trash

3:41 AM

+1 for recommending counseling. Some other answers seem to border on vigilante psychoanalysis — user30031 1 min ago

#11889 user30031 (101 rep) | A: My fiancée is addicted to a "free-to-play" (pay-to-win) game (score: 83) | posted 4 days ago by Jhal (779 rep)

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A J

4:19 AM

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IPS Comment Bot

9:07 AM

@Tinkeringbell I wasn't planning to respond to your comment, but I think I need to, just to be clear: In no way did I intentionally write a duplicate question, just so I could post an answer. My question is authentic, based on a real experience from a few nights ago. You (and someone else, too) continue your campaign of belittling new users in this community, all the while wondering why there seems to be no progress in community-building. — D.Hutchinson 41 secs ago

#12090 D.Hutchinson (2174 rep) | Q: How to politely and effectively communicate with someone who's deaf? (score: 0) | posted 8 hours ago by D.Hutchinson (2174 rep) | edited 7 hours ago by D.Hutchinson (2174 rep)

Matched regex(es) ["possible-aic"]

IPS Comment Bot

10:51 AM

TL;DR: Call her on her bullshit, and don't put up with it. She'll respect you more if you respect yourself and take a stand. Don't put up with a bad situation, it will only get worse. Hopefully, this was a one-off event. — Mark Micallef 1 min ago

#11982 Mark Micallef (101 rep) | Q: I dreamed you did so and so. Why did you do that? - How to react? (score: 55) | posted 3 days ago by Edgar (2089 rep) | edited 19 hours ago by henning (3642 rep)

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Tinkeringbell

@IPSCommentBot The two above that are answers in comments... can be flagged as well

A J

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Kenshin

11:26 AM

Hello peoples

I have a question on QM if one can be so kind as to assist me

IPS Comment Bot

+1 I was about to suggest this answer - if it's so difficult then you should be doing (or could contrive to do) "training hikes" between now and then, make sure they come along and both you and more importantly, she, can assess her fitness. She may surprise you. — colmde 1 min ago

#11920 colmde (121 rep) | A: How to tell an overweight person that the hike will be too hard? (score: 5) | posted 4 days ago by Beanluc (287 rep)

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Kenshin

Akash, to do well in science, one must get used to waiting long times for answers

Like Higgs had to wait how many years to confirm whether his boson was real

You don't know of doctor higgs

Peter Higgs proposed a particle called the higgs Boson in 1964, and he wasn't told he was right until 2012

He subsequently won the nobel prize a year later for phsyics

commonly referred to as that indeed

that is a theory of gravity my friend

it doesn't explain magnets unfortunately

Ok

Why don't we see hippopotamuses hiding in the bushes?

Because they're really good at it

@JohnRennie will you please assist with my QM question

John Rennie

@Kenshin what's the question?

Kenshin

@JohnRennie, I understand that in QM, a quantum state's observables won't be time dependent unless the system is a superposition of energy eigenstates, is this understanding of mine correct?

John Rennie

An energy eigenstate is by definition time independent, so the observables cannot be time dependent if the system is in an energy eigenstate.

Kenshin

11:38 AM

@JohnRennie, I thought an energy eigenstate is an eigenvalue of the Hamiltonian

which just then happens to be time independent

John Rennie

@Kenshin correct. Eigenstates of the Hamiltonian are time independent.

Kenshin

ok, so then

Einstein says that time is what clocks measure, and one could say that clocks are systems that are not time-dependent

Thus @JohnRennie, coudl we say that the uncertainty in energy of some quantum states is what allows time to exist

John Rennie

If we have some system that is not in an energy eigenstate then we can use the energy eigenstates as a basis to describe the system i.e. our wavefunction looks like: $$ \Psi = \sum_i a_i\psi_i $$ where $\psi$ are the energy eigenstates.

Kenshin

where uncertainty in energy = states that are in superpositions of energy (that is, not energy eigenstates)

@JohnRennie, speaking more philosophically tho, if all states were pure energy eiegnestates, time wouldn't be measurable and in some sense could be argued to not exist. It is the existence of energy uncertain states that gives us our clocks for which we can then measure time correct?

John Rennie

So when we say a time dependent system is a superposition of energy eigenstates that's true, but what we're really saying is we can write any random state as a superposition of energy eigenstates.

Kenshin

11:42 AM

yes I understand that

John Rennie

@Kenshin You are mixing up time and the flow of time

Kenshin

how so

John Rennie

49

Q: What is time, does it flow, and if so what defines its direction?

This is an attempt to gather together the various questions about time that have been asked on this site and provide a single set of hopefully authoritative answers. Specifically we attempt to address issues such as: What do physicists mean by time? How does time flow? Why is there an arrow of ...

Kenshin

I'm just thinking of time as a parameter

in the same way as space

John Rennie

I went to great lengths to explain the difference here. Have a read through and see if that helps.

