celtics

As he watched the Boston Celtics play from the stands of TD Garden, one noise kept catching Adel Djellouli’s ear.

“This squeaking sound when players are sliding on the floor is omnipresent,” he said. “It’s always there, right?”

Squeaky shoes are part of the symphony of a basketball game, when rubber soles rasp against the hardwood floors as players jab step, cut and pivot and defenders move their feet to stay in front of their assignment.

Returning home from the game, Djellouli wondered how that sound was produced. And as a materials scientist at Harvard University, he had a way to find out.

Djellouli and colleagues slid a sneaker against a smooth glass plate over and over. They recorded the squeaks with a microphone and filmed the whole thing with a high-speed camera to see what was happening under the shoe.

In a study published Wednesday in the journal Nature, they described what they found. As the shoe works hard to keep its grip, tiny sections of the sole change shape as they momentarily lose then regain contact with the floor thousands of times per second — at a frequency that matches the pitch of the loud squeak we hear.

“That squeaking is basically your shoe rippling, or creating wrinkles that travel super fast. They repeat at a high frequency, and this is why you get that squeaky noise,” Djellouli said.

The grip patterns on the soles may also play a role. When researchers slid blocks of flat, featureless rubber against the glass, they saw a series of chaotic, disorganized ripples but didn’t hear squeaks.

The ridge-like designs on the bottom of your shoes may organize the bursts to produce a clear, high-pitched sound.

Other researchers have studied these kinds of bursts before, but this sneaker study examines friction happening at much faster speeds. And for the first time, it links the speedy pulses with the squeaking sound they produce.

These insights don’t just serve to satisfy the curiosity of a basketball fan. They could also help answer important practical questions. “Friction is one of the oldest and most intricate problems in physics,” wrote physicist Bart Weber in an editorial accompanying the new research. Yet, despite its practical importance, he wrote, “it is difficult to predict and control.”

Understanding friction better could help scientists better understand how the Earth’s tectonic plates slide and grind during earthquakes, for example, or to save energy by reducing friction and wear.

It could also help eliminate moments off the court when squeaky shoes can be a little awkward or embarrassing, such as in a quiet office hallway.

This research doesn’t offer a fix, though the internet has plenty of advice that may be risky, including rubbing soap or a dryer sheet on the soles. But some of the insights from the study could help to design squeak-free shoes in the future.

For example, one additional experiment found that changing the thickness of the rubber could make the squeak sound lower or higher in pitch. In the future, could we fine-tune our shoes to squeak in a pitch so high we can’t even hear it?

“We can now start designing for it,” said Weber, who is with the Advanced Research Center for Nanolithography and the University of Amsterdam, in an interview. “We can start making interfaces that either do it if we want to hear this sound, or don’t do it if we don’t want to hear it.”

Ramakrishnan writes for the Associated Press.

All of the current Lakers realized that playing against the Boston Celtics on national television really was more than just one of 82 games on the schedule.

It was crystallized even more because iconic former Lakers coach Pat Riley sat courtside after a celebration for the unveiling of his statue on the Star Plaza outside Crypto.com Arena. He was the first Lakers coach to beat the hated Celtics for an NBA championship after eight failed attempts.

So, yes, on this Sunday afternoon, this game meant more if only because it was another game in the long rivalry, a game the Lakers lost, 111-89.

Luka Doncic had 25 points for the Lakers but he was just nine for 22 from the field. LeBron James had 20 points but was just nine for 21 from the field.

It was the second time this season the Lakers scored in the 80s, and that also was a loss.

For a team that entered the game shooting a league-best 50% from the field, it was not a good sign for the Lakers’ offense when their shooting slipped to 36.8% in the second quarter. They shot 39.1% for the game and 30% (nine for 30) from three-point range.

