The eruption you hear is either a Texas A&M celebration or a shift in national championship dominance out of the Southeast.

The Aggies’ 29-24 win over Alabama shocked Tuscaloosa and may prevent an SEC team from playing for the national title -- as long as Kansas State, Notre Dame and Oregon remain undefeated.

Louisville keeps rolling along as the Big East’s only undefeated team, but the rest of the conference has serious questions to answer in the final four Saturdays of the season.

Cincinnati and USF have new quarterback concerns due to ineffectiveness or injury. Pittsburgh and Syracuse must regroup after deflating losses. Rutgers is still looking for what went wrong in two-score loss at home to Kent State. And Temple and Connecticut are searching for anything to keep them competitive in the final weeks.

If Louisville is playing with a chip on its shoulder, Cardinals coach Charlie Strong has to be pleased with the results.

Louisville is the lowest ranked undefeated team at No. 11 in the Associated Press top 25, two spots behind a two-loss LSU. The other five undefeated teams -- Alabama, Oregon, Kansas State, Notre Dame and Ohio State -- are all in the top five.

College football’s weekend slate is highlighted by key games in the SEC (Alabama at LSU) and Pac-12 (Oregon at USC). Here’s a look a every game.

Friday

Momentum for previously undefeated Cincinnati and Rutgers has been sapped the last two weeks, but the Big East has other teams starting to get hot in recent weeks.

Syracuse has won back-to-back games for the first time this season, but a game at Cincinnati will give the Orange a chance to win three consecutive Big East games for the first time since 2001. And Pittsburgh has scored a rare win streak against FBS opponents. Extending it to three will be a tough task against undefeated Notre Dame.

Just two weeks ago, the Big East was basking in the glow of three teams undefeated in October.

That number is down to one. Barely.

The three-game round robin between Cincinnati, Louisville and Rutgers may still determine the Big East championship, but some of the luster is gone after the MAC bit the Big East again this season as Toledo upset previously undefeated Cincinnati last week.

The Big East race may still be between three teams, but the race lost its luster less than a week before one of the marquee games of the season for the league.

Thank Cincinnati for that.

The first half of the college football season provided plenty of twists and turns, but the second half is really when the national championship and the conference title races will be decided. With most teams finished with their non-conference games, the focus shifts to conference play, which is arguably the best stretch of the season. And the best news for college football fans? None of the six BCS conferences is decided, which means there are plenty of big games in the second half of the year.

Here’s the good news for the Big East for the second half of the season: The league has three nationally ranked, undefeated teams in Louisville, Rutgers and Cincinnati who will all face each other in the final month. For a conference struggling for national relevance, this round robin will be a breath of fresh air.