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Week_1/Log/Day 1.md

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+#ICTS #may2024
+6 - 5 - 2024
+
+This is my first day at ICTS in bangalore
+Job shadow program
+
+**10:15** 
+Reached and had breakfast
+
+**10:30 to 11:30**
+Downloaded & setup vsc and tested anaconda and linux vm (wget <link>)
+
+**11:30 to 1** 
+attending a lecture on bayesian procedure
+(notes in notebook)
+
+SpEC
+Spectral Einstein code
+https://www.black-holes.org/code/SpEC.html
+
+**1:15 to 2** - Lunch 
+
+**2 to 2:30** 
+working on assignment given by vaishak
+learn arrays in python
+![[WhatsApp Image 2024-05-06 at 16.04.03_5faf9ce0.jpg]]
+
+plot a graph 
+![[Pasted image 20240506150028.png]]
+
+
+**2:30 to 4** 
+Lecture on Linear Algebra 1
+
+Linear vector space
+- closure under addition, associativity of addition
+- associativity of scalar multiplicatiojn
+- distributivity
+
+R is a real vector space of real scalars
+R^n is real vector space of n vector 
+
+Properties of <. , .>
+1) <x, y> > 0 Vx not equal to 0 = positive definite
+2) <x, y> = <y, x> - symmetry
+Operation on vectors in R^n 
+
+ Vector can be measured in different scales
+ 1) Euclidean / 2 - norm 
+ 2) Manhattan / 1 - norm
+ 3) Chebyshev / infinity norm
+ 4) Minkowski / p - norm
+ 5) Energy Norm
+
+![[Pasted image 20240506150418.png]]
+
+Unit sphere: locus of points at unit distance from origin
+
+Functionals
+Let V be a vector space
+Any function that maps V into R: f: V -> R is called a functional
+f is called linear functional if 
+f(x1 + x2) = f(x1) + f(x2) -> additive 
+f(ax) = af(x) = homogenous
+
+Example
+1) ||x|| is a nonlinear functional
+
+Cauchy Schwarz inequality (CS)
+
+Span of a set of vectors
+orthogonal vectors
+linearly independent vectors in 2 dimensions - infinite number possible
+
+**4:00** 
+more  messing around with numpy 
+
+make the y scale logarithmic
+
+Damped sinusoid equations 
+![[Pasted image 20240507190413.png]]
+Made a jupyter notebook which contains all python activities from day 1
+
+
+**Reflection**
+
+- ICTS is a nice and open place, I could go around and be wherever I wanted, which was good. Gave me a sense of freedom I guess
+- I am thinking that the outcomes of this job shadow program could be 
+	- writeup on what other researchers do in the astrophysics and relativity group
+	- github repository with the python notebooks of each day's python work 
+
+