“We had some really good looks,” James said. “I think they had a good game plan defensively, forcing us to take some shots … I mean listen, sometimes you got to make shots. And they made timely shots and we didn’t. We didn’t give ourselves a good chance on the offensive end. I think defensively, we held serve as long as we could. But offensively, we didn’t give ourselves a good chance.”

It was obvious the Lakers felt the intensity of the rivalry when Austin Reaves and Marcus Smart received technical fouls in the second quarter and coach JJ Redick got one in the third.

They were unhappy with the officiating that didn’t go their way against an aggressive Celtics defense.

Perhaps, it was posed to Doncic, the Lakers lost some focus on offense because of the complaints that led to the T’s.

“Maybe. …You’re surprised it wasn’t me, huh?” he said. “Then you know it’s bad.”

Doncic laughed.

But what was of real concern for the Lakers was trying to deal with the Celtics and their three-point shooters.

The Celtics (37-19) entered the game tossing up 42.4 threes per game, the third-highest output in the NBA, and making 15.4 of them, also the third-highest.

On cue, the Celtics shot 14 for 36 from three-point range.

The Lakers (34-22) fell behind by 18 points with 4:46 left in the fourth quarter after Jaylen Brown was fouled while scoring. He made the free throw and then followed that with a three-pointer to put the Lakers in a 21-point hole.

Brown finished with 32 points, eight rebounds and seven assists.

But the real problem for the Lakers was not being able to slow down Payton Pritchard. He had 30 points off the bench, making 10 of 14 shots and six of nine three-pointers.

His three-pointer gave the Celtics a 22-point lead and forced Redick to call a timeout with 3:22 left. Redick pulled his starters, knowing it was over.

“You talk about the personnel and how good Jaylen Brown has been and how good Payton Pritchard has been,” Redick said. “Really where this team kills you is when they can get you in the blender and take catch-and-shoot threes. They can shoot 51 of them and they’re going to make 20. They’re that good. Trying to limit that is the biggest thing when you play these guys. And you have to be willing to live with contested off-the-dribble jumpers. Pritchard made a lot of them tonight. He played a great game.”

James said he watched some of the Riley ceremony that took place at halftime.

James played for the Miami Heat for four years under the watchful eye of Riley. The Heat went to four NBA Finals and won two championships.

Riley left an indelible impression on James.

“I got out there for a little bit, sat on the bench during halftime before our meeting,” James said. “Listen, he’s one of the all-time greats to ever have been a part of this league. Not only player — coach, executive, front office, everything. Obviously what he did here for the Lakers organization in the ‘80s goes without saying and rightfully so, him having a statue outside his building. Obviously I spent four years with him. I have the utmost respect for him, for his family and everything. So, it’s pretty cool.”

NBA star Jaylen Brown had a public spat with the Beverly Hills Police Department Saturday night after police shut down a brand event he was hosting.

Brown, who signed a $285-million contract with the Celtics in 2023, was in Los Angeles for the National Basketball Assn.’s All-Star festivities.

He told ESPN that the event was hosted at Oakley founder Jim Jannard’s house. Brown is sponsored by Oakley.

The event took place in the Trousdale section of Beverly Hills and was shut down about 7 p.m. In a video posted on Brown’s Instagram account, the NBA star could be seen arguing with a BHPD officer who was shutting the party down.

“The owner didn’t say we needed a permit,” Brown told the officer in the video. Brown claimed the event was not a party, but rather a panel on culture.

“300k down the drain,” Brown wrote in a post on X after the incident, tagging the Beverly Hills Police Department.

“An event permit had been applied for and denied by the City due to previous violations associated with events at the address,” BHPD said in a statement.

“Despite the fact that the permit was denied, organizers still chose to proceed with inviting hundreds of guests knowing that it was not allowed to occur,” the statement continued.

Brown plays for the Boston Celtics, a historic rival of the Los Angeles Lakers, but added that he was surprised at his treatment by the city of Beverly Hills.

“I feel like we’re being targeted right now,” he said in a video posted to Instagram.