What the Many Worlds Theory Means in Physics

What the Many Worlds Theory Means in Physics The many worlds interpretation (MWI) is a theory within quantum physics intended to explain the fact that the universe contains some non-deterministic events, but the theory itself intends to be fully deterministic. In this interpretation, every time a random event takes place, the universe splits between the various options available. Each separate version of the universe contains a different outcome of that event. Instead of one continuous timeline, the universe under the many worlds interpretation looks more like a series of branches splitting off of a tree limb. For example, quantum theory indicates the probability that an individual atom of a radioactive element will decay, but there is no way to tell precisely when (within those ranges of probabilities) that decay will take place. If you had a bunch of atoms of radioactive elements that have a 50% chance of decaying within an hour, then in an hour 50% of those atoms would be decayed. But the theory tells nothing precisely about when a given atom will decay. According to traditional quantum theory (the Copenhagen interpretation), until the measurement is made for a given atom there is no way to tell whether it will have decayed or not. In fact, according to quantum physics, you have to treat the atomas if it is in a superposition of states - both decayed and not decayed. This culminates in the famous Schroedingers cat thought experiment, which shows the logical contradictions in trying to apply the Schroedinger wavefunction literally. The many worlds interpretation takes this result and applies it literally, the form of the Everett Postulate: Everett PostulateAll isolated systems evolve according to the Schroedinger equation If quantum theory indicates that the atom is both decayed and not decayed, then the many worlds interpretation concludes that there must exist two universes: one in which the particle decayed and one in which it did not. The universe therefore branches off each and every time that a quantum event takes place, creating an infinite number of quantum universes. In fact, the Everett postulate implies that the entire universe (being a single isolated system) continuously exists in a superposition of multiple states. There is no point where the wavefunction ever collapses within the universe, because that would imply that some portion of the universe doesnt follow the Schroedinger wavefunction. History of the Many Worlds Interpretation The many worlds interpretation was created by Hugh Everett III in 1956 in his doctoral thesis, The Theory of the Universal Wave Function. It was later popularized by the efforts of physicist Bryce DeWitt. In recent years, some of the most popular work has been by David Deutsch, who has applied the concepts from the many worlds interpretation as part of his theoretical in support of quantum computers. Though not all physicists agree with the many worlds interpretation, there have been informal, unscientific polls which have supported the idea that it is one of the dominant interpretations believed by physicists, likely ranking just behind the Copenhagen interpretation and decoherence. (See the introduction of this Max Tegmark paper for one example. Michael Nielsen wrote a 2004 blog post (at a website which no longer exists) which indicates - guardedly - that the many worlds interpretation is not only accepted by many physicists, but that it was also the most strongly disliked quantum physics interpretation. Opponents dont just disagree with it, they actively object to it on principle.) It is a very controversial approach, and most physicists who work in quantum physics seem to believe that spending time questioning the (essentially untestable) interpretations of quantum physics is a waste of time. Other Names for the Many Worlds Interpretation The many worlds interpretation has several other names, though work in the 1960s 1970s by Bryce DeWitt has made the many worlds name more popular. Some other names for the theory are relative state formulation or the theory of the universal wavefunction. Non-physicists will sometimes use the broader terms of multiverse, megaverse, or parallel universes when speaking of the many worlds interpretation. These theories usually include classes of physical concepts that cover more than just the types of parallel universes predicted by the many worlds interpretation. Many Worlds Interpretation Myths In science fiction, such parallel universes have provided the foundation for a number of great storylines, but the fact is that none of these have a strong basis in scientific fact for one very good reason: The many worlds interpretation does not, in any way, allow for communication between the parallel universes that it proposes. The universes, once split, are entirely distinct from each other. Again, science fiction authors have been very creative in coming up with ways around this, but I know of no solid scientific work that has shown how parallel universes could communicate with each other. Edited by Anne Marie Helmenstine

What to Expect From Beta Readers (And How to Find One)

