Profile

Cover photo
Roger Smith
Works at South East regional Health Authority
Attended University of the West Indies
Lives in kingston
658 followers|96,596 views
AboutPostsCollectionsPhotosVideos+1'sReviews

Stream

Roger Smith

Shared publicly  - 
 
DARPA .....shouuld have told tony stark.
Each year in Las Vegas, Defcon holds a contest called Capture the Flag. It's a hacking competition: you try to break into their system while they try to break into yours. Just like regular Capture...
1
Add a comment...

Roger Smith

Shared publicly  - 
 
Can't wait to hear the defenders of the holographic universe chime in
 
Foamy Evidence

Modern cosmology is dominated by two fundamental theories: general relativity, which describes the structure of space and time as manifold that interacts with mass/energy (aka gravity), and quantum theory, which describes the fundamental interactions of protons, electrons, light, etc. (aka quanta). Both models are strongly supported by experimental and observational evidence. The problem is that each theory makes fundamental assumptions about the way the universe works, and they contradict each other at a basic level. This isn’t a problem if you are interested in things on a large scale, such as planets and galaxies (general relativity), or things on a small scale such as nuclear fusion (quantum theory). The contradiction arises when you want to understand objects that are both very dense and interact at high energies, such as black hole interiors, the big bang, etc. So one of the challenges of modern cosmology is to develop a unified theory of quantum gravity, which would combine the predictions of general relativity and quantum theory in a consistent way.

There are lots of approaches to quantum gravity, including string theory and loop quantum gravity, that try to unify these two models, but one of the big challenges is that many of their predictions are difficult if not impossible to verify. But new observations of distant quasars has put some observational constraints on the type of unified model the universe might allow.

The research focuses on a property common to most unified theory approaches, known as quantum foam. The idea behind quantum foam is that at a fundamental level the quantum aspect of things dominates. This means that on a small enough scale, the precise nature of space and time itself breaks down into a nebulous flurry of quantum fluctuations or quantum foam. In this approach the structure of space and time we see around us is a macroscopic approximation arising out of this foam, just as a table appears solid when in fact it is a dynamic interaction of atoms and molecules. The scale at which the foamy nature of spacetime becomes evident is known as the Planck scale, which is about 10 billionths of the width of a proton. That’s far too small for us to probe directly.

But it turns out that this quantum foam (assuming it exists) should interact very slightly with light. Basically, a photon traveling through spacetime has a tiny chance of interacting with the quantum foam in such a way that its wavelength and direction could be changed. The chances of such an interaction is so small as to almost be zero, but over a billion light year journey it would have a measurable effect. Depending on the quantum foam modal, distant light could appear blurred at certain wavelengths so that our view of distant quasars would become too blurry to be observed.

Based upon observations of distant quasars, the team found no evidence of any quantum foam blurring. Given the constraints of their observations, this means that spacetime is completely smooth down to a scale of at least a thousandth of the width of a proton. This is actually precise enough to eliminate some quantum foam models. In particular, it eliminates one popular model known as the holographic model. As the authors point out, while the holographic model is a popular model relying upon the holographic principle, this research doesn’t invalidate the holographic principle itself.

So to the limits of observation, there is no evidence for a quantum foam. Whether it exists but has more subtle effects is something that will require further research.

Paper: E. S. Perlman et al. New Constraints on Quantum Gravity from X-ray and Gamma-Ray Observations. ApJ 805 10 doi:10.1088/0004-637X/805/1/10 (2015)
New observations of distant quasars find no evidence for quantum foam, and proves that the universe is not a hologram.
38 comments on original post
2
Roger Smith's profile photoG Anderson's profile photo
3 comments
 
Oh, I say we're in a Google simulacrum 200 years in our apparent future...
Add a comment...

Roger Smith

Shared publicly  - 
 
desert quick and dirty camp style in an iron skillet
1
Add a comment...

Roger Smith

Shared publicly  - 
 
Emulate all human functions in software and hardware. 
The eye is one of the most readily accessible organs to work with due to their relative simplicity and incredible importance to quality of life.
Scientists say they've created a device that restores near-normal sight in blind mice.
3
1
G Anderson's profile photo
 
Cool!

