscript)) in a book that gives statistical value of difefrent parameters . What does this measurement implies. As a normal statistical error is written as (2 +-0.9).
Dear friends, i was working on a hadronic decays. It appears that one has to calculate form factors. These form factors involve some very complex numerical integration. I would like to know if there are some packages available for calculating these form factors.
I have studied that the hadronic matrix element of pion decay
(Pi+->mu+ anti muon neutrino) is given as
The vector current does not seem to contribute, because it cannot connect a state of unnatural parity to hadronic vacuum. Only the axial and...
I guess we can express it as
W-|u>=Vud |d>+Vus |s>+Vub |b>
W-|c>=Vcd |d>+Vcs |s>+Vcb |b>
W-|t>=Vtd |d>+Vts |s>+Vtb |b>
and |d> , |s>, |b> are orthogonal states (not necessary due to GIM mechanism)
<u|W-(adj) W-|u>=1, <c,t|W-(adj) W-|u>=0
=> V as a unitary matrix
This is a known fact that CKM matrix, a matrix that is used to connect the weak interaction eigenstates to mass eigenstates is unitary. I have studied that this is due to the conservation of probability. i.e. an up type quark will decay into exactly three type of d quarks, nothing more.
I believe (3) may hold in the end. i.e. A correct theory of Quantum Gravity may prevent a wormhole to become traversable in the first place. If there is no travel possible through wormhole, no space like intervals appear in any frame of reference thus effectively excluding the possibility of...
You are correct, only the configuration consisting of two wormholes having uniform relative motion with each other and sufficiently close, can form a time machine. This example clearly shows how much problematic is the idea of wormholes with relationship to causality.
So the configuration outlined above does form a time machine. i.e. Whenever
two wormholes of equal length are in uniform relative motion (close to speed
of light)and are sufficiently close to each other, such a configuration will form
a closed time loop. A signal starting...
Consider a wormhole. Suppose its two mouths have no relative motion with
each other. Therefore no time difference exists across its ends. It provides a
mean to travel faster than "light in normal space". Imagine this wormhole to be
at rest in frame "S"(say). If there is another frame...
Consider a wormhole. Suppose its two mouths have no relative motion with each other.
Therefore no time difference exists across its ends. It provides a mean to travel faster
than "light in normal space". Imagine this wormhole to be at rest in frame "S"
(say). If there is another...