Pondering big questions in Cosmology:
What We Know & What We Don’t Know?
Cosmology in the 21st Century:
Shedding New Light on Black Holes
-
- Active Topics
-
-
- by
Eli 5 hours ago Inaugural Lecture by Prof. Mukandala: Dola, Soko na Kushindwa kwa Taasisi View the latest post Replies 2 Views 54
- by
Eli 1 day ago All in One: YouTube, TED, X, Facebook and Instagram Reels, Videos, Images and Text Posts View the latest post Replies 332 Views 41266
- by
Eli 1 day ago Iran's President Ebrahim Raisi Aged 63 Dies in a Helicopter Crash View the latest post Replies 3 Views 66
- by
Eli 1 day ago Re: What is in Your Mind? View the latest post Replies 717 Views 308046
- by
Eli 3 days ago PySpark for Large Data Processing View the latest post Replies 2 Views 8182
- by
Eli 3 days ago Online Bible View the latest post Replies 3 Views 23334
- by
Eli 4 days ago Generating SSH Key and Adding it to the ssh-agent for Authentication on GitHub View the latest post Replies 1 Views 513
- by
Eli 1 week ago Russia Invades Ukraine View the latest post Replies 663 Views 241956
- by
Eli 2 weeks ago President Museveni's Speech During International Development Association (IDA) Summit View the latest post Replies 1 Views 509
- by
Eli 2 weeks ago From Simple Linear Regression Analysis to Covariance & Correlation to Independent Determinant, and R-Squared View the latest post Replies 11 Views 25150
- by
-
Pondering Big Cosmology Questions Through Lectures and Dialogues
- Eli
- Senior Expert Member
- Reactions: 183
- Posts: 5412
- Joined: 9 years ago
- Location: Tanzania
- Has thanked: 75 times
- Been thanked: 88 times
- Contact:
In this one-hour public lecture, Josh Frieman, director of the Dark Energy Survey, presents an overview of our current knowledge of the universe and describes new experiments and observatories.
Forget what you think you know about dark matter. After a 30-year search for a single, as yet unidentified, species of dark matter particle that would make up some 25% of the mass of the universe, physicists are starting to consider novel explanations.
PI Public Lecture Series with a talk about the remarkable simplicity that underlies nature. Turok discusses how this simplicity at the largest and tiniest scales of the universe is pointing toward new avenues of physics research and could lead to revolutionary advances in technology.
Forget what you think you know about dark matter. After a 30-year search for a single, as yet unidentified, species of dark matter particle that would make up some 25% of the mass of the universe, physicists are starting to consider novel explanations.
PI Public Lecture Series with a talk about the remarkable simplicity that underlies nature. Turok discusses how this simplicity at the largest and tiniest scales of the universe is pointing toward new avenues of physics research and could lead to revolutionary advances in technology.
0
TSSFL -- A Creative Journey Towards Infinite Possibilities!
- Eli
- Senior Expert Member
- Reactions: 183
- Posts: 5412
- Joined: 9 years ago
- Location: Tanzania
- Has thanked: 75 times
- Been thanked: 88 times
- Contact:
CMB radiation is one of the most important discoveries in the 20th Century, it traces the origin of the Universe from its early very hot, dense epochs famously known as the Big-Bang.
0
TSSFL -- A Creative Journey Towards Infinite Possibilities!
- Eli
- Senior Expert Member
- Reactions: 183
- Posts: 5412
- Joined: 9 years ago
- Location: Tanzania
- Has thanked: 75 times
- Been thanked: 88 times
- Contact:
LSST DESC Seminar May 22, 2019 by Jo Dunkley from Princeton University - The Hubble constant, \(H_{0} \) Discrepancy: Evidence for New Physics?
0
TSSFL -- A Creative Journey Towards Infinite Possibilities!
- Eli
- Senior Expert Member
- Reactions: 183
- Posts: 5412
- Joined: 9 years ago
- Location: Tanzania
- Has thanked: 75 times
- Been thanked: 88 times
- Contact:
"Robert P. Kirshner, the Clowes Research Professor of Science in the Harvard Faculty of Arts and Sciences, set out to find the deceleration of the expansion of the universe, only to find something else: amazingly, the measurements showed the expansion of the universe to be speeding up. The astonishing (un)discovery of cosmic acceleration has now been confirmed from many directions—and attributed to a “dark energy” that dominates the universe, whose nature is a deep mystery at the heart of physics."
0
TSSFL -- A Creative Journey Towards Infinite Possibilities!
- Eli
- Senior Expert Member
- Reactions: 183
- Posts: 5412
- Joined: 9 years ago
- Location: Tanzania
- Has thanked: 75 times
- Been thanked: 88 times
- Contact:
"After matter decouples from the afterglow radiation of the Big Bang at z~150, the primordial gas cools adiabatically, becoming cooler than the cosmic microwave background (CMB). Atomic collisions are effective at coupling spin and gas temperatures while the universe is dense, leading to a 21 cm absorption signal at high-redshift. Collisional coupling becomes ineffective as the Universe expands, diluting the gas, and the spin temperature slowly re-equilibrates with the CMB. However, once the first stars form, they produce a background of UV photons that again couple spin and gas temperatures leading to a second absorption regime at z~20. After the first stars die, they leave behind compact objects, such as black holes and neutron stars that, through accretion, generate X-rays. Along with emission from early quasars and stars, these X-rays travel long distances depositing their energy as heat. This raises the IGM temperature (around z~15) and eventually leads to a 21 cm emission signal. As further galaxies form, ionizing radiation leads to large ionized bubbles that begin the process of reionization (z < 15). Ultimately, all neutral hydrogen in the diffuse IGM is ionized and the 21 cm signal ends (z~6)." Reference: EDGES Science
See also MIT news: http://news.mit.edu/2018/astronomers-de ... verse-0228
Cosmological scale
![Image](https://www.tssfl.com/download/file.php?mode=view&id=901)
Source: MIT Haystack Observatory, see also
EDGES
See also MIT news: http://news.mit.edu/2018/astronomers-de ... verse-0228
Cosmological scale
Source: MIT Haystack Observatory, see also
EDGES
- Attachments
-
- EoR.jpg
- Source: https://www.haystack.mit.edu/ast/science/epoch/index.html
- (75.65 KiB) Not downloaded yet
- EoR.jpg
- Source: https://www.haystack.mit.edu/ast/science/epoch/index.html
- (75.65 KiB) Not downloaded yet
0
TSSFL -- A Creative Journey Towards Infinite Possibilities!
-
- Information
-
Who is online
Users browsing this forum: No registered users and 6 guests