Natalí de Santi

Natalí de Santi

I am a physicist interested in cosmology, data science, machine learning and programming

Posts by Tags

2012/2022

10 years from my undergraduation in Physics

20 minute read

Published:

In this post I bring a flashback from my undergrad in Physics, because this year (2022) I am completing 10 years from the beginning of this wonderful journey! What is written here is only my personal experience and does not reflect what happens with all the students. First, because I am old (a lot has changed at USP - the university where I did my undergrad - and in the proper major of Physics by there) - and (of course) because it is different, between the different majors.

Casimir effect

Casimir effect

15 minute read

Published:

In this post you will see what is the bizarre Casimir Effect. I will start telling you about quantum fluctuations, give you some qualitative definition of it and, then, two quantitative descriptions. As I warned you in the previous post (Harmonic Oscillator), the Physics/Mathematics behind of this effect are the quantum harmonic oscillators!

Correspondence Principle

Harmonic Oscillator

14 minute read

Published:

This post is about the basic unit of the Physics, the harmonic oscillator. I start telling you why it is so important in Physics and about the classical version of it. Then, I pass to its quantum version. This “transition” is a good way to see the Correspondence Principle and here I explain why!

Einstein's equations

Schwarzschild Black Holes

7 minute read

Published:

This post is dedicated to the Schwarzschild solution of Einstein’s equations. Here I will follow a simple way to deduce it and show why this solution arises to what we call as the basic kind of black hole: the Schwarzschild Black Holes.

Graph Neural Networks

Graph Neural Networks

17 minute read

Published:

Have you ever heard about graphs? What about graph neural networks (GNNs)? If you have never paid attention, let’s try to remind you that, structures like the image below are, actually, graphs. And they are filling all the internet.

Graphs

Graph Neural Networks

17 minute read

Published:

Have you ever heard about graphs? What about graph neural networks (GNNs)? If you have never paid attention, let’s try to remind you that, structures like the image below are, actually, graphs. And they are filling all the internet.

Klein-Gordon field

Casimir effect

15 minute read

Published:

In this post you will see what is the bizarre Casimir Effect. I will start telling you about quantum fluctuations, give you some qualitative definition of it and, then, two quantitative descriptions. As I warned you in the previous post (Harmonic Oscillator), the Physics/Mathematics behind of this effect are the quantum harmonic oscillators!

Machine Learning

Pytorch

8 minute read

Published:

Hello there! If you just came to this blog and you would like to learn something about PyTorch I believe you can find something to start playing around. In this post we will see how to write a simple code to solve a simple regression problem. This means we will do predictions for a quantity $y$, given values for their predictor (the input) $x$ for a noised: $y = a x + b$.

Numerov's method

Harmonic Oscillator

14 minute read

Published:

This post is about the basic unit of the Physics, the harmonic oscillator. I start telling you why it is so important in Physics and about the classical version of it. Then, I pass to its quantum version. This “transition” is a good way to see the Correspondence Principle and here I explain why!

PyTorch

Pytorch

8 minute read

Published:

Hello there! If you just came to this blog and you would like to learn something about PyTorch I believe you can find something to start playing around. In this post we will see how to write a simple code to solve a simple regression problem. This means we will do predictions for a quantity $y$, given values for their predictor (the input) $x$ for a noised: $y = a x + b$.

PyTorch Geometric

Graph Neural Networks

17 minute read

Published:

Have you ever heard about graphs? What about graph neural networks (GNNs)? If you have never paid attention, let’s try to remind you that, structures like the image below are, actually, graphs. And they are filling all the internet.

Regression

Pytorch

8 minute read

Published:

Hello there! If you just came to this blog and you would like to learn something about PyTorch I believe you can find something to start playing around. In this post we will see how to write a simple code to solve a simple regression problem. This means we will do predictions for a quantity $y$, given values for their predictor (the input) $x$ for a noised: $y = a x + b$.

Schwarzschild

Schwarzschild Black Holes

7 minute read

Published:

This post is dedicated to the Schwarzschild solution of Einstein’s equations. Here I will follow a simple way to deduce it and show why this solution arises to what we call as the basic kind of black hole: the Schwarzschild Black Holes.

