Can somebody please explain to me how the S-Matrix of Heisenberg and others helped influence the birth of String Theory. I keep hearing people say that String Theory came as a result of S-Matrix but I don't see the connection. Please keep maths to a minimal. Thanks.
hey can somebody suggest me some good books on string theory ...i am looking forward to join this field and i have no knowledge about this theory ... and some information about some colleges which are good for quantum physics and what's the future in this field of quantum physics... by the way i...
Hi all,
Just curious as to whether it is a good rule of thumb ( though not an actual rule) that out of two effective queries
(i.e., two queries q1, q2 that return the desired result) , the query that is shortest as a string, i.e., has the fewest total words, will run faster? I understand the...
I've gotten interested in this question since the recent loophole free bell test performed at Delft University (group of Ronald Hanson). In this test they use entanglement swapping which I hadn't heard about before.
After some research I even found out that there is such a thing as delayed...
Homework Statement
The fundamental frequency of vibration of a particular string is f. What would the fundamental frequency be if the length of the string were to be halved and the tension in it were to be increased by a factor of 4?
Answer: 4 f
2. The attempt at a solution
We have f = f1...
Homework Statement
So, a string with length L and a mass of M is given tension T. Find the frequencies of the smallest three modes of transverse motion. Then compare with a massless string with the same tension and length, but there are 3 masses of M/3 equally spaced. So this is problem #1...
Did string theory come about as a possible solution to quantum mechanic's "something being in several places at the same time" paradox so to speak? I am not a math-guy or pretend to know anything about physics. I m just curious. I was thinking that what appears as something being in multiple...
Maybe I'm thinking about this incorrectly, but I would assume that the wave loses energy after bouncing back and before hitting the wave moving in the opposite direction. Wouldn't this prevent a perfect null (if the amplitudes were different)?
hey hey :)
So this is the code i came up with
%% part 2
x=[1 2 3 4 5];
% 1 is freshman
% 2 is softmore
% 3 is junior
% 4 is senior
% >4 is super senior
for i=1:5
s=input('number: ');
switch s
case 1
yearNumber='freshman';
case 2...
Homework Statement
I am currently coding a program which reads a file and makes a graph based on the arrangement of the data in the file. The first line of the file stands for the number of vertices and the rest of the lines stand for the edges
something like this:
3
1 2
2 3
3 4
In the first...
I came across the term "Misner string" in this paper: http://arxiv.org/abs/1509.07854
My understanding is that this originated in the study of spacetimes such as Taub-NUT. If I'm understanding correctly, this involves CTCs encircling the string. Misner's original interpretation of the string...
I'm Indian and I've heard stuff that it is difficult to get into a good PhD program in the US/UK for string theory because the competition is more fierce than other fields. Furthermore,the likelihood for getting academic positions is even tougher(added to the fact that I'm from a different...
Hello, I have a problem that seems to have beaten me.
I want to make a cable-driven reduction system between a threaded rod (pinion) and a larger threaded cylinder. Because of string walking, the string between the two has to stay at all times straight, parallel to the ground so that...
Two 2.4-kg blocks are connected by a string draped over the edge of a slippery table, so that one block is on the table and the other is just hanging off the edge. A restraint holds the block on the table in place, and the string is 0.50 m long. After the restraint is removed, what speed does...
Homework Statement
[/B]
Your niece finds her father's watch. The light watch chain has a length of 48 cm, and the mass of the watch is 270 g. Your niece swings the watch in a vertical circle, maintaining the speed of the watch at 2.3 m/s. Find the tension in the chain when it makes an angle of...
On a test our teacher asked about a system composed of (string -> mass -> string -> mass) hanging, that began to oscillate up and down.
We all considered weight (mg) when applying Newton's second law to find the associated differential equation.
When we met our teacher again he said that we...
So my pulley system has 3 masses two of which are connected to a center mass on top of a table. No mass was given for any of the objects but of two masses hanging from the table, the one on the right is 2 times the mass on the left. I hope I haven't confused you but its like a three step diagram...
Do you know where I can order a part that connects string to the ceiling? The part has to be rotate free with very tiny friction. Inside the part may be air filled or vacuum. There has to be no hard wired connection between the ceiling and the part.
I would make one if I know how.
Hope someone...
Is it possible to predict the damping coefficient of a string using a mathematical simulation that included the string's diameter, length, frequency (and therefore tension), material density, and elastic modulus (if not also its Poisson's ratio) as opposed to simply looking at the amplitudes of...
Is it possible to vibrate a string with electricity? I'm guessing an electro-magnet placed close to the string would be able to vibrate it.
If the electro-magnet is used to vibrate the string, I'm guessing the electro-magnet should be pulsed at the fundamental resonate frequency of the string...
In the figure we see two blocks connected by a string and tied to a wall, with θ = 33°. The mass of the lower block is m = 0.9 kg; the mass of the upper block is 4.0 kg. Find the tension in the string that is tied to the wall.
-I have the forces of Block A as Tension, Normal Force, and Gravity...
