pnjun

u/pnjun



r/AskPhysics•

So, hear me out. I'm a dumb experimentalist that remembers a tiny bit of QFT from my master's.

IIRC, in the SM Lagrangian the fields don't have any explicit mass term due to symmetry. The masses come instead from the interaction with the Higgs, and it is only when re-writing the Lagrangian with respect to the non symmetric VeV that the mass terms pop out.

This would mean that from the point of view of the 'unbroken' Lagrangian, the lepton fields all have mass zero, and therefore their excitations travel at the speed of light. Since the mass term is a consequence of the interaction with the Higgs field, how wrong is it for me think that the slower than c speed of normal particles is just t

11


r/berlin•

After reading yesterday's post on "shoplifting at REWE", i started wondering: What rights do shop security personnel actually have?

Can they really detain/arrest you? Do they have the right to ask for your ID? Can you just refuse to talk to them and walk away?

I'm not suggesting that someone goes and steals to then do it, but I would like to know what are the legal basis for a non-police officer to detain someone.

I ask this because in my own country (Italy), security personnel has basically no more right to detain you than a random person. Even if you set off the shoplifting alarm, they cannot really detain you.

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r/dcsworld•

I have recently gotten into PVP BFM (dogfigthing arena servers). As expected, i suck at it. I am perfectly aware that the overwhelmingly largest factor in my poor performance is lack of ability, but I have been wondering if using a sub-par hotas (I have a X52 pro) is handicapping me even more.

Would switching to something like a gladiator NXT make learning BFM easier? Or is the increased precision not that relevant in BFM?

EDIT: I play in VR with a reverb G2

Cheers!

Ps: is there a place where I can find someone to do BFM exercises with?

917

r/italy•

Ciao a tutti!

Sono un ricercatore all'universitá, mi sono laureato in fisica nel 2016, ho fatto un dottorato e adesso ho un contratto come postdoc. Abito in germania.

Mi occupo principalmente di ultrafast molecular dynamics, ovvero di studiare come si muovono le molecole durante le reazioni chimiche su tempi molto corti (10^-15s). La ricerca che facciamo si occupa principalmente di studiare i cambiamenti che avvengono alle nucleobasi nel DNA dopo l'esposizione alla luce UV.

Questo tipo di ricerca richiede l'ultilizzo di pulsi ultracorti di raggi X, che ad oggi si possono ottenere solo utilizzando un (x-ray) Free Electron Laser. É un

8896



r/Bogleheads•

I see many people here suggesting to go 100% stocks for young people with long time horizons (such as me), in order to exploit the higher returns.

I would like to put this in the context of the CAPM and the efficient frontier. Considering this picture:

https://www.richardcyoung.com/wp-content/uploads/2016/01/efficient-frontier.gif

The most rational choice would seem be to take the efficient portfolio (the point on the curve sitting on the tangent passing through the risk-free asset^(1) and the curve itself), and then use leverage to get to the desired returns.

Using the data from the plot (the data might b

2026

r/Finanzen•

Hi everyone!

I'm a expat living in Germany that is now starting to invest in ETFs. I would like to make the best use possible of the 801EUR freistellungauftrag to reduce the taxes on my investments.

  • Can I sell off 801EUR worth of assets each year and claim the entirety of that as capital gains, get them tax free thanks to the freistellungauftrag, and then reinvest them?
  • Should I invest in a distributing fund in order to get ~800EUR of dividends payout p.a.?
  • Should I do something else that i have not yet thought of?

What is the recommended strategy?

06