#science  
Add a comment...

Roger Smith

Shared publicly  - 
 
gonna try and make this 
3
Clover Ricketts's profile photo
 
Came home half hour ago, out of all day rain & 54 degrees and you're tempting me with junk food! ! 😀I don't even eat meat!! Looks good though.... Had soup & escovitched chicken, thank you!
Add a comment...

Roger Smith

Shared publicly  - 
 
Hameroff's google tech talk on the possibility of microtubules acting as mediators of consciousness. If he is correct consciousness is a quantum effect. Reality and consciousness would therefore be linked via common underlying architecture at the most fundamental level.
1
Add a comment...
In his circles
1,100 people
Have him in circles
658 people
Michael Grant's profile photo
Ministry of Youth and Culture's profile photo
Calista Karley's profile photo
Mokhtar Awwad's profile photo
Paul Podhorn, Jr.'s profile photo
ann steve's profile photo
Thomas Jäger's profile photo
Tami browning's profile photo
dinesh karnalu's profile photo

Roger Smith

Shared publicly  - 
 
 
Here's a video explaining wave-particle duality and its applications in the real-world using layman-friendly terms. If you have ever wanted to learn more about quantum mechanics, I hope this will provide a clear explanation. Also covered are atomic models, applications in chemistry, the Heisenberg Uncertainty Principle, and the de Broglie matter-wave equation.

References:

Atkins, P. & Friedman, R. (2005). Molecular quantum mechanics. Retrieved from http://www.kinetics.nsc.ru/chichinin/books/spectroscopy/Atkins05.pdf

Hawking, S. W. (2010). The grand design. New York: Random House, Inc.

Nave, R. (2014, Feb. 12). The uncertainty principle. Retrieved from http://hyperphysics.phy-astr.gsu.edu/hbase/uncer.html

Nguyen, D. (n.d.) Wave-particle duality. Retrieved from 
http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/09._The_Hydrogen_Atom/Atomic_Theory/Electrons_in_Atoms/Wave-Particle_Duality

Orzel, C. (2014, Sep. 15). Particles and waves: The central mystery of quantum mechanics.  Retrieved from http://ed.ted.com/lessons/particles-and-waves-the-central-mystery-of-quantum-mechanics-chad-orzel#discussion

Orzel, C. (2009, Sept. 9). Which way? Both ways: Particle-wave duality. In How to teach physics to your dog (1). Retrieved from http://dogphysics.com/Chapter_1_Sample.pdf.

Zheng, A. (2012). The evolution of atomic theory. Young Scientists Journal, 12. Retrieved from  http://www.butrousfoundation.com/ysj/wpcontent/uploads/Issue12/The-evolution-of-atomic-theory.pdf.
6 comments on original post
2
Add a comment...

Roger Smith

Shared publicly  - 
4
Clover Ricketts's profile photo
 
Nice but prefer Tostito spinach dip with white corn chips ❤
Add a comment...

Roger Smith

Shared publicly  - 
 
nara.me give them a try 
Nara Logics is creating AI for all the businesses and people who could benefit from access to an artificial brain but can't build it themselves.
2
Clover Ricketts's profile photoRoger Smith's profile photo
2 comments
 
Look l
Add a comment...

Roger Smith

Shared publicly  - 
 
The ability to directly manipulate an individuals consciousness by using sound waves may seem far fetched. However DARPA is actively researching this method as we speak.
2
1
G Anderson's profile photoM. Adams's profile photo
 
Doesn't sound far fetched to me. No pun intended.
Add a comment...