Kenshin

11:43 AM

I think that if no rulers existed, and all states were independent of spatial coordinates, one could argue space doesn't exist

@JohnRennie, I will read it, but I ask you to coonsider my thought that time can only be detected because our universe contains wavefunctions that have uncertain energies

If our universe didnt have any states with uncertain energy, if all energy in the universe was well defined

then time wouldn't be measurable

as we would have no clocks

So it is interesting to ponder that uncertainty in energy gives rise to time

John Rennie

@Kenshin the flow of time can only be detected because our universe contains wavefunctions that have uncertain energies

Kenshin

@JohnRennie yes indeed

isn't that interesting?

Because much events are represented in terms of time and space

so both of these quantities are important to humans

John Rennie

@Kenshin Not really, no. In time independent systems the flow of time doesn't have any obvious meaning.

Kenshin

@JohnRennie, of course, because it is time independent

John Rennie

@Kenshin pretty much all of modern physics has been the discovery that what seems obvious to humans doesn't have much relevance.

Kenshin

11:47 AM

lol

It is fascinating to me, that it is UNCERTAINTY that gives rise to the appearance of time's flow

I haven't really read this anywhere

but it is logically deducable from QM

@JohnRennie, I've now read your link on time/flow of time, and I can say I am aware of all this already. I don't believe my concept applies to the subjective flow of time, but even applies to time as being simply a parameter too.

My concept even applies in the block universe where time doesn't flow at all

John Rennie

3 mins ago, by Kenshin

It is fascinating to me, that it is UNCERTAINTY that gives rise to the appearance of time's flow

Sounds to me like you're talking abput the subjective experience of time flowing

Kenshin

nope

I can reprhase

It is UNCERTAINTY that gives rise to systems changing over a time parameter

My concept is this, suppose there is a parameter of the universe, for which all states are constant over all variations in such a parameter. Since the universe is all encompassing by definition, then we could easily say that such a paramter is useless and could be deemed to not exist.

So if all quantum states in the universe were time independent, then we could easily just do away with the concept of time all together

now the reason states are not time independent, is thanks to some states having uncertain energy levels

So we can therefore thank the existence of uncertainty in energy levels for the existence of time itself.

--------To summarise, if there were no uncertainty in energy levels, then time would be a meaningless parameter

@JohnRennie my logical is undeniable correct?

John Rennie

I think you have things the wrong way round

Time exists, and since it exists we can define rates of change. A rate of change of zero is a special case.

Kenshin

the existence of time gives rise to uncertain energy levels

John Rennie

You're saying that states with a zero rate of change are more fundamental than time, which is the wrong way round.

Kenshin

11:57 AM

well @JohnRennie, I agree your interpretation works too. But I think it may be like the many interpretations of QM. While you prefer your interpretation, it gives the same predictions as mine

So both interpretations may be kept in mind as it may provide guides for generating new physics

John Rennie

I think you've stopped talking physics now. Feel free to continue on the religion SE.

2

Kenshin

is Many worlds interpretation of QM religion lol?

Richard Feynman in one of his lectures said to consider all possible interpretations of physics, as each may help guide future development

John Rennie

Feynman was notorious for talking bollocks at times

Kenshin

We currently think time is a given, from which we can deduce "energy", and this works well in classical mechanics. In QM however, energy coudl well take the seat, and time may be a consequence of such uncertainty

I think our reliance of time being more fundemental than energy is just a consequence of humans working with classical physics before discovering QM

John Rennie

12:20 PM

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Tinkeringbell

12:33 PM

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Abcd

@Secret I had a quick question (3 minutes) if you allow...

Secret

I am currently quite free as I have took my bath. What's the question?

Abcd

@Secret Bromination of N-Methyl anniline, what's the major product according to you?

I feel that it should be the trisubstituted product where Br is present at all three positions o,p and o

Because I have this reaction from Clayden's book:

And because $\ce{-NHCH3}$ is very similar to $\ce{-NH2}$ I felt that it should be at all three positions in its case too

Steric Hindrance prevents ortho completely?

Secret

1:07 PM

I suspect purely electronically, the reaction will be the same as the aniline case, except much faster (since you have a methyl on the amine which has a lot of electron density to donate to the pi system)

As for sterics, I don't remember if a methyl group is bulky enough

Abcd

1:35 PM

okay, thanks!

@Secret Can we move the star spam discussion to trash?

Secret

It's your room, you can move it

Abcd

There's no option to do that...

Secret

you are the room owner, click the arrow in the "room" button and find "move message"

Abcd

← 1 message moved from Room for Abcd and Secret

@Secret Oh, its only for single message?

Can't I move multiple messages to trash

Secret

you need to click the start message, hodl shift, and click the end message

Abcd

1:43 PM

← 10 messages moved from Room for Abcd and Secret

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Tinkeringbell

3:54 PM

!!/help

IPS Comment Bot

Note: If <botname> is the only argument, it can be ommitted and the command will be seen by all bots. If <botname> is "*" all bots will repond as though they've been mentioned.