Week_1/Log/Day 2.md

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+#ICTS #may2024 
+8 - 5 - 2024
+
+**10:30 to 11:15**
+
+In the bus learned about normal distributions and probability contours. Probability contours are ellipses that show the distribution of a two-dimensional probability density function.
+
+A chi-squared test, or Khi2 test, is a statistical hypothesis test that compares the observed distribution of data to an expected distribution.
+
+**11:30**
+Supercomputer at ICTS 
+
+"sonic"
+https://it.icts.res.in/
+14 nodes
+HPC - high performance computing
+	has to communicate data through the nodes
+HTC - high throughput computing
+	does not need to communicate data through different nodes
+
+AMD Epyc 7413 
+2 socket per node
+24 cores per socket = 48 cores per node, 96 threads in total
+256 gb ram on signing nodes
+384 gb on the computing nodes
+running centos
+
+Recently acquired 2x
+Nvidia A40 gpu with 48gb vram
+
+data analysis
+	uses gpu and the HTCs
+
+
+**12:00 to 1:00**
+
+Group meeting/discussion on interesting paper found on Arxiv
+[Members of Astrophysics Relativity Group at ICTS](https://www.icts.res.in/research/astrorel/members) 
+
+- [Alorika Kar] talked about "Quick recipes for gravitational-wave selection effects
+	- https://arxiv.org/abs/2404.16930
+	- https://arxiv.org/pdf/2404.16930
+
+- [Ankur Barsode] talked about "Lens Stochastic Diffraction: A signature of compact structures in gravitational wave data"
+	- https://arxiv.org/pdf/2404.17405
+		- if you have single lens - 2 images
+		- you can have multiple lenses but the fainter images are all going to overlap on each other and you are going to get a stochastic signal and it will come from the same location as the main image. 
+		- multiple images from multiple lenses all overlapping with each other
+		- Questions
+			- How many lenses
+				- probably 10 - 15 is what he is using 
+			- There should be a threshold 
+				- didnt go that much into the details
+			- why is it important
+				- you can use non detection to constrain blackholes??
+- [Prasad R] talked about "Dynamical ejecta from binary neutron star mergers: Impact of residual eccentricity and equation of state implementation"
+	- https://arxiv.org/pdf/2404.18674
+		- ejected mass is whatever is remaining after neutron stars merge 
+		- ejecta is ejected more if neutron star is spinning more
+		- Concerned about
+			- accuracy of simulation
+			- internal reactions
+				- keeping everything fixed and see how it reacts
+- [Prasad R] also talked about "Black hole-neutron star mergers with massive neutron stars in numerical relativity"
+	- https://arxiv.org/pdf/2404.18714
+- [Krishnendu N V] talked about "Numerical parameterization of stationary axisymmetric black holes in a theory agnostic framework"
+	- https://arxiv.org/pdf/2404.17055
+- [Vaishak P] "NOTES ON THE PRACTICAL APPLICATION OF NESTED SAMPLING: MULTINEST, (NON)CONVERGENCE, AND RECTIFICATION"
+	- https://arxiv.org/pdf/2404.16928
+- [Koustav Narayan Maity] "Neutron stars and the cosmological constant problem"
+	- https://arxiv.org/pdf/2404.19012
+
+Mainly the PHD fellows were the ones discussing and asking questions and answering each other's doubts on each of the research papers. 
+
+After lunch, **2:00**
+
+worked on python notebook, extracting original parameters from noise of a damped sinusoid wave. 
+
+refer "Day 2_assgt.ipynb for more info"
+
+**EOS**
+- should consider installing and learning docker, so i can use vsc and develop inside a linux environment 
+- vaishak likes using powerful computer resources to find solutions to problems that need answering, not like google and microsoft who use supercomputers to give users better ads
+- 

Week_1/Log/Day 3.md

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+#ICTS #may2024 
+9 - 5 - 2024
+
+mainly python stuff
+dynesty
+
+Enter some stuff about LIGO detectors
+
+
+
+physics of it 
+	gravitational waves
+	LIGO detectors
+		they are what observe the time series data
+	binary black hole mergers
+	waveform generation
+	numerical relativity**
+
+computational challenges in brief and then exapnd on it in more detail
+
+data analysis and parameter 
+	minimization - maximum likelihood estimation - chisquared 
+	bayesian inference 
+	gravitational wave data analysis
+		matched filter (understanding of it)
+
+Research ICTS
+	operational structure
+	usual week
+	group activities
+	computational resources
+	people in ASTROPHYSICAL RELATIVITY group
+
+
+
+Covariance matrix
+	Read up on vector spaces because it is matrices and all
+	fourier transform
+
+noise sensitivity curve 

Week_1/Log/Day 3_ athome.md

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+#ICTS #may2024 
+13 - 5 - 2024
+- Setup [WSL](https://learn.microsoft.com/en-us/windows/wsl/)
+- Ubuntu is running well
+	- Installed software
+		- anaconda
+		- git
+		- VScode extensions to ssh from wsl to windows machine
+		- Gui apps (firefox, x11, nautilus)
+	- Can access files from both within linux and shows up as a separate location in windows
+	- ![[Pasted image 20240514121747.png]]
+	- ![[Pasted image 20240514124825.png]]
+	- Looked through [Parameter estimation](https://gitlab.com/vaishakp/parameter-estimation)
+	- Read through some of the links

Week_1/Week1.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>ICTS Job Shadow Index</title>
+  <style>
+    body {
+      font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+      color: #b31d0f;
+      background-color: #fafafa;
+      margin: 0;
+      padding: 0;
+    }
+    .container {
+      max-width: 800px;
+      margin: 0 auto;
+      padding: 20px;
+    }
+    h1, h2 {
+      color: #b31d0f;
+    }
+    p {
+      margin-bottom: 20px;
+    }
+    button {
+        color: #fafafa;
+        background-color: #b31d0f;
+    }
+
+  </style>
+</head>
+<body>
+  <div class="container">
+    <header>
+      <h1>Week 1 Activities at ICTS </h1>
+      <nav>
+        <button onclick="window.location.href='../index.html'">Index</button>
+      </nav>
+    </header>
+    <main>
+      <section id="Week 1">
+        <h2>Week 1</h2>
+        <p>Python notebooks and Markdown files of activities of Week 1</p>
+      </section>
+        <!-- Add your portfolio items here -->
+      </section>
+    </main>
+    <footer>
+      <!-- Add footer content if needed -->
+    </footer>
+  </div>
+</body>
+</html>

