- #36
sol2
- 910
- 2
D1 to D5 Brane
http://www.sukidog.com/jpierre/strings/stringbh.gif
How the heck did you get to D5? You had to be able to determine the gravtion scalable feature in terms of these branes? From weak to strong. Certain particle situations then become realistic under such considerations.
From a one dimension recognition weak field gravitational measure would have satifsied the particle nature at it's minimum energy consideration? This would be distinctive?
D5 considerations would have asked us to consider four of space and one of time?
http://www.sukidog.com/jpierre/strings/stringbh.gif
How the heck did you get to D5? You had to be able to determine the gravtion scalable feature in terms of these branes? From weak to strong. Certain particle situations then become realistic under such considerations.
From a one dimension recognition weak field gravitational measure would have satifsied the particle nature at it's minimum energy consideration? This would be distinctive?
One of the most dramatic recent results in string theory is the derivation of the Bekenstein-Hawking entropy formula for black holes obtained by counting the microscopic string states which form a black hole. Bekenstein noted that black holes obey an "area law", dM = K dA, where 'A' is the area of the event horizon and 'K' is a constant of proportionality. Since the total mass 'M' of a black hole is just its rest energy, Bekenstein realized that this is similar to the thermodynamic law for entropy, dE = T dS. Hawking later performed a semiclassical calculation to show that the temperature of a black hole is given by T = 4 k [where k is a constant called the "surface gravity"]. Therefore the entropy of a black hole should be written as S = A/4. Physicists Andrew Strominger and Cumrin Vafa, showed that this exact entropy formula can be derived microscopically (including the factor of 1/4) by counting the degeneracy of quantum states of configurations of strings and D-branes which correspond to black holes in string theory. This is compelling evidence that D-branes can provide a short distance weak coupling description of certain black holes! For example, the class of black holes studied by Strominger and Vafa are described by 5-branes, 1-branes and open strings traveling down the 1-brane all wrapped on a 5-dimensional torus, which gives an effective one dimensional object -- a black hole.
http://www.sukidog.com/jpierre/strings/bholes.htm
D5 considerations would have asked us to consider four of space and one of time?