The h Bar

@Secret Okay, I can't argue with that

This one is more headache though, as I don't know nearly 100% of the people

user116211

Know all of them; but not acquainted with two of them.

user116211

2:14 PM

Loong, Ortho, Rubisco, Phil, Penta are common in chat.

I knew Loong, he often stopped by in the inactive periods of h bar and ocassioanlly in maths

I don't recall asking him questions though or vise versa, only typical chatting

Hi everyone

@SwapnilDas Hi Dr. Nick!

John Rennie

→ 1 message moved to Trash

@Jim what happened

2:17 PM

@0celo7 not important

@Jim May I know, on what problems of Cosmology are you working on?

My only conversation with Loong is that merck bought sigma

@SwapnilDas Currently, I am not doing any active research (much to my chagrin).

@Jim oh, are you teaching then?

@SwapnilDas Yes, I'm performing more of a teaching role with the University of Toronto right now. I expect to get back into research at some time in the undetermined future

2:23 PM

Damn, Dr. Nick is a physician in Simpsons 😛

@Jim Cool! I'm very uncertain with my future. Sometime I wanna be a Quantum Physicist, sometimes a Cosmologist and the next time a Statistical Mechanic lol.

Slereah

well you're pretty consistent in wanting degrees that won't give you a job

user116211

There is no Quantum Physicist.

What exactly drove you towards Cosmology? @Jim

Quantum field statistical cosmology is a real thing

@Secret Seriously?

@Slereah Well why not?

2:28 PM

Quck googlign foudn couple of arxivs athored by some guy called BL Hu who is doing research on such fields. I will see if I can find somethign mroe recent

Otherwise, cosmology and quantum field theory intersect in the field of particle cosmology, where particle physics are tied to astrophysical phenomenon and things like nucleospynthesis and the phase transition of the universe

@Secret arxiv.org/abs/gr-qc/9403061 Ic

Also black hole physics is where all 3 of them intersect too, if you are onto these kind of stuff

@Secret Yeah, I knew! But unfortunately, I know really less about black holes to my annoyance

Having said that, it is a common misconception that lumping things together is the same as making n choices at once, but in practice, because resources and time are finite, lumping many fields together actually divert the time on each of them. Thus it is still one choice

So let your passion and your life tell you which is best for you

@Secret Yeah, life is beautiful and predictive from this perspective. Though, keeping an interest from young age can surely help brightening my future 😛

@Secret Are you a physics grad?

2:36 PM

yes I am a chemistry honours and physics undergraduate who recently graduated

and I am applying for chemistry PhD

@Secret best of luck!

user128101

I am interested in nearly all natural sciences but since very young I already knew my passion is in chemistry. Year 1 then narrow this down to metal complexes

Having said that, quantum mechanics remain fiercely competitive in passion with chemsitry

@Secret you must be focussing on its applications in chem?

The ONLY reason why quantum unable to win over chemistry is "database dryness", the need to crunch through a bunch of numbers bores me, bu in chemistry, being able to touch the chemical I made counteract that by gettign oneself dirty with hands on experience

No not really, I am actually more interested in the fundemental aspects of quantum, such as its relationship with time, and entanglement. In quanutm computing aspects, I am also more focused on entanglement

2:41 PM

@SwapnilDas I am extremely interested in how the universe works but not very interested in the specific things that populate it

@user104372 I have no idea what this is supposed to be

I do have interest in quantum chemistry, developed since my honours such as the topology and geometry of potential energy surfaces and how they control reaction dynamics

@Jim Very same.

Are you interested in the large scale or the small scale laws of the cosmos?

Mostly large.

user128101

@Jim, your new Jimius Caesar avatar, of course

2:43 PM

But Statistical Mechanics is really beautiful as a subject.

user128101

In 5 hours, of course

Oh god, Tab's charge is 1%, bye!

In that case I think you might be interested in researches related to how the universe evolve as a whole, e.g. things from the inflation period to the present day, the many phase transitions it been thorugh and why

There are both theoretical and experimental aspects to this:

The theoretical including the modelling of dark energy and dark matter distributions and how that affect the universe. The more particle side of things include topics related to nucleosynthesis, the antimatter problem and the symmetry breaking that lead to the 4 fundemental forces to separate

@user104372 you seem to have lots of faith I will be elected. I was thinking the probability of that is on the low side. Perhaps I'll have to write an acceptance speech then

The experimental include various types of spectroscopy and astronomy of the objects in the universe such as type 1a supernova that give an idea on how fast the universe is expanding, measures on the CMB which tell the large scale structures. Personally I am most excited about what neutrino and gravitational astronomy can offer as they can penetrate a lot of matter back to regions moments after the big bang never seen before

user128101

2:51 PM

@Jim, you already started to think/talk/act like a Mod: "... If a proposed correction is wrong, there's no benefit in having it remain. If you don't like it, nobody is forcing you to utilise the SE network. "

and of course, particle physics searches, which give us ideas on the building blocks that are involve in those phase transitions

Jacobadtr

In an ionic arrangement of unitary charges, 2+ and 2-, does the pauli repulsion distinguish between the sign of the charges?