I have put together an equation whose purpose is:
With a desired 'magnitude of static friction' ( μ_s ), 'fundamental frequency' ( f ), and 'tension' ( T ),
initial conditions such as 'string breakover angle' ( Θ_0 ), 'nut-tuner distance' ( L_{h,0} ), and 'string diameter' ( d ),
and...
Homework Statement
An undisturbed string is struck from below by a hammer of width 2a, as shown in the figure.
Calculate the total energy of the wave motion and show that it is equal to the energy the string has when it is first struck
3 cases:
t=0+ (string just got struck)
t>(a/c) (when...
Homework Statement
A 10.0kg sphere is attached to the incline by a horizontal string. Determine the tension in the string.
Homework Equations
(F⃗ net)x=ΣFx=0
(F⃗ net)y=ΣFy=0
Στ=0
τ = (radial disance)(F)
The Attempt at a Solution
1. I began by determining all the relevant forces associated...
In M Theory, can an elementary open 1d string attach its ends on an M5 brane?
According to M theory, the elementary string are created when an M2 brane is wrapped tightly around a circular dimension. When the open string is created can its end point attach on an M5 brane??
A lot of people quote 10^ 500 as the number of different ways of compactifying the extra dimension in string theory. But I recall somoene saying at a talk that its now much larger than that. What's the current estimate?
Homework Statement
[/B]
This graph shows an infinite string on the x-axis. The middle part is deformed as shown. The string is released at time t=0
- give the analytical solution of the problem, i.e. find for t>0
- sketch the string displacement \xi(x) for a sequence of times t. (I'd like...
Homework Statement
A particle of mass m is whirled on the end of a string of length R. The motion is in vertical plane in Earth's gravitational field . The instantaneous speed is v when the string makes angle Ө with the horizontal. Find the tension T in the string and the tangential...
A unknot is pretty much a circle or a 2-sphere, so is a closed string, maybe a bit more irregular but approximatly the same. Of course more is needed to identify the closed string as an unknot than the shape.
I assume that it is not so, yet I have no reason to deny it. I hope you may give me a...
I have been following along the problem on SO(32) st. in Zwiebach's "A first course in String theory" and my question concerns this problem. I have no problem with the mathematics of SO(32), at least not at the simple level Zwiebach discusses it, rather the "why" behind a particular concept of...
Hi, friendsi! My text of physics, Gettys', shows how the energy, both kynetic and potential, of a small element ##\Delta x## of a string, through which a wave (whose wave function is ##y:\mathbb{R}^2\to\mathbb{R}##, ##(x,t)\mapsto y(x,t)##) runs, is:
##\Delta E=\Big[...
Homework Statement
This is the answer :
For part d) of this question, I don't understand "stretching/extension reduces and velocity increases/height increases" .
Homework Equations
Hooke's Law: F=kx
The Attempt at a Solution
Ok, so if extension is reduce, then force reduces too. Then...
Hello,
Before starting, I would like to apologize for any errors in the use of symbols. This is my first time :sorry:.
I am studying the wonderful book of Barton Zwiebach, "A First Course in StringTheory".
In chapter 02, I am experiencing for the first time with the mathematics of special...
1. Homework Statement
A 30-cm long string, with one end clamped and the other free to move transversely, is vibrating in its second harmonic. The wavelength of the constituent traveling waves is
A -- 10 cm B -- 40 cm C -- 120 cm D -- 30 cm E -- 60 cm
Homework Equations
for second...
1. Homework Statement
Two blocks of masses m1 = 3.7 kg and m2 = 3.3 kg are connected by a string as shown in the figure above. The horizontal surface is frictionless. A 15 N force directed at 18 degrees above the horizontal acts on m2.
Determine the acceleration of the blocks and the tension in...
Strings are said to be one dimensional, due to the math. And I understand that there are problems in the math when they put the strings in 3 or 2 dimensions.
According to string theory, lengths smaller than Planck length have no physical significance.
Could it be that strings are 3...
Hello,
I have the configuration as shown in attached picture. I know how to calculate string tension and measure frequency if the string is not moving. But what happens if the string is moving at a constant speed? Are there still standing waves? Can we still calculate the string tension? What if...
I get that tension in a mass-less string arises because of electrostatic forces which arise because atoms of the string are pulled apart. I also understand that it is equal and opposite in direction at all points because otherwise the string would accelerate infinitely. But what about the last...
By considering the superposition of two waves propagating through a string, one representing the original or incident wave and the other representing the wave reflected at the fixed end, if both ends of the string is fixed then the waves can reflected and travel back and forth. Standing wave can...
A wave pulse on a string moving from left to right towards a free end will reflect and propagates from right to left with the same speed and amplitude as the incident wave, and with the same polarity.
My question is, why the slope and the vertical force must be zero at the free end? If the...
In deriving wave equation or power transmission of wave transmitted by a string, it is usually stated (with some assumptions) that the transverse force on a point of the string is proportional to the slope at that point. An example is given in p.20 of this notes...
Assume String Theory is headed in the right direction, can one understand electron (or any Standard Model particle spin for that matter) spin roughly in terms of some small spinning string? If so, would you consider that a selling point of the theory as it provides an explanation for intrinsic...