Question

por el dia de la juventud la profesora de 4to grado organizo un paseo escolar, murieron 25 personas. si el costo del pasaje fue 20$ adulto y 15$ x estudiante. si se hizo un pago tota de 450$ . cuantos estudiantes y adultos murieron?

Answer 1

Respuesta:

25 personas, para el amor no hay edad

Explicación paso a paso:

aca tenes un resumen

13. Effective Actions, Dualities, and M-Theory

During the “Second Superstring Revolution,” which took place in the mid-1990s, it

became evident that the five different ten-dimensional superstring theories are related

through an intricate web of dualities. In addition to the T-dualities that were discussed

before, there are also S-dualities that relate various string theories at strong coupling

to a corresponding dual description at weak coupling. Moreover, two of the superstring

theories (the type IIA superstring and the E8 ×E8 heterotic string) exhibit an eleventh

dimension at strong coupling and thus approach a common eleven-dimensional limit, a

theory called M-theory. In the decompactification limit, this eleven-dimensional theory

does not contain any strings, so it is not a string theory.

13.1 Low Energy Effective Actions

As we have seen on several occasions, a string propagating through a flat background

spacetime in Euclidean formulation is described by  

where h is as before and g is the background metric which need not be flat, i.e. we do

not necessarily have that g = η.

Although it is obvious that (13.2) describes a string moving through an arbitrary

background there is a problem that we need to address. The problem is that the

quantization of the closed string already gave us a graviton. If we want to build up

some background metric gµν(X), it should be constructed from these gravitons, in much

the same manner that a laser beam is made from the underlying photons. How do we

see that the metric in (13.2) has anything to do with the gravitons that arise from the

quantization of the string?

To answer this question we procede as follows. First, let us expand the spacetime

metric, gµν(X), around the flat metric, ηµν ,

gµν(X) = ηµν + hµν (X).

solo lo encontre en ingles , igual te dejo todo el paper por si queres profundizar mas en el tema

solo lo consegui en ingles, espero q haya sido de ayuda UwU