Ginestra Bianconi

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345 appearances 1 recordings 1 series first heard Jul 2026 last heard 13 Jul

Ginestra Bianconi’s voice in public audio — every appearance, attributed to the second.

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Theories of Everything with Curt Jaimungal · Ginestra Bianconi: The Physicist Who (Unexpectedly) Derived Gravity From Entropy · 13 Jul 2026 podcast

And the differences are mainly two.

One is that the metric is dressed by this G-field.

So it's like the true metric is not exactly what interacts with matter, but what interacts with matter is a dress metric with this G-field.

And you have a dark energy term, which is a dynamical cosmological constant that depends on this G-field.

So an important test about prediction is to see if this can shed some light into the Hubble tension or other property.

Yeah, so practically, you know, this geometric relative entropy can be written in terms of this G field.

And then there will be, in terms of the G field, it appears to have three terms.

One that you can identify with something closer to Einstein-Hilbert action.

It's a sort of dress Ricci's color because it's formed by the Ricci tensor contracts with this stress matrix and the Riemann tensor contracts with this stress matrix.

And another term that is the matter action that, you know, is this thing that comes from the geometric induced by the matter field and curvature, it is contracted with this stress metric.

So it's just stress metric.

Instead of the metric, you have the metric contracted with this G field.

So it's like the matter fills this stress metric.

Well, I think one advantage of the gravity from entropy approach is that it leads to Einstein equation in the low energy limit.

This to my understanding is not always the case for many quantum gravity approach, or at least might be quite difficult to obtain.

And respect to other modified gravity,

that there is huge literature on modified gravity,

But the gravity from entropy, it has the advantage that there is a motivation.

There is a physical motivation for choosing this action, right?

It's not just, you know, the next term in the Fourier series or things like that.

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