What to Expect From Beta Readers (And How to Find One) What to Expect From Beta Readers And Where to Find Them In the software industry, programmers release â€Å"beta† versions of new programs that they get a select group of users to test. This way, any kinks can be worked out before it becomes available to the public.When it comes to publishing, the concept is the same, except the product being tested is a book, and the hopeful outcome is that potential negative reader reactions can be anticipated before publication. If authors are not sure which aspects of their book are working, this is a chance to find out.In this guide, we’ll give you pointers for finding beta readers and working with them in a way that’s constructive. But first, let’s clearly define what they are and what they do. What are beta readers?Beta readers review finished manuscripts before they're published, providing the author with feedback from the reader’s point of view.Beta readers can be friends or family members - anyone who will approach the book as a casual reader, pointing out things they liked and disliked, and highlighting the elements writers become blind to during countless revisions.A beta reader is the opposite of an alpha reader: the first person who reads and provides feedback on your manuscript, usually while it’s still a first draft.Beta readers also differ from critique partners, as the former reviews the book from the reader perspective, while the latter looks at a manuscript with a writer’s eye - paying close attention to any craft issues.Authors might also work with fact checkers at the final revision stage - especially if the author is writing about a culture or time period that is not their own, or if they are dealing with real life or sensitive topic s.Finally, a sensitivity reader is a type of beta reader - learn more about this controversial topic here.Beta readers do not replace editorsWhile beta readers are a form of quality control that authors can use before publishing their book, you should not rely on them to do the job of a professional editor. A professional editor will go through your book with a fine-tooth comb looking for plot holes, pacing or character development issues, grammatical errors or typos, and more - depending on the type of editor you hire.Typically, an author will: Take their manuscript through many rounds of self-editing. Then... When they are happy with it, they will submit it to a few beta readers. After†¦ They might have sensitivity readers look it over. Finally†¦ With as much of the revision work completed as possible, they will give it to an editor.This way, if you are self-funding a professional editor, the editor doesn’t need to waste their time - and your money - looking over issues you could have spotted yourself. They can focus on really fine-tuning your manuscript for publication. Do you know what beta and alpha readers are? Learn more here! Where can you find beta readers?Yes, you can turn to friends and family for beta reading. They’re probably the easiest people to access, and a good option for that reason alone. But, unless you happen to have brutally honest relatives, you’re best off also looking outside your inner circle to ensure the most honest and candid feedback. Here are a few places to start.Writing communitiesThese are ideal places to shop for beta readers, because they’ll get it. Other writers who are also in the process of finishing up their manuscript will likely also be looking for beta readers, and you can simply swap manuscripts and get the job done. Check out our blog post on 15 of the best online writing communities for aspiring authors.Your author websiteHave you set up a mailing list? In your newsletters, give people the option to sign up as a possible beta reader. In exchange, you can offer them a free copy of the final published title or an acknowledgment in your book.Goodrea dsThis bibliophile’s mecca is not just for readers, it’s also home to plenty of groups that support writers. Like this one, which is, luckily enough, aimed at connecting writers with beta readers.Local writing groupsFinding these can be as easy as typing â€Å"writer’s group † into Google. As a bonus, people are more likely to meet your deadlines when they have to see you face-to-face.Existing author connectionsYou might have connections with fellow authors, either via social media or from attending conferences/meet-ups. Don’t be shy: ask them nicely to help with beta reading. At worst, you’ll get a: â€Å"No, thanks† or â€Å"Maybe next time.† An extra tip here: don’t be pushy. A no is a no. Top reasons to work with beta and sensitivity readers How to work with beta readersNow that you’ve assembled a dream team of beta readers, it’s time to get them, well, reading. Here are a few tips to ensure that all parties get the most out of the experience.1. Look for someone with knowledge of your genre or subject matterWhile honesty is a key quality of a good beta reader, they should also already read and enjoy books similar to yours. Their familiarity with the genre can help them point out played-out tropes they feel have been overused, or key elements they feel are missing. Looking for readers who know your subject matter can also help ensure you handle delicate topics with sensitivity, and that there aren’t any glaring discrepancies or inaccuracies.2. But also look for people who don’t already read books like yoursUltimately, you should always write to market - in other words, if your book is young adult fantasy, you want to write a book that young adults who are into fantasy will enjoy. That being sa id, your feedback is likely to be most comprehensive if you show your manuscript to more than just existing Harry Potter fans. Are there any exposition dumps (places I over-inform the reader) you struggled to get through?ðŸÅ'Ž Worldbuilding Can you see the world clearly while reading? Can you see the action clearly while reading? Can you see the characters clearly while reading? Can you describe what the main characters look like?👠« Characters Was it clear who is talking? Does the dialogue sound natural and realistic? Does the character development feel natural? Are there any out-of-character moments? Do any of the characters feel cliche or stereotypical?📚 General Who is your favorite character and why? Who is your least favorite character and why? What’s your favorite part and why? Did you have a least favorite part? What is it and why?The more you tailor these questions to your book, the better. So instead of asking â€Å"Is there natural flow between the scenes,† look for specific scene cuts you’re not sure about and mention them specifically. We're discussing #sensitivityreaders - what they are and why they're important. Are you ready to start sending your manuscript to your pre-publication readers? Before you go, here are a few more additional resources to help you in these final stages of revisions. Novel Revision: Understanding the Craft Scene-by-Scene Editing for Authors Have you worked with a beta reader before? What has your experience been like? Leave your thoughts in the comments below!