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Description
CosmologyThis book is unique in the detailed, self contained, and comprehensive treatment that it gives to the ideas and formulas that are used and tested in modern cosmological research. It divides into two parts, each of which provides enough material for a one semester graduate course. The first part deals chiefly with the isotropic and homogeneous average universe; the second part concentrates on the departures from the average universe. Throughout the
This book is unique in the detailed, self-contained, and comprehensive treatment that it gives to the ideas and formulas that are used and tested in modern cosmological research. It divides into two parts, each of which provides enough material for a one-semester graduate course. The first part deals chiefly with the isotropic and homogeneous average universe; the second part concentrates on the departures from the average universe. Throughout the book the author presents detailed analytic calculations of cosmological phenomena, rather than just report results obtained elsewhere by numerical computation. The book is up to date, and gives detailed accounts of topics such as recombination, microwave background polarization, leptogenesis, gravitational lensing, structure formation, and multifield inflation, that are usually treated superficially if at all in treatises on cosmology. Copious references to current research literature are supplied. Appendices include a brief introduction to general relativity, and a detailed derivation of the Boltzmann equation for photons and neutrinos used in calculations of cosmological evolution. Also provided is an assortment of problems.Shipping Notes
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4.7 ★★★★★
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Product Reviews
★★★★★ 5
High quality duvet!
Size: Twin XL, Color: White, Size: Twin XL, Color: White
Extremely comfortable, soft, and thick duvet! It is also very light despite its thickness, and it makes all my comforters look super fluffy. It keeps me warm without making me sweat. It’s easy to wash, high quality, and it has 3 loops on all 4 sides of the comforter. You could also use this duvet by itself if you wanted to since it is so comfortable and looks like a white comforter on its own. Absolutely love this duvet and do recommend!
(I will add another photo of the duvet by itself when I take the duvet cover off to wash it)
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Super impressed for the price!
Size: Queen, Color: White
I didn’t have super high expectations ordering this, but it ended up being way better than I thought. It’s really soft and has that fluffy look without feeling super heavy. I was worried it would feel cheap or flat, but it actually holds its shape really well.
I’ve been using it for a bit now and it still looks good on my bed, not lumpy or uneven. It’s warm enough but not too hot, so I’ve been able to use it comfortably without waking up overheating.
I’ve also washed it and it didn’t fall apart or lose its fluff, which was a big thing for me. For the price, it honestly feels like something more expensive.
Only thing I’d say is if you like a super thick/heavy comforter, this one is more on the lightweight side, but I personally prefer that. Overall really happy with it and would buy again.
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Reviewed in the United States on April 7, 2026
★★★★★ 4
Incredible Comfortable
Size: Queen, Color: White
These Utopia queen sheets are extremely comfortable and have a soft, smooth feel that makes sleeping on them really enjoyable. The fabric feels lightweight but still cozy, and they fit the mattress well without slipping off or bunching up. They also wash easily and come out feeling fresh and soft, which makes them great for regular everyday use.
Overall, they’re a very comfortable, reliable sheet set that makes the bed feel clean, soft, and inviting every night while still being easy to care for.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
It’s cozy and fluffy without it being heavy or too warm.
Size: Queen, Color: White
I ordered this in the color white in the size queen and I have to say I do like it. My only worry was if it was going to be too warm and it is surprisingly very light and airy, but it still gives you that feeling of comfy, which is what I mainly wanted. Right now it is a little warmer throughout the night but every now and then where I live I tend to have to put another blanket on top of me when the weather drops at night, which is annoying however, with this, it provides enough warmth without it being so heavy on you.
I have to say for the price I can’t complain.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Great product
Size: King, Color: White
I absolutely love this king-size bedding! The material feels incredibly soft and comfortable, making it perfect for a great night’s sleep. It fits my king bed perfectly with plenty of coverage, and it stays in place without bunching up. The quality is excellent—it feels durable, well-made, and has held up nicely after washing without or shrinking.
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Reviewed in the United States on May 18, 2026
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