@user104372 talking like a mod is just being diplomatic, nice, and rational. I prefer to do that independent of moderating

2

Jacobadtr

i.e If each charge is on the corner of a square, with opposite charges on opposing corners, does the pauli repulsion act between all charges or just those of opposite sign?

Rational

Jacobadtr

2:59 PM

Or rather, if the pauli repulsion is rooted in the exclusion principle, it would act on those with the same sign I think.

The charges of opposite sign aren't identical

Just thinking out loud, I think i've answered my question

Jiminion

@Jim I am the real Jim. Jim is the imposter.

who the hell is ^

user128101

@Jim, there will be 650 votes cast, tgp gets roughly 230, the you and ACM will scramble for 185 each

@Jim I think there's something wrong with the coffee machine at work

how do I fix it?

3:18 PM

@0celo7 have you tried turning it off and back on

@Jiminion Jim isn't the impostor, Jim is

Emilio Pisanty

Any Mathematica'ers around?

John Rennie

@EmilioPisanty if you're asking can I run your script the answer is yes. If you're asking can I help write a Mathematica script the answer is almost certainly no.

Q: Pattern matching to a function evaluation inside an Association

Not sure if I count, but maybe...

Emilio Pisanty

@JohnRennie does this look buggy to you?

1

I find the following behaviour deeply counter-intuitive: <|1 -> 123.456 |> /. {x_?NumericQ -> Round[x]} (* <|1 -> Round[123.456]|> *) That is, if I make a rule-based replacement of things that sit as values inside an Association object, and I require even a minimal amount of processing on the...

<|1 -> Round[123.456]|>

as an output

with an unevaluated Round

Since users here are really strong at math, lemme beg for help.

John Rennie

3:23 PM

@EmilioPisanty no idea, sorry. That's way outside my knowledge of Mathematica.

@EmilioPisanty it does look weird, but I don't know if it quite qualifies as a bug

I'm not sure what official specification would be applicable here

Emilio Pisanty

@DavidZ "don't return stuff unevaluated"

?

it's bizarre

If you put <|1 -> Round[123.456]|> in a cell and run it, it takes out the 456

but if you do

<|1 -> 123.456 |> /. {x_?NumericQ -> Round[x]}
Evaluate[%]

the Evaluate doesn't do anything

@EmilioPisanty Pretty sure that's not the official specification for how Mathematica should behave ;-)

Why isn't a blog for PSE? :(

@SwapnilDas People generally don't seem interested in writing for it, and the few that are have their own blogs

3:27 PM

@Jim let me try

@DavidZ Sir do you mind if I ask you a question on your blog?

You mean ask me a question about my blog? Sure, that's fine

Why do you think research is exhausting?

Because I'm always tired ;-)

That's not about my blog though

IT WORKED

dmckee

3:30 PM

@SwapnilDas Details. There are some many of them and you have to be very sure you've covered them all.

@Jim genius <3

dmckee

Of course, it's worth it for the the feeling when you finally get it right.

@dmckee still waiting for that feeling, lol

@dmckee referring research right?

What does the command /. alone do in Mathematica?

3:32 PM

@dmckee Do you think my QM prof wants my 11 pages of messy algebra I did for the homework? I typed up the results but I left out most of the linear algebra/simplification

@dmckee @DavidZ As you both have done research, lemme ask, was Einstein a hard worker or a gifted one? Just an opinion poll.

I don't know Einstein. I have no idea.

That is why I ask. Any guesses?

Whoa

Why was that removed?

@SwapnilDas I find it hard to imagine that he would have done the work he did without being both.

@0celo7 as my way of telling you not to post stuff like that.

3:35 PM

@SwapnilDas Einstein had like 300 papers

dmckee

@0celo7 He wants to see enough steps to feel confident that you did the work. That doesn't mean he wants to see every single line. But I don't know exactly how much he wants to see.