Week_2/Log/Day 4.md

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+#ICTS #may2024 
+15 - 5 - 2024
+**10:40** 
+- Trying out [Parameter estimation](https://gitlab.com/vaishakp/parameter-estimation) in WSL
+
+**11:00 to 12:00**
+- working on the final document on overleaf
+
+**12:00 to 1:00**
+
+Group meeting/discussion on interesting paper found on Arxiv
+[Members of Astrophysics Relativity Group at ICTS](https://www.icts.res.in/research/astrorel/members) 
+
+- https://arxiv.org/abs/2405.02197
+	- dont seem to address any numerical sources, only physical sources
+		- nrv sources 
+	- listed possible reasons and does not go into that much of detail 
+	- there are no figures in the document by choice 
+	- not about physics but more about physical sources 
+- https://arxiv.org/abs/2405.05318
+	- it is a convoluted way to write
+		- whether they really did it from the masses
+	- only the sky location and time and brightness of the flares and the brightness should also be related to the mass
+	- brightness related to mass and gas
+	- if the black hole is more massive then there is more gas
+	- systematic more flare activity if the black hole is massive
+	- AGN flares
+- https://arxiv.org/abs/2405.05884
+- https://arxiv.org/abs/2405.05094
+- https://arxiv.org/abs/2405.04690
+	- publically available data set from LISA 
+	- catalog of possible sources 
+	- dont know parameters
+	- analysing real LISA data and can be used for simulations
+	- used for software development 
+	- markov chain monte carlo implemented on gpu
+		- fold the data which you get from LISA
+	- have they compared cpu vs gpu
+		- NERYN
+	- used nvidia a100 and 12 cpu
+	- dont think there is any machine learning like training over here
+	- https://lisa-ldc.lal.in2p3.fr/challenge2a
+- https://arxiv.org/abs/2405.03841
+	- formation channel of neutron stars (factcheck)
+	- redefining many events
+	- surprised that they can claim which one formed first
+	- how do they decide what came first
+		- prior and then posterior estimation
+	- one object is a neutron star and another is black hole do we use information to construct priors using ()
+- https://arxiv.org/abs/2405.03607
+	- when spins are gravitationally oriented, the radiation is not symmetric. 
+	- this is also motivated by fact that equal mass binaries form largest kicks
+		- however asymmetric mass binaries form largest kicks
+		- equal mass binaries largest kicks is wrong so it is either a typo or something is not understood fully 
+

Week_2/Log/Day 5.md

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+#ICTS #may2024 
+16 - 5 - 2024
+
+**10:30 to 11:30**
+
+Learned linux terminal commands and how to append a directory to PYTHONPATH
+![[Pasted image 20240516132244.png]]
+![[Pasted image 20240516132412.png]]
+^appended directories to $PYTHONPATH
+
+![[Pasted image 20240516132459.png]]
+creating new environment for yumcee package testing 
+	"-n" is the tag to name the env
+	"-c" is the tag to specify the repository of packages, in this case it is [conda-forge](https://conda-forge.org/)
+
+"env" is a command to display current environment in linux
+
+
+**11:30 to 1:00** 
+
+Learned the basics of Linear algebra 
+![[WhatsApp Image 2024-05-16 at 13.31.20_b56691a7.jpg]]
+![[WhatsApp Image 2024-05-16 at 13.31.21_23955639.jpg]]
+![[WhatsApp Image 2024-05-16 at 13.31.23_11818b52.jpg|330]]
+Identity matrix is a diagonal matrix with all its diagonal elements equal to 1 , and zeroes everywhere else. [Newcastle University](https://www.ncl.ac.uk/webtemplate/ask-assets/external/maths-resources/core-mathematics/pure-maths/matrices/matrix-arithmetic.html#:~:text=An%20identity%20matrix%2C%20sometimes%20called,1%20%2C%20and%20zeroes%20everywhere%20else.)
+
+
+a(x) = x; where a (scalar) multiplying x (vector)
+
+Rotation and Translation of matrix []
+
+Look through this book when bored so I can learn more about Linear Algebra. Teaches it in a physics point of view. [Linear Algebra Klaus Janich.pdf](file:///C:%5CUsers%5Cdrpro%5CDownloads%5CLinear%20Algebra%20Klaus%20Janich.pdf)
+
+- also figured out how to resize picture in obsidian, have to add a " | " and a number after image, eg. !["[sample.jpg|330]"]
+
+
+Working on showing Autocorrelation code and understanding covariance matrix
+
+
+