Roger Smith

Shared publicly  - 
 
Ubisoft's post-apocalyptic shooter and Bungie's sci-fi epic contain similar approaches to shared world multiplayer experiences--find out exactly how, here.
1
Add a comment...
Roger's Collections
People
In his circles
1,100 people
Have him in circles
658 people
Michael Grant's profile photo
Ministry of Youth and Culture's profile photo
Calista Karley's profile photo
Mokhtar Awwad's profile photo
Paul Podhorn, Jr.'s profile photo
ann steve's profile photo
Thomas Jäger's profile photo
Tami browning's profile photo
dinesh karnalu's profile photo
Education
  • University of the West Indies
    Natural Sciences, 1992 - 1993
  • University of the West Indies
    Medicine, 1993 - 1998
Basic Information
Gender
Male
Relationship
Married
Story
Tagline
Flow unending change unceasing unshackled from time I exhale the universe...
Work
Occupation
Consultant Physician Internist and Nephrologist
Employment
  • South East regional Health Authority
    Consultant Nephrologist, 2009 - present
  • University of the West Indies
    Consultant Nephrologist, 2004 - 2009
  • University of the West Indies
    Resident, 2000 - 2004
  • Southern Regional Health Authority
    Intern, 1998 - 2000
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
kingston
Previously
Jamaica
Roger Smith's +1's are the things they like, agree with, or want to recommend.
The first ever photograph of light as both a particle and wave
phys.org

(Phys.org)—Light behaves both as a particle and as a wave. Since the days of Einstein, scientists have been trying to directly observe both

Cooking in Your Cast Iron Skillet
www.southernliving.com

Use your nonstick pan all the time? Don't forget about the versatile cast iron. Here's why you should use it tonight.

Sintel
market.android.com

Sintel follows the story of a girl named Sintel searching for a baby dragon. © copyright Blender Foundation | www.sintel.org

Battlelog
market.android.com

Always stay connected to the battlefield with the Battlelog app for Android phones and tablets. It contains all the features you need to sta

Tell men who have sex with men the truth - In Focus - Jamaica Gleaner - ...
jamaica-gleaner.com

US NEWS and World Report of July 3, 2013, reported that if HIV continues to spread at current rates in the United States of America (USA)

SMPL White Theme Go/Nova/Apex
market.android.com

:: if you have problems with Go Launcher, Atom Launcher, or Power Toggles and are running jellybean. . . email me for the workaround apk, th

XS Usenet - Free Usenet provider
www.xsusenet.com

Warning: mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock&#39

Soldiers sentenced to more than 6,000 years in Guatemala massacre
www.msnbc.msn.com

A Guatemalan court has sentenced four former soldiers to more than 6,000 years in prison each for the 1982 massacre of 201 men, women and ch

Why Building the Death Star Is a Bad Investment
gizmodo.com

I wish to address the most important policy question of the millenium: should we build a Death Star? This debate picked up this year after s

Google Glass In Action: Video
www.techweekeurope.co.uk

Google has shown the world how it would feel to experience life while wearing the Google Glass headset, in a short video aptly named “How It

RIM BlackBerry Mini Keyboard
www.engadget.com

Like any good show pony, BlackBerry 10\'s been trotting around the world, strutting the fairly limited elements of its known UI in an effort

RIM BlackBerry OS 10
www.engadget.com

As Sony, Apple and others well know, it\'s hard to slip a phone into the marketplace without leaks, considering the many, many points on the

Galaxy Note 10.1 review of ‘embarrassing, lazy, arrogant money grab’ review
www.androidauthority.com

A review of the Galaxy Note 10.1 started making waves on the Internets for the highly critical points it makes about various aspects of the

ALL KIDNEY NEWS
www.allkidney.com

It has been suggested by researchers that the diuretic clorthalidone should be the first line of antihypertensive therapy with a few caveats

Sony's S1 tablet spotted in the wild, S2 captured briefly on video ...
www.engadget.com

We've already seen press shots and teaser videos of Sony's S1 Honeycomb tablet and dual-screen S2 (and had our eyes on them) but Ger

4G mobile vs broadband - Business - Jamaica Gleaner - Sunday | January 8...
jamaica-gleaner.com

The Editor, Sir:I write with reference to the article on the front page of the Financial Gleaner on Friday 6th January 2012 titled '4G goes

Nokia N9 first hands-on! (update: video) -- Engadget
www.engadget.com

The N9 has arrived. Functional units of Nokia's long-awaited MeeGo smartphone have finally landed into our eager hands and we've got

Also Home of Hargreave Hemo-Dialysis Unit Shops 5 and 6
Public - in the last week
reviewed in the last week
1 review
Map
Map
Map