22 research outputs found

### D-brane width

Loop quantum gravity predicts that there are non-zero minimal area, and
non-zero minimal volume in (3+1) dimensions. Given this, one can easily guess
that one will have a non-zero minimal 9-volume in (9+1) dimensions. Therefore,
in this paper, we argue that not only D9-brane but also Dp-brane for p less
than 9 has a 9-volume. This idea is new, as the present view states that such a
Dp-brane has p-volume but no 9 volume. To demonstrate this, first, we equate
D8-brane action with D9-brane action and show that 9th direction which is
perpendicular to D8-brane has non-zero width. We repeat this step for different
ps; we equate Dp-brane action with Dp-1 brane action. By this iteration and
induction we conclude that Dp-brane has non-zero widths for each of (9-p)
directions perpendicular to the Dp-brane, and therefore, non-zero volume. When
antisymmetric tensor and field strength are zero, this width is calculated to
be 2 pi sqrt(alpha') for all (9-p) directions. For non-vanishing antisymmetric
tensor and field strength, the width receives small corrections. In this paper,
we only calculate up to the first order correction.Comment: 4 pages, no figures, argument based on loop quantum gravity adde

### Black Hole Entropy Prediction without Immirzi Parameter

In our earlier paper "Corrections to the Bekenstein-Hawking entropy and the
Hawking radiation spectrum", arXiv:0910.2755, we provided two concrete
numerical evidences for the new area spectrum based on the Einstein-Kaufman
pseudo tensor as opposed to the Ashtekar variables: namely, the reproduction of
the Bekenstein-Hawking entropy without fixing Immirzi parameter and the
reproduction of the Hawking radiation spectrum. In this article, we provide
another concrete, numerical evidence for this new area spectrum; there was a
constant in our earlier article, which was inversely proportional to the
density of state, and which we could not fix a priori. Nevertheless, in our
earlier article, we obtained this constant to be around 172~173 by fitting it
to the Planck radiation spectrum. In this article, we calculate this value
using another method. We obtain 172.87...which implies consistency.Comment: 5 page

### Inflation and the late time acceleration from Hossenfelder-Verlinde gravity

We show that Hossenfelder's covariant formulation of Verlinde's emergent
gravity predicts inflation and the late-time acceleration at the same time,
without assuming a separate field such as inflaton, whose sole purpose is
producing inflation. In particular, for the current deceleration parameter
$q=-0.95$ to $-0.55$, we obtained $\lambda^2$, the mass of the imposter field,
from $1.85\times 10^4$ to $2.26\times 10^4$. We also note that the value of
$\lambda$ around $q=-0.93$ coincides with the inverse of fine structure
constant.Comment: Previous numerical mistakes fixed. Simulations for four different
values of q. Connection with the fine structure constant suggeste