Joheen Chakraborty

Physics PhD student at MIT interested in high-energy astrophysics, black holes, and gravitational wave sources

[Joheen Chakraborty @joheenc]

@SayomGD This is what it means to play from the heart

[SMBC Comics @SMBCComics]

This is one of those jokes you make, then realize people in the field have probably been saying it verbatim for 20 years.

COMIC ◆ https://t.co/Hic22AtO7Z
PATREON ◆ https://t.co/DYYMqy2KN8
STORE ◆ https://t.co/aRRj5Lx651

[Joheen Chakraborty @joheenc]

It's me, I'm astronomers

[AAS Nova @AASNova]

A Black Hole’s Puzzling X-Ray Bursts

A supermassive black hole awakened seven years ago, and it’s now behaving in a way astronomers can’t explain. https://t.co/XOM4k8JFeT

[Will Bredderman @WillBredderman]

Worst of all, gym classes are making them run miles an Uber could cover in less than a minute.

[Peyman Milanfar @docmilanfar]

Years ago when my wife and I we were planning to buy a home, my dad stunned me with a quick mental calculation of loan payments.

I asked him how -he said he'd learned the strange formula for compound interest from his father, who was a merchant born in 19th century Iran

1/4

[Joheen Chakraborty @joheenc]

The price of vibe coding is that nobody can have a new coding problem ever again

[Pedro Domingos @pmddomingos]

RIP Stack Overflow.

[Nirmalya Kajuri @Kaju_Nut]

"Why do we study qubits directed along z-axis mainly?"

🤦‍♂️🤦‍♂️🤦‍♂️

[Sridhar Ramesh @RadishHarmers]

STEM is so cool. Science is amazing. Kids should develop curiosity about how the universe works and proficiency in uncovering its secrets, so that they can most effectively optimize clickthrough rates on banner ads at the bottom of VC-funded website-apps.

[Joheen Chakraborty @joheenc]

@SayomGD I also don't understand LSU going for it there, but that's probably because I don't watch football

[NASA Universe @NASAUniverse]

Our NICER telescope on the @Space_Station is studying mysterious events called quasi-periodic eruptions, or QPEs. These repeating X-ray flares happen near the central black holes in some galaxies. QPEs in a system nicknamed Ansky are the most energetic and longest yet discovered! https://t.co/cedv2CavoD

[Joheen Chakraborty @joheenc]

@Zugzwang_Sor wow, thanks for linking this! It looks very interesting, I have some reading for the break now :)

[Joheen Chakraborty @joheenc]

So where are all the outspiraling double WDs? Maybe they all merge, maybe we’re not detecting them, or something else altogether! For more, including eerily identical optical spectra and further discussion of evolutionary models, check out the paper https://t.co/6GweSzPIAR (6/6)

[Joheen Chakraborty @joheenc]

Belated paper day: https://t.co/6GweSzPIAR

We discovered three ultracompact binaries with accreting white dwarfs (WDs), by their photometric and spectroscopic variability. With orbital periods of 13.2/8.7/7.9 mins, they are the most compact binaries with accretion disks! (1/6)

[Joheen Chakraborty @joheenc]

Finally, there’s emerging tension b/w theory & data. MESA models of ELM+CO WDs predict the initial inspiral/period minimum should be >>faster than the subsequent outspiral. We should blindly detect |Pdot_in/Pdot_out|~4x more outgoing systems at 10 mins. That is… not seen. (5/6)

[Elyas Obbad @ObbadElyas]

🚨 What’s the best way to select data for fine-tuning LLMs effectively?

📢Introducing ZIP-FIT—a compression-based data selection framework that outperforms leading baselines, achieving up to 85% faster convergence in cross-entropy loss, and selects data up to 65% faster.

🧵1/8

[Joheen Chakraborty @joheenc]

@sy5841414 our conversation yesterday was what brought this into my mind, I hope you feel good about enabling a hit viral tweet™️

[Joheen Chakraborty @joheenc]

Apparently Amtrak has not heard of the efficient market hypothesis