!!/on <botname> - Turns on the bot (if it isn't already on)
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Tinkeringbell

← 2 messages moved from The Awkward Silence

diobuc eulb

5:01 PM

@heather can you please show us this? physics.stackexchange.com/questions/137432/…

because you’re awesome

and 10k

congrats btw

John Rennie

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Secret

boys will be boys, that's why they are... ugh
Johnrenie please trash this, cause this is a lagged message tgar belong to whatever you just trahed

John Rennie

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Rainbacon

5:43 PM

interpersonal.stackexchange.com/questions/12129/…

Extroverted Main Man

-2

Q: How do you deal with people after winning the lottery

How do I know who really are my friends just because I happened to win a large lottery jackpot?

responsibility

IPS Comment Bot

6:58 PM

I think your answer could profit greatly from deleting the last part. It's very opportunistic to think like that. For some people there are things worth breaking relationships over, especially if they are not firm anyhow. There are also people that like being confronted and argued with quite intensely. I got one of my best friends by passionately disagreeing with him for an hour about his most favourite thing. The saving face, being kind, be careful not to anger anyone approach is not always ideal for everyone. — Raditz_35 1 min ago

#12132 Raditz_35 (192 rep) | A: When/how is it appropriate to ask someone to back up a claim they make in conversation? (score: -2) | posted 16 minutes ago by Kino (1 rep)

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Tinkeringbell

7:12 PM

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Abcd

7:33 PM

Which has greater inductive effect: $\ce{N^+-CH2}$ or $\ce{CN-CH2}$ and why?

← 1 message moved from JEE/ High School Chemistry Problems

IPS Comment Bot

8:01 PM

@Clay07g I disagree, I think just saying "No" without an explanation would be considered rude. There is a large difference between lecturing your friends and telling them "no you should do this yourself". I think it would actually be more rude to just say "no" to a close friend. — Childishforlife 36 secs ago

#12045 Childishforlife (226 rep) | A: How can I politely refuse to help classmates with their work? (score: 41) | posted 34 hours ago by Ahsan9981 (401 rep) | edited 33 hours ago by Ahsan9981 (401 rep)

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IPS Comment Bot

8:23 PM

Instead of, "You're right, [y] is very interesting because [z], but we were talking about [x] so can we come back to [y] later?" what about phrasing it, "You're right, [y] is very interesting because [z], after we're done talking about [x] can we come back to [y]?"? I think replacing "..but we were..." makes the comment slightly less confrontational, given that the sister is hypersensitive. A good answer, though. +1 — Don Branson 23 secs ago

#12125 Don Branson (101 rep) | A: How can I convey to someone that the way she communicates is awkward without upsetting her? (score: 9) | posted 5 hours ago by Tay W (111 rep)

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Mr. Xcoder

8:38 PM

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IPS Comment Bot

9:25 PM

"Experience or references, preferably experience": that was the impression I got from reading 3 well-upvoted meta answers on this topic: interpersonal.meta.stackexchange.com/a/1611/381 and interpersonal.meta.stackexchange.com/a/12/381 and interpersonal.meta.stackexchange.com/a/19/381 which note that it is often not possible to base IPS answers on references, and experiences are just as good a substitute. So you are saying that references are better than experience when available? -- okay, I shall revise my understanding on that point @Catija. — English Student 1 min ago

#12005 English Student (7532 rep) | A: How can I respond to well-meaning comments at the gym? (score: 4) | posted 2 days ago by English Student (7532 rep) | edited 1 hours ago by English Student (7532 rep)

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Note 2: I see you have made your point very clear in your answer to that question, although you also agreed with Hamlet's "experience is the way to go" answer: I shall try to quote references whenever available or else specify that the answer is based on my experience @Catija. — English Student 22 secs ago

#12005 English Student (7532 rep) | A: How can I respond to well-meaning comments at the gym? (score: 4) | posted 2 days ago by English Student (7532 rep) | edited 1 hours ago by English Student (7532 rep)

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Mithrandir

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IPS Comment Bot

10:58 PM

Agreed. Her delusions are not OPs responsibility. If anything, it sounds like she is the one who is insecure and liable to infidelity. He should confront her, and perhaps move on to someone more stable. — Mark Micallef 1 min ago

#11986 Mark Micallef (101 rep) | A: I dreamed you did so and so. Why did you do that? - How to react? (score: 20) | posted 3 days ago by FreeElk (563 rep)

Matched regex(es) ["chatty"]

IPS Comment Bot

11:28 PM

Unless, of course, you're ready and willing to deal with the blowback. Some stuff is clearly bullshit, and some people need to be publicly called on it...but those who need it most might hate you for it. — cHao 15 secs ago

#12133 cHao (1007 rep) | A: How might it be appropriate to ask someone to back up a claim they make in conversation? (score: -1) | posted 4 hours ago by Richard U (6118 rep)

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Mithrandir

11:42 PM

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IPS Comment Bot

11:58 PM

Please don't repost your answer just because you disagree with the locking/edit. — Ash 45 secs ago

#12144 Ash (472 rep) | A: How can I let my girlfriend know that her insults are hurting my feelings and ask her to stop? (score: -1) | posted 15 minutes ago by Mark Micallef (95 rep)

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