Undergrad in Physics

10 years from my undergraduation in Physics

20 minute read

Published:

In this post I bring a flashback from my undergrad in Physics, because this year (2022) I am completing 10 years from the beginning of this wonderful journey! What is written here is only my personal experience and does not reflect what happens with all the students. First, because I am old (a lot has changed at USP - the university where I did my undergrad - and in the proper major of Physics by there) - and (of course) because it is different, between the different majors.

barium titanate

A bit of BaTi0.9Zr0.1O3

5 minute read

Published:

In this post you will see a bit about the Barium Titanate (BaTiO3) with the inclusion of zirconium, i.e., the BaTi0.9Zr0.1O3 material. I start with the motivation behind this work and its objectives. Then, I describe the methodology to produce the powders and the pellets, and finalize with the electric characterization of the materials produced.

black holes

Schwarzschild Black Holes

7 minute read

Published:

This post is dedicated to the Schwarzschild solution of Einstein’s equations. Here I will follow a simple way to deduce it and show why this solution arises to what we call as the basic kind of black hole: the Schwarzschild Black Holes.

flashback

10 years from my undergraduation in Physics

20 minute read

Published:

In this post I bring a flashback from my undergrad in Physics, because this year (2022) I am completing 10 years from the beginning of this wonderful journey! What is written here is only my personal experience and does not reflect what happens with all the students. First, because I am old (a lot has changed at USP - the university where I did my undergrad - and in the proper major of Physics by there) - and (of course) because it is different, between the different majors.

harmonic oscillator

Harmonic Oscillator

14 minute read

Published:

This post is about the basic unit of the Physics, the harmonic oscillator. I start telling you why it is so important in Physics and about the classical version of it. Then, I pass to its quantum version. This “transition” is a good way to see the Correspondence Principle and here I explain why!

liquid nitrogen

Superconductivity

7 minute read

Published:

In this post I will summarize what superconductivity is, tell you about some historic aspects, pass through a little of theory (without touching the “mathematics” behind it – because this work was done when I was a teenager) and show to you all the stages of the production of the cuprate YBaCuO pellets and the development of a support, to see the magnetic levitation using them.

magnetic levitation

Superconductivity

7 minute read

Published:

In this post I will summarize what superconductivity is, tell you about some historic aspects, pass through a little of theory (without touching the “mathematics” behind it – because this work was done when I was a teenager) and show to you all the stages of the production of the cuprate YBaCuO pellets and the development of a support, to see the magnetic levitation using them.

material characterization

A bit of BaTi0.9Zr0.1O3

5 minute read

Published:

In this post you will see a bit about the Barium Titanate (BaTiO3) with the inclusion of zirconium, i.e., the BaTi0.9Zr0.1O3 material. I start with the motivation behind this work and its objectives. Then, I describe the methodology to produce the powders and the pellets, and finalize with the electric characterization of the materials produced.

materials production

A bit of BaTi0.9Zr0.1O3

5 minute read

Published:

In this post you will see a bit about the Barium Titanate (BaTiO3) with the inclusion of zirconium, i.e., the BaTi0.9Zr0.1O3 material. I start with the motivation behind this work and its objectives. Then, I describe the methodology to produce the powders and the pellets, and finalize with the electric characterization of the materials produced.

numerical methods

Harmonic Oscillator

14 minute read

Published:

This post is about the basic unit of the Physics, the harmonic oscillator. I start telling you why it is so important in Physics and about the classical version of it. Then, I pass to its quantum version. This “transition” is a good way to see the Correspondence Principle and here I explain why!

quantum vacuum

Casimir effect

15 minute read

Published:

In this post you will see what is the bizarre Casimir Effect. I will start telling you about quantum fluctuations, give you some qualitative definition of it and, then, two quantitative descriptions. As I warned you in the previous post (Harmonic Oscillator), the Physics/Mathematics behind of this effect are the quantum harmonic oscillators!

regularization

Casimir effect

15 minute read

Published:

In this post you will see what is the bizarre Casimir Effect. I will start telling you about quantum fluctuations, give you some qualitative definition of it and, then, two quantitative descriptions. As I warned you in the previous post (Harmonic Oscillator), the Physics/Mathematics behind of this effect are the quantum harmonic oscillators!

superconductivity

Superconductivity

7 minute read

Published:

In this post I will summarize what superconductivity is, tell you about some historic aspects, pass through a little of theory (without touching the “mathematics” behind it – because this work was done when I was a teenager) and show to you all the stages of the production of the cuprate YBaCuO pellets and the development of a support, to see the magnetic levitation using them.