They didn't stay long in Greifswald, and the day after visiting the Spiral 7-X laboratory, Lu Zhou and Professor Klitzing returned to Berlin.

It's been almost a month since he came to Germany, and although Lu Zhou has gained a lot during this time, there are still a lot of things waiting for him to complete on the Princeton side, and it's almost time to return.

After booking his plane ticket for the weekend, Lu Zhou stopped by to visit the University of Bonn, and the president of the Max Planck Society, Straman, personally drove him to Berlin Tegel International Airport.

When he got off the bus, the gray-haired old man shook Lu Zhou's hand and said with a smile, "Thank you for your speech to Berlin, we sincerely look forward to your next visit, and sincerely wish you to climb higher heights on your academic road." ”

"It will definitely be," Lu Zhou smiled kindly, holding President Straman's hand, and continued in a humorous tone, "Even if it is for the magnificent scenery along the way, I will continue on this road." ”

After saying goodbye to President Straman, Lu Zhou dragged his suitcase through the departure hall and boarded the plane all the way.

After a ten-hour flight, it finally landed at New York's JFK International Airport.

This time I came back without informing anyone in advance, and Lu Zhou had a rare experience of the slow little train.

All the way to the familiar town of Princeton, he was greeted by his students.

To celebrate his Holf Medal, a group of young people threw a party in front of Lu Zhou's hut at Hardy's suggestion.

However, the food at this party was not Hadi's self-proclaimed authentic Brazilian barbecue, but one of the delicacies of Huaguo's roadside stalls - kebabs.

After going abroad for so long, it is the first time that Lu Zhou has experienced the feeling of masturbating abroad.

The only regret is that there is no beer in the fridge, only fruity champagne, which is still not authentic.

Sitting on the lawn and skewering, Lu Zhou couldn't help but think of the three friends of 201.

After graduation, the trajectory of life has not intersected, and there is basically no contact with each other, and I don't know how they are doing now.

At this moment, Hardy, who had a hippie smile, walked over with a bottle of champagne.

"Professor, may I interview you?"

Lu Zhou said casually: "If it's a normal problem." ”

"Rest assured, it must be a normal problem." Clearing his throat, Hardy spoke, "Excuse me, what is it like to be honored as a mathematician in chemistry?" ”

Lu Zhou thought for a while and said, "Probably...... It's an experience you'll never experience in your life. ”

"Oh, Professor, it's so hurtful for you to say that, I'm one of your chief disciples anyway," Hardy said with a devastated expression on his face, "Can't you have more confidence in me?" ”

Looking at Hadi, who was very shocked on the surface, but actually didn't take it seriously at all, Lu Zhou was really a little heartbroken.

It's not that I feel heartache for this stupid child, but for myself.

At that time, which advantage did I like about this guy, so I sent an offer to this guy?

This question still haunts him today......

In the second half of the party, Senior Brother Luo, who had just talked about his new girlfriend, was finally late.

It's just that this time he didn't bring his girlfriend over, and instead brought good news.

After months of hard work, with the help of Wei Wen, he finally completed his graduation thesis.

The paper, "A Study on the Even-Coherent State of a Finite Vihilbert Space Q-Distortion Harmonic Oscillator", was finally accepted by the journal PHYS-TODAY and will be published within six months.

This journal is a comprehensive journal, although the impact factor is not high, only 4.3, but for a doctoral student, especially a Ph.D. in the field of theoretical physics, this score is quite good.

MOREOVER, IMPACT FACTOR IS NOT THE ONLY MEASURE OF A JOURNAL'S ACADEMIC VALUE, AND HIS BOSS, WITTEN, OCCASIONALLY "FLOODS" PHYS-TODAY.

After this paper is published, if nothing else, he will be able to successfully obtain his doctorate early next year.

"Thank you so much, you are simply my savior!" When they met at the party, Luo Wenxuan found Lu Zhou and hugged his shoulders with both hands excitedly, "I must treat you to a drink another day!" ”

"You don't need to thank me, it's Wei Wen who helped you," Lu Zhou took a half step back and said with a smile, "Of course, if you must invite me to a drink, I won't object." ”

"Actually, I didn't help much," Wei Wen coughed lightly, as if he was not used to being praised by others like this, and explained solemnly, "At most, I am only responsible for some computing work, but my name is on the paper, is it really appropriate?" ”

"No, no, no, 'it's just a work of calculation', I don't agree with this sentence," Senior Brother Luo shook his head and said, "The root of mathematical physics is to study the mathematical solutions to physical problems, and you have made up for my shortcomings in this regard." Without your help, maybe this paper would have to wait until the end of the year to be completed. ”

Seeing Senior Brother Luo so frankly admit his shortcomings in mathematics, Lu Zhou sighed and couldn't help but complain: "Old Tang will be heartbroken when he hears you say this, are you really from applied mathematics?" ”

How the hell did this guy get an offer from Princeton?

And it's also an offer from a big bull like Witten.

Hearing Lu Zhou's words, Senior Brother Luo touched the back of his head embarrassedly and laughed cheekily.

"It's okay, Old Tang is mentally prepared, he has never trained me before."

Lu Zhou: "......"

……

The next morning, Lu Zhou, who returned to the Institute for Advanced Study in Princeton, did not immediately begin his own research, but approached Professor Edward Witten to inquire about something.

The designer of the stellar, Lyman Spitzer, had worked at the Institute for Advanced Study in Princeton for a short time, and it was at Princeton University that the first concept of the stellar simulator was born.

According to common sense, where he once worked, there should be some clues left.

"Congratulations, the Hoffmann Medal is a great honor," Edward Witten said with a smile as he looked at Lu Zhou who appeared at the door, "How did you feel about the trip to Germany?" Did you see that old guy from Faltins? ”

"Yes, yes, but I always felt that he didn't like me very much." Lu Zhou said helplessly.

Edward Witten smiled, "Please don't mind, that old man is like this to everyone, even Deligne, who has always had a good relationship with him, often can't stand him." But I'm relieved to hear you say that...... It seems that his body should be pretty good, at least he still has the strength to hurt people. ”

"I don't mind," Lu Zhou shrugged, paused for a moment, and continued, "Actually, this trip to Germany, I didn't just stay in Berlin, I also went to Greifswald. ”

"Greifswald?" Hearing the name of this place, Witten's eyebrows suddenly raised with interest, and he immediately guessed where Lu Zhou's destination was, "You went to the Spiral Stone 7-X Laboratory?" ”

"Yes," Lu Zhou nodded, "Professor Klitzing took me on a tour of the Spiral Stone 7-X stellarator there, and not only that, I was very lucky to see the test site. ”

"You're really lucky that I've been to Europe five times in the past two years, two of them in Germany. However, every time I passed, I missed the Spiral Stone 7-X experiment perfectly, especially in '16. Speaking of this, Professor Witten had a regretful look on his face.

Unable to help his regrets, Lu Zhou coughed lightly and said the purpose of his visit to him.

"There's one thing I'd like to ask you about the stellarator."

Witten said with a pleasant face: "What's the matter?" ”

Lu Zhou: "The Manuscript ...... on Lyman Spitzer"